Brace structure

Abstract

To provide a brace structure capable of exhibiting high attenuation force while suppressing enlargement.SOLUTION: A brace structure 10A incorporating a vibration control damper 30A comprises: a core material 21A; an outside steel pipe 22A which is provided so as to move relatively to the core material 21A and inside which a cement-based hardening body 24 is provided; and the vibration control damper 30A which is connected with the core material 21A and the cement-based hardening body 24 and comprises a highly attenuating rubber attenuating a relative movement of the core material 21A and the outside steel pipe 22A. The vibration control damper 30A and the core material 21A are fastened by a bolt 40.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a brace structure.

Background Art

[0002] For example, Patent Document 1 discloses a configuration of a vibration damping rib cage material including an outer rib cage member, a steel inner rib cage member disposed in a holding hole of the outer rib cage member, and a viscoelastic material layer interposed between the peripheral surface of the inner rib cage member and the inner peripheral surface of the outer rib cage member. Both side portions of the vibration damping rib cage material having such a configuration are connected to the framework of a building. Further, Patent Document 2 discloses a vibration damping damper including a plurality of three or more steel plates and a viscoelastic body adhered between the steel plates, wherein at least one end of the steel plate is connected to a connecting member on the frame side of a building via an attachment member. In the vibration damping damper, at least one layer of the viscoelastic body adjacent to the attachment member or the connecting member with the steel plate interposed therebetween extends to the side of the attachment member or the connecting member up to a position flush with at least the end surface on the viscoelastic body side of the attachment member or the connecting member. Further, Patent Document 3 discloses a configuration of a vibration damping damper including an inner member attached to one part of a framework of a structure and on which an axial force acts, an outer member attached to the other part of the framework and on which an axial force acts, and a viscoelastic body interposed between the inner member and the outer member. In this configuration, the inner member has a polygonal tubular portion. The outer member has a plurality of strip plates independently arranged opposite to each outer peripheral surface of the tubular portion, a tubular body covering the inner member and the strip plates from the outer surface side, and a filling material that is injected and solidified along the inner surface of the tubular body to integrate the tubular body and the strip plates. The viscoelastic body is a sheet-like viscoelastic body and is interposed with both surfaces in close contact between the outer peripheral surface of the tubular portion and the strip plates.

[0003] The configurations disclosed in Patent Documents 1 to 3 are all brace structures provided with a vibration damping damper using a viscoelastic body. In such a configuration, when attempting to increase the damping force, the vibration damping damper may be lengthened in the axial direction in which the brace extends. However, there is a limit to the range in which the vibration damping damper (viscoelastic body) can be provided on the brace, and problems may occur regarding the accommodation of the vibration damping damper. In addition, when the vibration damping damper becomes longer, there may also be concerns such as a decrease in the amount of energy absorbed due to elastic deformation of the steel part and buckling. Moreover, if ordinary rubber is used as the viscoelastic body, the damping performance may not be fully exhibited. This is because ordinary rubber has a large temperature dependence, and when the temperature rises, mechanical properties such as rigidity and damping performance decrease. Since the temperature of the viscoelastic body can easily rise due to external factors such as air temperature and direct sunlight, depending on the installation environment of the vibration damping damper provided with the viscoelastic body, the viscoelastic body may not be able to efficiently exhibit its damping performance. Alternatively, when an earthquake occurs and the viscoelastic body absorbs vibration energy, the temperature of the viscoelastic body can also rise. Therefore, if the viscoelastic body repeatedly absorbs vibrations during an earthquake, the temperature of the viscoelastic body may rise accordingly, and the damping performance may not be fully exhibited. Therefore, a brace structure that can exhibit a high damping force while suppressing the enlargement of the vibration damping damper is desired.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] The problem to be solved by the present invention is to provide a brace structure that can exhibit high damping force while suppressing an increase in size.

Means for Solving the Problem

[0006] In order to solve the above problems, the present invention employs the following means. That is, the brace structure of the present invention is a brace structure incorporating a vibration damping damper, including a core material, an outer steel pipe provided so as to be relatively movable with respect to the core material and having a cement-based hardened body provided on the inner side, and a vibration damping damper joined to the core material and the cement-based hardened body and including a high-damping rubber that attenuates relative movement between the core material and the outer steel pipe, wherein the vibration damping damper and the core material are fastened with bolts. According to such a configuration, the vibration damping damper is formed including high-damping rubber having high damping performance as a viscoelastic body. Therefore, the damping performance of the vibration damping damper is improved. Further, the high-damping rubber has little temperature dependence, and even when the temperature rises due to external factors such as air temperature and direct sunlight or absorption of vibration energy, the damping performance is less likely to decrease. In this way, by using high-damping rubber as the viscoelastic body of the vibration damping damper realized as a so-called viscoelastic damper, it is possible to increase the damping performance and to stably exhibit the damping performance. Since the damping performance can be efficiently increased in this way, the total amount of the viscoelastic body required to realize the damping performance required for the vibration damping damper is reduced. Therefore, there is a possibility of reducing the length of the vibration damping damper in the axial direction of the brace structure and suppressing an increase in size. Here, although it is not easy to adhere the above-described high-damping rubber to steel materials at a construction site or the like, in the above-described brace structure, the vibration damping damper formed with the high-damping rubber is fastened to the core material with bolts, so that assembly and construction at the construction site are easy. In this way, it becomes possible to provide a brace structure that can exhibit high damping force while suppressing an increase in size.

