Brace structure

Abstract

To provide a brace structure easy to secure sufficient strength against a load applied to an axial direction of a brace.SOLUTION: In a brace structure 1 which has a joint part 10 jointing a brace 3 to a column 5 in a displaced state in a face-outer direction Z in relation to a base line F of the column 5, the joint part 10 comprises a face contact part 23 which has a face-outer face contact part 21 coming into face contact with the column 5 from the face-outer direction Z, and a face inner-face contact part 22 coming into face contact with the column 5 from an inner face direction Y.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a brace structure having a joint for joining a brace to a column, and in particular to a brace structure having a joint for joining a brace to a column while being shifted in an out-of-plane direction relative to the center line of the column. [Background technology]

[0002] Patent Document 1 shows a brace structure having a joint (base 3) for joining a brace 5 to a column 1. In such a brace structure, a wall or other structure may be constructed on the center line of the column 1, and in order to install the brace 5 while avoiding the structure, the brace 5 is joined to the column 1 while being shifted in the out-of-plane direction with respect to the center line of the column 1. When the brace 5 is joined to the column 1 by a joint, it is joined using PC steel 4 with the surface contact part of the joint in surface contact with the column in the out-of-plane direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 11-061982 Summary of the Invention [Problem to be solved by the invention]

[0004] However, as described above, when the brace 5 is joined to the column 1 by a joint that contacts the column 1 in the out-of-plane direction, stress is transmitted by the shear strength of the PC steel 4, making the PC steel 4 prone to damage and raising the risk of insufficient strength at the joint between the column and the joint.

[0005] In view of this situation, a main object of the present invention is to provide a brace structure that can easily ensure sufficient strength against a load acting in the axial direction of the brace. [Means for solving the problem]

[0006] The first characteristic configuration of the present invention is a brace structure having a joint that joins the brace to the column in a state where the brace is shifted in an out-of-plane direction with respect to the center line of the column, The joint portion includes a surface contact portion having an out-of-plane surface contact portion that makes surface contact with the column from the out-of-plane direction and an inner-plane contact portion that makes surface contact with the column from the in-plane direction. 、 The pillar is formed in a cylindrical shape, The surface contact portion is formed in an arc shape corresponding to an outer shape of the pillar, The side on which the brace extends from the joint in the in-plane direction is defined as the inner side, and the opposite side is defined as the outer side, The surface contact portion has an insertion hole for inserting a one-sided bolt for joining the joint portion to the column in an outer portion located on the outer side with respect to the center of the column in the in-plane direction. It is at the point.

[0007] According to this configuration, the brace that is offset in the out-of-plane direction with respect to the center line of the column can be joined to the column by the joint with the out-of-plane surface contact part of the joint in surface contact with the column in the out-of-plane direction, making it easier to join the brace that is offset with respect to the center line of the column to the column by the joint. In addition, the inner-plane contact part of the joint is in surface contact with the column from the in-plane direction, and stress can be transmitted between the eccentric brace and the column by the support pressure due to the surface contact between the inner-plane contact part and the column. This makes it easier to ensure sufficient strength at the joint and the column.

[0009] Also, With this configuration, even if the column is cylindrical, the surface contact portion is in surface contact with the column, making it easy to join a brace that is shifted in an out-of-plane direction relative to the column's center line to the column, while the large torsional rigidity provided by the cylindrical shape makes it easy to ensure sufficient strength against the torsional force acting on the column due to the eccentricity of the brace.

