JP6370561B2 - Reinforced concrete structure wall - Google Patents

Description

  The present invention relates to a reinforced concrete (RC) structural wall used as a seismic wall or a load bearing wall, and relates to a technique for controlling the occurrence position of shrinkage cracks by the arrangement of wall bars.

  In concrete structures, cracks occur due to drying shrinkage that is difficult to avoid due to the properties of concrete and expansion and contraction of the structure. Cracks not only detract from the aesthetics of the structure, but also promote the neutralization of concrete and promote the corrosion of reinforcing bars, thereby reducing the durability of the structure. For this reason, in order to control the occurrence of cracks, it is generally performed that notches (induction joints) are provided on the concrete surface at intervals of 3 to 4 m, and the notches are filled with mortar after the structure is constructed.

  However, if the induction joint is only provided on the concrete surface, the crack generation position cannot be completely controlled, and cracks often occur in portions other than the induction joint. In view of this, various techniques have been proposed in which a cross-sectional defect material is embedded in the concrete in order to reliably generate cracks in the installation portion of the induction joint (see, for example, Patent Documents 1 to 5 and Non-Patent Document 1).

JP-A-11-229622 Japanese Patent No. 5002085 JP 2011-208356 A JP 2011-219920 A JP 2011-236539 A

"Development of crack control method for reinforced concrete bearing walls" by Ryoo Matsui et al. Summary of Annual Conference of Architectural Institute of Japan, September 2008, 1422 (p.843-844)

  However, in the case of controlling the crack occurrence position with the cross-sectional defect material embedded in the concrete as in the prior art, not only the cross-sectional defect material is required, but it takes time to install and fix the cross-sectional defect material, Care must be taken to prevent misalignment of the cross-section defect when placing concrete. For this reason, the material cost increases and the construction efficiency decreases, and quality control becomes difficult.

  In view of such a background, an object of the present invention is to provide a reinforced concrete structural wall that can control the crack generation position with easy management without using a cross-sectional defect material embedded in the concrete.

  In order to solve the above problems, the present invention comprises a plurality of vertical bars (13) and a plurality of horizontal bars (14, 24, 34, 44, 54, 64, 74, 84, 94) assembled in a lattice pattern. A reinforced concrete structural wall (10) having a wall reinforcement (11) and a wall concrete (12) around which the wall reinforcement is wound, wherein the wall extends so as to extend in the vertical direction at an intermediate portion in the longitudinal direction of the wall concrete. A right side portion (14R, 24R, 34R) having at least one pair of induction joints (15) formed on both sides of the concrete, and at least a part of the plurality of horizontal bars being divided in the length direction. 44R, 54R, 64R, 74R, 84R, 94R) and the left lateral portion (14L, 24L, 34L, 44L, 54L, 64L, 74L, 84L, 94L), The right side of the horizontal line and the left side of the horizontal line form an overlapping portion having a length less than the fixing length (for example, 40d) set according to the horizontal line, or the right side of the horizontal line and the left side of the horizontal line Are arranged so as to form a dividing portion that is spaced apart in the length direction, the position (P1) that is the fixing length away from the left end of the right side of the horizontal stripe to the right, and the right side of the left side of the horizontal stripe to the left A weak adhesion section between the fixing distance and the position (P2) is an angle of 45 degrees from the left and right ends of each induction joint in the wall concrete to the left and right in the plan view with respect to the thickness direction of the wall concrete. When the area | region which spreads is made into the crack control area | region (18), at least one part of the said weak adhesion area is arrange | positioned at the overlapping part (18a) of the two said crack control area | regions corresponding to a pair of said induction joints. And

  In the weak adhesion section, the adhesive force of the horizontal bars to the wall concrete is reduced, and cracks are likely to occur. In addition, since cracks are generally considered to occur at an inclination angle of 45 degrees or less with respect to the thickness direction of the wall, cracks occurring in a crack control region in the range of 45 degrees from the induction joint to the left and right respectively, It is easy to reach induced joints that are cross-sectional defects. Therefore, according to this invention, it is possible to easily generate a crack in a portion where a pair of induction joints are formed without using a cross-sectional defect material embedded in the concrete. Moreover, since the crack occurrence position is controlled by the arrangement configuration of the horizontal bars, it is not necessary to pay attention at the time of placing the concrete if the bars are arranged properly, and quality control is easy.

  Further, in the above invention, the horizontal stripes are such that the right side of the horizontal stripe (64R, 74R, 84R, 94R) and the left side of the horizontal stripe (64L, 74L, 84L, 94L) have a length less than the fixing length. It includes a transverse line (64, 74, 84, 84) arranged so as to form an overlapping part, and at least a part of the overlapping part is arranged in an overlapping part of the two crack control regions. it can.

  Generally, the fixing length of the reinforcing bar is set to be equal to or shorter than the lap joint length. Therefore, by adopting such a configuration, the overlapping portion where the adhesive force of the horizontal bars to the wall concrete is the smallest is formed in the overlapping portion of the crack control region, and the crack occurs in the overlapping portion of the crack control region, and the induced joint is This is more likely to occur in the installation area.

  In the above invention, the overlapping portion of the horizontal stripes (64, 74, 84, 94) is disposed at a position overlapping the induction joint in a front view, and the length of the overlapping portion is equal to the diameter of the horizontal stripe. It can be set as the structure which is 10d or less when it is set as d.

  Generally, the fixing length of the wall bars is required to be about 20d (with hook) to 40d. Therefore, by adopting such a configuration, a section with extremely small adhesion force is formed in the overlapping portion of the crack control region compared to the portion other than the weakly bonding portion, and the crack is further within the overlapping portion of the crack control region. It tends to occur.

  Further, in the above invention, the right side of the horizontal muscle (74R, 84R, 94R) and the left side of the horizontal muscle (74L, 84L, 94L) are spaced apart in the vertical direction, the right side of the horizontal muscle and the horizontal muscle An inclination with respect to a horizontal line of a line segment that is arranged at a position where at least a part of the overlapping portion formed with the left portion overlaps the induction joint in a front view and connects the left end of the right side of the horizontal muscle and the right end of the left side of the horizontal muscle The angles (θ1, θ2) may be 45 degrees or more.

  According to this configuration, the crack generated in the weakly attached section is likely to be an uneven shape that connects the left end of the right side of the horizontal line and the right end of the left side of the horizontal line. Therefore, even if the reinforced concrete structural wall is divided into a horizontal bar right part and a horizontal bar left part by cracks, a vertical load is easily transmitted at the joint (cracked part). Thereby, compared with the case where a reinforced concrete structure wall is completely divided into right and left, a decline in seismic performance is suppressed. In some cases, cracks may occur through the center rather than the ends of the horizontal bars arranged so as to overlap the induction joints, but in this case, the ends of the horizontal bars that enter the wall concrete part divided by the cracks. The part functions as a dowel for transmitting a vertical load between the divided concrete wall parts.

  In the invention described above, at least one of the left end of the right side of the horizontal muscle (84R, 94R) and the right end of the left side of the horizontal muscle (84L, 94L) is disposed at a position overlapping the induction joint in a front view. It can be.

  According to this configuration, in a plan view, cracks are easily generated in a straight line so as to reach the pair of induction joints through the end portions of the transverse bars that are the changing points of the tensile strength. That is, the crack can be reliably generated by the installation portion of the induction joint.