[0007] In one aspect of the present invention, in the brace structure of the present invention, the core material has a cross-shaped cross section or an H-shaped cross section. The core material includes a plate-like portion, and the vibration damping dampers are respectively provided on both sides of the plate-like portion. Each of the vibration damping dampers and the plate-like portion are joined by bolts passing through them. According to such a configuration, by forming the core material into a cross-shaped cross section or an H-shaped cross section, it becomes possible to provide a plurality of vibration damping dampers in a limited space, and it is possible to exhibit a high damping force while suppressing an increase in the size of the brace structure. Also, when the core material is a steel pipe or the like and has a portion with an annular cross-sectional shape of the core material, when fastening the vibration damping damper to the surface of the core material with bolts, it is necessary to insert a hand from the axial end of the core material inside the annular portion, so assembly and construction are not easy. On the other hand, in the above-described configuration, since it does not have a portion with an annular cross-sectional shape of the core material and has a structure that allows easy external contact with any surface of the core material, it is possible to easily fasten the vibration damping damper to the surface of the core material with bolts. Furthermore, vibration damping dampers are respectively provided on both sides of the plate-like portion constituting the core material, and each of the vibration damping dampers and the plate-like portion are joined by bolts passing through them. That is, since a plurality of vibration damping dampers can be collectively fastened to the core material with one bolt, compared to the case where each vibration damping damper is fastened to the core material with a bolt, the number of bolts used can be reduced, and an increase in the size of the brace structure can be further suppressed.

[0008] In one aspect of the present invention, in the brace structure of the present invention, the vibration damping damper includes a first outer steel plate provided on opposite side surfaces of the high-damping rubber, and a second outer steel plate. The first outer steel plate has an outer edge portion formed so that the outer dimensions are larger than those of the high-damping rubber when the vibration damping damper is viewed in plan, and the outer edge portion is fastened to the core material with the bolt. The second outer steel plate is joined to the cement-based hardened body. According to such a configuration, since the outer dimension of the first outer steel plate is larger than that of the high-damping rubber, the outer edge portion protrudes outward beyond the high-damping rubber. By fastening the outer edge portion to the core material with bolts, the vibration damping damper can be joined to the core material. Further, by joining the second outer steel plate to the cement-based hardened body, the vibration damping damper is joined to the cement-based hardened body. In this way, it becomes possible to configure the high-damping rubber to attenuate the relative movement between the core material and the outer steel pipe.

Effect of the Invention

[0009] According to the present invention, it is possible to provide a brace structure that can exhibit high damping force while suppressing an increase in size.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0011] Hereinafter, with reference to the accompanying drawings, embodiments for implementing the brace structure according to the present invention will be described based on the drawings. [First Embodiment] The configuration of the brace structure according to the embodiment of the present invention is shown in FIG. 1. As shown in FIG. 1, the brace structure 10A according to this embodiment is provided in the column-beam framework 2 that constitutes the frame 1 of the structure. The column-beam framework 2 includes a plurality of columns 3 and beams 4. The plurality of columns 3 are arranged at intervals in the horizontal direction. Each column 3 extends in the vertical direction. The beams 4 are arranged at intervals in the vertical direction. Each beam 4 extends in the horizontal direction and is installed between adjacent columns 3.

[0012] The brace structure 10A is provided between columns 3 adjacent to each other in the horizontal direction and beams 4 positioned above and below each other. The brace structure 10A is provided so as to extend obliquely between two adjacent columns 3 and two beams 4 positioned above and below each other. Both ends of the brace structure 10A are joined to brackets 12 provided at respective first joints J1 and second joints J2 that are joints between the columns 3 and the beams 4. FIG. 2 is a cross-sectional view of the brace structure according to the first embodiment of the present invention as viewed from the axial direction, and is a cross-sectional view taken along the line I-I in FIG. 1. FIG. 3 is a cross-sectional view taken along the line II-II in FIG. 2. As shown in FIGS. 2 and 3, the brace structure 10A mainly includes a core material 21A, an outer steel pipe 22A, and a vibration damping damper 30A. The core material 21A extends in the axial direction Da of the brace structure 10A. One end 21s of the core material 21A is joined to the bracket 12 of the second joint J2. The other end 22t side of the core material 21A is inserted into the outer steel pipe 22A. A gap is formed between the other end 22t and the bracket 12 of the first joint J1 within the outer steel pipe 22A. As shown in FIG. 2, in this embodiment, the cross-sectional shape of the core material 21A perpendicular to the axial direction Da of the brace structure 10A (the direction perpendicular to the paper surface in FIG. 2) is a cross shape. The core material 21A has four plate-like portions 21p extending from the central portion 21c of the cross-section of the core material 21A in four directions. The four plate-like portions 21p are joined to each other.

