JP5591503B2 - Crush-inhibiting concrete column members - Google Patents

Description

In the present invention, a concrete column member whose cross-sectional shape orthogonal to the material axis has a polygonal shape (polygonal column shape) is subjected to a shearing force orthogonal to the material axis to rotate and deform around the lower end surface or the upper end surface. when the to, relates polygonal ridge portions collapse suppressing performance have not been crushed inhibitory concrete pillar member of.

  In a structure where a plurality of concrete or concrete pillar members arranged in two directions on a plane are assembled and bear vertical and horizontal loads of the superstructure, the pillar members act on the superstructure. As a result of receiving a bending moment and a shearing force due to the horizontal load, for example, it tries to rotate or fall around the column base (lower end surface) at the lower end.

  As the column member rotates or falls, the concrete portion on the compression side of the cross section tends to collapse. In particular, when the column member receives a high compressive force (high axial force) from the superstructure, or when it is a part, collapse tends to occur from the time of occurrence of a small rotational deformation. Therefore, for example, as shown in FIG. 6 (a), in the arrangement of the column members in which the column members are distributed in two horizontal directions and the middle column and the side columns (including the corner columns) can be distinguished, When the upper structure on the side causes relative displacement with respect to the lower structure on the column base side, the side column and corner column have a higher compressive force than the middle column, so the side column and corner column are compared to the middle column. Easy to crush.

  However, in the frame shown in FIG. 6 (a), when the cross section of each column member is a square or the like, either the long side direction (X direction) or the short side direction (Y direction) in the plan view. When the column member is rotated so that the middle position of the side is at the center of rotation under the horizontal force in the direction of, the damage to the side is uniform and either corner (vertex or corner) Damage does not concentrate on the corners.

  On the other hand, as shown in FIG. 6- (a), when receiving a horizontal force (an oblique direction force) in a direction intersecting either the long side direction or the short side direction, the distance from the rotation center on the cross section is It differs between the middle part of the side and the corner side, and becomes larger at the corner part. In this relation, when the column member is about to rotate around the corner, the corner is in a state of inhibiting the rotation of the column member from the middle part of the side, so the corner is compressed from the initial stage of the rotation deformation. As a result of the force acting, the corners are more likely to be damaged than the middle positions of the sides. In particular, the corner column located on the leeward (downstream) side of the horizontal force has a larger compressive force than the middle column at the corner portion on the leeward (downstream) side, and therefore is more easily damaged.

  Therefore, a place where the end of the member comes into contact in preparation for the case where the edge on the cross section may be damaged when the concrete (built) column member or beam member tries to rotate and deform at the end. It is considered possible to avoid damage if a shock absorbing material such as an elastic body that absorbs impact is installed on the door (see Patent Documents 1 and 2). However, these examples are mechanisms that resist external force by the stress sharing of the buffer material around the column, and because the concrete cross section is significantly reduced, the bending strength and axial strength of the concrete itself are greatly lost. In addition, since the shock absorption depends on the buffer material, no consideration is given to the corners (corner corners) of the column members.

  In addition, by reducing the cross-sectional area of the connection part located at the boundary between the head of the pile corresponding to the column member and the footing from the cross-sectional area of the pile body, a method of avoiding an excessive bending moment effect on the connection part (See Patent Documents 3 and 4). However, these examples are methods of suppressing the bending moment input to the connecting member by reducing the bending strength. Since the cross-sectional area is largely lost, the bending strength and the shaft strength are greatly lost. Results in.

JP 2002-4417 A (Claim 1, Claim 3, paragraphs 0022 to 0030, FIGS. 1 to 9) JP 2002-61282 A (Claim 1, paragraphs 0016 to 0023, FIGS. 1 to 5) JP 2002-138469 A (Claim 1, paragraphs 0010 to 0015, FIGS. 1, 3, and 5 to 7) JP 2002-242207 A (Claim 1, paragraphs 0023 to 0058, FIGS. 1 to 7)

  When cushioning material is installed in the column member corresponding to the upper end and lower end of the beam member as in Patent Document 1, or when cushioning material is installed at the end of the beam member, relatively rotational deformation occurs. It is possible to protect the ends of the beam members. However, since Patent Document 1 is a beam member whose damage reduction target is specified to be either the upper end or the lower end of the end of the beam member, the generation direction is not specified, particularly on the cross section. It is difficult to expect an equivalent effect when applied to a column member in which damage is likely to concentrate at the corner (corner).

