Vibration-damping studs

Abstract

To provide a damping stud in which an axial force acting on a column barely acts on a shear yielding part which is shear deformed.SOLUTION: A damping stud 20 comprises: a steel upper stud 22 joined to the upper side beam (upper beam 10 A); a steel lower stud 24 joined to the lower side beam (lower beam 10 B) below the upper stud 22 and arranged apart from the upper stud 22; a shear yield part 30 which is joined to the lower end surface of the upper stud 22 and the upper end surface of the lower stud 24 and has a shear yield force smaller than that of a steel material constituting the upper stud 22 and the lower stud 24; and an axial force transmission rib 40 which is provided from the upper stud 22 to the lower stud 24 and transmits an axial force acting on the upper stud 22 to the lower stud 24.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to vibration-damping studs. [Background technology]

[0002] The following Patent Document 1 shows a bending column damper in which a shear panel is attached between a bending column made of H-shaped steel separated into upper and lower halves. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-133433 A Summary of the Invention [Problem to be solved by the invention]

[0004] The bending column damper of Patent Document 1 functions as a seismic damper by the yielding of the shear panel during an earthquake. During an earthquake, the bending column damper is subjected to axial force in addition to shear force. Therefore, there is a possibility that the shear panel will buckle due to the axial force and will not be able to fully exert its shear strength.

[0005] In consideration of the above, an object of the present invention is to provide a vibration-damping stud in which the axial force acting on the column is unlikely to act on the shear yielding portion that undergoes shear deformation. [Means for solving the problem]

[0006] The vibration-damping stud of claim 1 comprises a steel upper stud joined to an upper beam and equipped with a base plate at its lower end, a steel lower stud joined to a lower beam below the upper stud, disposed at a distance from the upper stud and equipped with a top plate at its upper end, a shear yielding portion joined to the lower end surface of the upper stud and the upper end surface of the lower stud and having a shear yield strength smaller than that of the steel material constituting the upper stud and the lower stud, and a portion disposed above the base plate, the lower end of which is welded to the upper end surface of the base plate and below the top plate. an axial force transmission rib, which is provided from above the base plate to below the top plate in parallel with the flanges of the upper stud and the lower stud, and which transmits the axial force acting on the upper stud to the lower stud, an upper end of a portion disposed between the base plate and the top plate being welded to the lower end surface of the top plate, an upper end of a portion disposed between the base plate and the top plate being welded to the lower end surface of the base plate, and a lower end of a portion disposed between the base plate and the top plate being welded to the upper end surface of the top plate, The portion located above the base plate is welded to the web of the upper partition along the vertical direction, and the portion located below the top plate is welded to the web of the lower partition along the vertical direction.

[0007] According to the vibration-damping stud of claim 1, a shear yielding portion is disposed between the upper stud joined to the upper beam and the lower stud joined to the lower beam. Therefore, when the upper stud and the lower stud are displaced relative to each other in the lateral direction during an earthquake, a shear force acts on the shear yielding portion. The shear yielding section has a smaller shear yield strength than the steel material that constitutes the upper and lower studs. Therefore, the shear yielding section undergoes shear deformation before the upper and lower studs, and is therefore able to absorb earthquake energy.

[0008] In addition, this vibration-damping stud has an axial force transmission rib that extends from the upper stud to the lower stud. During an earthquake, vertical axial forces act on the upper and lower studs due to vertical and horizontal shaking, but the axial force is transmitted between the upper and lower studs via the axial force transmission rib. This prevents the axial force from being input to the shear yielding section.

