JP5939707B2 - Reinforcement structure for beam-column joints - Google Patents

Description

  The present invention relates to a reinforcing structure for a column-beam joint, which is mainly a reinforced concrete structure and reinforces a joint between a column and a beam on which a waist wall or the like is formed.

  Conventionally, there has been a case where the waist wall 20 is formed in the column beam joint portion by a predetermined length from the side surface 2 of the column 1. For example, in order to arrange fittings such as a window frame at a predetermined height, the lower wall of the lower frame of the window frame is a waist wall.

  In this case, the vertical bars 51 and the horizontal bars 52 are arranged in a lattice pattern in the waist wall 20 like a general wall, and the ends of the vertical bars 51 and 52 on the beam side are fixed in the beam 10. Thus, the column-side end of each lateral streak 52 was fixed in the column 1 (FIG. 9. Non-patent document 1, first conventional example).

  In this case, a so-called double bar arrangement in which two pairs of the vertical bars 51 and the horizontal bars 52 are arranged in the thickness of the waist wall 20 may be performed.

  Further, considering the function of the waist wall 20 as a member for placing a window frame or the like as described above, the waist wall 20 is generally often designed as a non-structure part. Therefore, it was designed mechanically separately from the joint of the column beam, and for example, a structural slit 53 was formed between the side surface 2 of the column 1 and the waist wall 20 (FIG. 10; Non-Patent Document 2, No. 2). Second conventional example).

  Further, in order to strengthen the bending strength of the beam-column joint, the oblique main bars 54 are arranged at the positions of the hypotenuses of the right triangle, and one end 54a of the diagonal main bars 54 is in the column 1 and the other end 54b is in the beam 10. It was fixed to. In this case, the concrete was added to the diagonal main reinforcing bars 54 to form a rectangular waist wall 20 (FIG. 11, Non-Patent Document 3, Third Conventional Example).

Architectural Institute of Japan, “Reinforcement Concrete Reinforcement Guideline and Explanation”, September 2001, pp.198-203 Ministry of Land, Infrastructure, Transport and Tourism, Housing Bureau Building Guidance Section, etc., “2007 edition of structural standards for building structural standards”, August 2007, p.661 Architectural Institute of Japan, “Reinforcement Concrete Reinforcement Guideline and Explanation”, September 2001, pp.32-33, pp.190-193

For the first conventional example, high deformation performance during an earthquake, the greater the damage to the spandrel wall 20 (cracks in the number and crack width), had the effective reinforcement of the beam-column joint. Further, in the case of the second conventional example, there was originally no reinforcement. In addition, although the third conventional example has a certain reinforcing effect, the processing and arrangement of reinforcing bars are complicated, and the design of the internal space is restricted. Furthermore, in order to prepare the upper surface 21 of the waist wall 20, it is necessary to extrude concrete afterwards, and there is a problem that the construction is generally troublesome.

  Therefore, when a load is applied to the conventional reinforcing structure and represented by a deformation-load graph, the first conventional example (B1), the second conventional example (B2), and the third conventional example (B3) are obtained. (FIG. 8).

  Therefore, in the present invention, the lumbar wall reinforcement is arranged on the lumbar wall, and the lumbar wall reinforcement is deformed, or the reinforcement reinforcing bar that surrounds the lumbar wall reinforcement and the beam reinforcement is arranged. Solved.

That is, the first invention is a column-beam joint part which is a joint part of a column beam of a concrete structure, and a waist wall-like structure is formed on the upper surface or the lower surface of the beam and is configured as follows. This is a reinforcing bar arrangement structure.
(1) In the waist wall structure, the length from the column side surface to the “length end surface” in the length direction of the beam is L _1, and the height direction of the column is measured from the upper surface or the lower surface of the beam. The height to the “height end face” is H ₁ and the width D ₁ is narrower than the beam width D ₀ .
(2) The beam has a beam stirrup arranged so as to surround the beam upper main bar and the beam lower main bar.
(3) The waist wall main reinforcement along the beam is arranged on the waist wall structure.
(4) the spandrel wall in the vicinity of the "length end face" of the main reinforcement, the spandrel main reinforcement and the spandrel substantially the to surround the beam lower main muscles located in the vertical direction "tip reinforcement" of main reinforcements distribution Make a streak.
(5) In addition to (4), or, instead of (4), near the spandrel wall in the vicinity of "length end face" of the main reinforcement, the beam bottom longitudinal reinforcement by bending toward the spandrel main reinforcement downward The “tip reinforcing bar” portion to be fixed to the head is formed.

