A pure bending multi-stage energy dissipation damper

Abstract

The present invention discloses a pure bending multi-stage energy dissipation damper, comprising: a square steel frame, a bending energy dissipation steel plate, and a pure bending displacement limiting device; the upper and lower ends of the bending energy dissipation steel plate are both provided with semi-cylindrical connecting shafts, and the inner end surfaces of the upper and lower end plates of the square steel frame are both provided with semi-cylindrical rotating grooves corresponding to the connecting shafts, and both ends of the rotating grooves are closed. The bending energy dissipation steel plate is rotationally connected to the rotating grooves on the inner walls of the upper and lower end plates of the square steel frame; the pure bending displacement limiting device is composed of a plurality of circular arc displacement limiting steel plates and front and rear cover plates, and the plurality of circular arc displacement limiting steel plates are welded on the front cover plate and the rear cover plate, and the pure bending displacement limiting device is placed inside the square steel frame; the bending energy dissipation steel plates are placed at intervals of the circular arc displacement limiting steel plates, and the minimum distance between the circular arc displacement limiting steel plates is consistent with the thickness of the bending energy dissipation steel plates; multi-stage yield energy dissipation is achieved by different thicknesses of the bending energy dissipation steel plates and different curvatures of the circular arc displacement limiting steel plates.

Description

Technical Field

[0001] The invention belongs to the field of energy dissipation and shock absorption of building structures, and more specifically relates to a pure bending multi-stage energy dissipation damper. Background Art

[0002] Earthquake disasters have always been one of the most serious natural disasters faced by mankind. Traditional earthquake-resistant measures are mainly to enhance the strength, stiffness and ductility of the structure itself. This earthquake-resistant measure stores and consumes earthquake energy through the structure itself, which will cause irreparable damage to the building. In recent decades, by adding dampers to buildings and using damper energy-absorbing elements to dissipate earthquake energy, the destructive effects of earthquakes on building structures can be reduced or even avoided, thereby achieving the purpose of earthquake resistance. At present, there are many types of dampers, including friction dampers, viscous fluid dampers and viscoelastic dampers. Among them, metal dampers have low production costs and are easy to construct, and are widely used in engineering structure shock absorption.

[0003] Metal dampers use the plastic hysteresis deformation generated when metal materials yield to dissipate the energy input to the structure by earthquakes, which can effectively reduce the vibration response of the structure. At present, most of the existing metal dampers have not achieved full-area yield, the material utilization rate is not sufficient, and the fullness of the hysteresis curve shape needs to be further improved; at the same time, most dampers either yield and dissipate energy during moderate earthquakes or yield and dissipate energy during large earthquakes, lacking the ability to dissipate energy in stages.

[0004] Therefore, how to improve material utilization and how to grade yield energy dissipation at different earthquake magnitudes are issues that need to be urgently addressed in the research field of metal dampers. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a pure bending multi-stage energy dissipation damper, which utilizes the contact deformation of the energy dissipation steel plate under the constraint of the displacement limit device to gradually realize plastic pure bending, achieve full-area yield, and dissipate energy in graded yield at different earthquake magnitudes.

[0006] The technical solution adopted by the present invention to solve the technical problem is a pure bending multi-stage energy dissipation damper device, comprising: a square steel frame, a bending energy dissipation steel plate, and a pure bending displacement limiting device.

[0007] In the above-mentioned pure bending multi-stage energy dissipation damper, the square steel frame is formed by connecting the upper and lower end plates, the left end plate and the right end plate with high-strength bolts, the left end plate is provided with holes, and the right end plate is welded to the right connecting end plate.

[0008] In the above-mentioned pure bending multi-stage energy dissipation damper, the pure bending displacement limiting device is formed by welding arc displacement limiting steel plates equidistantly or unequally on the front cover plate and the rear cover plate, and a left connecting end plate is welded on the left side of the device.

[0009] In the above-mentioned pure bending multi-stage energy dissipation damper, the pure bending displacement limiting device is placed inside the square steel frame, with certain gaps left on the left and right, and the pure bending displacement limiting device can slide back and forth slightly inside the square steel frame.

[0010] In the above-mentioned pure bending multi-stage energy dissipation damper, the left connecting end plate of the pure bending displacement limiting device passes through the hole of the left end plate of the square steel frame, and the size of the hole is slightly larger than the cross-sectional size of the left connecting end plate.

[0011] In the above-mentioned pure bending multi-stage energy dissipation damper, there are multiple bending energy dissipation steel plates, and the arc-shaped displacement limiting steel plates are arranged side by side inside the square steel frame. The thickness of the bending energy dissipation steel plates is the same as the minimum distance between two adjacent arc-shaped displacement limiting steel plates.