  If the cushioning material is arranged at the position where the plastic hinge is to be formed as in Patent Document 2, it is possible to alleviate the impact by shrinking the cushioning material, but the bending strength and axial strength of the concrete itself are greatly reduced. It will be.

  It is already possible to reduce the damage of the connecting portion if the connecting portion with the footing of the pile head is made into a shape (tapered shape) whose cross-sectional area decreases from the pile body side to the footing side as in Patent Document 4. It has been confirmed. However, when the connecting portion is formed in a shape in which the cross-sectional area gradually decreases, the cross-sectional area of the smallest cross-sectional area is extremely smaller than the cross-sectional area of the pile body. This causes a disadvantage that the shaft strength is significantly reduced.

  From the above background, the present invention avoids or reduces damage to a corner portion when a column member having a cross-sectional shape in which damage is likely to concentrate on the corner portion on the cross section tends to rotate around its lower end. The present invention proposes a crush-suppressing concrete column member that can be used and a column using the same.

The crush-suppressing concrete column member of the invention according to claim 1 corresponds to a corner portion of either the lower end surface or the end surface of either upper end surface when subjected to a shearing force in a direction perpendicular to the material axis. In the column member that rotates and deforms around the part to be
The cross-sectional shape perpendicular to the material axis is a polygonal shape that extends from at least one of the end faces in the material axis direction to any ridge line on the peripheral surface, and a part of the surface side including the ridge line is removed to form a chamfered portion. shape was, the removal portion and a point on the ridge, a plane through each point on the two sides intersecting with the edge line at the end face, or excised with a curved surface, the corner prior to removal between the ridge It is a portion including a corner portion, and when rotating around the end surface, the chamfered portion is in contact with the chamfered portion from the state where the end surface is bonded to the casing to which the end surface is bonded. As a requirement.

  “Polygonal shape” is intended to include not only basic polygons in which each side is composed of straight lines but also shapes in which at least some of the sides are composed of curves (Ruleux polygons), excluding vertices. is there. Since the cross-sectional shape is a “polygonal shape”, the columnar member has a polygonal column shape, and an extreme example includes a triangular columnar shape.

  “At least one end surface in the material axis direction” refers to at least one of the upper end surface and the lower end surface of the column member, and may include both the upper end surface and the lower end surface. “A part of the surface side including the ridge line from the end face to any ridge line of the peripheral surface” means a column (polygonal column) whose column member has a polygonal cross section such as a rectangle (rectangle) as shown in FIG. ), A triangular pyramid-shaped portion including any ridge line of the peripheral surface is pointed out from any two adjacent sides of the polygon forming the end face, and the triangular pyramid-shaped portion becomes a removed portion. . When the column members are likely to cause rotational deformation on both the upper end surface and the lower end surface so that a plurality of column members are gathered to form a piloti, removal portions are formed on both the upper end surface and the lower end surface. Sometimes.

  The “removed portion” refers to a portion that is removed when it is assumed that the column member is formed in a prismatic shape and a part of the concrete constituting the column member is cut (removed). The "removal part" is basically formed by leaving the formwork when the column member is constructed or manufactured, but it is formed by cutting the column member after making it into a prismatic shape. There is also. As a result of the removal of any corner (the part including the ridge line) on at least one end face side of the column member body that is a polygonal column shape over the entire length, that is, by removing the removed portion, A “chamfer” is formed.

  “One point on the ridge line” refers to a point moved from the vertex of the polygon forming the end face of the column member to the middle side in the axial direction along the ridge line, and “each point on two sides intersecting the ridge line on the end face” is Two points on two adjacent sides sandwiching the vertex of the polygon forming the end face of the column member are indicated. A solid including three points, “the point moved from the vertex of the polygon to the middle side in the axial direction” and “two points on two sides sandwiching the vertex” becomes a triangular pyramid-shaped portion as a removal portion.

  Since the removed part is a shape cut off by a flat surface or curved surface, the surface of the pillar member that remains after the removal of the “removed part” (the “chamfered part” that is the surface after removing the “removed part”) is It can be flat or curved. The surface (chamfered portion) after the removal of the “removed portion” is a triangular surface including a point on the ridge line and two points on two sides sandwiching the vertex.