Further, the second invention is a reinforcing structure for a beam-column joint, characterized in that a waist wall-like structure is formed on the upper or lower surface of the beam at the beam-beam joint, and is configured as follows. is there.
(1) In the waist wall structure, the length from the column side surface to the “length end surface” in the length direction of the beam is L _1, and the height direction of the column is measured from the upper surface or the lower surface of the beam. The height to the “height end face” is H ₁ and the width D ₁ is narrower than the beam width D ₀ .
(2) The beam has a beam stirrup arranged so as to surround the beam upper main bar and the beam lower main bar.
(3) The waist wall main reinforcement along the beam is arranged on the waist wall structure.
(4) located in the substantially vertical direction of the spandrel main reinforcement and the spandrel wall positioned substantially vertical main reinforcement reinforcing rebar surround "the beam upper main muscle portion" or the spandrel main reinforcement and the spandrel main reinforcement, reinforcing rebar surrounding the "portion of the beam bottom main muscles" which, one or both of a plurality Haisuji.

Further, the third invention is a beam-column joint part in which the waist wall-like structure is formed on the upper surface or the lower surface of the beam at the joint part of the column beam of the concrete structure, and is configured as follows. This is a reinforcing structure.
(1) In the waist wall structure, the length from the column side surface to the “length end surface” in the length direction of the beam is L _1, and the height direction of the column is measured from the upper surface or the lower surface of the beam. The height to the “height end face” is H ₁ and the width D ₁ is narrower than the beam width D ₀ .
(2) The beam has a beam stirrup arranged so as to surround the beam upper main bar and the beam lower main bar.
(3) The waist wall main reinforcement along the beam is arranged on the waist wall structure.
(4) the spandrel wall in the vicinity of the "length end face" of the main reinforcement, the spandrel main reinforcement and said spandrel main reinforcement substantially Haisuji vertical said to surround the beam lower main muscles located in the direction "tip Reinforcement" To do.
(5) in the length direction of the beam, between the side surface of the pillar and the "tip reinforcement", surround the beam upper main muscles located substantially vertically of the spandrel main reinforcement and the spandrel main reinforcement and "spandrel stirrups" and Haisuji substantially and vertically positioned to surround said beam lower main muscle "whole stirrups" in the spandrel main reinforcement and the spandrel main reinforcement.

  The third aspect of the invention is a reinforcing bar arrangement structure of column beam joints in which “lumbar stirrup” and “overall stirrup” are alternately arranged at equal intervals.

  Furthermore, in the first to third inventions, the reinforcing structure of the column beam joint in which the waist wall main bars are arranged only in the vicinity of the “height end surface” of the waist wall structure.

  The “waist wall-like structure” described above is a structure including both a waist wall formed on the upper surface side of the beam and a hanging wall formed on the lower surface side of the beam. In the above description, the “lumbar wall principal muscle along the beam” refers to the direction of the waist wall principal muscle, and the length direction of the beam (axial direction of the beam principal muscle) and the axial direction of the waist wall principal muscle substantially coincide with each other. It means that.

  At the joints between pillars and beams of a concrete structure, a waist-like structure was formed on the beam, and the waist wall main reinforcement and tip reinforcement bars were placed on the waist wall-like structure. In order to enable deformation in the vicinity of the tip end surface position of the beam, the span of the beam can be evaluated short in the structural plan, and there is an effect that high rigidity, proof stress and high deformation performance can be exhibited.