[0009] Therefore, the shear yielding portion is less likely to buckle due to axial force, which makes it easier for the shear yielding portion to absorb earthquake energy through shear deformation. The vibration-damping stud of claim 2 is the vibration-damping stud of claim 1, wherein the axial force transmission rib is a portion disposed above the base plate. 、2 The upper rib of the book and the part arranged below the top plate 、2 The upper stud has a lower rib, and as a portion located between the base plate and the top plate, two central ribs welded to the lower end surface of the upper stud and the upper end surface of the lower stud, and the shear yield portion is provided between the two central ribs. The vibration-damping stud of claim 3 is the vibration-damping stud of claim 1, wherein the shear yielding portion comprises a plate-shaped panel extending along the in-plane direction of a column-beam structure including the beam, a first reinforcing member extending along the horizontal direction and arranged in contact with one face of the panel, and a second reinforcing member extending along the vertical direction and arranged in contact with the other face of the panel.

[0010] Claim 4 In the vibration-damping stud described in claim 1, the upper stud is rigidly connected to the upper beam and the lower stud is rigidly connected to the lower beam, and the shear yield portion is located at a position including an intermediate height between the upper beam and the lower beam.

[0011] When the upper and lower beams are displaced relative to each other during an earthquake, a bending moment acts on the vibration-damping studs. The upper studs are rigidly connected to the upper beams, and the lower studs are rigidly connected to the lower beams. Therefore, the bending moment acting on the vibration-damping studs is smallest at the midpoint between the upper and lower beams.

[0012] Claim 4 In the vibration-damping studs, the shear yielding parts are located at the positions where the bending moment is smallest. Therefore, bending moment is unlikely to act on the shear yielding parts. This makes it easier for the shear yielding parts to shear deform and absorb earthquake energy.

[0013] Claim 5 In the vibration-damping stud according to claim 1 or 2, the shear yielding portion undergoes shear yielding when an external force greater than the primary design seismic force of the building occurs.

[0014] Claim 5 In vibration-damping studs, the shear yielding parts do not shear yield when subjected to external forces below the building's primary design seismic force. In other words, even if internal stresses below the stress calculated by the building's allowable stress calculations occur in the vibration-damping studs, the shear yielding parts do not shear yield and maintain their elasticity. This allows the vibration-damping studs to function as earthquake-resistant members in small- to medium-sized earthquakes, and as vibration-damping members in large-scale earthquakes. Effect of the Invention

[0015] According to the present invention, the axial force acting on the vibration-damping stud is unlikely to act on the shear yielding portion that undergoes shear deformation. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2 is an elevational view of a vibration-damping stud according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a perspective view showing a shear yielding portion in a vibration-damping stud according to an embodiment of the present invention. [Diagram 3] FIG. 2 is an elevational view showing a method for installing a vibration-damping stud according to an embodiment of the present invention. [Figure 4] 1A is an elevation view showing a modified example of a vibration-damping stud according to an embodiment of the present invention, in which the upper end and main body of the upper stud are integrally formed, and the lower end and main body of the lower stud are integrally formed, and FIG. 1B is an elevation view showing a modified example of (A) in which a joining plate is further provided. [Diagram 5] FIG. 11 is an elevation view showing a modified example in which flanges of an upper stud and a lower stud are used as axial force transmission ribs in a vibration-damping stud according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] The vibration-damping stud 20 according to the embodiment of the present invention will be described below with reference to the drawings. Components indicated by the same reference numerals in each drawing are the same components. However, unless otherwise specified in the specification, each component is not limited to one, and may be present in multiple numbers. Also, explanations of configurations and reference numerals that are duplicated in each drawing may be omitted. Note that the present invention is not limited to the following embodiment, and may be implemented with appropriate modifications, such as omitting configurations or replacing them with different configurations, within the scope of the purpose of the present invention.

[0018] Fig. 1 shows a vibration-damping stud 20 (hereinafter referred to as stud 20) according to an embodiment of the present invention. The stud 20 is a stud joined to each of the vertically adjacent beams 10 (upper beam 10A and lower beam 10B) in a building with a column-and-beam frame. The stud 20 is designed not to support a long-term load.

[0019] 1 is a direction (horizontal direction) that coincides with the installation direction of the beam 10, and the direction (vertical direction) that coincides with the extension direction of the stud 20. The X direction and the Z direction are both directions along the in-plane direction of the column-beam frame including the beam 10.

