Damper unit

Abstract

The present invention provides a damper unit that prevents buckling of the frame structure of a crank damper in the out-of-plane direction, and that can effectively absorb the energy generated in a building structure during an earthquake. [Solution] The damper unit 35 is used in a frame structure 10 consisting of columns 20 installed at predetermined intervals and at least one beam 30 connecting the columns 20, and comprises a crank damper 40 composed of a first steel member 50 and a second steel member 60 extending from diagonally opposite ends of the frame structure 10 at one end, and a third steel member 70 connecting the other ends of the first steel member 50 and the second steel member 60, and a regulating mechanism 100 extending from the beam 30 and sliding in contact with the crank damper 40 in a direction perpendicular to the frame structure 10, thereby preventing the crank damper 40 from buckling outwards from the frame structure 10.

Description

[Technical Field]

[0001] This invention relates to a damper unit used in building structures. [Background technology]

[0002] A conventional brace unit is described in Patent Document 1. According to this, the brace comprises a frame structure consisting of columns installed at predetermined intervals and beams installed between the upper ends of each column, and a brace in which multiple high-yield-point steel members and low-yield-point steel members positioned between the high-yield-point steel members and functioning as eccentric members are welded together and integrated, and the brace is attached within the frame structure plane, extending from the base of the column to the joint at the upper end of the column. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2005-155262 [Overview of the Initiative] [Problems that the invention aims to solve]

[0004] Patent Document 1 describes how out-of-plane buckling of the frame structure can be prevented during compression, but since it does not provide detailed information, the applicants decided to attempt to verify the facts.

[0005] The following outlines the experimental setup and loading method for a crank-shaped steel hysteresis damper (hereinafter referred to as the crank damper) that mimics the brace of the brace unit described above. Next, the hysteresis curves of test specimens X and Y are presented as examples, and their characteristics are described.

[0006] [Experiment Overview] In buildings with a steel frame rigid structure that incorporates braces, the braces generally bear a large horizontal force because their horizontal stiffness is higher than that of the rigid structure. If the braces possess sufficient strength to match their horizontal stiffness, it becomes easier to keep the stress on the braces below the allowable stress in the primary design (allowable stress design). However, since braces generally have low strength relative to their horizontal stiffness, the stress may exceed the allowable stress, leading to structural design difficulties.

[0007] A crank damper, in which diagonally oriented members called main members (corresponding to the first and second steel members in this invention) are joined to members perpendicular to the main members, called strut members (corresponding to the third steel member in this invention), can reduce the apparent axial stiffness compared to a general straight brace due to the bending and shear deformation caused by the crank shape. It is assumed that the center of the strut member will be laterally reinforced by lateral stiffeners provided from the upper and lower floor beams.

[0008] This experiment aims to verify the basic performance of crank dampers by applying gradually increasing amplitude loads to a partial frame using crank dampers in the diagonal members, and to confirm its hysteretic behavior, plastic deformation capacity, and failure conditions.

[0009] [Experimental Method] The loading device is shown in Figure 8. Loading was performed by attaching two test specimens diagonally to a column jig, whose lower end was pin-supported to the reaction floor, and a beam jig, fixed to the reaction floor. A horizontal force P was then applied to the column jig using a push-pull hydraulic jack, thereby loading the test specimens. A bracing device was installed above the loading point of the column jig to restrain out-of-plane deformation and torsional deformation of the column jig above the loading point. Furthermore, in one test specimen (hereinafter referred to as test specimen X), a bracing device was installed on a steel plate attached to a lateral bracing jig at the center of the beam member to restrain out-of-plane deformation and torsional deformation at the center of the beam member. (The other test specimen (hereinafter referred to as test specimen Y) does not have a bracing device installed to prevent out-of-plane deformation of the crank damper.) The load was controlled by the interlayer deformation angle R, and the positive loading direction was set as the pushing direction of the hydraulic jack shown in Fig. 8. The load history was as follows: at the target interlayer deformation angles R = ±1 / 400 (2.5×10 -3 ), ±1 / 200 (5.0×10 -3 ), ±1 / 150 (6.7×10 -3 ), ±1 / 100 (10×10 -3 ), 1 / 75 (13.3×10 -3 ), ±1 / 50 (20×10 -3 ), ±1 / 33 (30×10 -3 ), ±1 / 25 (40×10 -3 ) rad, two cycles of positive and negative alternating increasing amplitude loading were performed for each, and then unidirectional loading was carried out in the positive loading direction up to +1 / 20 (50×10 -3 ) rad.