  Further, since the waist-like structure can be constructed in the normal construction flow of the joint, the column beam joint can be effectively reinforced by using a waist wall or the like with simple construction. Therefore, by forming the waist wall, the required performance can be maintained and the cross-sectional area of the beam can be set small, so that the work of penetrating the beam can be reduced during construction, and the internal space of the building can be reduced. There is an effect that can be used effectively.

FIG. 1 is a front view of an embodiment of the present invention. 2A is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 2B is a cross-sectional view taken along the line BB. FIGS. 3A and 3B are diagrams showing an effective cross section at the time of shear design, in which FIG. 3A shows an upper end tension and FIG. 3B shows an upper end compression. FIG. 4A is a conceptual diagram illustrating the amount of the tip reinforcing bar at the time of shear design, and FIG. 4B is a conceptual diagram illustrating the function of the tip reinforcing bar. 5A to 5C are longitudinal sectional views of other embodiments of the present invention. FIG. 6 is a cross-sectional view of another embodiment of the present invention. FIGS. 7A and 7B show another embodiment of the present invention and correspond to FIGS. 2A and 2B. FIG. 8 is a graph of deformation-load comparing the embodiment of the present invention and the conventional example. FIG. 9 is a first conventional example, and (a) and (b) are schematic longitudinal sectional views. FIG. 10 is a second conventional example, and (a) and (b) are schematic longitudinal sectional views. FIG. 11 is a third conventional example, and (a) and (b) are schematic longitudinal sectional views.

1. Reinforcement structure for beam-column joints

(1) In the column beam joint where the beam 10 is joined to the side surface 2 of the column 1, the upper main bars 14 of the beam 10 are six on the uppermost stages 14A and 14A and four on the lower side are the lowermost stages 14B and 14B. This is the so-called double bar arrangement. The lower end main reinforcement 15, six in the bottom 15 B, 15 B, a so-called double reinforcement of four at the top 15 A, 15 A is Haisuji on its upper side.

The beam 10 to be constructed is formed with a width D ₀ and a height H ₀ . In addition, the waist wall 20 scheduled to be built is
Width D ₁ (<D ₀ ),
Height (distance from the upper surface 11 of the beam 10 to the upper surface 21 of the waist wall 20) H ₁
(FIGS. 1 and 2A).

(2) In the same manner as in normal construction, column main bars (not shown) and beam main bars 14 and 15 are arranged, and column band bars (not shown) and beam ribs 16 and 16 are arranged. .

  In the vicinity of the upper surface 21 of the lumbar wall 20 to be constructed (below the distance about the cover thickness from the upper surface 21), the lumbar wall main bars 24, 24 are arranged laterally (parallel to the beam main bars 14, 15). . The waist wall main muscle 24 has a fixing plate 27 attached to one end 25 side, and one end 25 is necessary inside the distal end surface (length end surface) 22 of the waist wall 20 to be constructed with the fixing 27 plate attached. Reinforcement with the cover thickness secured. The other end 26 side of the waist wall main muscles 24, 24 is fixed in the column 1 (inside the column band muscle) (see FIG. 5C).

Tip reinforcing bars 31, 31 are provided between the uppermost waist wall main bars 24A, 24A (three) and the lower main bars 15B, 15B (three) of the lowermost beam 10 positioned substantially vertically below. Arrange the bars (Fig. 1). Assuming a structure in which the waist wall 20 and the beam 10 are united and the tip reinforcing bar 31 resists a shearing force generated inside by a truss mechanism (described later), a total of six windings are formed (multiple windings). Is desirable). Therefore, the entire waist wall main bars 24 and 24 and the “upper and lower main bars 14 and 15 of the beam 10” positioned substantially vertically below the waist wall main bars 24 and 24 are surrounded by the tip reinforcing bars 31 and 31. Is called. Therefore, the tip reinforcing bars 31 do not enclose the reinforcing bars of the portions that deviate from the waist wall 20 (width D ₁ ) even if they are the main bars 14A, 14B, 15A, 15B of the beam 10 located below the waist wall main bars 24A.

