JP2015203246A - Reinforcement structure and building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcement structure and a building, capable of reducing cost, and capable of improving structural performance, by reducing a using member quantity.SOLUTION: A reinforcement structure comprises a pair of main diagonal members 21 having one end part connected to the vicinity of left-right joining parts J1 in a lower floor and extending toward a central part of a beam G2 of an upper floor, a damper (a damping member) 3 connected to the respective other end parts of the pair of main diagonal members 21 and the central part of the beam G2 of the upper floor, a pair of first connection members 4 for respectively connecting a joining part J2 of the upper floor and respective midway parts (a first connection part 21A) of the pair of main diagonal members 21 and a pair of second connection members 5 for respectively connecting a beam G1 of the lower floor and the respective midway parts (a second connection part 21B) of the pair of main diagonal members 21, and the first connection part 21A and the second connection part 21B are provided in a mutually separated position along the longitudinal direction of the main diagonal members 21.

Description

  The present invention relates to a reinforcing structure and a building. Specifically, the reinforcing structure is provided in a rectangular frame surrounded by left and right columns and upper and lower beams, and bears a horizontal force acting on the frame, and the reinforcing structure. It relates to the building provided.

  2. Description of the Related Art Conventionally, as a reinforcing structure for a rigid frame, a braced frame in which a reinforcing brace material is installed inside the rigid frame is used (see, for example, Patent Document 1). The braced frame rigidly joins the lower end (one end of a pair of diagonal members) of an inverted V-shaped brace made of a pair of diagonal members and the column beam joint on the lower floor, and the upper end (a pair of diagonal members). The other end portion of the upper floor is rigidly connected to the center of the beam on the upper floor, and the column beam joint on the upper floor is connected to the center of the inverted V-shaped brace with a sub-diagonal material. Such a reinforcing structure is a so-called rigid structure that is expected to improve the horizontal rigidity and horizontal strength of the frame, and cannot be expected to reduce vibrations due to energy absorption, resulting in a large response acceleration to an input such as an earthquake. There is an inconvenience.

  On the other hand, as a structural type of a building that is expected to reduce vibration, a damper-equipped frame in which a damper is installed via a brace inside a frame frame composed of columns and beams has been proposed (for example, see Patent Document 2). The frame with a damper connects a lower end portion (one end portion of a pair of diagonal members) of an inverted V-shaped brace made of a pair of diagonal members to a lower beam column beam joint portion and an upper end portion (a pair of mutually connected pair of diagonal members). The other end of the diagonal member is connected to the center of the beam on the upper floor via a damper. In such a frame with a damper, the horizontal force acting on the frame is borne by the beam ramen, the damper and the brace, respectively, thereby suppressing the interlayer displacement of the building and reducing the vibration of the building by absorbing the energy of the damper. It is intended to be illustrated.

JP 2011-179269 A JP 2007-100404 A

  However, as in the conventional structure with a damper described in Patent Document 2, in a structure in which much of the horizontal force acting on the structure is borne by the damper to increase the energy absorption performance, an inverted V-shape that supports the damper is used. It is necessary to increase the rigidity of the brace and concentrate the deformation on the damper by making the brace difficult to deform. For this reason, a steel material having a large cross-sectional area is used for the brace, resulting in an increase in the amount and weight of the steel material used, and inconvenience that the joint between the brace and the column beam becomes complicated and the construction cost increases. Furthermore, if the brace stiffness increases, the initial stiffness of the entire frame will become too high, and input to the building will be excessive when horizontal forces such as earthquake motion are applied, resulting in an increase in input acceleration and structural performance. There is also a problem that it cannot be raised sufficiently.

  Therefore, an object of the present invention is to provide a reinforcing structure and a building capable of reducing the number of members to be used and reducing the cost and improving the structural performance.

  In order to achieve the above object, the reinforcing structure according to claim 1 is a reinforcing structure that is provided in a rectangular frame surrounded by left and right columns and upper and lower beams and bears a horizontal force acting on the frame. Of the four joints at the top, bottom, left, and right where the pillar and the beam are joined, one end is connected to the vicinity of the left and right joints on either the top or bottom, and extends toward the center of the beam on the other side Connected to a pair of main diagonal members, the other end portions of the pair of main diagonal members and the beam center portion on the other side, and according to relative movement between the other end portions of the main diagonal member and the beam center portion A damping member that exerts a damping force, a pair of first connection members that respectively connect a part of the framework on the other side and each middle part of the pair of main diagonal members, and a beam of the beam on the one side A pair of second connection portions for connecting a part and each intermediate portion of the pair of main diagonal members In the main diagonal member, a first connection portion to which the first connection member is connected and a second connection portion to which the second connection member is connected are along the longitudinal direction of the main diagonal member. It is provided in the position which mutually separated.

  According to such a reinforcing structure of the present invention, each other end portion of the pair of main diagonal members whose one end portion is connected in the vicinity of the left and right joint portions (column beam joint portions), the beam center portion on the other side, And connecting the first connecting member and the second connecting member to the middle portions of the pair of main diagonal members together with the axial force instead of the mere axial force member. It can function as a bending shear member that bears a bending moment and a shearing force. And since the 1st connection member and the 2nd connection member are respectively connected from the opposite side in the position which was mutually separated in the middle part of the main diagonal material, when a horizontal force acts on a framework, the 1st connection member In addition, a reverse force acts on the main diagonal from the second connecting member, and a bending moment and a shearing force that deform the main diagonal into an S shape are generated. As a result of the pair of main diagonal members being deformed into an S shape, the other end portions thereof move (horizontal movement, vertical movement, and rotation), and the other end portion and the beam center portion on the other side. Relative movement will occur between the two. Therefore, the energy absorption effect by the attenuation member can be enhanced by using the attenuation member corresponding to the relative movement between the other end portion of the main diagonal member and the beam center portion on the other side.