[0012] In the above-mentioned pure bending multi-stage energy dissipation damper, the upper and lower ends of the bending energy dissipation steel plate are rotatably connected to the inner end surfaces of the upper and lower end plates of the corresponding square steel frame respectively.

[0013] The above-mentioned pure bending multi-stage energy-absorbing damper, the upper and lower sides of the bending energy-absorbing steel plate are provided with connecting shafts rotatably connected to the upper and lower end plates, the inner end surfaces of the upper and lower end plates of the square steel frame are provided with rotating grooves rotatably connected to the corresponding connecting shafts, the rotating grooves are semi-cylindrical and both ends of the rotating grooves are closed.

[0014] The technical principle of the present invention is that the pure bending limit displacement device can slide back and forth in a small range inside the square steel frame, driving the bending energy-absorbing steel plate to bend and deform around the long axis of the cross section. As the sliding displacement increases, the contact portion between the bending energy-absorbing steel plate and the arc limit displacement steel plate bends into an arc curve, and the contact surface gradually expands to both ends. The bending energy-absorbing steel plate realizes full plastic pure bending energy consumption in the contact portion. For different earthquake magnitudes, the pure bending limit displacement device has different reciprocating sliding amplitudes inside the square steel frame, and the energy consumption of the steel plate is automatically adjusted with the size of the contact area, thereby achieving the purpose of graded energy consumption.

[0015] Under the action of static load, the deformation of the bending energy dissipation steel plate is within the linear elastic range, and the structure meets the static bearing requirements.

[0016] According to the above design, the bending energy dissipation steel plate can gradually achieve pure bending under the constraint of the arc displacement limit steel plate to achieve full-area yield energy dissipation. Assuming that the cross section is a rectangular cross section, its thickness should satisfy t≥10ρσ s / E.

[0017] Where: the cross-sectional thickness of the bending energy dissipation steel plate is t,

[0018] The yield limit of the bending energy dissipation steel plate is σ s ,

[0019] The elastic modulus of the bending energy dissipation steel plate is E,

[0020] The curvature radius of the arc displacement limiting steel plate is ρ.

[0021] The curvature radius of the arc displacement limiting steel plate satisfies: ρ≤0.1Et / σ s , and it is also possible to achieve multi-level energy dissipation by setting arc displacement limiting steel plates with different curvatures.

[0022] The thickness of the bending energy dissipation steel plate should meet the following requirements: t≥10ρσ s / E, it is also possible to achieve multi-level energy dissipation by setting curved energy-absorbing steel plates of different thicknesses.

[0023] When installing the pure bending multi-stage energy-absorbing damper, the left connecting end plate and the right connecting end plate at both ends can be connected to the two diagonals of the frame structure through hinged supports; or when installing the pure bending multi-stage energy-absorbing damper, the left connecting end plate and the right connecting end plate at both ends can be connected to the rigid support through flanges respectively, and the rigid support is connected to the two diagonals of the frame structure.

[0024] The advantages of the present invention are:

[0025] 1. The advantage of the present invention is that the bending energy dissipation steel plate can gradually achieve pure plastic bending and achieve full-area yield under the constraint of the pure bending displacement limiting device;

[0026] 2. The advantage of the present invention is that it can dissipate energy by yielding in different levels of earthquake;

[0027] 3. The earthquake-resistant mechanism of the present invention is clear, which is to make full use of materials, have low cost, be easy to process, be convenient to construct, have significant energy consumption effect, and be easy to disassemble and replace after an earthquake. The pure bending displacement limiting device can be used multiple times, saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0029] Figure 1 It is a stereoscopic diagram of a pure bending multi-stage energy dissipation damper of the present invention.

[0030] Figure 2 This is a front view of a square steel frame.

[0031] Figure 3 Schematic diagram of the left end plate.

[0032] Figure 4 This is the front view of the bent energy-absorbing steel plate.

[0033] Figure 5 Schematic diagram of the rotational connection between the upper and lower end plates and the bending energy-absorbing steel plate.

[0034] Figure 6 It is a three-dimensional diagram of the pure bending limited displacement device.

[0035] Figure 7 The present invention is a structural diagram of a pure bending multi-stage energy dissipation damper with the front cover plate and the rear cover plate removed.

[0036] In the figure: 2. bending energy dissipation steel plate, 3. pure bending limit displacement device, 11. upper and lower end plates, 12. left end plate, 13. right end plate, 101. rotating groove, 102. hole, 103. right connecting end plate, 201. connecting shaft, 31. arc limit displacement steel plate, 32. front cover plate, 33. rear cover plate, 301. left connecting end plate. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0038] Example:

[0039] Figure 1 As shown, the embodiment of the present invention discloses a pure bending multi-stage energy dissipation damper, comprising: a square steel frame, a bending energy dissipation steel plate 2, and a pure bending displacement limiting device 3;

[0040] Figure 2 and Figure 3 As shown, the square steel frame is formed by upper and lower end plates 11 , a left end plate 12 , and a right end plate 13 connected by high-strength bolts. The left end plate 12 is provided with a hole 102 , and the right end plate 13 is connected to a right connecting end plate 103 .