  Moreover, in said invention, it can be set as the structure which the left end of the said horizontal muscle right part (94R) arrange | positioned so that it may overlap with the said induction joint by front view, or the right end of the said horizontal muscle left part (94L) curved.

  When cracks occur closer to the center than the ends of the divided horizontal bars, and when the horizontal bars become dowels, finger pressure is applied to the concrete around the dowels, so load transmission is performed over the entire concrete surface cracked unevenly It is considered that the proof stress against the vertical load transmitted at the cracked portion is lower than that of. Therefore, by adopting such a configuration, it is possible to suppress the occurrence of cracks closer to the center than the ends of the divided transverse bars, and because the load is transmitted across the cracked concrete surface, the seismic performance is reduced. It is suppressed.

  In the invention described above, in the transverse muscle, the transverse muscle right portion (14R, 24R, 34R, 44R, 54R) and the transverse muscle left portion (14L, 24L, 34L, 44L, 54L) form the divided portion. The horizontal stripes (14, 24, 34, 44, 54) arranged in this manner may be included, and at least a part of the dividing portion may be arranged in the overlapping portion of the two crack control regions.

  According to this configuration, since the tensile strength of the reinforced concrete structure wall is reduced in the divided portion, a crack is likely to occur so as to connect the divided portion and the pair of induction joints.

  In the above invention, the transverse muscle (14) is arranged such that a left end of the transverse muscle right portion (14R) is disposed on the right side of the induction joint in a front view, and a right end of the transverse muscle left portion (14L) in a front view. It can be set as the structure containing the horizontal stripe arrange | positioned at the left side of the said induction joint.

  According to this configuration, since the split portion of the horizontal stripe is arranged on a straight line connecting the pair of induction joints, cracks are more reliably generated at the induction joints.

  Further, in the above invention, the transverse muscle is such that one of the left end of the right side of the transverse muscle (24R, 34R, 54R) and the right end of the left side of the transverse muscle (24L, 34L, 54L) is the induction joint in a front view. Arranged at overlapping positions, the other of the right end of the right side of the transverse muscle (24R, 34R, 54R) and the right end of the left side of the transverse muscle (24L, 34L, 54L) is placed on the side of the induction joint in a front view. It can be set as the structure containing the horizontal line | wire (24, 34, 54).

  According to this configuration, since the end of the horizontal line that is the tensile strength change point is arranged on the straight line connecting the pair of induction joints, cracks are easily generated in a straight line connecting the pair of induction joints.

  In the above invention, the transverse muscle (34, 44, 54) is a first transverse muscle (34A) arranged so that a left end of the right portion (34R, 44R, 54R) of the transverse muscle overlaps the induction joint in a front view. , 44, 54A) and the second lateral muscle (34B, 44, 54B) arranged so that the right end of the left lateral muscle portion (34L, 44L, 54L) in the front view overlaps the induction joint. be able to.

  According to this configuration, cracks are easily generated so as to pass through the left end of the right side of the horizontal muscle and the right end of the left side of the horizontal muscle, which overlap with the induction joint in front view, and the wall thickness from these positions also on the surface of the wall concrete. It tends to appear at a pair of trigger joints in the position extended in the direction.

  In the above invention, the transverse muscle includes the first transverse muscle (54A) arranged so that at least a part of the right portion (54R) of the transverse muscle overlaps the induction joint in a front view, and the left transverse muscle in a front view. At least a part of the portion (54L) overlaps the induction joint, and the right end thereof includes a second lateral muscle (54B) disposed to the right of the left end of the right lateral portion (54R) of the first lateral muscle. It can be configured.

  According to this configuration, the cracks can be easily generated along the induced joints, and the cracks are vertically moved by being arranged so that the right side of the first horizontal bar and the left side of the second horizontal bar are intricate. It tends to be uneven in the direction. Therefore, the vertical load transmitted on the crack surface is increased, and the deterioration of the seismic performance is suppressed.

  Moreover, in said invention, the said wall concrete is constructed | assembled simultaneously with the reinforced concrete member (2) to which at least one edge part of a length direction joins, In the edge part by the side of the said reinforced concrete member in the said wall concrete The pair of induction joints (15) is further included, and at least a part of the plurality of transverse bars (14) enters the reinforced concrete member with a length less than the fixing length, or of the reinforced concrete member. It can be set as the structure which has an edge part outside.

  According to this configuration, when the wall concrete is constructed simultaneously and integrally with the reinforced concrete member, it is possible to easily generate cracks along the induced joints at the joint portion between the reinforced concrete structural wall and the reinforced concrete member. .

  Moreover, in said invention, the said wall concrete is constructed | assembled so that it may join with the reinforced concrete member (2) constructed | assembled previously in at least one of the length direction, and the said some horizontal reinforcement (14) is the said reinforced concrete member. It can be set as the structure which has an edge part outside.

  According to this configuration, when the wall concrete is constructed so as to be joined with the previously constructed reinforced concrete member, it is easy to generate cracks along the joint at the joint between the reinforced concrete structural wall and the reinforced concrete member. can do. Moreover, since it is not necessary to install the joint reinforcing bar for a connection with a horizontal reinforcement in the reinforced concrete member constructed | assembled previously, construction is easy.

  In the above invention, the wall bars are arranged in two rows in the thickness direction of the wall concrete, and the transverse bars (54) arranged in one of the wall concrete thickness directions (first wall bars 11A). The overlapping portion or the dividing portion of the horizontal streak (54) arranged on the other side in the thickness direction of the wall concrete (second wall reinforcement 11B) is left and right in a front view. It can be set as the structure arrange | positioned by offset.

  According to this structure, even in a double reinforced concrete reinforced concrete wall with double reinforcement, it is easy to generate cracks so as to reach the induced joint through the weakly bonded portion where the adhesive force of the horizontal bars to the wall concrete is reduced. At the same time, the generated cracks can be easily made uneven in the thickness direction of the wall concrete.

  As described above, according to the present invention, it is possible to provide a reinforced concrete structural wall that can control a crack generation position with easy management without using a cross-sectional defect material embedded in the concrete.

(A) Front view showing outline of RC structure wall according to first embodiment, (B) Plan sectional view 1A is an enlarged view of the IIA portion, and FIG. 1B is an enlarged view of the IIB portion. (A) Explanatory drawing of tensile strength of RC structure wall shown in FIG. 1, (B) Main part plane sectional view Fig. 1 is a cross-sectional plan view of an essential part for explaining a crack control region of the RC structural wall shown in Fig. 1. Explanatory drawing of the seismic mechanism of the RC structural wall shown in Fig. 1 (A) Before crack occurrence (B) After crack occurrence (A) principal part front view of RC structure wall which concerns on 2nd Embodiment, (B) principal part plane sectional drawing (A) Explanatory drawing of tensile strength of RC structure wall which concerns on 2nd Embodiment, (B) Main part plane sectional drawing (A) principal part front view of RC structure wall which concerns on 3rd Embodiment, (B) principal part plane sectional drawing (A) Explanatory drawing of tensile strength of RC structure wall which concerns on 3rd Embodiment, (B) principal part plane sectional drawing (A) principal part front view of the RC structure wall which concerns on 4th Embodiment, (B) principal part plane sectional drawing, (C) explanatory drawing of tensile strength (A) principal part front view of the RC structure wall which concerns on 5th Embodiment, (B) principal part plane sectional drawing, (C) explanatory drawing of tensile strength (A) principal part front view of the RC structure wall which concerns on 6th Embodiment, (B) principal part plane sectional drawing, (C) explanatory drawing of tensile strength (A) principal part front view of RC structure wall which concerns on 7th Embodiment, (B) principal part plane sectional drawing Explanatory drawing of tensile strength of RC structure wall concerning a 7th embodiment Explanatory drawing of the principal part sectional drawing of the RC structure wall which concerns on 8th Embodiment, and a crack generation | occurrence | production aspect Sectional drawing of the principal part of RC structure wall concerning 9th Embodiment

  Hereinafter, a reinforced concrete structure wall according to the present invention will be described in detail with reference to some embodiments with reference to the drawings.