  Further, since the deformation amount of the damping member is determined according to the movement of the other end portion of the main diagonal member deformed into an S shape, only the axial rigidity (cross-sectional area) of the main diagonal member is obtained for the desired energy absorption performance. By appropriately setting the bending rigidity (secondary moment of cross-section) and appropriately setting the axial rigidity of the first connecting member and the second connecting member and the connection position to the main diagonal member, The amount of deformation can be adjusted. Accordingly, it is not necessary to excessively increase the shaft rigidity compared to the conventional structure in which the deformation amount of the damping member is adjusted only by the shaft rigidity of the main diagonal member, and the material cost of the main diagonal member can be suppressed. It is possible to simplify the structure for joining the main diagonal member to the framework. In addition, by deforming the main diagonal, the deformation performance can be improved by improving the toughness by bending deformation, the horizontal rigidity of the entire frame can be suppressed, and the input acceleration of seismic motion can be reduced. .

  At this time, in the reinforcing structure of the present invention, the first connection portion is provided on one side of the longitudinal center of the main diagonal member, and the second connection portion is longer than the longitudinal center of the main diagonal member. It is preferable to be provided on the other side.

  According to this configuration, the first connection portion is connected to one side from the longitudinal center of the main diagonal member, that is, the side away from the attenuation member, and the second connection member is connected to the side closer to the attenuation member. Since the second connecting member is connected to the central portion of the beam on one side, the horizontal displacement on the other end side (attenuation member side) of the main diagonal member is suppressed (or what is the other side beam) By displacing in the opposite direction, the relative displacement with the other beam can be increased, and the amount of deformation generated in the damping member can be increased to improve the energy absorption performance.

  In the reinforcing structure of the present invention, the first connection portion and the second connection portion are respectively provided at one and the other of two places that divide the length of the main diagonal material into approximately three equal parts. Is preferred.

  According to this configuration, the first connecting portion and the second connecting member are connected to the positions at which the length of the main diagonal member is approximately divided into three parts, respectively, and the main diagonal member can be easily bent and deformed into an S shape. In addition to enhancing the energy absorption effect of the damping member, the horizontal rigidity of the entire frame can be suppressed.

  In the reinforcing structure of the present invention, the first connecting member includes a first sub-diagonal material having one end connected to the vicinity of the left and right joints on the other side and the other end connected to the main diagonal. The second connecting member is configured to have a second sub-diagonal material having one end connected to the central portion of the beam on the one side and the other end connected to the main diagonal. It is preferable.

  According to this configuration, the first connecting member is constituted by the first sub-diagonal material, and the second connecting member is constituted by the second sub-diagonal material. The joint structure with the main diagonal can be simplified. In the present invention, the first connection member and the second connection member are not limited to those made of diagonal materials, but may be made of face materials (steel plate panels, concrete panels, etc.), or a plurality of members. An assembly material (such as a truss material or a lattice material) may be combined.

  Furthermore, in the reinforcing structure of the present invention, a third connection member that connects the middle portion of the first sub-diagonal material and the second connection portion, a middle portion of the second sub-diagonal material and the first connection portion, It is preferable to further comprise a fourth connection member for connecting the two.

  According to this configuration, by providing the third connecting member and the fourth connecting member, it is possible to increase the rigidity of the reinforcing structure, and the third connecting member is connected to the middle portion of the first subclinical member, Since the fourth connecting member is connected to the middle part of the two sub-diagonal materials, a bending moment is generated in the first sub-diagonal material and the second sub-diagonal material, and these members function as a bending material. The toughness of the reinforcing structure can be increased.

  In the reinforcing structure of the present invention, the damping member is constituted by a shear type damper that exerts a damping force by shearing deformation by relative movement between the other end of the main diagonal member and the beam on the other side. Preferably it is.

  According to this configuration, by configuring the damping member with a shear type damper, it is possible to simplify the structure of the damping member itself and the joint structure between the main diagonal member and the beam on the other side. In the present invention, the damping member is not limited to the shear damper, and any damper such as a linear damper, a bending damper, a rotary damper, and a torsion damper can be used. An appropriate type of damper may be selected in accordance with the direction of relative movement between the end portion and the beam on the other side, the amount of movement, and the like.

  On the other hand, a building according to the present invention includes a rectangular frame surrounded by right and left columns and upper and lower beams, and any one of the reinforcing structures provided on the frame.

  According to such a building of the present invention, as in the reinforcing structure described above, the energy absorption effect by the damping member can be enhanced, and the deformation performance can be enhanced by the main diagonal member deformed into an S shape, and the horizontal rigidity of the frame And the input acceleration of seismic motion can be reduced. Therefore, damage to each part of the building can be reduced, and dropping or breakage of fixtures, fixtures, equipment, etc. inside the building can be suppressed, and the structural performance (seismic performance, durability performance) of the building can be improved.

  According to the present invention described above, the first connecting member and the second connecting member are connected to the main diagonal member and the main diagonal member functions as a bending member, thereby improving the toughness of the reinforcing structure and improving the deformation performance. In addition, the energy absorbing effect of the damping member can be enhanced, and the structural performance of the building can be improved.