[0013] As shown in FIG. 3, the outer steel pipe 22A extends in the axial direction Da of the brace structure 10A. One end 22s of the outer steel pipe 22A is joined to the bracket 12 of the first joint J1. The other end 22t of the outer steel pipe 22A has a gap in the axial direction Da from the bracket 12 of the second joint J2. As shown in FIG. 2, in the present embodiment, the outer steel pipe 22A is made of, for example, a circular steel pipe having a circular cross-sectional shape perpendicular to the axial direction Da. On the inner side of the outer steel pipe 22A, a cementitious hardened body 24 is provided. The cementitious hardened body 24 is made of, for example, mortar. The outer steel pipe 22A is fixed to the cementitious hardened body 24. The cementitious hardened body 24 is joined only to the second outer steel plate 32 with respect to the vibration damping damper 30A described later, and a gap S1 is provided between the core material 21A, the viscoelastic body 33 of the vibration damping damper 30A, and the first outer steel plate 31A. With the above configuration, the outer steel pipe 22A is provided so as to be relatively movable with respect to the core material 21A in the axial direction Da of the brace structure 10A, toward the second joint J2, or away from the second joint J2.

[0014] The vibration damping damper 30A attenuates the relative movement between the core material 21A and the outer steel pipe 22A. The vibration damping damper 30A is joined to the core material 21A and the cementitious hardened body 24. In the present embodiment, four vibration damping dampers 30A are provided in the circumferential direction around the central portion 21c of the cross section of the core material 21A. In the present embodiment, each vibration damping damper 30A is disposed between two plate-like portions 21p adjacent to each other in the circumferential direction around the central portion 21c of the cross section of the core material 21A. As a result, in each of the plate-like portions 21p constituting the core material 21A, vibration damping dampers 30A are provided on both sides of the plate-like portion 21p. As shown in FIG. 3, in the present embodiment, the vibration damping damper 30A is provided over the entire region (total length) where the core material 21A and the outer steel pipe 22A overlap in the axial direction Da. The vibration damping damper 30A includes a first outer steel plate 31A, a second outer steel plate 32, and a viscoelastic body 33. The vibration damping damper 30A is configured by laminating the first outer steel plate 31A, the second outer steel plate 32, and the viscoelastic body 33 in a direction orthogonal to the axial direction Da. The first outer steel plate 31A and the second outer steel plate 32 are provided on both sides with the viscoelastic body 33 interposed therebetween. As shown in FIG. 2, the second outer steel plate 32 is provided, for example, at an inclination of 45 degrees with respect to two plate-like portions 21p orthogonal to each other. The second outer steel plate 32 integrally includes a plurality of stud bolts 34 on the surface 32f on the side opposite to the viscoelastic body 33. The surface 32f of the second outer steel plate 32 is in contact with the cement-based hardened body 24 and is fixed to the cement-based hardened body 24. The plurality of stud bolts 34 are embedded in the cement-based hardened body 24. Thereby, the second outer steel plate 32 is joined to the cement-based hardened body 24.

[0015] The first outer steel plate 31A is formed such that when the vibration damping damper 30A is viewed in plan from the lamination direction Ds of the first outer steel plate 31A, the second outer steel plate 32, and the viscoelastic body 33, the outer dimensions are larger than those of the viscoelastic body 33. The first outer steel plate 31A integrally has a substrate portion 31a formed parallel to the second outer steel plate 32 and outer edge portions 31b extending from both ends of the substrate portion 31a along the plate-like portions 21p on both sides. The outer edge portions 31b protrude outside the viscoelastic body 33 when viewed in plan from the lamination direction Ds. In the present embodiment, the outer edge portions 31b extend at an inclination of 45 degrees toward the second outer steel plate 32 side with respect to the substrate portion 31a when viewed from the axial direction Da. The first outer steel plate 31A is provided with the outer edge portions 31b on both sides along the two adjacent plate-like portions 21p. Thereby, a gap S3 (see FIG. 2) is formed between the two adjacent plate-like portions 21p and the first outer steel plate 31A. The outer edge portion 31b is fastened to the core material 21A by bolts 40 and nuts 41. In the present embodiment, the first outer steel plates 31A of the two vibration damping dampers 30A arranged on both sides with each plate-like portion 21p interposed therebetween are fastened by the outer edge portions 31b of both vibration damping dampers 30A, bolts 40 passing through the plate-like portion 21p, and nuts 41. That is, two adjacent vibration damping dampers 30A in the circumferential direction share the bolts 40 and nuts 41.