(3) Further, in the longitudinal direction of the waist wall main muscles 24, 24, between the side wall 2 of the column 1 to be constructed and the tip reinforcing bars 31, 31, the entire stirrup muscle 33 and the waist wall are alternately and equally spaced. The stirrup 35 is placed (FIG. 1).

The overall stirrup 33 has a width D ₁ between the uppermost waist wall principal muscles (three) 24A, 24A and the lower principal muscles 15B, 15B (three) of the lowermost beam 10 positioned below the upper muscles. The concrete is assumed to have a beam of “H ₀ + H ₁ ”, and the bar is arranged in a structure according to the specification of the shear reinforcement of the beam 10. Therefore, the lumbar muscles 24 and 24 and the “upper main bar 14 of the beam and the lower main bar 15 of the beam” positioned substantially vertically downward of the lumbar wall main muscle 24 are surrounded by the entire stirrup 33 (FIG. 2 ( a)). Therefore, even if the main ribs 33 are the main bars 14A, 14B, 15A, 15B of the beam 10 located below the waist wall main bars 24A, they do not enclose the reinforcing bars that are part of the waist wall 20 (width D ₁ ).

The waist wall stirrup 35 has a width between the uppermost waistline main bars 24A and 24A (three) and the upper main bars 14B (two) of the lowermost beam positioned substantially vertically below. D ₁ , because of the concrete of “H ₁ + H ₂ (the length from the upper surface 11 of the beam 10 to the upper main reinforcement 14B. FIGS. 1 and 2B)”, the shear reinforcement of the beam 10 Arrange the structure according to the specifications. Accordingly, the waist wall main muscle 24 and the “upper principal muscle 14 (14A, 14B)” of the waist wall main muscle 24, which are positioned substantially vertically and below, are surrounded by the waist wall rib muscle 35 (FIG. 2B). . Therefore, the waist wall ribs 35 do not surround the reinforcing bars of the portions that deviate from the waist wall 20 (width D ₁ ), even if they are the top main bars 14A, 14B of the beam 10 located below the waist wall main bars 24A.

  Further, the waist wall main muscles 24, 24 are also formed with the waist wall ribs 35 on the side where the fixing plate 27 is provided (the front end face 22 side) (FIG. 1). In this case, for example, a lumbar rib stirrup 35 is arranged near one end 25 of the lumbar main bar 24 that penetrates the fixing plate 27 (FIG. 1).

(4) A reinforcement structure is formed as described above. Because of the bar arrangement structure, the order of description does not necessarily match the order of construction.

In the above, the waist wall main bar 24 uses reinforcing bars (tensile strength, diameter, etc.) having the same performance as the beam main bars 14 and 15, and the overall rib bar 33 and the waist wall barr 35 are the beam barr 16. Reinforcing bars (tensile strength, diameter, etc.) with the same level of performance are used. In addition, the tip reinforcing bars 31 depend on the number, but generally, in terms of performance,
Overall stirrup muscle 33 (lumbar wall stirrup muscle 35) <tip reinforcing muscle 31 <lumbar wall principal muscle 24
Use the degree. However, the selection of the reinforcing bars is an example, and is appropriately selected and used so that the required performance can be realized.

(5) Before or after the bar arrangement, or at the same time, a necessary form having the same structure as that of the prior art is constructed, concrete is placed in the form, and the concrete is solidified. A structure 40 is constructed (FIGS. 1 and 2).

  In the above description, the upper main bar 14 and the lower main bar 15 of the beam 10 have been described with respect to the upper and lower two stages (so-called double bar arrangement). The present invention can also be applied to the case where the streak 14 and the bottom streak 15 are one-stage upper and lower (so-called single bar arrangement) (not shown).