[0011] Furthermore, According to this configuration, by joining the joint to the column using a one-sided bolt, the joint can be joined to the column by working from one side in the out-of-plane direction. The surface contact portion of the joint formed in an arc shape, in its outer portion that is outward of the center of the column in the in-plane direction, is shaped so that as it approaches the column in the out-of-plane direction, it moves away from the center of the column in the in-plane direction, and the one-sided bolt inserted into the insertion hole provided in that outer portion is oriented so that as it approaches the column in the out-of-plane direction, it moves closer to the center of the column in the in-plane direction. Therefore, when the one-sided bolt is inserted into the insertion hole to join the joint to the column, the load acting on the tensile side in the axial direction of the brace (inner side in the in-plane direction) acts in the direction of inserting the one-sided bolt, making it easier to ensure strength against the load acting on the tensile side in the axial direction of the brace. [Brief description of the drawings]

[0012] [Figure 1] Front view of brace structure [Diagram 2] Enlarged front view of the main part of the brace structure [Diagram 3] Cross-sectional plan view of braced structure [Figure 4] Longitudinal side view of brace structure DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] An embodiment of the present invention will be described with reference to the drawings. The brace structure 1 shown in Fig. 1 is a structure in which a brace 3 is installed inside a column-beam frame 2. In this embodiment, the brace structure 1 is a structure in which a column-beam frame 2 provided in a building is retrofitted for seismic reinforcement and a brace 3 made of steel material such as an angle steel is installed.

[0014] As shown in FIG. 1, the column-beam structure 2 has a rectangular space formed inside the columns 5, beams 6, and concrete floor 7, and a wall 8 is installed in this rectangular space. As shown in FIG. 3, the wall 8 is within the width of the columns 5 and beams 6 in the front-rear direction Z, and is installed within the structural surface of the column-beam structure 2. The center line F of the column 5 is located within the width of the wall 8 in the front-rear direction Z. As shown in FIG. 1, the brace 3 is installed inside the column-beam structure 2 when viewed in the front-rear direction. Also, as shown in FIG. 3 and FIG. 4, the brace 3 is installed at a position shifted in the front-rear direction Z with respect to the wall 8. In this embodiment, the brace 3 is installed on the front side Z1 with respect to the wall 8. The column 5 is formed in a cylindrical shape. In this embodiment, the column 5 is formed in a hollow cylindrical shape, that is, in a cylindrical shape. The columns 5 include a left column 5A and a right column (not shown) on the right side Y2 of the left column 5A, and the brace 3 is installed across the left column 5A and the right column.

[0015] The brace structure 1 will be described below. The direction in which the beams 6 and the concrete floor 7 are aligned is the up-down direction X, the direction in which the left column 5A and the right column are aligned is the left-right direction Y, and the direction perpendicular to the up-down direction X and the left-right direction Y is the front-back direction Z. In addition, the side of the wall 8 in the front-back direction Z where the brace 3 exists is the front side Z1, and the opposite side is the rear side Z2.

[0016] The brace structure 1 includes a joint 10 that joins the brace 3 to the column 5 in a state where the brace 3 is shifted in the front-rear direction Z (out-of-plane direction) with respect to the grid center F of the column 5. The brace structure 1 also includes a holding frame 11 that holds the center of the brace 3 in the axial direction. In the renovation work for earthquake reinforcement, the tip of the brace 3 is joined to the column 5 by the joint 10, and the brace 3 is installed in a position shifted in the front-rear direction Z (out-of-plane direction) with respect to the grid center F of the column 5, and the center of the brace 3 in the axial direction is joined to the holding frame 11. The brace 3 is installed on the front side Z1 of the grid center F of the column 5. In this embodiment, the brace 3 is installed on the front side Z1 of the front end of the column 5 and the front end of the beam 6, and is installed on the front side Z1 of the front surface of the wall 8. By installing the brace 3 in this manner, it is possible to carry out earthquake-resistance reinforcement work for the column-beam structure 2 from only one side (front side Z1) in the front-rear direction Z. In addition, since the center of the brace 3 in the axial direction is held by the holding frame 11, it is possible to prevent the brace 3 from sagging.

[0017] The holding frame 11 comprises a frame main body 16 made of steel such as an H-shaped steel, a brace joint 17 that joins the brace 3 to the center of the holding frame 11 in the vertical direction X, a beam joint 18 that joins the upper end of the frame main body 16 to the beam 6, and a floor joint 19 that joins the lower end of the frame main body 16 to the floor concrete 7. The beam joint 18 is joined to the front surface of the beam 6 in a state where it protrudes from the beam 6 to the front side Z1. The frame body 16 is joined to the end of the beam joint 18 on the front side Z1, and is located on the front side Z1 with respect to the wall 8. The brace joint 17 is joined to the center of the frame body 16 in the up-down direction X, and is formed in a plate shape protruding on both sides in the left-right direction Y with respect to the frame body 16.