[0041] Figure 4 As shown, semi-cylindrical connecting shafts 201 are provided on both the upper and lower sides of the bending energy dissipation steel plate 2 .

[0042] Figure 5 As shown, the inner end surfaces of the upper and lower end plates 11 of the square steel frame are both provided with rotation grooves 101 rotatably connected to the connecting shaft 201 , and the rotation groove 101 is a semi-cylindrical groove with both ends closed.

[0043] Figure 6 As shown, the pure bending displacement limiting device 3 is formed by welding the arc displacement limiting steel plate 31 on the front cover plate 32 and the rear cover plate 33 at equal or unequal intervals, and the left side of the device is connected with the left connecting end plate 301. The pure bending displacement limiting device 3 can slide back and forth slightly inside the square steel frame, and the bending energy absorbing steel plate 2 can bend and deform around the long axis direction of the cross section under the constraint of the arc displacement limiting steel plate 31, and gradually realize plastic pure bending.

[0044] Figure 7 As shown, the bending energy dissipation steel plates 2 are arranged with arc displacement limiting steel plates 31 at intervals.

[0045] The pure bending displacement limiting device 3 is placed inside the square steel frame, and can slide back and forth slightly inside the square steel frame; the left connecting end plate 301 of the pure bending displacement limiting device passes through the hole 102 of the left end plate 12 of the square steel frame, and the size of the hole 102 is slightly larger than the cross-sectional size of the left connecting end plate 301.

[0046] The cross section of the bending energy dissipation steel plate 2 is rectangular, and multiple arc displacement limiting steel plates 31 are arranged side by side inside the square steel frame. The thickness of the bending energy dissipation steel plate 2 is equal to the minimum distance between two adjacent arc displacement limiting steel plates.

[0047] The technical principle of the present invention is that the pure bending limit displacement device 3 can slide back and forth slightly inside the square steel frame, driving the bending energy-absorbing steel plate 2 to bend and deform around the long axis of the cross section. As the sliding displacement increases, the contact portion of the bending energy-absorbing steel plate 2 and the arc limit displacement steel plate 31 bends into an arc curve, and the contact surface gradually expands to both ends. The bending energy-absorbing steel plate 2 realizes full plastic pure bending energy consumption of the contact portion. For different earthquake magnitudes, the pure bending limit displacement device 3 can slide with different amplitudes inside the square steel frame, and the energy consumption of the steel plate is automatically adjusted with the size of the contact area, thereby achieving the purpose of graded energy consumption. Under the action of static load, the deformation of the bending energy-absorbing steel plate 2 is within the linear elastic range, and the structure meets the static load-bearing requirements.

[0048] In order to further optimize the above technical solution, the bending energy dissipation steel plate 2 is made of low yield point steel, and the square steel frame and pure bending displacement limiting device 3 are made of steel with a yield strength greater than 235MPa;

[0049] Assuming that the cross section is a rectangular cross section, the relationship between the radius of curvature of the arc displacement limiting steel plate 31 and the thickness of the bending energy dissipation steel plate 2 is derived as follows:

[0050] In order to further optimize the design of the bending energy dissipation steel plate 2 and realize pure plastic bending, the bending moment in the bending energy dissipation steel plate 2 is equal to the plastic limit bending moment, that is: M = M s

[0051] Theoretically, the plastic limit bending moment is 1.5 times the elastic limit bending moment, that is: M s =1.5M e .

[0052] In the elastic-plastic stage, the bending curvature and bending moment satisfy:

[0053] Take M s =1.48M e , then: ρ=0.2ρ e

[0054] According to the pure bending curvature formula: 1 / ρe =M e / EI z , elastic limit bending moment: M e =σ s W z , substituting into the above formula, we get:

[0055] ρ=0.1Et / σ s

[0056] Take σ s =235MPa, E=206GPa, then: ρ=0.1Et / σ s =87.66t

[0057] That is, the curvature radius of the designed arc-shaped displacement limiting steel plate is ρ≤87.66t.

[0058] Wherein: the cross-sectional thickness of the bending energy dissipation steel plate 2 is t,

[0059] The cross-sectional width b of the bending energy dissipation steel plate 2 is

[0060] The curvature radius of the arc displacement limiting steel plate 31 is ρ.

[0061] That is, in order to achieve pure bending and full-range yielding of the bending energy dissipation steel plate 2, the thickness of the bending energy dissipation steel plate 2 and the curvature radius of the arc displacement limiting steel plate 31 should satisfy the above formula.