2. Actual design and evaluation of beam-column joint reinforcement structure 40

(1) In the reinforcing structure 40 thus formed, when the waist wall 20 and the beam 10 behave integrally, and a tensile load acts on the upper surface 21 of the waist wall 20, the waist including the waist wall 20 is included. The beam 10 including the continuous beam 10 under the wall 20 is designed to be sheared as a wall beam, and the overall stirrup amount is determined (FIG. 3A).

  In addition, when a compressive force is applied to the upper surface 21 of the waist wall 20, a shear design is performed with an effective cross section surrounded by the waist wall 20 and upper principal bars 14, 14 of the beam 10 below the waist wall 20 (FIG. 3 ( b)).

  In the experiment, the entire stirrup 33 was set to a shear reinforcement ratio of 0.42% and the interval was set to 130 mm. In addition, the waist wall stirrup 35 has a shear reinforcement ratio of 0.68%, and the interval considering the whole stirrup 33 is 65 mm.

  That is, when the upper end is pulled, the total amount of the stirrup is calculated assuming that the concrete surrounded by the entire stirrup 33 is shear resistant (FIG. 3 (a)). The required amount of “lumbar stirrup and total stirrup” is calculated assuming that the range of concrete resists shear (Fig. 3 (b)).

(2) The tip reinforcing bars 31 and 31 have a ratio determined by the sum L ₂ (H ₁ + H ₀ ) of the height H ₁ of the waist wall 20 and the beam hose H ₀ and the length L ₃ of the plastic region. It is determined by the relationship with the load of the waist wall principal muscle 24 (the total of the waist wall principal muscles 24). That is, when the load _{T 1} of the tensile force _{T 2} and spandrel main reinforcement 24 of the front end reinforcement 31,
T ₁ : T ₂ = L ₁ : L ₂
(FIG. 4A).

(3) In the above structure, the waist wall main bars 24, 24 are arranged only at the upper end of the waist wall 20 (near the upper surface 21 of the waist wall 20), and the reinforcing bars are placed at positions away from the neutral axis of the waist wall 20. By concentrating, the bending strength of the waist wall 20 can be improved (FIGS. 1 to 6).
Further, the waist wall main muscles 24, 24 are arranged at least at the upper end portion of the waist wall 20, and in addition to the upper end portion of the waist wall 20, the waist wall principal muscles 24, 24 to the lower end portion and the middle portion of the waist wall 20 are provided. You can also arrange the bars. For example, depending on the required performance, the waist wall main muscles 24, 24 can be arranged in a substantially uniform manner in the height direction of the waist wall 20 (FIG. 7).

  The waist wall stirrup 35 mainly transmits the shearing force of the beam 10 to the column 1 when the bending stress of the upper end compression acts on the beam 10 (waist wall 20). Further, the waist wall stirrup 35 restrains the concrete of the waist wall 20, thereby improving the compressive toughness of the concrete and improving the deformation performance of the beam 10.

  Further, the entire stirrup 33 mainly transmits the shearing force of the beam 10 to the column 1 when the bending stress of the upper end tension acts on the beam 10 (waist wall 20). Further, the overall stirrup 33 prevents the waist wall 20 and the beam 10 from being structurally separated and prevents the so-called blinding 43 from occurring, and the reinforcement structure 40 including the column 1, the beam 10, and the waist wall 20. Unity can be maintained (FIG. 4B).

Further, in addition to the function of the overall stirrup 33, the tip reinforcing bar 31 suppresses the expansion of the crack width of the cracks 42 and 42 generated on the tip surface 22 of the waist wall 20 (FIG. 4B). Further, the waist wall main muscle 24 yields due to the upper end tension, and the plastic region of the waist wall 20 (the portion of the length L ₃ formed from the side surface 2 of the column 1 on the waist wall 20 side to the tip surface 22 side of the waist wall 20). ) Progresses (the lumbar wall reinforcement 24 adheres and deteriorates), and the truss mechanism is formed by the combination of the tip reinforcing bar 31 and the fixation of the lumbar wall reinforcement 24 and the compression of the concrete, thereby reinforcing the structure (column beam connection). Part) 40 toughness can be ensured (FIG. 4A).