  As shown in FIG. 1, if the ridgelines at the four corners (all corners) of the column member whose end face is rectangular are removed, the shape of the remaining end face becomes an octagon. The “removed portion” has a triangular pyramid shape having two sides sandwiching the vertex of the polygon and a ridge line as a hypotenuse, or a triangular pyramid shape having a bottom surface that includes the vertex of the polygon and the two sides sandwiching the vertex.

  For example, in a frame in which a square columnar column member is oriented as shown in FIG. 6A, that is, with two sides of the end face facing the X and Y directions, the horizontal force in the X and Y directions Since the column member tries to rotate around the side when subjected to (X direction force and Y direction force), the possibility of damage occurring in the concrete is low. On the other hand, the corner portion of the end face is more likely to be damaged when receiving a horizontal force (an oblique direction force) in a direction intersecting the two, so the “removed portion” (the chamfered portion) is a column member. What is necessary is just to form in the part containing at least any one ridgeline of a prism.

  Also, in the arrangement state of the column members shown in FIG. 6A, the corner column located at the lower left of the four corner columns located at the corners of the four corners on the plane is an oblique direction from the upper right to the lower left 6B, the lower end surface of the column member is easily damaged at the lower left corner where the compressive force is concentrated. The corner column located on the lower left side of the plane is subjected to the diagonal force from the lower left corner to the upper right corner when the diagonal force is applied from the lower left corner to the upper right corner. Since the compressive force does not act as much on the upper right corner of the lower end surface as the compressive force at that time, it is not always necessary to form a removal portion (chamfered portion) in the upper right corner.

Accordingly, if a removal portion (chamfered portion) is formed on the lower end surface of the corner column located at the lower left in FIG. 6- (a), the end surface of the column member is formed in a shape as shown in FIG. 4- (a). It will be good. FIG. 4- (a) shows the column member 1 that requires “the chamfered portion 6 is formed only in a portion including one ridge line on the end surface of the column member” . In this case, since the chamfered portion 6 only needs to be formed at one corner portion on the end surface of the column member, the amount of reduction in the area of the end surface of the column member may be small. Therefore, at least one corner of all corner portions (four corners) In the case where the removed portion (chamfered portion) is formed at the corner portion, there is an advantage that the bending strength and axial strength of the column member can be minimized.

  However, when the column member is a side column other than the corner column and is located on the downstream side of the applied force, for example, the horizontal force in the direction indicated by external force (1) or external force (2) in FIG. When the force is applied, the two corners located on the downstream side of the end face may receive the same compressive force. Therefore, it is appropriate to form the removal part (chamfered part) at these two places. In some cases.

FIG. 4B shows the column member 1 that requires that the chamfered portion 6 is formed in a portion including an adjacent ridgeline . Since the chamfered portion 6 is formed in a portion including an adjacent ridgeline, the chamfered portion 6 includes a case where a removed portion is formed in a three corner portion excluding one corner portion and a case where a removed portion is formed in all corner portions (four corners). If the removal portion is formed only at the adjacent two corners on the end face of the column member as shown in FIG. 4B, the amount of reduction in the area may be halved as compared with the case where the removal portion is formed at all the corners. Therefore, a decrease in the bending strength and axial strength of the column member can be suppressed.

  4- (a) and (b), in at least one end surface of the pillar member, the pillar member is formed in a shape in which at least a part of the ridge line of the polygon is removed. Since the end face of the member has a shape in which the difference in distance from the center on the cross section to the edge (side and apex) is uniform, the concentration of compressive force is reduced, and the column member has a shape that is not easily damaged.

As shown in FIG. 7, the column member of the form shown in FIG. 4- (a) is from a direction in which a plurality of column members are inclined in the X direction and the Y direction in a column array in which two column members are arranged in two directions. When receiving a horizontal force (an oblique direction force), it is suitable for use as a corner post and a side post located on the downstream side of the applied force . In both the case of the corner column and the side column, the column member is removed from the four corners of the end face at the downstream corner where the collapse is likely to occur when positioned on the downstream side of the applied force as shown in FIG. It arrange | positions so that a part (chamfering part) may be located.

The column array using the crush-suppressing concrete column member shown in FIG. 7 is a column array in which a plurality of column members are arranged in two directions on the plane, and the outer circumference including the corners on the plane among the column members. The crush-suppressing concrete column member according to claim 1 or 2 is used for the column member positioned at the portion, and the chamfered portion of the corner column positioned at the corner portion on the plane is a corner angle on the plane. It is formed on the same side and parts, chamfer doorjamb located on the outer peripheral portion excluding the corner portion on the plane is formed on the corner pillar side of the sides located on the side post and on the same column .