[0020] The upper beam 10A and the lower beam 10B are adjacent H-shaped steel beams on the same structural plane. The upper beam 10A is the upper beam, and the lower beam 10B is the lower beam. The upper beam 10A and the lower beam 10B may be made of reinforced concrete or steel-reinforced concrete.

[0021] <Vibration-damping studs> Studs 20 are comprised of upper studs 22 and lower studs 24, each of which is made of H-shaped steel, which is ordinary steel. Upper stud 22 is rigidly joined to upper beam 10A and protrudes downward from upper beam 10A. Similarly, lower stud 24 is rigidly joined to lower beam 10B and protrudes upward from upper beam 10A. Upper stud 22 and lower stud 24 are disposed at the same position in a plan view.

[0022] (Upper stud) The upper stud 22 has an upper end 22A (so-called bracket) that is integrated with the upper beam 10A, and a main body 22B that is joined to the upper end 22A using a splice plate P. The splice plate P joins the flanges and webs of the upper end 22A and main body 22B, respectively. A base plate 22C is joined to the lower end of the main body 22B. The base plate 22C is welded to each of the web and flanges of the main body 22B.

[0023] (Lower stud) Similarly, the lower stud 24 has a lower end 24A (so-called bracket) that is integrated with the lower beam 10B, and a main body 24B that is joined to the lower end 24A using a splice plate P. The splice plate P joins the flanges and webs of the lower end 24A and main body 24B to each other. A top plate 24C is joined to the upper end of the main body 24B. The top plate 24C is welded to each of the web and flange of the main body 24B, and is disposed spaced apart in the vertical direction from the base plate 22C. In other words, the upper stud 22 and the lower stud 24 are disposed spaced apart in the vertical direction.

[0024] (Axial force transmission rib) The axial force transmission rib 40 is a reinforcing material provided from the upper stud 22 to the lower stud 24, which are arranged at a distance in the vertical direction. The axial force transmission rib 40 transmits axial force between the upper stud 22 and the lower stud 24. This axial force is the axial force that acts during an earthquake.

[0025] The axial force transmission rib 40 is configured to include an upper rib 42, a lower rib 44, and a center rib 46. In addition, the axial force transmission rib 40 is formed using the same steel material as the steel material forming the upper studs 22 and the lower studs 24.

[0026] The upper rib 42 is provided along the Z direction, and is welded to the web of the main body portion 22B and the base plate 22C of the upper stud 22. Two upper ribs 42 are provided spaced apart in the X direction (two when the column-beam frame is viewed from the front). The upper ribs 42 are also provided on both sides of the web of the main body portion 22B (i.e., a total of four).

[0027] The lower rib 44 is provided along the Z direction, and is welded to the web and top plate 24C of the main body 24B of the lower stud 24. Two lower ribs 44 are provided spaced apart in the X direction (two when the column-beam frame is viewed from the front). The lower ribs 44 are also provided on both sides of the web of the main body 24B (i.e., a total of four).

[0028] The central rib 46 is provided along the Z direction, and is welded to the base plate 22C of the upper stud 22 and the top plate 24C of the lower stud 24. Two central ribs 46 are provided and spaced apart in the X direction.

[0029] The upper rib 42, the lower rib 44 and the central rib 46 are located at the same position in the X direction. That is, the upper rib 42, the lower rib 44 and the central rib 46 are each disposed on an extension line of the other in the Z direction.

[0030] (Shear yielding section) A shear yield portion 30 is formed between the base plate 22C and the top plate 24C. The shear yield portion 30 is also provided between two central ribs 46.

[0031] The shear yield portion 30 is provided at a position including an intermediate height between the upper beam 10A and the lower beam 10B (a position straddling the center line CL).

[0032] 2, the shear yielding section 30 is configured to include a panel 32 and reinforcing members 34, 36. In order to explain the configuration of the shear yielding section 30, the upper stud 22 is not shown in FIG.