[0010] [What is the history curve] In this experiment, the history curve shows the relationship between the horizontal force P (loading value) and the interlayer deformation angle R. Generally, it is desirable to have a stable spindle-shaped history curve as shown in Fig. 9, and it is considered that the larger the illustrated history area, the higher the earthquake energy absorption capacity. Note that the interlayer deformation angle R can be expressed by Equation I.

[0011] R = δ h / H … Equation I (Example: When converting the interlayer deformation angle R = 1 / 25 rad to the horizontal displacement, if H = 2030 mm, then δ h = H / 25 = 2030 / 25 = 81.2 mm)

[0012] [History curves of Specimen X and Specimen Y and their characteristics] From Fig. 10, it can be seen that Specimen X has a stable spindle-shaped history behavior and a large history area. Also, from Fig. 11, it can be seen that there is almost no out-of-plane deformation, and the sway control device (lateral bracing fixture) is effective in preventing out-of-plane buckling.

[0013] Similarly, for Specimen Y, the history curve is shown in Fig. 12 and the out-of-plane deformation is shown in Fig. 13.

[0014] Figure 12 shows that the hysteresis pattern of test specimen Y is not a stable spindle shape, and the hysteresis area is almost nonexistent. Furthermore, Figure 13 confirms that the entire structure buckled in the direction outward of the structural plane. From the above, it can be seen that buckling can be prevented by a vibration damping device, and the crank damper exhibits stable performance (larger hysteresis area). In other words, it can be said that a configuration equivalent to a vibration damping device is necessary.

[0015] Based on the above, in the brace unit described in Patent Document 1, depending on the member configuration and eccentricity, if the crank-shaped brace is subjected to excessive compressive force due to the horizontal deformation of the frame structure during an earthquake or storm, it may buckle outward from the frame plane of the frame structure, causing a rapid loss of compressive strength and potentially leading to the collapse of the building structure.

[0016] In view of the above, the present invention provides a damper unit that prevents the crank damper from buckling outward in the structural frame direction and can effectively absorb the energy generated in a building structure during an earthquake. [Means for solving the problem]

[0017] The invention described in claim 1 is used in a frame structure consisting of columns installed at predetermined intervals and at least one beam connecting the columns, A crank damper comprising a first steel member and a second steel member, each extending from a diagonally opposite end of the structural frame of the frame structure, and a third steel member connecting the other ends of the first and second steel members, A restricting mechanism extending from the column and / or the beam, and slidingly contacting the crank damper in a direction perpendicular to the structural plane of the frame structure, thereby preventing the crank damper from buckling outward from the structural plane of the frame structure; It is equipped with.

[0018] According to this, the regulating mechanism can follow the movement of the horizontal deformation and suppress the out-of-plane deformation of the framed structure frame. Therefore, even if the crank damper receives an excessive compressive force, it will not buckle and can effectively absorb the energy generated during an earthquake in the building structure.

[0019] Further, the regulating mechanism auxiliary steel members that are extended to connect two points of the framed structure frame and are arranged in at least a pair so as to sandwich the crank damper in a direction orthogonal to the plane of the framed structure frame, and a convex member arranged on either one of the crank damper or the auxiliary steel member, and a plate member arranged on the other and capable of sliding contact with the convex member are provided.

[0020] With such a configuration, while the regulating mechanism follows the horizontal deformation, it can prevent the buckling of the crank damper in the out-of-plane direction of the framed structure frame and effectively absorb the energy generated during an earthquake in the building structure.