[0016] The viscoelastic body 33 attenuates the relative movement between the core material 21A and the outer steel pipe 22A in the axial direction Da orthogonal to the lamination direction Ds of the first outer steel plate 31A and the second outer steel plate 32. The viscoelastic body 33 is a high-damping rubber having higher damping performance than ordinary rubber. The viscoelastic body 33 preferably contains at least one rubber material such as acrylic, diene, styrene, or isoprene. In the present embodiment, for example, a rubber material containing isoprene rubber is used as the viscoelastic body 33. Isoprene rubber has a large initial stiffness. Also, isoprene rubber has a small temperature dependence. Therefore, even when the temperature rises due to external factors such as air temperature and direct sunlight or absorption of vibration energy, the damping performance is less likely to decrease. Furthermore, isoprene rubber has a small frequency dependence. The viscoelastic body 33 is manufactured, for example, by mixing synthetic rubber such as isoprene rubber and natural rubber and adding a damping imparting agent, an anti-aging agent, etc. thereto. The vibration damping damper 30A provided with such a viscoelastic body 33 is manufactured in a factory by vulcanizing and bonding the viscoelastic body 33, the first outer steel plate 31A, and the second outer steel plate 32 under predetermined high-temperature and high-pressure conditions. When assembling the brace structure 10A, the pre-manufactured vibration damping damper 30A is attached to the core material 21A by bolts 40 and nuts 41.

[0017] In such a vibration damping damper 30A, the displacement of the core material 21A in the axial direction Da is transmitted to the first outer steel plate 31A via the bolt 40. Further, the displacement of the outer steel pipe 22A in the axial direction Da in the axial direction Da is transmitted to the second outer steel plate 32 via the cement-based hardened body 24 and a plurality of stud bolts 34. The viscoelastic body 33 using high-damping rubber attenuates the relative displacement between the first outer steel plate 31A and the second outer steel plate 32. Thereby, the vibration damping damper 30A attenuates the relative movement between the core material 21A and the outer steel pipe 22A. Therefore, when a tensile force or a compressive force acts on the brace structure 10A, the core material 21A and the outer steel pipe 22A resist, and the core material 21A and the outer steel pipe 22A form a mechanism for transmitting forces to each other by the shearing force of the viscoelastic body 33 and the cement-based hardened body 24 therebetween. Specifically, the core material 21A and the outer steel pipe 22A bear the tensile force and the compressive force. The shearing force is transmitted between the core material 21A and the viscoelastic body 33 via the bolt 40, and the shearing force is transmitted between the viscoelastic body 33 and the cement-based hardened body 24 via the stud bolt 34. Further, the shearing force is transmitted between the cement-based hardened body 24 and the outer steel pipe 22A by the adhesive force. Further, the cement-based hardened body 24 resists as a buckling restraint material for the core material 21A and the outer steel pipe 22A. The same applies to the brace structures of the respective modified examples to be described in detail after this embodiment.

[0018] The brace structure 10A as described above includes a vibration damping damper 30A incorporated therein, a core material 21A, an outer steel pipe 22A provided so as to be relatively movable with respect to the core material 21A and having a cement-based hardened body 24 provided on the inner side, and a vibration damping damper 30A joined to the core material 21A and the cement-based hardened body 24 and including a viscoelastic body (high-damping rubber) 33 that attenuates the relative movement between the core material 21A and the outer steel pipe 22A. The vibration damping damper 30A and the core material 21A are fastened with bolts 40. According to such a configuration, the viscoelastic body 33 of the vibration damping damper 30A is a high-damping rubber having high damping performance. Therefore, the damping performance of the vibration damping damper 30A is improved. Further, the high-damping rubber has less temperature dependence than ordinary rubber, and even when the temperature rises due to external factors such as air temperature and direct sunlight, or absorption of vibration energy, etc., the damping performance is less likely to decrease. Thus, by using the viscoelastic body 33 of the vibration damping damper 30A, which is realized as a so-called viscoelastic damper, as the high-damping rubber, it is possible to enhance the damping performance and to achieve a configuration in which the damping performance can be stably exhibited. Since the damping performance can be efficiently enhanced in this way, the total amount of the viscoelastic body 33 required to realize the damping performance required for the vibration damping damper 30A is reduced. Therefore, there is a possibility of reducing the length of the vibration damping damper 30A in the axial direction Da of the brace structure 10A and suppressing the enlargement. Here, although it is not easy to adhere the above-mentioned high-damping rubber to steel materials at a construction site, etc., in the above-mentioned brace structure 10A, the vibration damping damper 30A formed with the high-damping rubber is bolted to the core material 21A by bolts 40. Since it is constructed by fastening, assembly and construction at the construction site are also easy. In this way, it is possible to provide the brace structure 10A that can exhibit a high damping force while suppressing enlargement.