The crushing suppression type concrete column member shown in FIG. 4- (a) requires that the chamfered portion 6 is formed only in a portion including one ridge line on the end face , and the crushing suppression type shown in FIG. 4- (b). concrete columns are the requirements to "be formed in a portion including the edge line adjacent the chamfer 6". “Outer peripheral part including corners on a plane” means that the outer peripheral part (excluding the middle pillar) in the column array arranged in two directions on the plane as shown in FIG. 6 (a) and FIG. Refers to the pillar members (corner pillars and side pillars).

  The shape of the column member shown in FIG. 4- (a) is a removed portion when the column member receives a high axial compression force (high axial force) or when it is assumed that the portion is downstream of the applied force. An example of forming the (chamfer 6) is shown. Here, the case where the line where the surface of the chamfered portion 6 intersects the end surface 2 of the column member 1 is a straight line is shown, but it may be a curved line as shown in FIG.

  The chamfered portion 6 is preferentially formed at a corner portion that is most easily damaged by the column member 1 receiving a compressive force and a horizontal force, and may be (secondarily) possibly damaged next. It is also formed at the corners. In that case, the area of the end face 2 of the column member 1 is reduced by forming the area of the chamfer 6 that is most likely to be damaged relatively large and forming the area of the secondary chamfer 6 relatively small. It is possible to suppress the decrease in the compression strength of the column member 1.

The end face 2 of the pillar member in addition to being removed in the portion of the closer (part including ridge line 4) corners, with part including the ridge line 4, 4 adjacent pillar member as shown in FIG. 2, this adjacent The part including the side 5 of the end face 2 between the chamfered parts 6 and 6 including the ridgelines 4 and 4 may be further removed .

In claim 1, the removal portion (the chamfered portion 6) is formed at the corner portion of the end surface 2 of the column member, so that damage (collapse) of the concrete of the column member is suppressed at the corner portion of the end surface 2, In the example shown in FIG. 2, the chamfered portion 7 is formed also in the portion of the side 5 between the corner portions, so that the damage is also suppressed in the portion of the side 5. Accordingly, as a result, a removal portion (chamfered portion 7) is formed continuously from the corner portion (ridge line portion) and the side 5, and a chamfered portion 6 and a chamfered portion 7 are formed continuously around the entire periphery of the end surface 2. It is possible to suppress damage around the entire circumference.

  The column member from which the removed portion is absent is constructed of a reinforced concrete structure or a steel-framed reinforced concrete structure with a cast-in-place concrete structure, or a precast concrete. The column member may be prestressed concrete (made), and in any case, the column member is constructed or manufactured by arranging a formwork having the removal surface in the removal portion.

Since the column main bars 81 and 82 in the column member are resistance elements against tensile force, as shown in FIG. 3, the column main bars 81 and 82 are evenly arranged in the circumferential direction in the range near the surface of the column member. In order to prevent the column main reinforcing bars 82 arranged in the region of the removed portion (the chamfered portion 6) at the corner portion including the ridgeline 4 from crossing the material axis out of the material axis, in principle, does not protrude from the chamfered portion 6 , It will be in the state which has not reached the chamfering part 6 (Claim 2 ), and the edge part of the column main reinforcement 82 stops in front of the chamfering part 6 , as shown to Fig.3- (a).

  However, even if the end of the column main reinforcement 82 arranged in the area of the removed portion (the chamfered portion 6) protrudes (exposes) from the removed portion (the chamfered portion 6), there is no hindrance in the rotation of the column member, and the protrusion ( If the (exposed) portion is normally protected by some member, the end of the column main reinforcement 82 may protrude from the chamfered portion 6.

As shown in FIGS. 5A and 5B, all column main bars may be arranged in a region other than the removed portion (the chamfered portion 6) on a cross section orthogonal to the material axis . In this case, the same number of column main bars are arranged as there are no removal parts (chamfered parts) in the column member, and the column main bars arranged closer to the corners as in FIG. 3 are the end faces of the column members. Therefore, all the column main bars are fixed to a frame such as a slab or a beam to which the column members are to be joined. Therefore, it is possible to expect a function of transmitting a tensile force between the column member and the frame to all column main bars.