It is a side view which shows the frame using the reinforcement structure which concerns on 1st embodiment of this invention. It is a side view which shows the modification of the said reinforcement structure. It is a side view which shows the frame using the reinforcement structure which concerns on 2nd embodiment of this invention. It is a side view which shows the modification of the said reinforcement structure. It is a figure which shows the stress analysis result of the reinforcement structure which concerns on the comparative example of this invention. It is a figure which shows the stress analysis result of Example 1 of this invention. It is a figure which shows the stress analysis result of Example 2 of this invention. It is a figure which shows the stress analysis result of Example 3 of this invention. It is a figure which shows the stress analysis result of Example 4 of this invention. It is a side view which shows the frame using the reinforcement structure which concerns on the modification of this invention.

  Hereinafter, the framework of a building using the reinforcing structure according to the first embodiment of the present invention will be described with reference to FIG. The reinforcing structure 1 of the present embodiment is applied to a building having a framework S of a steel-framed ramen structure as a main structure, for example, a building such as an office building, a commercial building, a high-rise house, or a warehouse. It is. The framework S includes a plurality of columns C and beams G rigidly connected across the left and right columns C, and a pair of left and right columns C and a pair of upper and lower beams G (the lower-level beam G1 and the upper-level beam G). It has a rectangular frame W surrounded by the beam G2). The reinforcing structure 1 is provided in a rectangular frame W of the framework S and mainly bears horizontal force (earthquake load or wind load) acting on the building. Is well-balanced.

  The column C is formed of a square steel pipe and has a cross-sectional dimension of 350 mm × 350 mm × 12 mm, for example. The beam G is made of H-shaped steel and has a cross-sectional dimension of 400 mm × 200 mm × 8 mm × 13 mm, for example. These columns C and beams G are rigidly joined to each other at a joint J formed in a box shape by welding a diaphragm to a square steel pipe having the same size as the column C. That is, in the portion of 1 span × 1 layer in the framework S, the joint portions J are provided at four locations on the upper, lower, left and right sides of the rectangular frame W, and the lower floor left and right joint portions J1 to which the lower floor beams G1 are joined. The upper floor beam G2 is joined to the upper floor left and right joints J2.

  The reinforcing structure 1 connects a main reinforcing body 2 formed in an overall mountain shape, a damper 3 as a damping member connected to the main reinforcing body 2 and the framework S, and the main reinforcing body 2 and the framework S. And a plurality of connecting members 4 and 5 (first connecting member 4 and second connecting member 5).

  The main reinforcing body 2 has a pair of main ends extending toward the center of the beam G2 on the upper floor (the other side on the upper and lower sides), with one end connected to the vicinity of the joint J1 on the left and right of the lower floor (the upper and lower sides). The diagonal member 21 and a connecting beam 22 that rigidly connects the other ends of the pair of main diagonal members 21 are configured. One end of the main diagonal 21 is bolted to a joining plate (gusset plate) 23 welded to the lower end of the column C and the end of the beam G1, and is connected to the framework S via the joining plate 23. . The main diagonal 21 is made of, for example, a 250 mm × 125 mm H-shaped steel, and the connecting beam 22 is made of, for example, a 125 mm × 125 mm H-shaped steel, and is arranged with the strong axis directed in the in-plane direction of the rectangular frame W. Yes.

  The damper 3 includes a flange 31 fixed to the connecting beam 22, a flange 32 fixed to the center portion of the upper floor beam G <b> 2, and a viscoelastic body 33 provided between the flanges 31 and 32. It is configured. The damper 3 exhibits a damping force corresponding to the relative movement between the connecting beam 22 and the upper-level beam G2, and is a shear type damper that absorbs energy by shear deformation of the viscoelastic body 33. The damper 3 is not limited to the viscoelastic body 33 but may be a metal material such as steel or lead, a high damping rubber, or a viscous material. Furthermore, the damper 3 is not limited to the shear damper, and any damper such as a direct acting damper, a bending damper, a rotary damper, a torsion damper, or the like can be used.

  Each of the pair of first connection members 4 is connected to the upper floor (on the other side of the upper and lower floors) of the left and right joints J <b> 2, and the other end is an intermediate portion of the pair of main diagonal members 21. The first sub diagonal member 41 is connected to the first connecting portion 21A. One end of the first sub diagonal member 41 is bolted to a joining plate (gusset plate) 42 welded to the upper end of the column C and the end of the beam G2, and is connected to the framework S via the joining plate 42. ing. The other end of the first sub diagonal member 41 is bolted to a joint plate (gusset plate) 43 welded to the main diagonal member 21, and is connected to the main diagonal member 21 via the joint plate 43. The first subclinical member 41 is made of, for example, 125 mm × 125 mm H-section steel, and is disposed with the strong axis directed in the in-plane direction of the rectangular frame W.

  Each of the pair of second connection members 5 is connected to the center of the beam G1 on the lower floor (upper and lower sides), and the other end is a middle portion of the pair of main diagonal members 21. A pair of second sub diagonal members 51 connected to the two connecting portions 21B are provided. One end of the second sub-diagonal member 51 is bolted to a joining plate (gusset plate) 52 welded to the central portion of the beam 1, and is connected to the framework S via the joining plate 52. The other end of the second sub-diagonal member 51 is bolted to a joining plate (gusset plate) 53 welded to the main oblique member 21 and connected to the main oblique member 21 via the joining plate 53. The first subclinical member 41 is made of, for example, 125 mm × 125 mm H-section steel, and is disposed with the strong axis directed in the in-plane direction of the rectangular frame W.