[0019] Generally, high-damping rubber is often manufactured and sold as a unit by vulcanizing and adhering it to a steel plate under predetermined high-temperature and high-pressure conditions in a factory. Therefore, it is difficult to procure it as a single body not adhered to a steel plate, process it into an arbitrary shape, and adhere it to a core material to form a vibration damping damper. Even if it were possible to procure the high-damping rubber as a single body, dedicated equipment would be required to vulcanize and adhere it to the core material 21A, for example, so assembly at the construction site is not easy. On the other hand, in the present embodiment, since the vibration damping damper 30A and the brace structure 10A can be constructed by fastening the high-damping rubber manufactured as a unit to the core material 21A with bolts, assembly and construction at the construction site become easy as described above.

[0020] Further, the core member 21A has a cross-shaped cross section, the core member 21A includes a plate-shaped portion 21p, vibration damping dampers 30A are respectively provided on both sides of the plate-shaped portion 21p, and each of the vibration damping dampers 30A and the plate-shaped portion 21p are joined by bolts 40 penetrating them. According to such a configuration, four vibration damping dampers 30A can be incorporated between the four plate-shaped portions 21p constituting the core member 21A. In this way, it becomes possible to provide a plurality of vibration damping dampers 30A in a limited space, and it becomes possible to exhibit a high damping force while suppressing the enlargement of the brace structure 10A. Also, when the core member 21A is a steel pipe or the like and has a portion with an annular cross-sectional shape of the core member 21A, when fastening the vibration damping damper 30A to the surface of the core member 21A with bolts 40, it is necessary to insert a hand from the end of the core member 21A in the axial direction Da inside the annular portion. Therefore, assembly and construction are not easy. On the other hand, in the above-described configuration, since the core member 21A does not have a portion with an annular cross-sectional shape and has a structure that can be easily contacted from the outside on any surface of the core member 21A, the vibration damping damper 30A can be easily fastened to the surface of the core member 21A with bolts 40. Furthermore, vibration damping dampers 30A are respectively provided on both sides of the plate-shaped portion 21p constituting the core member 21A, and each of the vibration damping dampers 30A and the plate-shaped portion 21p are joined by bolts 40 penetrating them. That is, since a plurality of vibration damping dampers 30A can be collectively fastened to the core member 21A with one bolt 40, compared with the case where each vibration damping damper 30A is fastened to the core member 21A with a bolt 40, the number of bolts 40 used can be reduced, and the enlargement of the brace structure 10A can be more suppressed.

[0021] Further, the vibration damping damper 30A includes a first outer steel plate 31A provided on opposite side surfaces of the viscoelastic body (high-damping rubber) 33, and a second outer steel plate 32. The first outer steel plate 31A has an outer edge portion 31b formed so that its outer dimensions are larger than those of the viscoelastic body (high-damping rubber) 33 when the vibration damping damper 30A is viewed in plan. The outer edge portion 31b is fastened to the core material 21A by bolts 40, and the second outer steel plate 32 is joined to the cement-based hardened body 24. According to such a configuration, since the outer dimensions of the first outer steel plate 31A are larger than those of the viscoelastic body (high-damping rubber) 33, the outer edge portion 31b protrudes outward from the viscoelastic body (high-damping rubber) 33. By fastening the outer edge portion 31b to the core material 21A with bolts 40, the vibration damping damper 30A can be joined to the core material 21A. Also, by joining the second outer steel plate 32 to the cement-based hardened body 24, the vibration damping damper 30A is joined to the cement-based hardened body 24. In this way, it becomes possible to configure the viscoelastic body 33 to attenuate the relative movement between the core material 21A and the outer steel pipe 22A.