  At least one end surface of the column member is formed from at least one of the end surfaces in the material axis direction to any ridge line of the peripheral surface, and the column member is formed in a form in which a part on the surface side including the ridge line is removed. Thus, the end face of the column member has a shape in which the difference in distance from the center on the cross section to the edge (side and apex) is equalized, so that the concentration of compressive force when the column member is rotationally deformed is reduced. As a result, since the column member has a shape that is difficult to cause damage, it is possible to suppress the occurrence of damage (collapse) in the ridge line portion when the column member is rotationally deformed around the lower end surface or the upper end surface.

A perspective view showing an example of manufacturing a column member when a removal part (chamfered part) is formed at the four corner positions (all corner positions) of the end face when the main body part excluding both ends in the material axis direction is a square pillar shape. FIG. It is the perspective view which showed the example at the time of forming the removal part (chamfering part) also in the edge part of an end surface. (A) is the longitudinal cross-sectional view which showed the bar arrangement state of the column main reinforcement in a column member, (b) is the xx sectional view taken on the line of (a), (c) is the yy sectional view taken on the line (a). It is. (A) is an end view showing an example of manufacturing a column member when a chamfered portion is formed only at one corner of the end surface of the column member, and (b) is a chamfered portion that forms a curved surface at two adjacent corners. It is the end elevation which showed the example of manufacture of the column member at the time of forming. (A) is a sectional view in the axial direction showing an example of column main bar arrangement in the case of the manufacturing example shown in FIG. 4- (a), and (b) is a column main bar when chamfered portions having curved surfaces are formed at the four corners. It is sectional drawing of the axial direction which showed the example of this bar arrangement. (A) is a plan view showing a structure in which a plurality of column members are arranged in two directions on a plane and an action direction of a horizontal force, and (b) is a horizontal force acting in an oblique direction in (a). It is the perspective view which showed a mode when the pillar member located in the lower left raise | generates when carrying out rotation deformation. In the column array shown in FIG. 6A in which the column members are arranged in two horizontal directions, a removal portion (chamfered portion) is positioned at a corner portion located on the downstream side of the applied force in the four corners of the rectangular cross section. It is the top view which showed the arrangement | sequence state at the time of arrange | positioning a corner pillar and a side pillar so that.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

  In FIG. 1, the cross-sectional shape orthogonal to the material axis is a polygonal shape, and extends from at least one end surface 2 in the material axis direction to any ridge line 4 of the peripheral surface 3, and a part of the surface side including the ridge line 4 is The example of manufacture of the crush suppression type | mold concrete column member (henceforth column member) 1 which carried out the removed shape is shown. The pillar member 1 is used not only as a pillar in a building structure but also as a pillar in a civil engineering structure such as a bridge pier, an abutment, or a bridge.

  As shown in FIG. 1, the removed portion has a shape cut out by a plane or curved surface passing through one point on the ridge line 4 and each point on the two sides 5 and 5 intersecting the ridge line 4 on the end surface 2 of the column member 1. The column member 1 has a shape in which the chamfered portion 6 is formed by cutting away the removed portion on at least one end surface 2 side. The end surface 2 of the column member 1 indicates either one or both of the upper end surface and the lower end surface of the column member 1. FIG. 1 shows a case where the chamfered portion 6 is formed by removing the four corners (all corner portions) of the end face 2, but the chamfered portion 6 may be formed only at one corner portion of the four corners. , It may be formed at three corners except for one corner.

  The chamfered portion 6 is, for example, an arrangement position on the plane of the column member 1 in the combination of a plurality of column members 1 in the arrangement state shown in FIG. Or under the pillar member 1 depending on the form of the frame supported by the column of column members 1, for example, a frame with a wall (seismic wall) or a frame without a wall. It is formed on at least one of the end surface and the upper end surface, or both.

  The chamfered portion 6 may be formed in a range including at least one of the ridgelines 4 on a polygonal plane (cross section) as shown in FIG. There is no need to be done. 4- (a) and FIG. 5- (a) are ranges including one ridge line 4 among the four ridge lines 4 when the end surface 2 (cross section) of the column member 1 is a square (square) shape. Only the case where the chamfered portion 6 is formed is shown.