  In the main diagonal 21, the first connecting part 21 </ b> A to which the first auxiliary diagonal 41 is connected and the second connecting part 21 </ b> B to which the second auxiliary diagonal 51 is connected are mutually in the longitudinal direction of the main diagonal 21 ( It is provided at a position separated in the axial direction. Specifically, the first connection portion 21 </ b> A in the present embodiment is provided on the lower side (upper and lower sides) of the main diagonal 21 and the second connection portion 21 </ b> B is provided on the main diagonal 21. It is provided above the center in the longitudinal direction (the other side above and below). More specifically, the first connection portion 21A is provided on the lower side of two locations that divide the overall length of the main diagonal member 21 into approximately three equal parts, and the second connection portion 21B extends the entire length of the main diagonal member 21. It is provided on the upper side of two places that are divided into approximately three equal parts.

  According to the reinforcing structure 1 described above, the first auxiliary diagonal material 41 and the second auxiliary diagonal material 51 are respectively provided at the first connecting portion 21A and the second connecting portion 21B that are two locations along the longitudinal direction of the main diagonal material 21. Since they are connected, when a horizontal force is applied to the framework S (building), a reverse force is applied to the main diagonal 21 from the first auxiliary diagonal 41 and the second auxiliary diagonal 51, and a bending moment is applied. As a result, a shearing force is generated, that is, the main diagonal 21 functions as a bending shear member. At this time, the main diagonal member 21 is reinforced in comparison with the axial force member that bears only the axial force by bending and deforming into an S shape by the force acting from the first auxiliary diagonal member 41 and the second auxiliary diagonal member 51. The horizontal rigidity of the structure 1 is relatively low. In such a reinforcing structure 1, by utilizing the bending deformation of the main diagonal member 21, the horizontal rigidity can be easily adjusted to an appropriate value, and the deformation performance due to the toughness of the main diagonal member 21 can be enhanced. It has become.

  Furthermore, when the damper 3 is connected between the other end of the main diagonal 21 and the central part of the beam G2 on the upper floor, and a horizontal force acts on the framework S (building), the connecting beam 22 and the beam Relative movement occurs with G2, and in accordance with this movement, the viscoelastic body 33 of the damper 3 undergoes shear deformation, thereby absorbing energy. At this time, since the main diagonal 21 is bent and deformed into an S-shape, the bending rigidity is appropriately set, and the axial rigidity of the first auxiliary diagonal 41 and the second auxiliary diagonal 51 is appropriately set. Thus, the movement of the other end portion of the main diagonal member 21, that is, the deformation amount of the viscoelastic body 33 can be adjusted. Therefore, the shear deformation amount (energy absorption amount) of the viscoelastic body 33 is ensured by utilizing the bending deformation of the main diagonal member 21 without excessively increasing the axial rigidity (cross-sectional area) of the main diagonal member 21. Can do.

  In the first embodiment, the reinforcing structure 1 is not limited to the form shown in FIG. 1, and a form shown as a modified example in FIG. 2 can also be adopted. In FIG. 2, the reinforcing structure 1 includes a third connecting member 6 and a fourth connecting member 7 in addition to the main reinforcing body 2, the damper 3, the first connecting member 4 and the second connecting member 5 similar to those described above. Configured.

  One end of the third connecting member 6 is connected to the middle portion of the first sub diagonal member 41, and the other end is connected to the second connecting portion 21 </ b> B of the main diagonal member 21. The third connecting member 6 is made of, for example, 125 mm × 125 mm H-section steel, and is arranged with the strong axis directed in the in-plane direction of the rectangular frame W. The fourth connecting member 7 has one end connected to the middle portion of the second sub diagonal 42 and the other end connected to the first connecting portion 21 </ b> A of the main diagonal 21. The fourth connection member 7 is made of, for example, 125 mm × 125 mm H-section steel, and is arranged with the strong axis directed in the in-plane direction of the rectangular frame W.

  According to the reinforcing structure 1 according to the modification of the first embodiment as described above, the third connecting member 6 can be connected to the middle portion of the first sub-diagonal member 41 while the horizontal rigidity can be adjusted. Since the fourth connecting member 7 is connected to the middle portion of the second sub-diagonal material 51, a bending moment is generated in the first sub-diagonal material 41 and the second sub-diagonal material 51, and these members are By functioning as a bending material, the toughness can be further improved, and the deformation performance can be improved while increasing the rigidity of the reinforcing structure 1.

  Hereinafter, the framework of a building using the reinforcing structure according to the second embodiment of the present invention will be described with reference to FIG. The reinforcing structure 1A of the present embodiment is different in the configuration of the connecting members 4 and 5 (the first connecting member 4 and the second connecting member 5) from the reinforcing structure 1 of the first embodiment. Hereinafter, the differences will be described in detail. In addition, about the same or common structure as 1st embodiment, the same code | symbol may be attached | subjected and the description may be abbreviate | omitted or simplified.

  In the reinforcing structure 1 </ b> A, the first connecting portion 21 </ b> A in which the other end portion of the first auxiliary diagonal member 41 of the first connecting member 4 is connected to the main diagonal member 21 is above the center in the longitudinal direction of the main diagonal member 21 (up and down The second connection portion 21B provided on the other side of the second connecting member 5 is connected to the main diagonal member 21 at the other end of the second sub diagonal member 51 from the center in the longitudinal direction of the main diagonal member 21. It is provided on the lower side (upper and lower one side). Specifically, the first connection portion 21 </ b> A in the present embodiment is provided on the upper side of two locations that divide the entire length of the main diagonal member 21 into approximately three equal parts, and the second connection portion 21 </ b> B is provided on the main diagonal member 21. It is provided on the lower side of two places that divide the entire length into approximately three equal parts.