<< First Embodiment >>
First, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows (A) a front view and (B) a plan sectional view of a reinforced concrete structure wall (hereinafter referred to as RC structure wall 10). The RC structural wall 10 is applied to the multi-layer building 1 used as an office building or an apartment house. Here, the multi-layer building 1 is described as an RC ramen structure, but the multi-layer building 1 is not limited to an RC ramen structure, and may be an SRC structure, a wall-type structure, or the like.

  The RC structural wall 10 is constructed in a space surrounded by two pillars 2 adjacent to each other on the left and right and two beams 3 adjacent to each other on the upper and lower sides, and bears a horizontal load during an earthquake as will be described in detail later. Functions as a seismic wall. In the narrow sense, a seismic wall refers to a wall body that is designed to bear horizontal loads such as seismic force in structural calculations, but in a broad sense it is seismically resistant when a structure is subjected to seismic force. Refers to an effective wall. The RC structural wall 10 may be a seismic wall in a narrow sense designed as a seismic wall. It is designed as a load-bearing wall constructed for the purpose of resisting long-term vertical loads and can bear a horizontal load during an earthquake. The earthquake-resistant wall may be used.

  The RC structural wall 10 is composed of a wall reinforcement 11 and wall concrete 12 around which the wall reinforcement 11 is wound. The RC structure wall 10 has a double-bar type (double bar arrangement structure) in which the wall bars 11 are arranged in two rows in the thickness direction around the wall center. The wall bars 11 are arranged in a lattice pattern by a plurality of vertical bars 13 that are arranged at predetermined intervals in the left-right direction and extend vertically, and a plurality of horizontal bars 14 that are arranged at predetermined intervals in the vertical direction and extend horizontally. It is assembled. The vertical bars 13 and the horizontal bars 14 may be deformed steel bars that are widely used.

  The wall concrete 12 is constructed of on-site concrete. The concrete placement for constructing the wall concrete 12 may be performed at the same time as the pillar 2, and at the same time as the beam 3 and the slab 4 so as to be joined to the pillar 2 after the pillar 2 is constructed first. May be. When the pillar 2 is constructed first, the cotter 5 may be formed on the joint surface with the RC structure wall 10. Moreover, when the pillar 2 is constructed first, the pillar 2 is not limited to being hit on the spot, and may be constructed by installing a precast member.

  In FIG. 1, the floor 2, the beam 3, and the slab 4 (slab 4 as a ceiling) of the floor one layer below the floor on which the RC structural wall 10 is built are actually shown, and the floor on which the RC structural wall 10 is built. The column 2, the beam 3 and the slab 4 of FIG. This state can also be regarded as a state before the wall reinforcement 11 is assembled and before the wall concrete 12 is constructed (before the concrete is placed).

  The lower end of the vertical bar 13 is embedded in the beam 3 on the lower floor and is fixed to the beam 3. The vertical bars 13 have a length embedded in the beam 3 so that the upper end thereof is fixed to the beam 3 on the floor where the RC structural wall 10 is constructed. On the other hand, both the left and right ends of the horizontal stripe 14 are located outside the column 2 and are not embedded in the column 2 and are divided into three in the length direction. The divided horizontal stripes 14 have the same length of about 2 m to 3 m, respectively.

  In the middle portion of the wall concrete 12 in the left-right direction (length direction), two pairs of induction joints 15 arranged in pairs at opposite positions on both sides of the wall concrete 12 are formed so as to extend vertically. Yes. The two pairs of induction joints 15 are formed at intervals of 2 m to 3 m at positions that divide the length of the wall concrete 12 into three equal parts and that correspond to the division positions of the horizontal bars 14.

  Each induction joint 15 is formed as follows. That is, a joint rod is attached to the inner surface of a dam plate (not shown) that is disposed to oppose the concrete of the wall concrete 12 and the concrete struck between the dam plates is cured, so that the surface of the wall concrete 12 is cured. The induction joint 15 is formed as an open groove-shaped notch. The joint rod is usually tapered so that it can be easily removed from the hardened concrete from the inner surface side of the dam plate toward the projecting end side. Becomes a small trapezoid. After the construction of the wall concrete 12, the induction joint 15 is filled with a sealing material 15a such as mortar or resin.

  When the wall concrete 12 is constructed (concrete placement) at the same time as the pillar 2, the induction joint 15 may be provided at the joint end of the wall concrete 12 with the pillar 2. On the other hand, when the wall concrete 12 is constructed after the pillar 2 is constructed, the joint strength of the wall concrete 12 to the pillar 2 is relatively low, and the crack occurrence position is limited to the joint surface. It is not necessary to provide the induction joint 15 at the joint end. However, even in such a case, the induction joint 15 may be provided when it is necessary to install the sealing material 15a.

  Next, the structure around the installation portion of the induction joint 15 will be described with reference to FIG. 2A is an enlarged front view of the main part of the RC structure wall 10 showing the IIA portion in FIG. 1 in an enlarged manner, and FIG. 2B is an RC structure showing the IIB portion in FIG. 1 in an enlarged manner. It is a principal part plane sectional view of the wall 10, and is equivalent to the BB cross section in (A). Hereinafter, the wall reinforcement 11 arranged on the front side (lower side in the plane sectional view of (B)) in the front view of (A) is referred to as a first wall reinforcement 11A, and the back side (( The wall reinforcement 11 arranged on the upper side in the plan sectional view of B) is referred to as a second wall reinforcement 11B, and is simply referred to as the wall reinforcement 11 when it is not necessary to distinguish. Further, with the induction joint 15 as a reference, the divided horizontal stripe portion arranged on the right side is referred to as a horizontal stripe right portion 14R, and the divided horizontal stripe portion arranged on the left side is referred to as a horizontal stripe left portion 14L. Accordingly, the transverse muscle 14 arranged at the center in the left-right direction in FIG. 1 becomes the transverse muscle left portion 14L for the right induction joint 15 and the transverse muscle right portion 14R for the left induction joint 15. In addition, the sealing material 15a is abbreviate | omitted in the front view of (A).

  In the RC structure wall 10, the first wall reinforcement 11A and the second wall reinforcement 11B are the same reinforcement. Therefore, in this embodiment, both wall muscles 11A and 11B will be described as simply the wall muscles 11. The horizontal muscle right portion 14R and the horizontal muscle left portion 14L are arranged at the same height, and form a dividing portion in which the left end of the horizontal muscle right portion 14R and the right end of the horizontal muscle left portion 14L are spaced apart from the joint width of the induction joint 15. Are arranged to be. Here, the divided portion is a portion where the divided right side 14R and the left side 14L are separated, or even if the right side 14R and the left side 14L are in contact with each other, the continuous rebar is cut off. It means the part that is. The divided portion is a space immediately after the wall reinforcement 11 is assembled, and becomes a part of the wall concrete 12 after the concrete is placed. The pair of induction joints 15 are arranged in the center of the dividing portion in the length direction of the transverse muscle 14. That is, the left end of the right horizontal portion 14R is disposed on the right side of the induction joint 15 in front view, and the right end of the left lateral portion 14L is disposed on the left side of the induction joint 15 in front view.