[0033] The panel 32 is a plate-like member arranged along the X direction and Z direction (in other words, the in-plane direction of the column-beam structure) at a position passing through the axis of the studs 20 (upper studs 22 and lower studs 24), and is formed using steel material having a smaller shear yield strength than the steel material forming the upper studs 22 and lower studs 24.

[0034] Additionally, the upper and lower end faces of the panel 32 are welded to the base plate 22C and the top plate 24C, respectively. In other words, the panel 32 is joined to the lower end face of the upper stud 22 and the upper end face of the lower stud 24, for example, by welding. A shear force is input to the panel 32 when the upper beam 10A and the lower beam 10B are displaced relative to each other. The panel 32 will yield in shear when an external force greater than the primary design seismic force of the building occurs.

[0035] In this embodiment, panel 32 is made of a steel material (e.g., low yield point steel) that has a lower shear yield “stress” than the steel material forming upper stud 22 and lower stud 24. However, the embodiment of the present invention is not limited to this.

[0036] For example, a steel material having the same shear yield stress as the steel material forming the upper stud 22 and the lower stud 24 may be used for the panel 32. In this case, by making the thickness of the panel 32 thinner than the thickness of the H-shaped steel webs forming the upper stud 22 and the lower stud 24, the shear yield stress can be relatively reduced.

[0037] In this way, any desired shear yield strength can be obtained by adjusting the shear yield stress of the steel material used for the panel 32 and the thickness of the panel 32. Also, any desired shear yield strength can be obtained by adjusting the width (length along the X direction) of the panel 32.

[0038] The reinforcements 34, 36 are each formed to have a smaller shear yield strength than the steel material forming the upper studs 22 and the lower studs 24, or to have a shear yield strength equivalent to that of the steel material forming the upper studs 22 and the lower studs 24. Also, the reinforcements 34, 36 are each formed to have a larger shear yield strength than the steel material forming the panel 32.

[0039] The reinforcing member 34 is formed into a plate shape with both ends welded to the two central ribs 46. The reinforcing member 34 is provided along the X direction in the center of the panel 32 in the Z direction, and is disposed in contact with one surface of the panel 32.

[0040] The upper and lower ends of the reinforcing member 36 are welded to the base plate 22C (see FIG. 1) and the top plate 24C, respectively, and are formed into a plate shape. The reinforcing member 36 is provided along the Z direction in the center of the panel 32 in the X direction, and is disposed in contact with the other surface of the panel 32 (the surface opposite to the surface in contact with the reinforcing member 34). The reinforcing members 34 and 36 may each be welded or bonded to the panel 32.

[0041] <How to install vibration-damping studs> The studs 20 are formed by assembling the parts assembled in a factory to the column-beam frame on-site. Specifically, the unit U1 formed of the main body 22B of the upper stud 22, the base plate 22C, the main body 24B of the lower stud 24, the top plate 24C, the axial force transmission rib 40, and the shear yielding portion 30 is assembled in the factory and then transported to the building construction site.

[0042] At a building construction site, after a slab (not shown) is laid across the upper beam 10A and the lower beam 10B, a unit U1 is placed between the upper end 22A of the upper stud 22 and the lower end 24A of the lower stud 24, and this unit U1 is joined to the upper end 22A and the lower end 24A.

[0043] The unit U1 may be placed between the upper end 22A and the lower end 24A before the slab is laid. In this case, the unit U1 is temporarily fixed to the upper beam 10A and the lower beam 10B, and is permanently fixed (the bolts that fix the splice plate (see FIG. 1) are permanently tightened) after the slab is formed.

[0044] <Action and Effects> 1, in the stud 20 according to the embodiment of the present invention, a shear yielding portion 30 is disposed between the upper stud 22 joined to the upper beam 10A and the lower stud 24 joined to the lower beam 10B. Therefore, when the upper stud 22 and the lower stud 24 are relatively displaced in the lateral direction (X direction) during an earthquake, a shear force acts on the shear yielding portion 30.