[0022] (Modification of the First Embodiment) Note that the brace structure of the present invention is not limited to the above-described first embodiment described with reference to the drawings, and various modifications can be considered within its technical scope. For example, in the above embodiment, the outer steel pipe 22A is made of a circular steel pipe having a circular cross-sectional shape perpendicular to the axial direction Da, but it is not limited to this. FIG. 4 is a cross-sectional view showing the configuration of a modification of the brace structure according to the first embodiment of the present invention. As shown in FIG. 4, the outer steel pipe 22B constituting the brace structure 10A may be made of, for example, an angle steel pipe having a rectangular cross-sectional shape perpendicular to the axial direction Da of the brace structure 10A. In this case, the outer steel pipe 22B is provided outside each plate-like portion 21p of the core material 21A having a cross shape so that the corner portions 22p are located. FIG. 5 is a cross-sectional view showing the configuration of another modification of the brace structure according to the first embodiment of the present invention. As shown in FIG. 5, an outer steel pipe 22C made of an angle steel pipe having a rectangular cross-sectional shape orthogonal to the axial direction Da may be provided outside each plate-like portion 21p of the core material 21A having a cruciform cross-section so that the four flat portions 22q are positioned.

[0023] [Second Embodiment] Next, a brace structure according to a second embodiment of the present invention will be described. In the second embodiment described below, the difference from the first embodiment is that in the first embodiment, the core material 21A has a cruciform cross-section, whereas in the second embodiment, the core material 21B has a composite cross-section (H-shaped cross-section) in which C-shaped steel materials are installed back to back. In the following description, components common to the first embodiment are denoted by the same reference numerals in the drawings, and detailed description thereof is omitted.

[0024] A cross-sectional view showing the configuration of the brace structure according to the second embodiment of the present invention is shown in FIG. 6. As shown in FIG. 6, the brace structure 10B in the present embodiment mainly includes a core material 21B, an outer steel pipe 22C, and a vibration damping damper 30B. In this embodiment, the core material 21B has a composite cross-section (H-shaped cross-section) in which the cross-sectional shape orthogonal to the axial direction Da (see FIG. 1) of the brace structure 10B is formed by placing C-shaped steel materials 25 back to back. Specifically, each C-shaped steel material 25 constituting the core material 21B has a web 25a and a pair of flanges 25b. The web 25a is formed along a plane including the axial direction Da (the direction orthogonal to the plane of FIG. 6) and the first direction D1 orthogonal to the axial direction Da. The pair of flanges 25b extend parallel to the second direction D2 orthogonal to the axial direction Da and the first direction D1 from both ends of the web 25a in the first direction D1. Thereby, the C-shaped steel material 25 has a C-shaped cross-section when viewed from the axial direction Da. The core material 21B is arranged by overlapping the webs 25a of the pair of C-shaped steel materials 25 in the second direction D2. The core material 21B is configured such that the flanges 25b of the pair of C-shaped steel materials 25 protrude from both sides in the second direction D2 from the overlapped webs 25a. That is, one C-shaped steel material 25 and the other C-shaped steel material 25 have different directions in which the pair of flanges 25b extend from the web 25a. In this way, the core material 21B has a composite cross-section in which the webs 25a of the C-shaped steel materials 25 are overlapped and placed back to back. Thereby, the core material 21B is formed so as to have an H-shaped cross-section as a whole. The cementitious hardened body 24 provided inside the outer steel pipe 22C is joined only to the second outer steel plate 32 with respect to the vibration damping damper 30B described later, and a gap S2 is provided between the core material 21B, the viscoelastic body 33 of the vibration damping damper 30B, and the first outer steel plate 31B.

[0025] In this embodiment, the vibration damping damper 30B is arranged on each of the pair of C-shaped steel materials 25 constituting the core material 21B. The vibration damping damper 30B is arranged on both sides with the web (plate-like portion) 25a of the pair of C-shaped steel materials 25 interposed therebetween. Each vibration damping damper 30B includes a first outer steel plate 31B, a second outer steel plate 32, and a viscoelastic body 33. The vibration damping damper 30B is configured by laminating the first outer steel plate 31B, the second outer steel plate 32, and the viscoelastic body 33. The vibration damping damper 30B is arranged along the web 25a of the C-shaped steel member 25 with the first outer steel plate 31B. The vibration damping damper 30B is housed between a pair of flanges 25b of the C-shaped steel member 25. That is, the vibration damping damper 30B is arranged in a portion surrounded by the web 25a and the pair of flanges 25b of the C-shaped steel member 25.