[0018] The brace 3 includes a first brace 13 and a second brace 14 . The first brace 13 has one axial end joined to the upper end of the left column 5A by a joint 10 and the other axial end joined to the lower end of the right column by a joint 10, and is installed across the upper end of the left column 5A and the lower end of the right column. In addition, the first brace 13 has an axial center joined to the holding frame 11 and is held by the holding frame 11. The second brace 14 has one axial end joined to the lower end of the left column 5A by a joint 10 and the other axial end joined to the upper end of the right column by a joint 10, and is installed across the lower end of the left column 5A and the upper end of the right column. The second brace 14 has an axial center joined to the holding frame 11 and is held by the holding frame 11.

[0019] The joining of the brace 3 to the support frame 11 will now be described. The first brace 13 is divided into two in the axial direction, an upper left brace section 13A and a lower right brace section 13B. One axial end of the upper left brace section 13A is joined to the upper end of the left column 5A, and the other axial end is joined to a portion of the brace joint 17 that protrudes from the frame body 16 to the left side Y1. One axial end of the lower right brace section 13B is joined to a portion of the brace joint 17 that protrudes from the frame body 16 to the right side Y2, and the other axial end is joined to the lower end of the right column.

[0020] The second brace 14 is divided into two in the axial direction, a lower left brace section 14A and an upper right brace section 14B. The lower left brace section 14A has one axial end joined to the lower end of the left column 5A, and the other axial end joined to a portion of the brace joint 17 protruding from the frame body 16 to the left side Y1. The upper right brace section 14B has one axial end joined to a portion of the brace joint 17 protruding from the frame body 16 to the right side Y2, and the other axial end joined to the upper end of the right column.

[0021] The joint 10 has a surface contact portion 23 that comes into surface contact with the column 5. The surface contact portion 23 is formed in an arc shape that matches the outer shape of the column 5. The side from which the brace 3 extends from the joint 10 in the left-right direction Y is defined as the inner side U (the right side Y2 in Figs. 2 and 3), and the opposite side is defined as the outer side S (the left side Y1 in Figs. 2 and 3), and the surface contact portion 23 has an outer portion 28 that is on the outer side S with respect to the center P of the column 5 in the left-right direction Y. The surface contact portion 23 has an insertion hole 32 in the outer portion 28 through which a one-sided bolt 31 for joining the joint 10 to the column 5 is inserted. In this embodiment, the surface contact portion 23 includes, in addition to the outer portion 28, an inner portion 29 located on the inner side U of the center P of the column 5 in the left-right direction Y, and a central portion 30 located between the outer portion 28 and the inner portion 29 in the left-right direction Y and at the same position as the center P of the column 5 in the left-right direction Y. The surface contact portion 23 includes, in addition to the outer portion 28, an insertion hole 32 for inserting the one-side bolt 31 also in the central portion 30. Note that the inner portion 29 does not include the insertion hole 32 for inserting the one-side bolt 31.

[0022] The outer portion 28 is located on the outer side S and the front side Z1 of the pillar 5, and is in surface contact with the pillar 5 from the outer side S and the front side Z1. The inner portion 29 is located on the inner side U and the front side Z1 of the pillar 5, and is in surface contact with the pillar 5 from the inner side U and the front side Z1. Therefore, the outer portion 28 and the inner portion 29 function as a lateral contact portion 22 that makes surface contact with the pillar 5 from the left-right direction Y, and also function as a front contact portion 21 that makes surface contact with the pillar 5 from the front-rear direction Z. The central portion 30 is located at the same position as the center P of the pillar 5 in the left-right direction Y and at the front side Z1 of the pillar 5, and is in surface contact with the pillar 5 from the front side Z1. Therefore, the central portion 30 functions as a front contact part 21 that comes into surface contact with the pillar 5 from the front-rear direction Z. In this way, the joint 10 is provided with a surface contact portion 23 having a front contact portion 21 (corresponding to the out-of-plane surface contact portion) that makes surface contact with the column 5 from the front-to-back direction Z (out-of-plane direction) and a lateral contact portion 22 (corresponding to the in-plane surface contact portion) that makes surface contact with the column 5 from the left-to-right direction Y (in-plane direction).