  Further, the damper 3 of the reinforcing structure 1A exhibits a damping force corresponding to the rocking displacement particularly as a relative movement between the connecting beam 22 and the upper beam G2, and the shear deformation is caused to the viscoelastic body 33 by the rocking displacement. Is configured to occur. In other words, the damper 3 in the present embodiment is preferably a bending damper that absorbs energy by rocking displacement. In the present embodiment, the damper 3 is not limited to the viscoelastic body 33 but may be a metal material such as steel or lead, a high damping rubber, or a viscous material. It may be a thing. Furthermore, the damper 3 is not limited to a bending type damper, and any damper such as a shear type damper, a direct acting type damper, a rotary type damper, a torsion type damper can be used, and an appropriate link mechanism according to the type of the damper. May be configured.

  Similarly to the reinforcing structure 1, the above reinforcing structure 1 </ b> A reverses from the first sub diagonal material 41 and the second sub diagonal material 51 to the main diagonal material 21 when a horizontal force is applied to the framework S (building). When the direction force acts, the main diagonal 21 is bent and deformed into an S shape, so that the horizontal rigidity of the reinforcing structure 1A can be relatively lowered. By utilizing the bending deformation of the main diagonal member 21 in this way, the horizontal rigidity can be easily adjusted to an appropriate value, and the deformation performance due to the toughness of the main diagonal member 21 can be enhanced. Furthermore, energy absorption by the viscoelastic body 33 of the damper 3 is performed by a rocking displacement generated between the other end portion of the main diagonal member 21 and the central portion of the beam G2 on the upper floor. At this time, the amount of deformation of the viscoelastic body 33 can be adjusted by appropriately setting the bending rigidity of the main diagonal member 21 and the axial rigidity of the first auxiliary diagonal member 41 and the second auxiliary diagonal member 51. The amount of energy absorption of the viscoelastic body 33 can be secured by utilizing the bending deformation of 21.

  In the second embodiment, the reinforcing structure 1A is not limited to the form shown in FIG. 3, and a form shown as a modification in FIG. 4 can also be adopted. In FIG. 4, the reinforcing structure 1 </ b> A includes a third connecting member 6 and a fourth connecting member 7 in addition to the main reinforcing body 2, the damper 3, the first connecting member 4 and the second connecting member 5 similar to those described above. Configured. The third connecting member 6 is connected to the middle portion of the first sub diagonal member 41 and the second connecting portion 21B of the main diagonal member 21, and is provided extending vertically. The fourth connecting member 7 is connected to the middle portion of the second sub diagonal member 42 and the first connecting portion 21 </ b> A of the main diagonal member 21, and is provided substantially parallel to the third connecting member 6.

  According to the reinforcing structure 1A according to the modified example of the second embodiment as described above, the third connecting member 6 can be connected to the middle portion of the first auxiliary diagonal member 41 while the horizontal rigidity can be adjusted in the direction of increasing. Since the fourth connecting member 7 is connected to the middle portion of the second sub-diagonal material 51, a bending moment is generated in the first sub-diagonal material 41 and the second sub-diagonal material 51, and these members are By functioning as a bending material, the toughness can be further improved, and the deformation performance can be improved while increasing the rigidity of the reinforcing structure 1.

  According to the above embodiment, the energy absorption performance by the viscoelastic body 33 of the damper 3 can be obtained without excessively increasing the cross-sectional area of the main diagonal member 21 in the reinforcing structures 1 and 1A. The material cost of the material 21 can be suppressed, and the structure for joining the main diagonal 21 to the framework S can be simplified. Further, by bending and deforming the main diagonal member 21, the horizontal rigidity of the entire frame S including the reinforcing structure 1 can be suppressed while improving the deformation performance, and the input acceleration of seismic motion can be reduced. Furthermore, by enhancing the energy absorption effect by the viscoelastic body 33 of the damper 3 using the bending deformation of the main diagonal member 21, the vibration of the building can be reduced and the damage of each part of the building can be suppressed. Performance can be improved.

  Hereinafter, as an example of the present invention, an elastic stress analysis that models the framework S and the reinforcing structures 1 and 1A described in the above embodiment is performed, and as a comparative example, the analysis is compared with an analysis that models the framework S. The elastic stress analysis is a two-dimensional frame analysis in which each member is replaced with a wire, and is performed with the damper 3 omitted.

  In each of the following Examples (Examples 1 to 4) and Comparative Examples, the analysis models of the framework S and the main reinforcing body 2 are common. Specifically, as the framework S, the span between the cores of the left and right columns C was 6 m, and the floor height between the cores of the upper and lower beams G1, G2 was 3.5 m. The column C uses the rigidity of a square steel pipe (cross-sectional dimension: 350 × 350 × 12), and the beam G uses the strong-axis rigidity of an H-section steel (cross-sectional dimension: 400 × 200 × 8 × 13), and the joint J between these columns C and the beam G Was rigid.

  As the main reinforcement 2, the main diagonal 21 uses the strong shaft rigidity of H-shaped steel (cross-sectional dimension: 250 × 125 × 6 × 9), and the connecting beam 22 uses the strong shaft rigidity of H-shaped steel (cross-sectional dimension: 125 × 125 × 6.5 × 9). The main diagonal member 21 and the connecting beam 22 are rigidly connected, and the lower end portion of the main diagonal member 21 is pin-bonded to the framework S. The length of the connecting beam 22 was 600 mm, and the core-to-core distance between the connecting beam 22 and the upper floor beam G2 was 500 mm.