  By configuring the RC structural wall 10 in this way, the crack generation position is controlled by the installation portion of the induction joint 15. Hereinafter, the control principle of the crack occurrence position will be described with reference to FIGS.

  FIG. 3B shows a plan cross-sectional view of the main part of the RC structural wall 10, and FIG. 3A shows the tensile strength of the wall concrete 12 with a broken line corresponding to FIG. The tensile strength (adhesive force to the wall concrete 12) is indicated by a solid line. Here, the tensile strength is the strength against the occurrence of cracks 16 in the wall concrete 12, and the lateral bars 14 can be considered to have the same or a constant relationship with the yield strength. Note that FIG. 3A does not show the tensile strength of the wall concrete 12 and the tensile strength of the horizontal bars 14 with a common vertical scale.

  Since the ratio of the wall reinforcement 11 in the cross section of the RC structural wall 10 is very small, if the change in the cross-sectional area due to the wall reinforcement 11 is ignored, the tensile strength of the wall concrete 12 is as shown in FIG. It is constant except that it becomes smaller at the portion where the induction joint 15 is formed. In addition, since the sealing material 15a packed in the induction joint 15 hardly contributes to the tensile strength, this is also ignored.

  However, the RC structure wall 10 has a thickness, and the crack 16 does not necessarily occur linearly along the thickness direction. In other words, even if the point or section where the tensile strength of the horizontal bar 14 is small is at a position different from the induction joint 15 in front view, it is considered that the crack 16 appears in the installation portion of the induction joint 15 on the surface of the wall concrete 12. More specifically, it is generally considered that the crack 16 is generated at an inclination angle of 45 degrees or less with respect to the thickness direction of the wall concrete 12. Therefore, as shown in the plan view of FIG. 4, in the wall concrete 12, both line segments that spread from the left and right ends of each induction joint 15 to the left and right in the plan view with respect to the thickness direction of the wall concrete 12 are respectively 45 degrees. It is considered that the crack 16 to be generated in the region sandwiched by 17 occurs so as to reach the induced joint 15 that is a cross-sectional defect.

  That is, the two regions sandwiched between the two line segments 17 can be considered as crack control regions 18 that can guide the cracks 16 generated in the wall concrete 12 to the corresponding induction joints 15. Therefore, if a relatively weak portion is set in the overlapping portion 18 a of the two crack control regions 18, the occurrence of the crack 16 on the surface of the wall concrete 12 other than the induction joint 15 is suppressed.

Returning to FIG. 3, the tensile strength in each cross section of the horizontal bar 14 is determined by the yield strength of the horizontal bar 14 in the case of the original one, but in the vicinity of the end, the wall concrete of the horizontal bar 14 on the end side from the cross section. 12, that is, the length from the cross section to the end of the transverse bar 14. Therefore, the tensile strength of the horizontal bar 14 is 0 at the end of the horizontal bar 14, and increases in proportion to the distance from the end. The inclination at this time varies depending on the design standard strength of the wall concrete 12, the diameter and the outer shape of the horizontal bars 14, and becomes constant when the adhesive force reaches the yield strength of the horizontal bars 14. In addition, the reinforced concrete bar arrangement guideline and explanation published by the Architectural Institute of Japan stipulates the lower limit of the fixed length of deformed reinforcing bars as shown in Table 1. However, d is a numerical value used for the name of the deformed reinforcing bar.

  For example, in a combination of concrete with a design standard strength of 18 N / mm 2, SD295A, and a deformed reinforcing bar without a hook, the reinforcing bar is fixed if it is 40 d or more. That is, if the distance from the end of the deformed reinforcing bar is 40d or more, the adhesive force is considered to be greater than the yield point strength. Actually, it is considered that the adhesive force reaches the yield point strength at 40 d or less. However, if the adhesive force increases in proportion to the distance from the end from 40 d to the end, the tensile strength of the horizontal bar 14 is As shown in FIG. 3 (A), it is assumed that the line increases linearly from the left end of the transverse muscle right part 14R to the right and from the right end of the transverse muscle left part 14L to the left to 40d, and becomes constant after 40d. Can do.

  Therefore, the fixing length (for example, 40d) leftward from the right end of the horizontal stripe left portion 14L and the position P1 that is separated from the left end of the horizontal stripe right portion 14R by the fixed length (for example, 40d) set according to the horizontal stripe 14 to the right. ) Is a weak adhesion section where the adhesion force of the horizontal bars 14 to the wall concrete 12 is weaker than the other portions.

  The total value of the tensile strength of the wall concrete 12 and the tensile strength of the transverse bars 14 is the tensile strength of the RC structural wall 10. In the present embodiment, the tensile strength of the RC structural wall 10 is the smallest in the portion where the induction joint 15 is formed, the second smallest in the divided portion, and increases in the weak adhesion section as the distance from the divided portion increases. It is constant at the largest value outside the weak adhesion section.

  As described in the background art, the crack 16 is mainly generated by drying shrinkage of the wall concrete 12 or expansion / shrinkage of the RC structural wall 10 and is likely to occur at a place where the total tensile strength of the wall concrete 12 and the transverse bars 14 is small. In the present embodiment, the dividing portion where the tensile strength of the horizontal bar 14 is the smallest is arranged at a position overlapping the induction joint 15 in front view, that is, in the overlapping portion 18 a of the two crack control regions 18 defined by the two induction joints 15. As a result, the crack 16 is easily generated so as to pass through the split portion of the transverse bar 14 and the pair of induction joints 15 without embedding a cross-sectional defect material inside the wall concrete 12. Thereby, it is suppressed that the crack 16 generate | occur | produces on the surface of the wall concrete 12 other than the induction joint 15. Moreover, since the crack generation position can be controlled by the arrangement configuration of the horizontal bars 14, it is not necessary to pay attention to the misalignment of the cross-sectional defect material when placing the concrete in the wall 12 as long as the bar arrangement is properly performed, and quality control is easy. is there.

  In this embodiment, since the dividing portion is formed at a position overlapping the induction joint 15 in front view, the crack 16 is likely to occur so as to pass through the division portion and the pair of induction joints 15, but at least in the weak adhesion section If a part is arrange | positioned at the overlapping part 18a of both the crack control area | regions 18, compared with the case where a weak adhesion area is not arrange | positioned at the overlapping part 18a, the crack 16 tends to appear in a pair of induction joint 15.

  In the present embodiment, the description has been given on the assumption that all of the fifteen horizontal stripes 14 arranged in the vertical direction are divided into three in the length direction. However, some are not divided, and some are divided into two ( The division position may be a position corresponding to the two division position of the horizontal stripe 14 divided into three). However, as described above, the divided horizontal streaks 14 are used to control the position where cracks are generated, and the greater the number of the horizontal streaks 14, the more the vertical bars 14 are not separated in the vertical direction. ), The control accuracy of the crack occurrence position becomes higher. Therefore, the horizontal stripes 14 to be divided are as many as possible, preferably more than half (in this embodiment, 15 half is 7 and 9 is more than 8). More preferably, the number is 70% or more, and even more preferably, the number is 85% or more.