[0062] In order to achieve multi-level energy dissipation, a bending energy dissipation steel plate 2 of different thicknesses may be provided, and the thickness of the bending energy dissipation steel plate 2 should satisfy t≥ρ / 87.66;

[0063] In order to achieve multi-level energy dissipation, the curvature of the limit arc displacement limiting steel plate 31 can be different, and the curvature radius of the limit arc displacement limiting steel plate 31 satisfies ρ≤87.66t;

[0064] The left connecting end plate and the right connecting end plate at both ends of the pure bending multi-stage energy dissipation damper are respectively connected to two diagonal positions of the frame structure through hinged supports.

[0065] If the diagonal distance is too large, the left connecting end plate 301 of the pure bending displacement limiting device 3 can be connected to a rigid support, and the right connecting end plate 103 of the right end plate 13 of the square steel frame is connected to the rigid support.

[0066] Other technical solutions in this embodiment and the principle of graded yield energy dissipation are as follows: after optimized design, the bending energy dissipation steel plate of the present invention gradually realizes plastic pure bending and full-area yielding, and stepped energy dissipation is achieved by setting the thickness of the bending energy dissipation steel plate and the curvature of the arc limited displacement steel plate.

Claims

1. A pure bending multi-stage energy dissipation damper, comprising a square steel frame, a bending energy dissipation steel plate (2), and a pure bending displacement limiting device (3); characterized in that: The square steel frame is formed by connecting the upper and lower end plates (11), the left end plate (12), and the right end plate (13) by high-strength bolts; the left end plate (12) is provided with a hole (102), and the right end plate (13) is connected to the right connecting end plate (103); The pure bending displacement limiting device (3) is composed of arc displacement limiting steel plates (31) welded to the front cover plate (32) and the rear cover plate (33) at equal or unequal distances, and the left side is connected to the left connecting end plate (301); The pure bending displacement limiting device (3) is placed inside the square steel frame, leaving a certain distance on the left and right sides, and the pure bending displacement limiting device (3) can slide back and forth slightly inside the square steel frame; The left connecting end plate (301) of the pure bending displacement limiting device passes through the hole (102) of the left end plate (12) of the square steel frame, and the size of the hole (102) is slightly larger than the cross-sectional size of the left connecting end plate (301); The bending energy dissipation steel plates (2) are provided with a plurality of arc displacement limiting steel plates (31) arranged side by side inside the square steel frame, and both ends of the bending energy dissipation steel plates (2) are rotatably connected to the inner end surfaces of the upper and lower end plates (11); The bending energy absorbing steel plate (2) can bend and deform around the long axis direction of its cross section under the constraint of the circular arc displacement limiting steel plate (31); in the above-mentioned pure bending multi-stage energy absorbing damper, the upper and lower sides of the bending energy absorbing steel plate are provided with connecting shafts rotatably connected to the upper and lower end plates, and the inner end surfaces of the upper and lower end plates of the square steel frame are provided with rotating grooves rotatably connected to the corresponding connecting shafts, and the rotating grooves are semi-cylindrical and both ends of the rotating grooves are closed.

2. A pure bending multi-stage energy dissipation damper according to claim 1, characterized in that: The thickness of each bending energy dissipation steel plate (2) is equal to the minimum distance between two adjacent circular arc displacement limiting steel plates (31).

3. A pure bending multi-stage energy dissipation damper according to claim 1, characterized in that: The bending energy dissipation steel plates (2) are of the same thickness or different thicknesses. The cross section of each bending energy dissipation steel plate (2) is a rectangular cross section, and its thickness should satisfy t≥10ρσ s / E Wherein: the cross-sectional thickness of the bending energy dissipation steel plate (2) is t, The yield limit of the bending energy dissipation steel plate (2) is σ s , The elastic modulus of the bending energy dissipation steel plate (2) is E, The curvature radius of the circular arc displacement limiting steel plate (31) is ρ.

4. A pure bending multi-stage energy dissipation damper according to claim 3, characterized in that: The arc displacement limiting steel plate (31) has the same curvature or different curvatures, and the curvature radius satisfies ρ≤0.1Et / σ s .

5. A pure bending multi-stage energy dissipation damper according to any one of claims 1 to 4, characterized in that: The bending energy dissipation steel plate (2) is made of low yield point steel or mild steel, and the circular arc displacement limiting steel plate (31) is made of high strength steel.

6. The pure bending multi-stage energy dissipation damper according to claim 1, characterized in that: The cross-sectional shape of the bent energy-absorbing steel plate (2) is a rectangular or box-shaped cross-section.

7. The pure bending multi-stage energy dissipation damper according to claim 1, characterized in that: The left connecting end plate (301) and the right connecting end plate (103) of the pure bending multi-stage energy dissipation damper are respectively connected to two diagonal positions of the frame structure through hinged supports.

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