  In Example 1, the reinforcing structure 1 of the first embodiment shown in FIG. 1 is modeled. As the connecting members 4 and 5, the first auxiliary diagonal member 41 and the second auxiliary diagonal member 51 are H-shaped steel. The rigidity of the strong shaft (125 × 125 × 6.5 × 9) was used, and both end portions of each diagonal member were pin-bonded to the framework S and the main diagonal member 21.

  Example 2 models the reinforcing structure 1 of the modified example of the first embodiment shown in FIG. 2, and the connection members 4 and 5 are the same as Example 1, and the third connection member 6 and The four connecting members 7 use the strong shaft rigidity of H-shaped steel (125 × 125 × 6.5 × 9), and both ends of each member are pinned with respect to the main diagonal member 21, the first auxiliary diagonal member 41, and the second auxiliary diagonal member 51. Joined.

  In Example 3, the reinforcing structure 1A of the second embodiment shown in FIG. 3 is modeled. As the connecting members 4 and 5, the first auxiliary diagonal member 41 and the second auxiliary diagonal member 51 are H-shaped steel. The rigidity of the strong shaft (125 × 125 × 6.5 × 9) was used, and both end portions of each diagonal member were pin-bonded to the framework S and the main diagonal member 21.

  Example 4 is a model of the reinforcing structure 1A of the modified example of the second embodiment shown in FIG. 4. The connection members 4 and 5 are the same as those of Example 3, and the third connection member 6 and the first connection member 6 are the same. The four connecting members 7 use the strong shaft rigidity of H-shaped steel (125 × 125 × 6.5 × 9), and both ends of each member are pinned with respect to the main diagonal member 21, the first auxiliary diagonal member 41, and the second auxiliary diagonal member 51. Joined.

  The analysis condition is that the node at the joint J1 position on the lower floor is a fulcrum, each node of the joint J2 and the beam G2 on the upper floor is a rigid floor, and the horizontal displacement of the node on the upper floor is each example (Example) 1-4) and a horizontal load were applied so as to be the same in the comparative example. This horizontal displacement is, for example, 100 mm, and a large deformation state of 1/35 is assumed as the interlayer deformation angle with respect to the floor height.

  5 to 9 show the stress analysis results. FIG. 5 is a diagram illustrating the analysis results of the comparative example, and FIGS. 6 to 9 are diagrams illustrating the analysis results of Examples 1-4. In each figure, (A) is a moment diagram, and (B) is a displacement diagram. In the moment diagram of each figure (A), MC1 is the column base moment of the column C, MC2 is the column head moment of the column C, MG1 is the end moment of the beam G1 on the lower floor, MG2 Is the end moment of the beam G2 on the upper floor.

  6-9, MB1 is a bending moment generated at the first connecting portion 21A of the main diagonal 21 and MB2 is generated at the second connecting portion 21B of the main diagonal 21. Bending moment to be. Further, in FIGS. 7 and 9, MV 1 is a bending moment generated at the connecting portion of the third connecting member 6 in the first sub diagonal material 41, and MV 2 is a connection of the fourth connecting member 7 in the second sub diagonal material 51. This is the bending moment generated in the part.

  Further, in the displacement diagram of each figure (B), D1 is the horizontal displacement of the upper floor, and DX1 and DY1 are the horizontal displacement of the upper end portion (the other end portion) of one (left side in the drawing) of the main diagonal member 21 and It is a vertical displacement, and DX2 and DY2 are the horizontal displacement and the vertical displacement of the upper end portion (the other end portion) of the other (right side in the drawing) main diagonal member 21. Note that the horizontal displacement D1 of the upper floor is set to the same 100 mm in each of the examples (Examples 1 to 4) and the comparative example as in the analysis conditions described above.

  As a stress analysis result, since the horizontal displacement D1 of the upper floor was set to the same 100 mm, the horizontal load in each Example (Examples 1-4) and the comparative example became as follows. The horizontal load of the comparative example was 1060 kN, the horizontal load of Example 1 was 1713 kN, the horizontal load of Example 2 was 2057 kN, the horizontal load of Example 3 was 3143 kN, and the horizontal load of Example 4 was 3482 kN. That is, compared to the comparative example, the horizontal rigidity of 1.62 was obtained in Example 1 in which the reinforcing structure 1 was installed, and the horizontal rigidity was 2.97 times in Example 3 in which the reinforcing structure 1A was installed. Further, in Example 2, the horizontal rigidity was 1.20 times that in Example 1, and in Example 4, the horizontal rigidity was 1.12 times that in Example 3.

  In addition, as bending moments MC1, MC2, MG1, and MG2 generated in the framework S as bending moments of each part, the horizontal displacement is the same, so there is no significant difference between each of the examples (Examples 1 to 4) and the comparative example. Further, in Examples 1 and 2, the bending moments MB1 and MB2 generated in the first connection part 21A and the second connection part 21B of the main diagonal 21 are slightly smaller in Example 2 than in Example 1. . Similarly, in Examples 3 and 4, bending moments MB1 and MB2 were slightly smaller in Example 4 than in Example 3. On the other hand, in Examples 1 and 3, the bending moments MB1 and MB2 were about 1.6 to 2.2 times larger in Example 3 than in Example 1. In Examples 2 and 4, the bending moment MV1 generated in the first auxiliary diagonal material 41 and the bending moment MV2 generated in the second auxiliary diagonal material 51 were both relatively small values.