[0021] Further, a pair of plates are arranged on the column or / and the beam in a direction orthogonal to the plane of the framed structure frame. The crank damper is provided with an extending member extending from the crank damper. An entering member that can enter between the pair of plates is protrudingly provided on the extending member.​​​​​​​​​​​The extension member is provided with a pair of plates arranged in a direction perpendicular to the structural plane of the frame structure. The column and / or the beam is provided with an access member that can enter between the pair of plates. The plate is provided with sliding contact protrusions that can slide against the entry member.

[0024] With this configuration, the regulatory mechanism follows the horizontal deformation, preventing the crank damper's framing structure from buckling outwards, and effectively absorbing the energy generated in the building structure during an earthquake.

[0025] Furthermore, hydraulic dampers are provided to connect the other end of the first steel material to one end of the second steel material, and to connect the other end of the second steel material to one end of the second steel material.

[0026] According to this, the system is configured to absorb various vibrational energies, such as small vibrations from wind using hydraulic dampers and earthquakes using crank dampers. By combining hydraulic dampers and crank dampers, a displacement amplification effect can also be obtained, and damper efficiency can be improved. [Brief explanation of the drawing]

[0027] [Figure 1] This is a front view of the damper unit in the first embodiment of the present invention. [Figure 2] This is a view taken along line II-II of the same embodiment. [Figure 3] (a) is an exploded perspective view of the convex member, and (b) is a perspective view. [Figure 4] This is a front view of the damper unit in the second embodiment of the present invention. [Figure 5] (a) of the same embodiment is a view along the line Va-Va, (b) is an end view along the line Vb-Vb, and (c) is a view along the line Vc-Vc. [Figure 6] This is a schematic diagram illustrating the arrangement of hydraulic dampers. [Figure 7] This is a schematic diagram illustrating modified versions of the plate and entry member. [Figure 8] This is an explanatory diagram of the loading device used in the experiment. [Figure 9] This figure shows an example of a history curve. [Figure 10] This is a diagram showing the relationship between horizontal force P and inter-story drift angle R (test specimen X). [Figure 11] This figure shows the deformation of test specimen X in the direction outside the structural plane. [Figure 12] This is a diagram showing the relationship between horizontal force P and inter-story drift angle R (test specimen Y). [Figure 13] This figure shows the deformation of test specimen Y in the direction outside the structural plane. [Modes for carrying out the invention]

[0028] A first embodiment of the damper unit according to the present invention will be described with reference to the drawings. In the following description, where arrows are used in the drawings, F indicates the front, B indicates the rear, R indicates the right, L indicates the left, U indicates the top, and D indicates the bottom.

[0029] As shown in Figures 1 and 2, the damper unit 35 of the present invention is used in a frame structure 10 consisting of columns 20 installed at predetermined intervals (when distinguishing between them, the left column 20 is referred to as column 201 and the right column 20 as column 202) and beams 30 connecting the columns 20 (when distinguishing between them, the upper beam 30 is referred to as beam 301 and the lower beam 30 as beam 302).

[0030] A concrete floor 32 is installed above the beam 30 and in the area enclosed by the beam 30.

[0031] The damper unit 35 is generally composed of a crank damper 40 and a regulating mechanism 100, as shown in Figures 1 to 3.

[0032] The crank damper 40 is composed of a first steel member 50 and a second steel member 60, which extend from the frame structure 10 at one end (base end), and a third steel member 70 that connects the other ends (free ends) of the first steel member 50 and the second steel member 60.

[0033] In this embodiment, the first steel member 50, the second steel member 60, and the third steel member 70 are H-shaped steel beams. The third steel member 70 is connected to the other ends (free ends) of the first steel member 50 and the second steel member 60 at both ends in the longitudinal direction by welding or the like.