  4- (a) and FIG. 5- (a) are subjected to an oblique force applied from the upper right to the lower left of the pillar members 1 arranged in a lattice shape in two directions as shown in FIG. 6 (a). In the end face 2 (cross section) of the column member 1 located on the lower left side, which is the downstream side of the applied force, only in the corner portion located in the downstream side (the range including the ridge line in the lower left corner portion), The case where the chamfered part 6 is formed is shown.

  In FIG. 6A, the column member 1 located at the lower left is positioned on the upstream side of the applied force when receiving an oblique force applied from the opposite lower left to the upper right, thereby forming the chamfered portion 6. The chamfered portion 6 is not formed in this corner portion (upper right corner portion) because the compressive force received by the opposite corner portion of the section across the center on the cross section is not excessive. .

  When the column members 1 in the two directions in the arrangement state shown in FIG. 6A are subjected to an oblique force applied from the upper right to the lower left, a plurality of column members 1 positioned on the upper right side have a plurality of force direction downstream sides. By the presence of the column member 1, the compressive force received by the lower left corner in the end surface 2 of the column member 1 located on the upper right is not excessive. On the other hand, since the column member 1 does not exist on the downstream side in the force direction of the column member 1 located at the lower left, the compression received by the lower left corner in the end surface 2 when the force in the same direction is applied. The force becomes excessive and crushing is likely to occur.

  As described above, there is a difference in the degree of compressive force received by each corner portion in the end surface 2 of each column member 1 depending on the arrangement state of the column members 1 in the two directions and the direction of the applied force direction, and there is a difference in the possibility of crushing. Therefore, which corner portion of each column member 1 is formed with the chamfered portion 6 depends on the arrangement state of the column members 1 in two directions and the arrangement position of the specific column member 1 therein.

  FIG. 4- (b) shows chamfering at two corners (in a range including the ridge line) located on the downstream side when external forces (1) and (2) in two oblique directions are received as shown in FIG. When the part 6 is formed, FIG. 5- (b) shows the case where the chamfered part 6 is formed at all corners. FIG. 4B and FIG. 5B particularly show a case where the cut surface that is the surface of the chamfered portion 6 is a curved surface.

  FIG. 2 shows a case in which chamfered portions 7 straddling the chamfered portions 6 and 6 at both corner portions are also formed in the sides 5 and 5 between adjacent corner portions. When the chamfered portion 7 is formed, it may be formed only on one of the sides 5 of the end surface 2 or may be formed on four sides.

  FIG. 3A shows a state in which the column member 1 is joined to the upper end surface of the lower floor side housing 9 at the lower end surface. Column main bars 81 and 82 are arranged closer to the surface on the cross section of the column member 1. The housing 9 is mainly a slab or a beam, but may be a foundation (footing) depending on the installation location of the column member 1.

  As shown in FIG. 3- (a), on the cross section of the column member 1, the column main reinforcement 81 arranged in a region other than the removal portion (the chamfered portion 6) of the corner portion including the ridge line 4 is the removed portion (the chamfered portion 6). ) And the main bar 82 arranged in the area of the removal part (chamfer 6) reaches the removal part (chamfer 6). The bar is arranged in a state where it does not protrude or protrudes from the chamfered portion 6. The columnar main muscles 81 and 82 are surrounded by main muscle restraining muscles 83 such as hoops and spiral muscles.

  Transmission of the tensile force between the column member 1 and the housing 9 is performed by the column main reinforcement 81 arranged in a region other than the chamfered portion 6, and the column main reinforcement 82 arranged in the region of the chamfered portion 6 is used as the column member 1. It functions as a resistance element against the tensile force generated inside.

  FIG. 3 shows a case where the column main reinforcing bars 82 that do not protrude from the chamfered portion 6 are arranged in the area of the removed portion (the chamfered portion 6) of the corner portion on the cross section of the column member 1, but FIG. (B) does not arrange the column main reinforcement 82 in the area of the chamfered portion 6, and the column main reinforcement 81 when the column main reinforcement 82 to be arranged in the chamfered portion 6 is arranged closer to the center of the cross section than the chamfered portion 6. , 82 bar arrangement examples.

  In the case of FIGS. 5A and 5B, the column main reinforcement 81 arranged at the position closest to the ridge line 4 continuous to the chamfer 6 on the cross section becomes the column main reinforcement 82 to be arranged on the chamfer 6. Applicable. However, the column main reinforcement 82 to be arranged in the chamfered portion 6 is located in a range other than the chamfered portion 6 together with the column principal reinforcement 81 arranged in the other, so that the reinforcement is projected from the end surface 2 of the column member 1. Therefore, the function of transmitting a tensile force between the column member 1 and the housing 9 is exhibited.