[0026] When the first outer steel plate 31B is viewed in plan from the lamination direction Ds of the first outer steel plate 31B, the second outer steel plate 32, and the viscoelastic body 33, the first outer steel plate 31B is formed so that its outer dimensions are larger than those of the viscoelastic body 33. The first outer steel plate 31B integrally has an outer edge portion 31d extending on both sides in the first direction D1 with respect to the viscoelastic body 33. The outer edge portion 31d is fastened to the core material 21B by bolts 40 and nuts 41. In the present embodiment, the first outer steel plates 31B of the two vibration damping dampers 30B arranged on both sides with the web 25a interposed therebetween are fastened by bolts 40 and nuts 41 that penetrate the outer edge portion 31d of both vibration damping dampers 30B and the web 25a. That is, between the two vibration damping dampers 30B arranged on both sides with the web (plate-shaped portion) 25a of the pair of C-shaped steel members 25 interposed therebetween, the bolts 40 and the nuts 41 are shared. The second outer steel plate 32 integrally includes a plurality of stud bolts 34. The second outer steel plate 32 is in contact with the cement-based hardened body 24 and is fixed to the cement-based hardened body 24. The plurality of stud bolts 34 are embedded in the cement-based hardened body 24. Also in the present embodiment, the viscoelastic body 33 is a high-damping rubber having higher damping performance than ordinary rubber, similar to the first embodiment.

[0027] The brace structure 10B as described above includes a vibration damping damper 30B, a core material 21B, an outer steel pipe 22C provided so as to be relatively movable with respect to the core material 21B and having a cement-based hardened body 24 provided on the inner side, and a viscoelastic body (high-damping rubber) 33 joined to the core material 21B and the cement-based hardened body 24 and damping the relative movement between the core material 21B and the outer steel pipe 22C. The vibration damping damper 30B and the core material 21B are fastened by bolts 40. According to such a configuration, the viscoelastic body 33 of the vibration damping damper 30B is a high-damping rubber having high damping performance. Therefore, the damping performance of the vibration damping damper 30B is improved. Further, the high-damping rubber has less temperature dependence than ordinary rubber, and even when the temperature rises due to external factors such as air temperature and direct sunlight, or absorption of vibration energy, etc., the damping performance is less likely to decrease. Thus, by using the high-damping rubber as the viscoelastic body 33 of the vibration damping damper 30B realized as a so-called viscoelastic damper, it is possible to increase the damping performance and to achieve a configuration in which the damping performance can be stably exhibited. Since the damping performance can be efficiently increased in this way, the total amount of the viscoelastic body 33 required to realize the damping performance required for the vibration damping damper 30B is reduced. Therefore, there is a possibility that the length of the vibration damping damper 30B in the axial direction Da of the brace structure 10B can be reduced, and the enlargement can be suppressed. Here, although it is not easy to adhere the above-mentioned high-damping rubber to steel materials at a construction site or the like, in the brace structure 10B as described above, the vibration damping damper 30B formed with the high-damping rubber is bolted to the core material 21B with bolts 40. Therefore, assembly and construction at the construction site are also easy. In this way, it is possible to provide the brace structure 10B that can exhibit a high damping force while suppressing enlargement.

[0028] Further, the core material 21B has an H-shaped cross section, the core material 21B includes a plate-like portion 25a, vibration damping dampers 30B are respectively provided on both sides of the plate-like portion 25a, and each of the vibration damping dampers 30B and the plate-like portion 25a are joined by bolts 40 passing through them. According to such a configuration, the vibration damping dampers 30B can be incorporated on both sides of the plate-like portion 25a inside the C-shaped steel material 25 constituting the H-shaped cross section. In this way, it is possible to provide a plurality of vibration damping dampers 30B in a limited space, and it is possible to exhibit a high damping force while suppressing the enlargement of the brace structure 10B. In addition, when the core material 21B is a steel pipe or the like and has a portion with an annular cross-sectional shape, when fastening the vibration damping damper 30B to the surface of the core material 21B with bolts 40, it is necessary to insert a hand from the end of the core material 21B in the axial direction Da inside the annular portion, so assembly and construction are not easy. On the other hand, in the above-described configuration, since the core material 21B does not have a portion with an annular cross-sectional shape and has a structure that allows easy external contact with any surface of the core material 21B, the vibration damping damper 30B can be easily fastened to the surface of the core material 21B with bolts 40. Furthermore, vibration damping dampers 30B are respectively provided on both sides of the plate-shaped portion 25a constituting the core material 21B, and each of the vibration damping dampers 30B and the plate-shaped portion 25a are joined by bolts 40 that penetrate them. That is, since a plurality of vibration damping dampers 30B can be collectively fastened to the core material 21B with one bolt 40, compared with the case where each vibration damping damper 30B is fastened to the core material 21B with a bolt 40, the number of bolts 40 used can be reduced, and the enlargement of the brace structure 10B can be further suppressed.