[0034] Flat mounting plates 80 (when distinguishing between them, the upper mounting plate 80 will be referred to as mounting plate 801 and the lower mounting plate 80 as mounting plate 802) are installed, with mounting plate 801 fixed to the column 202 and beam 301, and mounting plate 802 fixed to the column 201 and beam 302.

[0035] The crank damper 40 is attached to the mounting plate 801 at the right end of the second steel member 60 and to the mounting plate 802 at the left end of the first steel member 50 via a connecting plate 81, using bolts, nuts, etc. In other words, the first steel member 50 and the second steel member 60 extend from diagonally opposite parts of the structural plane (vertical plane) of the frame structure 10.

[0036] In this embodiment, the regulating mechanism 100 includes an auxiliary steel member 110, a convex member 120, and a plate member 130.

[0037] The auxiliary steel members 110 are made of steel, and H-shaped steel having a web and a flange is used, and consists of a pair of front auxiliary steel members 112 and a pair of rear auxiliary steel members 114.

[0038] The front auxiliary steel members 112 and the rear auxiliary steel members 114 are each arranged in pairs along the vertical direction.

[0039] The front auxiliary steel members 112 are arranged to span the front sides of beams 301 and 302 together, and the rear auxiliary steel members 114 are arranged to span the rear sides of beams 301 and 302 together, via mounting plates 115 attached to beams 301 and 302, respectively. A total of four mounting plates 115 are provided.

[0040] The front auxiliary steel member 112 and the rear auxiliary steel member 114 are connected by connecting plates 116. There are a total of four connecting plates 116.

[0041] In this embodiment, the convex member 120 is disposed on the auxiliary steel member 110 side. The convex member 120 is a grab screw in which a low-friction material such as synthetic resin is attached to one end of a fully threaded rod with a male thread, and a nut is screwed onto it.

[0042] The protruding member 120 is fixed by inserting the threaded portion through a hole formed in the flange on the crank damper 40 side of the front auxiliary steel member 112 and the rear auxiliary steel member 114, and welding it with the nut portion.

[0043] The plate member 130 is made of steel and is positioned at the bent portion of the crank damper 40. In this embodiment, the plate member 130 is fixed to the first steel member 50 and the third steel member 70, and to the second steel member 60 and the third steel member 70.

[0044] The convex member 120 and the plate member 130 are designed to be able to slide against each other.

[0045] Based on the above, the damper unit 35 extends to connect two points of the frame structure 10, and in a direction perpendicular to the structural plane of the frame structure 10, two pairs of auxiliary steel members 110 are arranged to sandwich the crank damper 40. It can be said that the device comprises a convex member 120 arranged on the auxiliary steel member 110 and a plate member 130 arranged on the crank damper 40 that is in sliding contact with the convex member 120.

[0046] Based on the above, the regulating mechanism 100 extends from the beam 30 and slides against the crank damper 40 in a direction perpendicular to the structural plane of the frame structure 10, thereby preventing the crank damper 40 from buckling outwards from the structural plane of the frame structure 10.

[0047] The damper unit 35 with the above configuration is used in a frame structure 10 consisting of columns 20 installed at predetermined intervals and at least one beam 30 connecting the columns 20. A crank damper 40 is composed of a first steel member 50 and a second steel member 60, which extend from diagonally opposite parts of the structural plane of the frame 10 at one end, and a third steel member 70 that connects the other ends of the first steel member 50 and the second steel member 60. A restricting mechanism 100 extends from the beam 30 and slides against the crank damper 40 in a direction perpendicular to the structural plane of the frame structure 10, thereby preventing the crank damper 40 from buckling outwards from the structural plane of the frame structure 10. It is equipped with.

[0048] According to this, the regulatory mechanism 100 can follow the horizontal deformation movement and suppress the deformation of the frame structure 10 in the direction outward of the frame plane, so that the crank damper 40 will not buckle even if subjected to excessive compressive force, and the energy generated in the building structure during an earthquake can be effectively absorbed.