  FIG. 7 shows a case in which a plurality of column members 1 having a square cross section are arranged in two directions (X direction and Y direction) on a plane in two directions of oblique direction force (FIG. 4- (b)). When the external force (1), (2)) is received, the removal portion (the chamfered portion 6) is located at the corner located on the downstream side in each direction among the four corners (all corners) on the cross section. Thus, the arrangement state when the corner pillars and the side pillars are arranged is shown.

  For example, when the column member 1 (corner column) arranged at the upper left is subjected to an oblique force applied from the lower right to the upper left, the four corners on the cross section (all corner portions) are located on the downstream side of the applied force. ), The upper left corner, which is the downstream corner, receives the axial compression force, and the column member 1 tries to rotate around the corner, so the upper left corner. Is easily damaged, a removed portion (chamfered portion 6) is formed in the upper left corner. Conversely, in the column member 1 (corner column) arranged on the same upper left, the lower right corner, which is the corner on the upstream side of the applied force, receives the axial compressive force as much as the upper left corner. Since there is no possibility of crushing, the removal part (the chamfer 6) is not formed in the lower right corner.

  The same applies to the other column members 1 (corner columns) arranged at the four corners in two directions in FIG. Part 6) is formed, and removal parts (chamfered parts 6) are formed only in the lower left and lower right corners of the lower left and lower right column members 1 (corner pillars), respectively.

  In FIG. 7, the upper left and upper right corners of the side columns (two column members 1 positioned in the middle in the X direction) located in the upper row are obliquely applied from the lower right to the upper left, and from the lower left, respectively. Since it becomes the downstream side of the applied force when it receives an oblique force applied to the upper right, both corners are rotated and deformed while receiving compressive force, so only the upper left and upper right corners are removed. A portion (chamfered portion 6) is formed.

  Similarly, the lower left corner and the lower right corner of the side column located in the lower row (two column members 1 located in the middle in the X direction) and the diagonal direction force from the upper right to the lower left, and from the upper left, respectively. When it receives an oblique force applied to the lower right, it will be on the downstream side of the applied force, so both corners will rotate and deform while receiving compressive force. Only the removal portion (the chamfered portion 6) is formed.

  In FIG. 7, the upper left and lower left corners of the side columns (one column member 1 located in the middle in the Y direction) located in the left column are diagonally applied forces from the lower right to the upper left and the upper right, respectively. Therefore, the removal portion (the chamfered portion 6) is formed only at the upper left corner and the lower left corner.

  Similarly, the upper right corner and the lower right corner of the side column (one column member 1 located in the middle in the Y direction) located in the right column are diagonally applied from the lower left to the upper right and the upper left to the right, respectively. Since it becomes the downstream side of the applied force when it receives a downward applied force in the oblique direction, the removal portion (the chamfered portion 6) is formed only in the upper right and lower right corners.

1 ... Column member, 2 ... End face, 3 ... Circumferential surface, 4 ... Ridge line, 5 ... Side,
6 ... Chamfered part, 7 ... Chamfered part,
81, 82 …… Cylinder main muscle, 83 …… Main muscle restraint muscle,
9 …… The body.

Claims (2)

In the column member that is rotationally deformed around the portion corresponding to the corner portion of either the lower end surface or the end surface of the upper end surface when receiving a shearing force in a direction perpendicular to the material axis,
The cross-sectional shape perpendicular to the material axis is a polygonal shape that extends from at least one of the end faces in the material axis direction to any ridge line on the peripheral surface, and a part of the surface side including the ridge line is removed to form a chamfered portion. shape was, the removal portion and a point on the ridge, a plane through each point on the two sides intersecting with the edge line at the end face, or excised with a curved surface, the corner prior to removal between the ridge It is a part including the corner,
When the end face is rotated and deformed around a portion corresponding to the corner portion, the end face is joined to the casing to which the end face is joined, and the chamfered portion is brought into contact with the casing. A crush-suppressing concrete column member. The column main reinforcement arranged in the area of the chamfered portion of the corner portion including the ridge line on the cross section perpendicular to the material axis among all the main column reinforcing bars does not reach the chamfered portion. 1. A crush-suppressing concrete column member according to 1.

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