  In Examples 1 and 2, the horizontal displacements DX1 and DX2 of the upper end portion of the main diagonal member 21 are about −1.0 mm to −2.5 mm, and the vertical displacement DY1 of the upper end portion of the one main diagonal member 21 is about. Is about 1.0 mm, and the vertical displacement DY2 of the upper end portion of the other main diagonal 21 is -3.6 mm to -3.7 mm. That is, in the first and second embodiments, the upper end of the main diagonal 21 is hardly moved and the horizontal displacement D1 of the upper floor is 100 mm. The amount of relative movement with G2 is equivalent to the horizontal displacement D1 (100 mm). Further, the vertical displacements DY1 and DY2 of the upper end portions of the one and the other main diagonal members 21 are rotational displacements of the connecting beam 22, and a displacement angle obtained by dividing the vertical displacements DY1 and DY2 by the length (600mm) of the connecting beam 22. Is a minute value of about 8/1000 (= 1/125).

  On the other hand, in Examples 3 and 4, the horizontal displacements DX1 and DX2 of the upper end portion of the main diagonal member 21 are about 28 mm, and the vertical displacement DY1 of the upper end portion of one main diagonal member 21 is about -23 mm. The vertical displacement DY2 of the upper end portion of the other main diagonal 21 is about 18 mm. That is, in Examples 3 and 4, the relative displacement between the upper end of the main diagonal 21 and the upper beam G2 is about 72 mm obtained by subtracting the horizontal displacements DX1 and DX2 from the horizontal displacement D1 (100 mm). The displacement angle obtained by dividing the vertical displacements DY1, DY2 of the upper end portions of the one and the other main diagonal members 21 by the length of the connecting beam 22 is a value of about −67/1000 (= −1 / 15). The connecting beam 22 is rocked in the opposite direction to the horizontal displacement D1 on the upper floor.

  According to the above-described embodiment, the horizontal rigidity of the framework S is within 1.6 to 2 times the rigidity increase in Embodiments 1 and 2, and 3 to 3 in Embodiments 3 and 4. The rigidity increase is about three times, and the increase rate of rigidity by installing the reinforcing structures 1 and 1A is within a designable range. That is, it has been found that the bending of the main diagonal member 21 can increase the rigidity within a designable range. Further, in Examples 2 and 4 using the third connecting member 6 and the fourth connecting member 7, an increase in rigidity of 1.1 to 1.2 times with respect to Examples 1 and 3 was confirmed, respectively. It has been found that the rigidity adjustment by the connecting member 6 and the fourth connecting member 7 is possible. Furthermore, it was confirmed that by providing the third connecting member 6 and the fourth connecting member 7, the bending moments MB <b> 1 and MB <b> 2 generated in the main diagonal member 21 are reduced and the stress is dispersed.

  Further, in Examples 1 and 2, since the horizontal displacement hardly occurs at the upper end portion of the main diagonal member 21 and the displacement angle of the connecting beam 22 is a minute value, the horizontal displacement D1 of the upper floor is the main diagonal material 21. It has been found that the amount of relative movement with respect to the upper end of each of the two is the amount of shear deformation that occurs in the damper 3. Therefore, in Examples 1 and 2, it was found that by using the shear damper, the damper 3 can be effectively operated to obtain high energy absorption efficiency. On the other hand, in Examples 3 and 4, although the horizontal displacement occurs at the upper end portion of the main diagonal member 21, the displacement angle of the connecting beam 22 occurs in the direction opposite to the horizontal displacement D1 of the upper floor, so that the relative movement due to locking is a damper. 3 was found to occur. Therefore, in Examples 3 and 4, it was found that the energy absorption efficiency of the damper 3 can be increased by using the bending damper.

  In addition, embodiment mentioned above only showed the typical form of this invention, and this invention is not limited to embodiment. That is, various modifications can be made without departing from the scope of the present invention.

  For example, in the above embodiment, the columns C and the beams G are provided with the reinforcing structures 1 and 1A on the steel frame S. However, the frame S is not limited to the steel frame but may be reinforced concrete or steel reinforced concrete. Or a wooden structure (frame structure, frame wall structure, large cross-section laminated wood ramen structure), or the like. Further, the reinforcing structures 1 and 1A of the present invention are not limited to relatively high-rise buildings such as office buildings, commercial buildings, and high-rise houses, but can be applied to low-rise houses, warehouses, school buildings, and the like. Furthermore, the reinforcing structures 1 and 1A of the present invention may be incorporated into a framework when constructing a new building, or can be used as seismic reinforcement to be attached later to an existing building. When used as earthquake-proof reinforcement, the reinforcing structures 1 and 1A may be provided inside the framework S or outside the framework S.

  Moreover, in the said embodiment, although the main reinforcement body 2 of the reinforcement structures 1 and 1A and the 1st-4th connection members 4,5,6,7 were made from steel, not only this but each member was made of wood or bamboo It is good also as a product, You may combine the members made from steel, wooden, and bamboo suitably. Moreover, in the said embodiment, the main reinforcement 2 is formed in the mountain shape, the one end part of the main diagonal 21 is connected to the junction part J1 vicinity of a lower floor, and the other end part is the beam G2 center part of an upper floor. However, the present invention is not limited to this. One end of the main diagonal member 21 is connected to the vicinity of the joint J2 on the upper floor, and the other end extends toward the center of the beam G1 on the lower floor. It may be provided. In this case, a damping member (damper 3) may be connected between the other end portion of the main diagonal 21 and the central portion of the beam G1 on the lower floor.