[0029] The vibration damping damper 30B includes a first outer steel plate 31B provided on opposite side surfaces of a viscoelastic body (high-damping rubber) 33, and a second outer steel plate 32. The first outer steel plate 31B has an outer edge portion 31d formed so that the outer dimensions are larger than those of the viscoelastic body (high-damping rubber) 33 when the vibration damping damper 30B is viewed in plan view. The outer edge portion 31d is fastened to the core material 21B with bolts 40, and the second outer steel plate 32 is joined to the cement-based hardened body 24. According to such a configuration, since the first outer steel plate 31B has larger outer dimensions than the viscoelastic body (high-damping rubber) 33, the outer edge portion 31d protrudes outward from the viscoelastic body (high-damping rubber) 33. By fastening the outer edge portion 31d to the core material 21B with bolts 40, the vibration damping damper 30B can be joined to the core material 21B. Also, by joining the second outer steel plate 32 to the cement-based hardened body 24, the vibration damping damper 30B is joined to the cement-based hardened body 24. In this way, it becomes possible to configure the viscoelastic body 33 to attenuate the relative movement between the core material 21B and the outer steel pipe 22B.

[0030] (Other Modifications) In the above-described first and second embodiments, the vibration damping dampers 30A and 30B are provided over the entire region (entire length) where the core materials 21A and 21B and the outer steel pipes 22A to 22C overlap in the axial direction Da. However, the present invention is not limited to this. The vibration damping dampers 30A and 30B may be provided only in a part of the region where the core materials 21A and 21B and the outer steel pipes 22A to 22C overlap in the axial direction Da. Further, a plurality of vibration damping dampers 30A and 30B may be provided at intervals in the axial direction Da in the region where the core materials 21A and 21B and the outer steel pipes 22A to 22C overlap in the axial direction Da. Also, as the brace structures 10A and 10B, vibration damping dampers 30A and 30B that attenuate relative movement between the core materials 21A and 21B and the outer steel pipes 22A to 22C are provided between the core materials 21A and 21B and the outer steel pipes 22A to 22C. However, in addition to the vibration damping dampers 30A and 30B, other damping mechanisms may be provided. For example, in addition to the vibration damping dampers 30A and 30B, a configuration may be adopted in which a sliding mechanism and an elastic spring are provided in series, and a buckling restraint member that restrains buckling of the core materials 21A and 21B is provided as an elastoplastic damper. Also, in the above-described second embodiment, by installing the C-shaped steel materials 25 back to back, the core material 21B having an H-shaped cross section as a whole is formed. However, the present invention is not limited to this. For example, when constructing the vibration damping damper 30B as described in the second embodiment, an H-shaped steel material may be used as the core material 21B. Alternatively, the core material does not necessarily have a cruciform cross section or an H-shaped cross section. The core material only needs to have a cross-sectional shape that allows the vibration damping damper to be easily fastened with bolts. In addition to this, as long as the gist of the present invention is not deviated from, it is possible to select and combine the configurations described in the above embodiments, or to appropriately change them to other configurations.

Description of Reference Numerals

[0031] 10A, 10B Brace Structure 30A, 30B Vibration Damping Damper 21A, 21B Core Material 31A, 31B First Outer Steel Plate 21p Plate-Like Portion 31b, 31d Outer Edge Portion Outer steel pipe 32 of 22A to 22C, second outer steel plate Cementitious hardened body 33, viscoelastic body (high-damping rubber) C-shaped steel 40, bolt Web (plate-like part) 25a

Claims

[Claim 1] A brace structure with a built-in vibration damper, A core material; An outer steel pipe having a cement-based hardened body provided on an inner side thereof, the outer steel pipe being provided so as to be movable relative to the core material; a vibration damper which is joined to the core material and the cement-based hardened body and has high damping rubber that damps relative movement between the core material and the outer steel pipe; The vibration damper includes a first outer steel plate and a second outer steel plate provided on opposite sides of the high damping rubber, and the high damping rubber, the first outer steel plate, and the second outer steel plate are laminated and vulcanized / bonded to each other to form a unit. the first outer steel plate has an outer edge portion formed so as to protrude outward from the side surface of the high damping rubber, the outer edge portion and the core material are fastened with bolts, and the second outer steel plate is joined to the cement-based hardened body, The core material has a cross-shaped cross section, The core material includes four plate-like portions extending in all directions from a central portion of the cross section when viewed in a cross section perpendicular to the axial direction, A plurality of the vibration dampers are provided, and in each of the plurality of vibration dampers, a pair of the outer edge portions are provided with the high damping rubber therebetween, and each of the pair of the outer edge portions is provided so as to incline toward the second outer steel plate, The vibration dampers are disposed between the adjacent plate-like portions in the circumferential direction around the central portion of the cross section of the core material such that each of the pair of outer edge portions is provided along each of the adjacent plate-like portions in the circumferential direction, so that the vibration dampers are provided on both sides of each of the plurality of plate-like portions, A brace structure characterized in that, in each of the plate-shaped portions, the first outer steel plates of each of the vibration dampers arranged on both sides of the plate-shaped portion are fastened to each other by the bolts that penetrate the plate-shaped portion and each of the outer edge portions provided along the plate-shaped portion.

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