[0023] Next, based on FIG. 2 to FIG. 4, an explanation will be given of the upper left joint 10 that joins the first brace 13 to the upper end of the left column 5A as an example. In addition to the upper left joint 10, there is a lower left joint 10 that joins the second brace 14 to the lower end of the left column 5A, a lower right joint 10 (not shown) that joins the first brace 13 to the lower end of the right column, and an upper right joint 10 (not shown) that joins the second brace 14 to the upper end of the right column, but the explanation of these joints 10 will be omitted. In addition, the lower left joint 10 is configured in the same way as the upper left joint 10, except that the shape of the joined part 25 described later is different. In addition, the upper right joint 10 has a shape that is inverted in the left-right direction Y from the upper left joint 10, and the lower right joint 10 has a shape that is inverted in the left-right direction Y from the lower left joint 10.

[0024] The joint 10 at the upper left comprises an arc-shaped portion 24 which forms the front contact portion 21 and the side contact portion 22, a joinable portion 25 to which the first brace 13 is joined, and an intervening portion 26 which is interposed between the arc-shaped portion 24 and the joinable portion 25 to join them.

[0025] The interposed portion 26 is configured by combining, in a lattice pattern, a plurality of horizontal members 34 formed in a plate shape oriented along the left-right direction Y and the front-rear direction Z, and a plurality of vertical members 35 formed in a plate shape oriented along the up-down direction X and the front-rear direction Z. Each of the plurality of horizontal members 34 and the plurality of vertical members 35 has an end on the rear side Z2 joined to the arc-shaped portion 24, and an end on the front side Z1 joined to the joined portion 25.

[0026] The joined portion 25 is formed in a shape that protrudes from the intermediate portion 26 toward the lower left, and an end of the brace 3 is joined to the portion of the joined portion 25 that protrudes from the intermediate portion 26. The joined portion 25 is on the front side Z1 with respect to the column 5, beam 6, and wall 8, and the upper left brace portion 13A of the brace 3 joined to this joined portion 25 is also on the front side Z1 with respect to the column 5, beam 6, and wall 8.

[0027] The arc-shaped portion 24 includes a central portion 30, an outer portion 28 on the left side Y1 of the central portion 30, and an inner portion 29 on the right side Y2 of the central portion 30. The outer portion 28 is on the left side Y1 and the front side Z1 of the left-side column 5A, and is in surface contact with the column 5 from the left side Y1 and the front side Z1. The inner portion 29 is on the right side Y2 and the front side Z1 of the column 5, and is in surface contact with the column 5 from the right side Y2 and the front side Z1. The central portion 30 is on the front side Z1 of the left-side column 5A, and is in surface contact with the column 5 from the front side Z1.

[0028] An insertion hole 32 for inserting a one-side bolt 31 is formed in the outer portion 28 and the central portion 30 of the arc-shaped portion 24. When the one-side bolt 31 is inserted into the insertion hole 32, the sleeve 31B expands in diameter to prevent it from coming loose, and by tightening the nut 31A on the front side Z1 relative to the insertion hole 32, it can be fastened from only one side (the front side Z1, which is one side in the front-rear direction Z in this embodiment).