  In this embodiment, as described above, the pillar 2 can be constructed first, and the RC structural wall 10 can be constructed later. Therefore, the construction work of the RC structural wall 10 can be removed from the critical path of the entire process, and the construction period can be shortened. In this way, when the column 2 is constructed first, the left end and the right end of all the horizontal stripes 14 may be positioned outside the column 2 as shown in FIG. By arranging the horizontal stripes 14 in this way, cracks 16 are likely to occur at the joint between the RC structure wall 10 and the column 2. Moreover, since it is not necessary to install the joint reinforcement for connection with the horizontal reinforcement 14 in the pillar 2 constructed | assembled previously, construction is easy.

  On the other hand, when the wall concrete 12 is constructed at the same time as the pillar 2, at least a part of the plurality of transverse stripes 14 has the ends of the transverse stripes 14 extending outside the pillar 2 or having a length less than the fixing length. What is necessary is just to arrange | position to the position which approachs, and the edge part of the remaining horizontal stripe 14 may be arrange | positioned inside the pillar 2. FIG. By arranging the horizontal stripes 14 in this way, cracks 16 are likely to occur along the induction joint 15 also at the joint between the RC structure wall 10 and the column 2.

  Next, the earthquake-resistant mechanism of the RC structural wall 10 according to the present embodiment will be described with reference to FIG. As shown in FIG. 5A, the earthquake resistance mechanism before the occurrence of cracking is shown, and FIG. 5B shows the earthquake resistance mechanism after the occurrence of cracking.

  Before the occurrence of a crack, as shown in (A), when the RC structural wall 10 is subjected to a seismic force applied to the multi-layer building 1 and this is applied as a horizontal load as indicated by a black arrow, it is One compression bundle 19 is formed throughout and functions as one earthquake-resistant wall. On the other hand, after the occurrence of a crack, as shown in (B), the RC structure wall 10 has an arch action because slippage occurs on the joint surface (crack surface) generated in the induction joint 15 and the vertical load cannot be transmitted. The three wall portions whose wall length contributes to 1/3 each form a compressed bundle 19 having a strength of one third, and function as three earthquake-resistant walls. Since the angle of inclination of the compressed bundle 19 after cracking with respect to the horizontal plane is larger than that of the compressed bundle 19 before cracking, the seismic performance of the RC structural wall 10 is reduced after cracking. The decrease in the earthquake resistance of the RC structural wall 10 may be suppressed by increasing the compression strength of each wall portion.

<< Second Embodiment >>
Next, a second embodiment of the present invention will be described with reference to FIGS. 6 is a diagram corresponding to FIG. 2 of the first embodiment, and FIG. 7 is a diagram corresponding to FIG. In addition, the figure corresponding to FIG.1, FIG.4, FIG.5 which does not have a big change in description is abbreviate | omitted. Further, members corresponding to those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted. However, in order to clarify the correspondence between the claims and the specification, the horizontal streaks are sufficient. Place a sign with different positions. The same applies to the third and subsequent embodiments.

  As shown in FIG. 6, also in the present embodiment, the first wall bars 11A and the second wall bars 11B have the same bar arrangement. On the other hand, in the present embodiment, the position of the dividing portion formed by separating the horizontal stripe right portion 24R and the horizontal stripe left portion 24L is different from that of the first embodiment. Specifically, the left end of the right side of the horizontal muscle 24R is arranged on the right side of the induction joint 15 in front view, and the right end of the left side of the horizontal muscle 24L is arranged at a position overlapping the induction joint 15 in front view.

  Therefore, as shown in FIG. 7, the tensile strength of the transverse bars 24 is the smallest in the portion where the induction joint 15 and the divided portion overlap, the second smallest in the portion where the induction joint 15 does not overlap in the divided portion, and the divided portion is As the distance from the left and right increases, the value increases within the weak adhesion section, and is constant at the largest value outside the weak adhesion section. Since the right end of the left horizontal portion 24L that is the tensile strength change point is arranged on a straight line connecting the pair of induction joints 15, the crack 16 passes through the right end of the left lateral portion 24L and forms a pair of induction joints 15L. It tends to occur in a straight line connecting the two.

  Also in the present embodiment, a part of the divided portion where the tensile strength of the transverse muscle 24 is the smallest overlaps with the induction joint 15 in the front view, that is, the two crack control regions 18 defined by the two induction joints 15. It arrange | positions at the superimposition part 18a. As a result, cracks 16 are likely to be generated so as to pass through the split portions of the horizontal bars 24 and the pair of induction joints 15 without embedding a cross-sectional defect material inside the wall concrete 12.

«Third embodiment»
Next, a third embodiment of the present invention will be described with reference to FIGS. 8B1 shows a B1 cross section in FIG. 8A, and FIG. 8B2 shows a B2 cross section in FIG. 8A. As shown in FIG. 8, also in the present embodiment, the first wall bars 11A and the second wall bars 11B have the same bar arrangement. On the other hand, in the present embodiment, the arrangement of the horizontal stripes 34 is not the same in all stages (installation positions that are different in the vertical direction), but differs depending on the stage. Specifically, the left end of the horizontal muscle right portion 34R is arranged at a position overlapping the induction joint 15 in front view, and the right end of the horizontal muscle left portion 34L is arranged on the left side of the induction joint 15 in front view; The second lateral muscle 34B, in which the left end of the right lateral portion 34R of the horizontal muscle is disposed on the right side of the induction joint 15 in front view and the right end of the left portion 34L of the lateral muscle overlaps the induction joint 15 in front view, is the vertical direction. Are alternately arranged.

  Therefore, as shown in FIG. 9, the tensile strength of the first horizontal bar 34A appearing in the B1 cross section is as shown by a solid line in FIG. 9A, and the tensile strength of the second horizontal bar 34B appearing in the B2 cross section is as shown in FIG. As shown in FIG. The total tensile strength of the transverse bars 34 when the two cross sections are taken as one set is the sum of the tensile strength indicated by the solid line and the tensile strength indicated by the alternate long and short dash line. As indicated by the dotted line, it is the smallest at the center of the two divided portions and overlapping the induction joint 15 in front view.

  Furthermore, inside the wall concrete 12, when proceeding in the vertical direction, on the straight line connecting the pair of induction joints 15, the left end of the right horizontal portion 34R of the first horizontal bar 34A and the second horizontal bar 34B which become the change points of the tensile strength. Appear alternately with the right end of the horizontal stripe left portion 34L. Therefore, in the wall concrete 12, the wall concrete 12 is likely to occur so as to pass through the left end of the horizontal bar right portion 34 </ b> R and the right end of the horizontal bar left portion 34 </ b> L. That is, the crack 16 is less likely to be generated at a position away from the straight line connecting the pair of induction joints 15 in the range of the dividing portion, and thus is difficult to appear at a position off the induction joint 15 on the surface of the wall concrete 12.

<< Fourth Embodiment >>
Next, a fourth embodiment of the present invention will be described with reference to FIG. 10A is a front view of the main part of the RC structural wall 10 in FIG. 10A, and FIG. 10B is a plan sectional view of the main part, and FIG. 10C is an explanatory diagram of tensile strength. As shown to (A) and (B), in this embodiment, 11 A of 1st wall bars and the 2nd wall bar 11B are made into the same bar arrangement, and the arrangement | positioning of the horizontal bar | burr 44 is made the same in all the steps. . On the other hand, the horizontal stripe 44 is arranged at a position where the left end of the horizontal stripe right portion 44R and the right end of the horizontal stripe left portion 44L both overlap the induction joint 15 in a front view.