[0045] The panel 32 (see FIG. 2) that forms the shear yield portion 30 has a smaller shear yield strength than the steel material that constitutes the upper stud 22 and the lower stud 24. Therefore, the panel 32 undergoes shear deformation before the upper stud 22 and the lower stud 24, and is able to absorb earthquake energy.

[0046] In addition, the studs 20 are provided with axial force transmission ribs 40 that extend from the upper studs 22 to the lower studs 24. During an earthquake, vertical axial forces act on the upper studs 22 and lower studs 24 due to vertical and horizontal shaking, but the axial force is transmitted between the upper studs 22 and lower studs 24 via the axial force transmission ribs 40. This prevents axial force from being input to the panels 32.

[0047] Therefore, the panel 32 is unlikely to buckle due to axial force, and as a result, the panel 32 can undergo sufficient shear deformation, making it easy to absorb earthquake energy.

[0048] Here, when upper beam 10A and lower beam 10B are displaced relative to each other during an earthquake, a bending moment acts on stud 20. Upper stud 22 is rigidly connected to upper beam 10A, and lower stud 24 is rigidly connected to lower beam 10B. For this reason, the bending moment acting on stud 20 is smallest in the middle part between upper beam 10A and lower beam 10B (near center line CL).

[0049] In the stud 20, the shear yielding portion 30 is disposed at the position where the bending moment is smallest (the position straddling the center line CL). Therefore, bending moment is unlikely to act on the shear yielding portion 30. This allows the panel 32 to undergo sufficient shear deformation, making it easier to absorb earthquake energy.

[0050] Furthermore, in the case of the studs 20, the panels 32 will shear yield if an external force greater than the building's primary design seismic force is applied. In other words, the panels 32 will not shear yield if an external force equal to or less than the building's primary design seismic force is applied. In other words, when the studs 20 experience internal stress equal to or less than the stress calculated by the building's allowable stress calculation, the panels 32 will not shear yield and will maintain their elasticity. This allows the studs 20 to function as earthquake-resistant members in small- to medium-sized earthquakes, and as vibration-damping members in large-scale earthquakes.

[0051] Additionally, the studs 20 are provided with reinforcing members 34, 36 in contact with the panels 32. This prevents the panels 32 from buckling in the out-of-plane direction (Y direction). Therefore, the panels 32 can undergo sufficient shear deformation, making it easier to absorb earthquake energy.

[0052] In this way, the provision of shear yielding sections 30 in the studs 20 allows them to absorb earthquake energy, thereby suppressing damage to the column-beam structure of the building. Also, compared to using vibration control devices such as dampers, the vibration control performance of the building can be improved at low cost.

[0053] <Other embodiments> In the above-described embodiment, the upper stud 22 is formed by the upper end portion 22A, the main body portion 22B, and the base plate 22C, and the lower stud 24 is formed by the lower end portion 24A, the main body portion 24B, and the top plate 24C, but the embodiments of the present invention are not limited to this.

[0054] 4A, instead of the upper end portion 22A and the main body portion 22B, a main body portion 22D which is an integral part of the upper end portion 22A and the main body portion 22B may be provided. Also, instead of the lower end portion 24A and the main body portion 24B, a main body portion 24D which is an integral part of the lower end portion 24A and the main body portion 24B may be provided.

[0055] In this case, a unit U2 formed by the base plate 22C of the upper stud 22, the top plate 24C of the lower stud 24, the central rib 46 of the axial force transmission rib 40, and the shear yielding portion 30 is assembled in a factory and then transported to the construction site of the building. The unit U2 is welded to the main body portion 22D, the main body portion 24D, the upper rib 42, and the lower rib 44.

[0056] 4(B), joining plates 22E and 24E may be provided at the lower end of the main body 22D and the upper end of the main body 24D, respectively. In this case, by bolting the joining plate 22E to the base plate 22C and bolting the joining plate 24E to the top plate 24C, the amount of welding work at the site can be reduced.