[0049] Furthermore, regulatory body 100, An auxiliary steel member 110 is provided, extending to connect two points of the structural frame 10 and positioned in a direction perpendicular to the structural plane of the structural frame 10, with at least one pair of auxiliary steel members 110 flanking the crank damper 40. A protruding member 120 is arranged on the auxiliary steel member 110, and a plate member 130 is arranged on the crank damper 40 and is capable of sliding contact with the protruding member 120. It is equipped with.

[0050] With this configuration, the regulatory mechanism 100 follows the horizontal deformation, preventing the crank damper 40 from buckling outwards from the structural frame 10, and effectively absorbing the energy generated in the building structure during an earthquake.

[0051] A second embodiment of the damper unit according to the present invention will be described with reference to the drawings. In the following description, components corresponding to those in the first embodiment will be denoted by the same reference numerals, and their descriptions will be omitted in whole or in part.

[0052] In this embodiment, the regulating mechanism 100A of the damper unit 35A is provided with a pair of plates 140 on beams 301 and 302, respectively, in the front-rear direction (in a direction perpendicular to the structural plane of the framed structure 10), as shown in Figures 4 and 5.

[0053] An extension member 160 extends from the crank damper 40. (When distinguishing between them, the upper extension member 160 is designated as extension member 1601, and the lower extension member 160 as extension member 1602).

[0054] The extension member 160 is made of steel H-shaped steel and is fixed to the crank damper 40 at the center of the extension member 160 in the longitudinal direction and at the end on the side away from the beam 30.

[0055] In this embodiment, the extension member 1601 is fixed at the other end of the first steel member 50 at its longitudinal center and at the other end of the second steel member 60 at its lower end. The extension member 1602 is fixed at the other end of the first steel member 50 at its upper end and at the other end of the second steel member 60 at its longitudinal center. As shown in Figure 5(c), the extension member 160 and the first steel member 50 and second steel member 60 are connected using multiple plates, bolts, nuts, etc.

[0056] An entry member 170 is provided protruding from the end of the extension member 160 that faces the beams 301 and 302, allowing it to enter between the pair of plates 140. The entry member 170 is made of metal and is formed in the shape of a rectangular flat plate.

[0057] The plate 140 is provided with a sliding contact projection 180 that can slide against the entry member 170. The sliding contact projection 180 has the same configuration as the projection member 120 and is fixed to the plate at the nut portion.

[0058] With this configuration, the regulatory mechanism 100 follows the horizontal deformation, preventing the crank damper 40 from buckling outwards from the structural frame 10, and effectively absorbing the energy generated in the building structure during an earthquake.

[0059] The damper unit of the present invention is not limited to the above configuration. That is, various design modifications are possible as long as they do not depart from the spirit of the present invention.

[0060] For example, as shown in Figure 6, a hydraulic damper 190 can be installed to connect the other end of the first steel member 50 to one end of the second steel member 60, and to connect the other end of the second steel member 60 to one end of the first steel member 50. Note that in Figure 6, components other than the crank damper 40, hydraulic damper 190, and mounting plate 80 are omitted.

[0061] With this configuration, the hydraulic damper 190 absorbs small vibrations such as wind, and the crank damper 40 absorbs earthquakes, thus absorbing various vibrational energies. By combining the hydraulic damper 190 and the crank damper 40, a displacement amplification effect is also obtained, and the damper efficiency is improved.

[0062] Furthermore, as shown in the modified example in Figure 7, a pair of plates 140 are arranged on the extension member 160 in a direction perpendicular to the structural plane of the framed structure 10, an entry member 170 is provided on the column 20 and / or beam 30 that can enter between the pair of plates 140, and a sliding contact projection 180 is provided on the plate 140 that can slide against the entry member 170.

[0063] Even with this configuration, the regulatory mechanism 100 follows the horizontal deformation, preventing the crank damper 40 from buckling outwards from the structural frame 10, and effectively absorbing the energy generated in the building structure during an earthquake.