  The tensile strength of the horizontal bars 44 in the longitudinal section of the RC structural wall 10 is the smallest at the divided portions corresponding to the pair of induction joints 15 as shown in FIG. Further, at each stage, on the straight line connecting the pair of induction joints 15, the right end of the horizontal stripe left portion 44 </ b> L and the left end of the horizontal stripe right portion 44 </ b> R, which become the tensile strength change points, appear. For this reason, the cracks 16 are likely to occur in the divided portions overlapping the pair of induction joints 15, and more easily appear on the pair of induction joints 15 on the surface of the wall concrete 12.

«Fifth embodiment»
FIG. 11: has shown the (A) principal part front view of the RC structure wall 10 which concerns on 5th Embodiment of this invention, (B) principal part plane sectional drawing, (B1) is B1 cross section in (A). (B2) shows a B2 cross section in (A). In the present embodiment, the first wall bars 11A and the second wall bars 11B are different from each other. In addition, in both the first wall bars 11A and the second wall bars 11B, the arrangement of the horizontal bars 54 is not the same in all stages, but differs depending on the stages.

  Specifically, in the first wall muscle 11A, in order from the B1 cross section downward, the left end of the right lateral portion 54R overlaps with the induction joint 15 in front view, and the right end of the left lateral portion 54L induces in front view. The first lateral muscle 54A disposed on the left side of the joint 15 and the left end of the right lateral portion 54R are disposed on the right side of the induction joint 15 when viewed from the front, and the right end of the left lateral portion 54L of the lateral muscle overlaps the induction joint 15 when viewed from the front. The second lateral stripes 54B arranged at the positions are alternately arranged. On the other hand, in the second wall muscle 11B, the second lateral muscle 54B similar to the first wall muscle 11A and the first lateral muscle 54A similar to the first wall muscle 11A, in order from the B1 cross section downward, are the first wall muscle 11A. Are arranged alternately so that they appear in reverse. In both the first wall muscle 11A and the second wall muscle 11B, the right end of the left lateral portion 54L of the second lateral muscle 54B is disposed to the right of the left end of the right lateral portion 54R of the first lateral muscle 54A.

  In addition to the concept of the case where the tensile strength of the horizontal bar 54 differs depending on the step described with reference to FIG. 9, the fact that the horizontal bar 54 is significantly different between the near side and the far side may be considered in accordance with this. In addition, the total of the two horizontal streaks in two stages is as shown by a solid line in FIG. In addition, illustration of each streak is omitted. Referring to FIG. 9 for confirmation, the tensile strength of the first lateral streak 54A appearing in the B1 cross section and the first lateral streak 54A appearing in the B2 cross section is roughly shown by a solid line in FIG. The tensile strength of the second horizontal bar 54B appearing in the B1 cross section and the second horizontal bar 54B appearing in the B2 cross section are substantially indicated by a one-dot chain line in FIG.

  By arranging the horizontal streak 54 in this way, the crack 16 is likely to be generated along the induction joint 15 and is also likely to be uneven in the vertical direction and the width direction of the wall concrete 12 as illustrated. Therefore, the slip on the crack surface is suppressed, the transmitted vertical load is increased, and the deterioration of the seismic performance is suppressed. The first wall reinforcement 11A and the second wall reinforcement 11B may be the same reinforcement, and even in this case, the crack 16 tends to be uneven in the vertical direction.

<< Sixth Embodiment >>
FIG. 12: has shown the (A) principal part front view of the RC structure wall 10 which concerns on 6th Embodiment of this invention, (B) principal part plane sectional drawing, (C) Explanatory drawing of tensile strength. As shown in (A) and (B), in the present embodiment, the first wall reinforcement 11A and the second wall reinforcement 11B are the same reinforcement, and the arrangement of the lateral reinforcement 64 is the same in all stages. . On the other hand, in each lateral muscle 64, the left end of the lateral muscle right portion 64R is disposed on the left side of the induction joint 15 in front view, and the right end of the lateral muscle left portion 64L is disposed on the right side of the induction joint 15 in front view. The right portion 64R and the horizontal stripe left portion 64L form an overlapping portion having a length larger than the joint width of the induction joint 15 and less than the fixing length described above. That is, the overlapping portion is arranged at a position overlapping the induction joint 15 in front view. In the present embodiment, the horizontal stripe right portion 64R and the horizontal stripe left portion 64L are of the same type and the same name (diameter). For example, when the two diameters are different, The length is set to be shorter than the fixing length of the transverse side right portion 64R or the transverse side left portion 64L on the thin side.

The rebar anchoring length is generally shorter than the lap joint length of the same rebar, and the overlap is naturally shorter than the lap joint length. For example, in the reinforced concrete bar arrangement guideline / commentary published by the Architectural Institute of Japan mentioned above, the lower limit value of the lap joint length of deformed bars is defined as shown in Table 2. The lap joint length is set to 5 d longer than the above-described fixing length for all deformed reinforcing bars. In general, the lap joints are not provided in one place, but are shifted from each other in principle, and the lap joint lengths of reinforcing bars having different diameters are based on the smaller d. In other words, the overlapping portion referred to here is completely different from the reinforcing joint of the reinforcing bars.

  By arranging the horizontal bars 64 in such an arrangement, the tensile strength of the horizontal bars 64 (the adhesive strength of the horizontal bars 64 to the wall concrete 12) is as shown in (C). In (C), the solid line indicates the tensile strength of the right side portion 64R and the left side portion 64L, and the alternate long and short dash line indicates the tensile strength of the right side portion 64R and the tensile strength of the left side portion 64L of the overlap. It is the value added together. As described above, the tensile strength of the horizontal streak 64 is constant at the smallest value in the overlapping portion, increases in the weakly attaching section as it moves left and right from the overlapping portion, and becomes constant at the largest value outside the weakly attaching portion.

  The total value of the tensile strength of the wall concrete 12 and the tensile strength of the transverse bars 64 is the tensile strength of the RC structural wall 10. In the present embodiment, since the overlapping portion is arranged at a position overlapping the induction joint 15 in front view, the tensile strength of the RC structural wall 10 is the smallest in the portion where the induction joint 15 is formed. Thereby, the crack generation position is controlled by the installation part of the induction joint 15.

  In addition, when at least a part of the overlapping portion is arranged in the overlapping portion 18a of the two crack control regions 18 described above, a section where the adhesive force of the horizontal bars 64 to the wall concrete 12 is the smallest is the overlapping of the crack control region 18. Formed in the portion 18 a, the crack 16 is more likely to occur in the overlapping portion 18 a of the crack control region 18 and the installation portion of the induction joint 15.

  Further, the longer the length of the overlapping portion, the greater the tensile strength of the horizontal stripes 64 in the overlapping portion. That is, as the length of the overlapping portion is shorter, the control accuracy of the crack occurrence position is higher. Therefore, the length of the overlapping portion is preferably not more than half of the fixing length (in the relationship with Table 1, 10d (with hook) to 20d or less), more preferably 10d or less. As a result, a section having an extremely small tensile strength compared to the portion other than the weak adhesion section is formed in the overlapping portion 18a of the crack control region 18, and the crack 16 is more likely to occur in the overlapping portion 18a of the crack control region 18. .