[0057] In the above-described embodiment, as shown in FIG. 1, the upper rib 42, the lower rib 44 and the two central ribs 46 (two when the column-beam frame is viewed from the front) are provided, but the embodiment of the present invention is not limited to this.

[0058] 5, a configuration may be adopted in which only one upper rib 42 and one lower rib 44 are provided. In this case, one of the central ribs 46 (central rib 46A) is disposed on the extension line of the flanges of the upper stud 22 and the lower stud 24. This allows the flanges of the upper stud 22 and the lower stud 24 to be used as axial force transmission ribs.

[0059] In addition, in the embodiment described above, the upper stud 22 is rigidly joined to the upper beam 10A, and the lower stud 24 is rigidly joined to the lower beam 10B, but the embodiment of the present invention is not limited to this. For example, the joining method and joining force of the upper stud 22 and the lower stud 24 to the upper beam 10A and the lower beam 10B are arbitrary, and the joining method and joining force may be different from each other.

[0060] In this case, the height position at which the bending moment is minimum changes in the stud 20. Specifically, the height position at which the bending moment is minimum approaches the portion where the joining strength is small. In this case, it is preferable to also move the shear yielding portion 30 appropriately.

[0061] In the above embodiment, the panel 32 is assumed to yield in shear when an external force larger than the primary design seismic force of the building occurs, but the embodiment of the present invention is not limited to this. That is, the shear strength of the panel 32 can be set to any value.

[0062] For example, the shear strength of the panel 32 may be a strength at which the panel 32 shear yields when an external force equal to or less than the allowable design stress acts on the building. This allows the shear yielding portion 30 to exhibit vibration control performance even in small to medium-sized earthquakes. [Explanation of symbols]

[0063] 10A Upper beam (upper beam) 10B Lower beam (lower beam) 20 Vibration-damping studs 22 Upper Stud 24 Lower Stud 30 Shear yield section 40 Axial force transmission rib

Claims

1. a steel upper stud connected to the upper beam and having a base plate at its lower end; a lower stud made of steel, which is joined to a lower beam below the upper stud and spaced apart from the upper stud, and which has a top plate at an upper end thereof; a shear yield portion that is joined to a lower end surface of the upper stud and an upper end surface of the lower stud and has a shear yield strength smaller than that of the steel material constituting the upper stud and the lower stud; an axial force transmission rib, which is provided from above the base plate to below the top plate in parallel with the flanges of the upper stud and the lower stud, and which transmits the axial force acting on the upper stud to the lower stud, the lower end of which is welded to the upper end surface of the base plate, the upper end of which is welded to the lower end surface of the top plate, the upper end of which is welded to the lower end surface of the base plate, and the lower end of which is welded to the upper end surface of the top plate, having The upper portion of the base plate is welded to the web of the upper stud along the vertical direction; The lower portion of the top plate is welded to the web of the lower stud along the vertical direction. Vibration-damping studs.

2. The axial force transmission rib is As a portion disposed above the base plate, two upper ribs; As a portion disposed below the top plate, two lower ribs; As a portion disposed between the base plate and the top plate, two central ribs are welded to a lower end surface of the upper stud and an upper end surface of the lower stud; Equipped with The shear yield portion is Located between the two central ribs, 2. The vibration-damping stud of claim 1.

3. The shear yield portion is A plate-shaped panel along an in-plane direction of a column-beam frame including the beam; a first laterally extending stiffener disposed adjacent one face of the panel; A second reinforcing member arranged in contact with the other surface of the panel along the vertical direction; Equipped with 2. The vibration-damping stud of claim 1.

4. the upper stud is rigidly connected to the upper beam; The lower stud is rigidly connected to the lower beam; The shear yield portion is provided at a position including an intermediate height between the upper beam and the lower beam.

2. The vibration-damping stud of claim 1.

5. 3. The vibration-damping stud according to claim 1, wherein the shear yielding portion undergoes shear yielding when an external force larger than a primary design seismic force of the building occurs.

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