[0029] The insertion hole 32 is a hole penetrating along the radial direction of the column 5 and the arc-shaped portion 24, and the one-side bolt 31 inserted into this insertion hole 32 is oriented along the radial direction of the column 5 and the arc-shaped portion 24. In other words, the one-side bolt 31 inserted into the insertion hole 32 of the central portion 30 is oriented perpendicular to the left-right direction Y (the direction along which the center line F runs) when viewed in the up-down direction, and the nut 31A of this one-side bolt 31 is present on the front side Z1 of the insertion hole 32 of the central portion 30. The one-side bolt 31 inserted into the insertion hole 32 of the outer portion 28 is oriented so as to intersect with the left-right direction Y (the direction along the center line F) when viewed in the up-down direction, and the nut 31A of this one-side bolt 31 is present on the front side Z1 and also on the left side Y1 (outside S) with respect to the insertion hole 32 of the outer portion 28. Therefore, in a state in which the one-side bolt 31 is inserted into the insertion hole 32 of the outer portion 28 to join the joint 10 to the column 5, a load acting on the tensile side in the axial direction of the first brace 13 (inside U in the left-right direction Y) acts in the direction in which the one-side bolt 31 is inserted, making it easier to ensure strength against a load acting on the tensile side in the axial direction of the first brace 13.

[0030] [Another embodiment] Other embodiments of the present invention will be described below. Note that the configurations of the embodiments described below are not limited to being applied alone, but may also be applied in combination with the configurations of other embodiments.

[0031] (1) In the above embodiment, the column 5 is formed in a hollow columnar (cylindrical) shape. However, the shape of the column 5 may be changed as appropriate. Specifically, the column 5 may be formed in a square columnar or solid columnar shape, or the column 5 may be made of H-shaped steel.

[0032] (2) In the above embodiment, the front contact portion 21 and the lateral contact portion 22 are formed in an arc shape. However, the shapes of the front contact portion 21 and the lateral contact portion 22 may be changed as appropriate. For example, the front contact portion 21 may be formed in a planar shape extending along the up-down direction X and the left-right direction Y, and the lateral contact portion 22 may be formed in a planar shape extending along the up-down direction X and the front-rear direction Z.

[0033] (3) In the above embodiment, a configuration has been described as an example in which surface contact portion 23 is formed in an arc shape that corresponds to the outer shape of pillar 5. However, surface contact portion 23 does not have to have a shape that corresponds to the outer shape of pillar 5, for example, surface contact portion 23 may be formed in a U-shape when viewed in the up-down direction for a cylindrical pillar 5.

[0034] (4) In the above embodiment, the joint 10 is joined to the column 5 by the one-sided bolt 31. However, the joint 10 may be joined to the column 5 by a means other than the one-sided bolt 31, such as by welding.

[0035] (5) In the above embodiment, an example has been described in which the insertion holes 32 are provided in the outer portion 28 and the central portion 30 of the surface-to-surface contact portion 23. However, the positions at which the insertion holes 32 are provided in the surface-to-surface contact portion 23 may be changed as appropriate, such as providing the insertion holes 32 only in the outer portion 28 of the surface-to-surface contact portion 23, or providing the insertion holes 32 in the outer portion 28, the inner portion 29, and the central portion 30 of the surface-to-surface contact portion 23. [Explanation of symbols]

[0036] 1 Brace structure 3. Brace 5 Pillars 10 Joint 21 Front contact part (outer surface contact part) 22 Lateral contact part (inner surface contact part) 23 Surface contact part 28 Outer part 31 One-sided bolt 32 Insertion hole C inside E Outside F Grid line P center Y left / right direction (in-plane direction) Z Anteroposterior direction (out-of-plane direction)

Claims

[Claim 1] A brace structure having a joint that joins the brace to the column in a state where the brace is shifted in an out-of-plane direction with respect to the center line of the column, The joint portion includes a surface contact portion having an out-of-plane surface contact portion that makes surface contact with the column from the out-of-plane direction and an inner-plane contact portion that makes surface contact with the column from the in-plane direction, The pillar is formed in a cylindrical shape, The surface contact portion is formed in an arc shape corresponding to an outer shape of the pillar, The side on which the brace extends from the joint in the in-plane direction is defined as the inner side, and the opposite side is defined as the outer side, The surface contact portion is a brace structure having an insertion hole in an outer portion that is on the outside relative to the center of the column in the in-plane direction, through which a one-sided bolt for joining the joint portion to the column is inserted.

Images