<< Seventh Embodiment >>
FIG. 13: (A) principal part front view of the RC structure wall 10 which concerns on 7th Embodiment of this invention, (B) principal part plane sectional drawing, FIG. 14 is explanatory drawing of the (A) tensile strength (B) The principal part plane sectional drawing is shown. As shown in FIGS. 13A and 13B, in the present embodiment, the first and second wall bars 11A and 11B are the same, and the arrangement of the horizontal bars 74 is the same in all stages. ing. On the other hand, in the horizontal stripes 74 of each stage, the horizontal stripe right portion 74R and the horizontal stripe left portion 74L are arranged with an interval in the vertical direction. Specifically, the horizontal stripe right portion 74R is arranged at an intermediate position (in the present embodiment, the center height) of the two-step horizontal stripe left portion 74L. Accordingly, the inclination angle θ1 with respect to the horizontal line drawn from the left end of the horizontal stripe right portion 74R to the right end of the horizontal stripe left portion 74L on the half step, and the right end of the horizontal stripe left portion 74L to the left end of the horizontal stripe right portion 74R on the half step. The inclination angle θ2 with respect to the horizontal line drawn is the same size. These inclination angles θ1 and θ2 are set to 45 ° or more, and the overlapping portion is set to 10d or less. Further, the left end of the horizontal stripe right portion 74R and the right end of the horizontal stripe left portion 74L are both arranged in the overlapping portion 18a of the crack control region 18.

  The tensile strength of the pair of transverse muscle right part 74R and transverse muscle left part 74L thus arranged with a space in the vertical direction is as shown by a solid line in FIG. 14 (A), and is the overlapping part as in the sixth embodiment. The total tensile strength of the horizontal stripe right portion 64R and the horizontal stripe left portion 64L is constant at the smallest value as shown by the alternate long and short dash line.

  Therefore, the crack 16 generated in the weak adhesion section is easily generated along the pair of induction joints 15 on the surface of the wall concrete 12, while the right end of the left horizontal portion 74 </ b> L of the horizontal bars is maintained inside the wall concrete 12. And the left end of the horizontal stripe right portion 74R alternately (see FIG. 15A), it tends to be uneven in the vertical direction in the range of the overlapping portion. Thereby, the vertical load transmitted by suppressing the slip on the crack surface is increased, and the deterioration of the seismic performance is suppressed.

  However, the crack 16 is considered to be complicated due to the influence of the coarse aggregate inside the wall concrete, and passes through the left side from the right end of the horizontal bar left portion 74L and the right side from the left end of the horizontal bar right portion 74R. (See FIG. 15B). In such a case, the end of the horizontal bar 74 that enters the wall concrete 12 portion divided by the crack 16 functions as a dowel for transmitting a vertical load between the divided wall concrete 12. Therefore, the slip on the crack surface is suppressed, and the transmitted vertical load remains the same. The same can be said in other embodiments that the end portion of the horizontal bar 74 that enters the wall concrete 12 portion functions as a dowel.

<< Eighth Embodiment >>
FIGS. 15A and 15B are both a cross-sectional view of an essential part of an RC structure wall 10 according to an eighth embodiment of the present invention and an explanatory view of a mode of occurrence of a crack 16. In the present embodiment, the left end of the horizontal stripe right portion 84R and the right end of the horizontal stripe left portion 84L that are spaced apart in the vertical direction are arranged at positions that overlap the induction joint 15 in a front view. That is, the overlapping portion is located inside the induction joint 15 in front view. The length of the overlapping portion is naturally 10d or less, and the inclination angle θ1 with respect to the horizontal line drawn from the left end of the horizontal stripe right portion 74R to the right end of the horizontal stripe left portion 74L on the half stage, and from the right end of the horizontal stripe left portion 74L The inclination angle θ2 with respect to the horizontal line drawn to the left end of the horizontal stripe right portion 74R on the half stage is the same size of 45 degrees or more.

  By arranging the horizontal streak 84 in this way, as shown in FIG. 9A, the horizontal streak becomes a point of change in tensile strength in plan view while maintaining the state in which the crack 16 tends to be uneven in the vertical direction. The cracks 16 that pass through the ends of 84 tend to be generated in a straight line so as to reach the pair of induction joints 15. That is, the crack 16 can be reliably generated by the installation portion of the induction joint 15. Also in this embodiment, as shown in (B), it is conceivable that the crack 16 passes to the left of the right end of the horizontal stripe left portion 74L and to the right of the left end of the horizontal stripe right portion 74R. The ends of the horizontal bars 74 that enter the wall concrete 12 divided in this way function as dowels that transmit a vertical load between the divided wall concrete 12, so that slip on the crack surface is suppressed.

  Note that only one of the left end of the right lateral portion 84R and the right end of the left lateral portion 84L is disposed at a position overlapping the induction joint 15 in front view, and the other does not overlap the induction joint 15 through the induction joint 15 in front view. It may be arranged in a position. Even with such an arrangement, cracks 16 are likely to occur so as to reach a pair of induction joints 15 as in the eighth embodiment.

<< Ninth embodiment >>
FIG. 16: is principal part sectional drawing of RC structure wall 10 which concerns on 9th Embodiment of this invention. In the present embodiment, both the left end of the horizontal stripe right portion 94R and the right end of the horizontal stripe left portion 94L are curved in the vertical direction to form a hook shape, and are arranged at positions overlapping the induction joint 15 in a front view. . The shape of the end portion of the horizontal stripe 94 does not need to be a hook shape generally defined by a specification or the like, and may simply be curved with respect to the length direction. In the present embodiment, the left end of the horizontal stripe right portion 94R and the right end of the horizontal stripe left portion 94L are curved 90 degrees with respect to the length direction. In the case of a normal hook, the hook is not included in the fixing length. However, in the present specification, the left end of the curved transverse right portion 94R or the right end of the transverse left portion 94L refers to an end portion in the actual length direction. When the weak adhesion section is determined for the horizontal stripe 94 whose end is curved, the actual end portion in the length direction of the horizontal stripe 94 becomes a reference.

  By configuring the horizontal stripe 94 in this way, the occurrence of the crack 16 closer to the center than the end of the divided horizontal stripe 94 is suppressed, and the crack 16 is surely connected to the right end of the horizontal stripe left portion 94L and the right side of the horizontal stripe. It is uneven in the vertical direction in the range of the overlapping portion so as to alternately pass through the left end of the portion 94R. Thereby, since the vertical load of the wall concrete 12 is transmitted in the whole crack surface, the fall of seismic performance is suppressed. That is, as described above, when the end of the horizontal bar left portion 94L or the horizontal bar right portion 94R enters the divided wall concrete 12 and functions as a dowel, finger pressure is applied to the wall concrete 12 around the dowel. Although the yield strength against the vertical load transmitted through the crack surface is relatively low, in this embodiment, the yield strength against the vertical load is higher than this, and the deterioration of the seismic performance is effectively suppressed.

  Although the description about specific embodiment is finished above, RC structure wall concerning the present invention is not limited to the above-mentioned embodiment. For example, in the above-described embodiment, the pair of induction joints 15 are arranged at positions facing each other. Even if the pair of induction joints 15 are shifted in the left-right direction, if they are less than 45 degrees with respect to the thickness direction of the wall concrete 12 in a plan view, the crack 16 is guided to the induction joint 15 and the two crack control regions 18. This is because the overlapping portion 18a also occurs. It is also possible to combine the above embodiments. In addition, the specific configuration, shape, arrangement, quantity, material, and the like of each member and part can be changed as appropriate without departing from the spirit of the present invention. On the other hand, all the elements shown in the above embodiment are not necessarily required, and may be appropriately selected.