[0064] Furthermore, the structural frame 10 only requires at least one beam 30 connecting the columns 20.

[0065] Furthermore, the mounting plate 80 can be appropriately modified and installed on the column 20 and / or beam 30 depending on the intended use, and the first steel member 50 and the second steel member 60 can be attached to it.

[0066] Furthermore, the pair of plates 140 can be appropriately modified and arranged on the columns 20 and / or beams 30 depending on the intended use, and the first steel members 50 and the second steel members 60 can be attached to them.

[0067] Furthermore, the protruding member 120 can be installed on either the crank damper 40 or the auxiliary steel member 110, depending on the intended use. Corresponding to the protruding member 120, the plate member 130 can also be installed on the other of either the crank damper 40 or the auxiliary steel member 110.

[0068] Furthermore, in addition to H-shaped steel, square steel pipes can be used for the first steel material 50, the second steel material 60, and the third steel material 70.

[0069] In addition, the auxiliary steel material 110 can be made of materials other than H-shaped steel, such as square steel pipes or channel steel.

[0070] Furthermore, the number of connecting plates 116 can be changed as appropriate depending on the intended use.

[0071] Furthermore, while the convex member 120 had a low-friction material such as synthetic resin attached to one end of the fully threaded member with a male thread, it is conceivable to attach or coat a material with low frictional resistance to the plate member 130. In this case, the convex member 120 would not have a material with low frictional resistance (low-friction material) attached to it.

[0072] Furthermore, the extension member 160 can be made of materials other than H-shaped steel, such as square steel pipes or channel steel.

[0073] Furthermore, the floor is not limited to concrete floors; it can also be used on dry roofs (floors) with horizontal bracing. [Explanation of Symbols]

[0074] 10 Frame structure 20 pillars 30 Beam 35 Damper Unit 40 Crank Damper 50 Daiichi Steel 60 Second steel material 70 Third steel material 100 Regulatory Organizations 110 Auxiliary steel materials 120 Convex member 130 Plate members 35A Damper Unit 100A Regulatory Organization 140 Plate 160 Extension member 170 Entry member 180 Sliding contact protrusion 190 Hydraulic Damper

Claims

1. It is used in a frame structure consisting of columns installed at predetermined intervals and at least one beam connecting the columns. A crank damper comprising a first steel member and a second steel member, each extending from a diagonally opposite end of the structural frame of the frame structure, and a third steel member connecting the other ends of the first and second steel members, A restricting mechanism extending from the column and / or the beam, and slidingly contacting the crank damper in a direction perpendicular to the structural plane of the frame structure, thereby preventing the crank damper from buckling outward from the structural plane of the frame structure; A damper unit characterized by having the following features.

2. The aforementioned iPhone mechanism, An auxiliary steel member is provided that extends to connect two points of the aforementioned structural frame and is positioned in a direction perpendicular to the structural plane of the structural frame, with at least one pair of auxiliary steel members positioned so as to sandwich the crank damper, A convex member disposed on either the crank damper or the auxiliary steel member, and a plate member disposed on the other and capable of sliding contact with the convex member, The damper unit according to claim 1, characterized by comprising:

3. A pair of plates are provided on the column and / or beam in a direction perpendicular to the structural plane of the frame structure. The crank damper includes an extended member extending from the crank damper, The extension member is provided with an entry member that can enter between the pair of plates, The damper unit according to claim 1, characterized in that the plate is provided with a sliding contact projection that can slide in contact with the entry member.

4. The crank damper includes an extended member extending from the crank damper, The extension member is provided with a pair of plates arranged in a direction perpendicular to the structural plane of the frame structure. The column and / or the beam is provided with an access member that can enter between the pair of plates. The damper unit according to claim 1, characterized in that the plate is provided with a sliding contact projection that can slide in contact with the entry member.

5. The damper unit according to claim 1, characterized in that a hydraulic damper is provided to connect the other end of the first steel material to one end of the second steel material, and to connect the other end of the second steel material to one end of the second steel material.

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