To reliably yield the spandrel main reinforcement 24, when a load T ₁ of the spandrel main reinforcement 24 has reached the yield load T _1y, tip reinforcement 31 has a permissible tensile force T ₂ or more capabilities There is a need. The reaction force generated by T _1y and T ₂ is resisted by the compressive force C1 of the concrete. When T _1y : T ₂ = L ₁ : L ₂ , the concrete compressive force C 1 is lower rightward from the intersection of the waist wall main bar 24 and the tip reinforcing bar 31 toward the intersection of the pillar and the lower surface of the beam 10. (FIG. 4A).

3. Other embodiments

(1) In the said embodiment, although demonstrated on the side 2 side of the one side of the pillar 1 (FIG.5 (c)), when the beams 10 and 10 join to the both sides 2 and 2 of the pillar 1, (medium pillar) Is also applicable (FIGS. 5A and 5B). In this case, when the waist wall 20 is formed only on the beam 10 on the side surface 2 on one side, the other end 26 on the column 1 side of the waist wall main muscle 24 is provided with a fixing plate 27 on the other end 26 in the column 1. Fixing is performed (FIG. 5A). The bar arrangement of the beam 10 and the column 1 is the same as the conventional one.
When the beams 10 and 10 are joined to both sides of the column 1 (middle column) and the waist wall 20 is formed on the beams 10 on both sides, the waist wall main muscle 24 penetrates the column 1 and the waist wall. Similarly to the one end 25, the other end 26 of the main bar 24 is positioned inside the distal end surface (right end surface, length end surface) 22 of the waist wall 20 with a necessary cover thickness secured, and a fixing plate 27 is provided. Fixing is performed (FIG. 5B).

(2) Further, in the above-described embodiment, the waist wall main reinforcement 24 is formed horizontally, and the tip reinforcing bars 31 are arranged so as to be orthogonal thereto, but the waist wall reinforcement 24 and the tip reinforcement bars 31 are integrally formed. It can also be formed. That is, the front end surface 22 side of the waist wall 20 of the waist wall main muscles 24, 24 is bent downward to form the front end reinforcing bar portion 31, and the uppermost beam along the position where the front end reinforcing bar portion 31 is to be arranged. It is also possible to fix by bringing the tip to the 10 lower principal bars 15, 15 (FIG. 6). In this case, the lower end of the waist wall main bar 24 (the lower end of the tip reinforcing bar 31) is positioned below the uppermost lower bar main bar 15A of the beam 10.

(3) In the above-described embodiment, the waist wall 20 in which the height does not reach the lower surface of the upper beam 10 on the upper surface 21 of the beam 10 has been described, but the upper surface of the lower beam 10 on the lower surface 21 a of the beam 10. It is also possible to adopt a reinforcing structure similarly applied to a hanging wall that does not reach the height (not shown). Moreover, it can also be set as the reinforcement structure by which the waist wall 20 was formed in the upper surface 21 of the beam 20, and the hanging wall was formed in the lower surface 21a (not shown).

1 Column 2 Column Side 10 Beam 11 Beam Top 12 Beam Bottom 14 Beam Top Main Bar 14A Beam Top Main Bar (top)
14B Beam upper main bar (bottom)
15 Beam lower main bar 15A Beam lower main bar (top)
15B Beam bottom main bar (bottom level)
16 Lumbar muscle 20 Lumbar wall 21 Lumbar upper surface 22 Lumbar distal end surface 24 Lumbar principal muscle 24A Lumbar principal muscle (top)
25 One end 26 of the lumbar main muscle 26 Other end 27 of the lumbar main muscle Fixing plate 31 Tip reinforcement (tip reinforcement)
33 Overall stirrup 35 Lumbar stirrup 51 Longitudinal (conventional example)
52 Transverse (conventional example)
53 Structure slit (conventional example)
54 Oblique main muscle (conventional example)
54a, 54b End of oblique main muscle (conventional example)
55 Reinforcing bars (conventional example)