2 Pillar (Reinforced concrete member)
10 RC structural wall (Reinforced concrete structural wall)
11 Wall reinforcement 11A 1st wall reinforcement 11B 2nd wall reinforcement 12 Wall concrete 13 Longitudinal reinforcement 14, 24, 34, 44, 54, 64, 74, 84, 94 Horizontal reinforcement 14L, 24L, 34L, 44L, 54L, 64L, 74L , 84L, 94L Transverse left part 14R, 24R, 34R, 44R, 54R, 64R, 74R, 84R, 94R Transverse right part 15 Induction joint 18 Control region 18a Overlapping part 34A, 54A First lateral muscle 34B, 54B Second lateral muscle P1, P2 Positions θ1 and θ2 that define the weak adhesion section Inclination angle with respect to the horizontal line of the line segment connecting the left end of the right side of the horizontal line and the right end of the left side of the horizontal line

Claims (13)

Reinforced concrete structural wall having wall bars composed of a plurality of vertical bars and a plurality of horizontal bars assembled in a lattice shape, and wall concrete around which the wall bars are wound,
Having at least one pair of induction joints formed on both sides of the wall concrete so as to extend in the vertical direction at an intermediate portion in the longitudinal direction of the wall concrete;
At least a part of the plurality of transverse muscles has a transverse muscle right portion and a transverse muscle left portion formed by being divided in the length direction, and the transverse muscle right portion and the transverse muscle left portion are set according to the transverse muscle. Arranged to form an overlapping portion having a length less than the fixing length, or to form a dividing portion in which the right side of the horizontal stripe and the left side of the horizontal stripe are separated in the length direction,
A weak adhesion section between a position away from the fixing length to the right from the left end of the right side of the lateral muscle and a position away from the fixing length to the left from the right end of the left side of the lateral muscle,
In the wall concrete, when a region extending at an angle of 45 degrees to the left and right in the plan view with respect to the thickness direction of the wall concrete from the left and right ends of each induction joint, as a crack control region,
At least a part of the weak adhesion section is disposed in an overlapping portion of the two crack control regions corresponding to the pair of induction joints,
The transverse stripe includes a transverse stripe arranged so that the right portion of the transverse stripe and the left portion of the transverse stripe form the overlapping portion having a length less than the fixing length, and at least a part of the overlapping portion includes two A reinforced concrete structure wall, which is disposed in an overlapping portion of the crack control region.   The overlapping portion of the transverse stripe is disposed at a position overlapping the induction joint in a front view, and the length of the overlapping portion is 10d or less when the diameter of the transverse stripe is d. The reinforced concrete structure wall according to 1. The horizontal stripe right part and the horizontal stripe left part are arranged at intervals in the vertical direction,
At least a part of the overlapping portion formed by the horizontal stripe right portion and the horizontal stripe left portion is arranged at a position overlapping the induction joint in a front view,
The reinforced concrete structure wall according to claim 1 or 2, wherein an inclination angle with respect to a horizontal line of a line segment connecting the left end of the right side of the horizontal bar and the right end of the left side of the horizontal bar is 45 degrees or more.   4. The apparatus according to claim 1, wherein at least one of a left end of the right side of the horizontal stripe and a right end of the left side of the horizontal stripe is arranged at a position overlapping the induction joint in a front view. 5. Reinforced concrete structural wall as described.   5. The reinforced concrete structural wall according to claim 4, wherein a left end of the right side of the horizontal bar or a right side of the left side of the horizontal bar arranged so as to overlap the induction joint in a front view is curved.   The transverse line includes a transverse line arranged so that the right part of the transverse line and the left part of the transverse line form the divided part, and at least a part of the divided part is arranged in an overlapping portion of the two crack control regions. The reinforced concrete structure wall according to claim 1, wherein the wall is a reinforced concrete structure wall.   The transverse muscle includes a transverse muscle in which a left end of the right portion of the transverse muscle is disposed on the right side of the induction joint in a front view, and a right end of the left portion of the transverse muscle is disposed on a left side of the induction joint in a front view. The reinforced concrete structure wall according to claim 6.   The transverse muscle is arranged such that one of the left end of the right side of the transverse muscle and the right end of the left side of the transverse muscle overlaps the induction joint in a front view, and the left end of the right side of the transverse muscle and the right end of the left side of the transverse muscle The reinforced concrete structure wall according to claim 6, wherein the other includes a transverse line arranged on a side of the induction joint in a front view.   The lateral muscles are arranged such that the left edge of the right side of the lateral muscles overlaps with the induction joint in front view, and the first lateral muscles arranged so that the right end of the left part of the lateral muscles overlaps with the induction joint in front view. The reinforced concrete structural wall according to claim 8, comprising two transverse bars.   The transverse muscles are arranged such that at least a part of the right side of the transverse muscle overlaps the induction joint in front view, and at least a part of the left part of the transverse muscle in front view overlaps the induction joint; and The right end includes a second lateral stripe arranged to the right of the left end of the right portion of the first transverse muscle, and the second transverse muscle is disposed on the right side of the first transverse muscle. Reinforced concrete structural wall as described. The wall concrete is constructed at the same time as a reinforced concrete column to which at least one end in the length direction is joined,
The wall concrete further includes the pair of induction joints at an end of the reinforced concrete column side,
Said plurality of at least a portion of the horizontal strip is claims 1, characterized in that it comprises an end portion outwardly of said fixing with a length less than the length enters the reinforced concrete column position, or the reinforced concrete column Item 11. The reinforced concrete structure wall according to any one of Items 10 . The wall concrete is constructed so as to be joined to a reinforced concrete column previously constructed in at least one of the length directions,
The reinforced concrete structure wall according to any one of claims 1 to 10, wherein the plurality of horizontal bars have end portions on the outside of the reinforced concrete columns. Reinforced concrete structural wall having wall bars composed of a plurality of vertical bars and a plurality of horizontal bars assembled in a lattice shape, and wall concrete around which the wall bars are wound,
Having at least one pair of induction joints formed on both sides of the wall concrete so as to extend in the vertical direction at an intermediate portion in the longitudinal direction of the wall concrete;
At least a part of the plurality of transverse muscles has a transverse muscle right portion and a transverse muscle left portion formed by being divided in the length direction, and the transverse muscle right portion and the transverse muscle left portion are set according to the transverse muscle. Arranged to form an overlapping portion having a length less than the fixing length, or to form a dividing portion in which the right side of the horizontal stripe and the left side of the horizontal stripe are separated in the length direction,
A weak adhesion section between a position away from the fixing length to the right from the left end of the right side of the lateral muscle and a position away from the fixing length to the left from the right end of the left side of the lateral muscle,
In the wall concrete, when a region extending at an angle of 45 degrees to the left and right in the plan view with respect to the thickness direction of the wall concrete from the left and right ends of each induction joint, as a crack control region,
At least a part of the weak adhesion section is disposed in an overlapping portion of the two crack control regions corresponding to the pair of induction joints,
The wall bars are arranged in two rows in the thickness direction of the wall concrete,
The overlapping portion or the dividing portion of the horizontal bars arranged on one side in the thickness direction of the wall concrete, and the overlapping portion or the dividing portion of the horizontal bars arranged on the other side in the thickness direction of the wall concrete. A reinforced concrete structural wall characterized by being arranged offset from side to side in a front view.

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