  FIG. 10 shows an example in which the reinforcing structure 1 is applied to a framework S of a large-section laminated timber ramen structure, which is a wooden building used for a relatively small detached house having two to three floors. . In this framework S, for example, the pillar C is made of a laminated material having a 350 mm square, the lower floor beam G1 (base) is provided on the foundation F, and the upper floor beam G2 is made of a laminated material of 200 mm × 350 mm. . The column C and the beam G are rigidly joined to each other using a joint hardware, bolts, and nuts. The reinforcing structure 1 includes a pair of main diagonal members 21 and a pair of first connecting members 4 (first auxiliary diagonal members 41) and second connecting members 5 (second auxiliary diagonal members 51) made of wood or bamboo laminated material. And is configured. The main diagonal 21 is made of, for example, 200 mm square wood or bamboo laminated material, and the first auxiliary diagonal 41 and the second auxiliary diagonal 51 are made of, for example, 105 mm square wooden or bamboo laminated wood. .

  One end portions of the pair of main diagonal members 21 are connected to each other in the vicinity of the joint portion J1 on the left and right sides of the lower floor via the joint hardware 25, respectively. The other end portions of the pair of main diagonal members 21 are connected to the damper 3 via a bonding plate 24 welded to the flange 31, and the other end portion of the main diagonal member 21 is connected to a bonding plate 24 </ b> A extending from the bonding plate 24 by a bolt. It is fixed. The first sub-diagonal member 41 has one end connected to the upper end of the column C in the vicinity of the joint J2 on the left and right of the upper floor via a joint metal 44, and the other end is an intermediate portion of the main diagonal 21. It is connected to a certain first connecting portion 21 </ b> A via a metal joint 45. One end of the second sub-diagonal member 51 is connected to the central portion of the beam G1 on the lower floor via a joint metal 54, and the other end is joined to the second connecting portion 21B that is an intermediate portion of the main diagonal member 21. It is connected via a hardware 55. Each of the metal fittings 44, 45, 54, and 55 is fixed to the column C, the beam G, the main diagonal member 21, and the auxiliary diagonal member 51 by bolts.

  In the embodiment, in the reinforcing structures 1 and 1A, the first connecting portion 21A is provided in one of the two portions that divide the entire length of the main diagonal member 21 into approximately three equal parts, and the second connecting portion 21B is provided in the other. Although provided, 21 A of 1st connection parts and the 2nd connection part 21B should just be provided in the position mutually separated along the longitudinal direction of the main diagonal 21. That is, the reinforcing structure of the present invention is characterized in that the first connecting member and the second connecting member are connected to two different positions in the main diagonal member, and the main diagonal member is bent and deformed into an S shape by these connecting members. If it is a range which can obtain such an effect | action, the position of a 1st connection part and a 2nd connection part will not be specifically limited. Moreover, as a 1st connection member and a 2nd connection member, it is not restricted to what was comprised with the diagonal material (1st sub-diagonal material 41 and 2nd sub-diagonal material 51) illustrated in the said embodiment, A steel plate panel or concrete You may be comprised with assembly materials, such as surface materials, such as a panel, truss material, and a lattice material.

1, 1A Reinforcement structure 2 Main reinforcement 3 Damper (damping member)
4 first connection member 5 second connection member 6 third connection member 7 fourth connection member 21 main diagonal member 21A first connection portion 21B second connection portion 41 first sub diagonal material 51 second sub diagonal material C column G beam G1 Lower floor beam G2 Upper floor beam J Joint J1 Lower floor joint J2 Upper floor joint S Frame W Rectangular frame

Claims (7)

Provided in a rectangular frame surrounded by left and right columns and upper and lower beams, a reinforcing structure that bears a horizontal force acting on the frame,
Of the four joints at the top, bottom, left, and right where the column and the beam are joined, a pair of ends are connected to the vicinity of the left and right joints on either one of the top and bottom, and extend toward the beam center on the other side The main diagonal,
Attenuation connected to each other end of the pair of main diagonal members and the central portion of the beam on the other side, and exhibiting a damping force according to relative movement between the other end portion of the main diagonal member and the central portion of the beam Members,
A pair of first connection members that respectively connect a part of the framework on the other side and each intermediate portion of the pair of main diagonal members;
A pair of second connection members that respectively connect a part of the beam on the one side and each intermediate portion of the pair of main diagonal members,
In the main diagonal member, the first connection portion to which the first connection member is connected and the second connection portion to which the second connection member is connected are spaced apart from each other along the longitudinal direction of the main diagonal member. A reinforced structure characterized by being provided.   The first connection portion is provided on one side of the longitudinal center of the main diagonal material, and the second connection portion is provided on the other side of the longitudinal center of the main diagonal material. The reinforcing structure according to claim 1.   The said 1st connection part and said 2nd connection part are provided in one side and the other of the two places which respectively divide the length of the said main diagonal material into three substantially equal parts, The 1 or 2 characterized by the above-mentioned. Reinforcement structure as described in. The first connecting member is configured to have a first sub-diagonal material having one end connected to the vicinity of the left and right joints on the other side and the other end connected to the main diagonal.
The second connecting member includes a second sub-diagonal material having one end connected to the beam central portion on the one side and the other end connected to the main diagonal. The reinforcing structure according to any one of claims 1 to 3.   A third connection member that connects the middle part of the first sub-diagonal material and the second connection part, a fourth connection member that connects the middle part of the second sub-diagonal material and the first connection part, The reinforcing structure according to claim 4, further comprising:   The said damping member is comprised from the shear type damper which exhibits damping force by carrying out shear deformation by the relative movement of the other end part of the said main diagonal, and the said other side beam. The reinforcement structure as described in any one of -5. A rectangular framework surrounded by left and right columns and upper and lower beams;
The building provided with the reinforcement structure as described in any one of Claims 1-6 provided in the said framework.

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