Claims (5)

A reinforcing bar arrangement structure for a beam-to-column joint characterized in that a waist wall-like structure is formed on the upper or lower surface of the beam at the joint between beam-to-columns of a concrete structure and is configured as follows.
(1) In the waist wall structure, the length from the column side surface to the “length end surface” in the length direction of the beam is L _1, and the height direction of the column is measured from the upper surface or the lower surface of the beam. The height to the “height end face” is H ₁ and the width D ₁ is narrower than the beam width D ₀ .
(2) The beam has a beam stirrup arranged so as to surround the beam upper main bar and the beam lower main bar.
(3) The waist wall main reinforcement along the beam is arranged on the waist wall structure.
(4) the spandrel wall in the vicinity of the "length end face" of the main reinforcement, the spandrel main reinforcement and the spandrel substantially the to surround the beam lower main muscles located in the vertical direction "tip reinforcement" of main reinforcements distribution Make a streak.
(5) In addition to (4), or, instead of (4), near the spandrel wall in the vicinity of "length end face" of the main reinforcement, the beam bottom longitudinal reinforcement by bending toward the spandrel main reinforcement downward The “tip reinforcing bar” portion to be fixed to the head is formed. A reinforcing structure for a beam-to-column joint, wherein a waist wall-like structure is formed on the upper or lower surface of the beam at the beam-to-column joint and is configured as follows.
(1) In the waist wall structure, the length from the column side surface to the “length end surface” in the length direction of the beam is L _1, and the height direction of the column is measured from the upper surface or the lower surface of the beam. The height to the “height end face” is H ₁ and the width D ₁ is narrower than the beam width D ₀ .
(2) The beam has a beam stirrup arranged so as to surround the beam upper main bar and the beam lower main bar.
(3) The waist wall main reinforcement along the beam is arranged on the waist wall structure.
(4) located in the substantially vertical direction of the spandrel main reinforcement and the spandrel wall positioned substantially vertical main reinforcement reinforcing rebar surround "the beam upper main muscle portion" or the spandrel main reinforcement and the spandrel main reinforcement, reinforcing rebar surrounding the "portion of the beam bottom main muscles" which, one or both of a plurality Haisuji. A reinforcing structure for a beam-to-column joint characterized in that a waist wall-like structure is formed on the upper or lower surface of a beam at the joint of a beam of a concrete structure and is configured as follows.
(1) In the waist wall structure, the length from the column side surface to the “length end surface” in the length direction of the beam is L _1, and the height direction of the column is measured from the upper surface or the lower surface of the beam. The height to the “height end face” is H ₁ and the width D ₁ is narrower than the beam width D ₀ .
(2) The beam has a beam stirrup arranged so as to surround the beam upper main bar and the beam lower main bar.
(3) The waist wall main reinforcement along the beam is arranged on the waist wall structure.
(4) the spandrel wall in the vicinity of the "length end face" of the main reinforcement, the spandrel main reinforcement and said spandrel main reinforcement substantially Haisuji vertical said to surround the beam lower main muscles located in the direction "tip Reinforcement" To do.
(5) in the length direction of the beam, between the side surface of the pillar and the "tip reinforcement", surround the beam upper main muscles located substantially vertically of the spandrel main reinforcement and the spandrel main reinforcement and "spandrel stirrups" and Haisuji substantially and vertically positioned to surround said beam lower main muscle "whole stirrups" in the spandrel main reinforcement and the spandrel main reinforcement. The reinforcing bar arrangement structure for a beam-column joint according to claim 3, wherein "lumbar rib stirrup" and "overall stirrup" are alternately arranged at equal intervals. The reinforcing structure for a beam-column joint according to any one of claims 1, 2, and 3, wherein the waist wall main reinforcing bars are arranged only in the vicinity of the "height end face" of the waist wall-like structure.

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