CN112281641B

CN112281641B - Grid damping support

Info

Publication number: CN112281641B
Application number: CN202011109742.XA
Authority: CN
Inventors: 肖俊华; 程小亮; 刘宇闻
Original assignee: Wisdri Engineering and Research Incorporation Ltd; Wisdri Urban Construction Engineering Technology Co Ltd
Current assignee: Wisdri Engineering and Research Incorporation Ltd; Wisdri Urban Construction Engineering Technology Co Ltd
Priority date: 2020-10-16
Filing date: 2020-10-16
Publication date: 2022-06-03
Anticipated expiration: 2040-10-16
Also published as: CN112281641A

Abstract

The invention discloses a grid damping support which comprises a grid damper, an elastic support body, a top plate and a bottom plate, wherein the elastic support body is arranged on the top plate; the grating damper is a hollow shell with openings at two ends, and the shell is made of steel; the shell is provided with a plurality of weakening holes; the elastic support body is embedded in the shell of the grating damper; the lower port of the shell is arranged on the bottom plate and fixedly connected with the bottom plate, and the lower end face of the elastic support body is in contact with the upper surface of the bottom plate; the upper port of the shell is fixedly connected with the top plate, and the upper end face of the elastic supporting body is contacted with the lower panel of the top plate. The invention has the beneficial effects that: the steel grating damper is manufactured by utilizing the high ductility of low-yield steel and the weakening holes in a certain number and shapes, and the novel seismic mitigation and isolation support is manufactured by combining the damper and the elastic support body, and has stronger energy consumption capability and a damping effect in both horizontal directions.

Description

Grid damping support

Technical Field

The invention relates to the field of shock absorption of bridge engineering and constructional engineering, in particular to a grid damping support.

Background

Buildings and bridges serve as important public building structures and play an important role in national production and life, and in order to protect the buildings from being damaged by earthquakes, the earthquake resistance of the structures is generally improved by a method of additionally arranging an earthquake reduction and isolation device in practical engineering.

At present, seismic isolation and reduction supports are often adopted in bridges and building structures for damping, and the traditional seismic isolation and reduction supports comprise lead core rubber supports, friction pendulum supports, high-damping rubber supports and the like. However, the lead core rubber support and the high-damping rubber support have the problems of heavy metal pollution, small horizontal rigidity and performance degradation in service period; the friction pendulum support has the problems that the friction force is difficult to control, vertical displacement can be generated during the swinging, and the like. In addition, the traditional seismic isolation and reduction supports do not have the anti-pulling function, and some additional structures are needed to achieve the anti-pulling effect. Therefore, there is a need for improvements in the art.

Disclosure of Invention

The invention aims to provide a steel grating damper support which is good in fatigue resistance and has a vertical pulling-resistant function, aiming at the defects of the prior art.

The technical scheme adopted by the invention is as follows: a grid damping support comprises a grid damper, an elastic support body, a top plate and a bottom plate; the grating damper is a hollow shell with openings at two ends, and the shell is made of steel; the shell is provided with a plurality of weakening holes; the elastic support body is embedded in the shell of the grating damper; the lower port of the shell is arranged on the bottom plate and fixedly connected with the bottom plate, and the lower end face of the elastic support body is in contact with the upper surface of the bottom plate; and the upper port of the shell is fixedly connected with the top plate.

According to the scheme, the weakening holes are round holes, elliptical holes, polygonal holes or vertically arranged shuttle-shaped holes.

According to the scheme, the weakening holes are arranged in at least one circle at equal intervals along the axial direction of the shell, and the weakening holes in the same circle are distributed at equal intervals in the circumferential direction.

According to the scheme, the outer peripheral surface of the bottom of the shell is provided with an annular boss; a limiting ring is fixed on the bottom plate, a clamping groove is formed in the inner circumferential surface of the limiting ring and the upper surface of the bottom plate, the clamping groove is matched with the annular boss, and the annular boss is clamped into the clamping groove.

According to the scheme, the height of the clamping groove is larger than that of the annular boss, after the annular boss is clamped into the clamping groove, a vertical gap is reserved between the annular boss and the inner wall of the limiting ring, and the annular boss and the limiting ring can move vertically relative to each other.

According to the scheme, the center of the bottom plate protrudes upwards to form a pedestal matched with the inner cavity of the shell, and the pedestal extends into the inner cavity of the shell.

According to the scheme, the elastic support body is formed by sequentially and alternately laminating a plurality of steel plates and a plurality of rubber sheets, and the steel plates are connected with the rubber sheets in a bonding mode.

According to the scheme, the outer wall of the grid damper is wrapped with the tightening belt.

According to the scheme, the tightening belt can be a flexible steel wire, a steel strand or a steel belt.

The invention has the beneficial effects that:

1. the energy consumption ability is stronger, and horizontal rigidity is great: the invention utilizes the high ductility of low yield steel, uses the steel with low yield strength to manufacture the grating damper, and the shell is provided with weakening holes to form the variable stiffness steel damper with weak middle and strong two ends, the energy consumption capability is stronger, and the damping function is realized in the horizontal two directions; meanwhile, the steel grating damper has higher horizontal shear rigidity, so that the longitudinal and transverse rigidity of the bridge under the normal use condition is ensured, and the longitudinal and transverse displacement generated by the main beam is smaller when the vehicle brakes.

2. The durability is better: according to the invention, the height of the clamping groove is greater than that of the annular boss, after the annular boss is clamped into the clamping groove, a vertical gap is reserved between the annular boss and the inner wall of the limiting ring, so that a certain vertical relative displacement can be generated between the grille damper and the bottom plate, the grille damper does not bear a vertical load in service, and the fatigue damage of the grille damper is eliminated.

3. No rotation constraint on the main beam: the steel grating damper is not in direct contact with the bottom plate, can generate certain vertical relative displacement relative to the bottom plate, and meanwhile, the elastic support body can generate certain elastic deformation while bearing vertical load, so that the top plate can generate a certain corner relative to the bottom plate, and the influence of the bending moment of the main beam on the bridge pier can be eliminated.

4. Limiting and beam falling preventing functions: the top plate and the bottom plate are connected through the grating damper, and the grating damper has the functions of limiting and preventing beams from falling due to the constraint effect of the grating damper.

5. The manufacturing and maintenance cost is lower: the invention has lower manufacturing and maintenance cost because of lower steel cost and simple processing.

6. The energy consumption performance is stable: the invention designs the tightening belt, and due to the tightening effect of the tightening belt, the tight-fitting state between the steel damper and the elastic support body is ensured under the earthquake condition, and the hysteretic energy consumption capability of the damper is more stable.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a partially-cut schematic view of the present embodiment.

Fig. 3 is a half-sectional view schematically illustrating the present embodiment.

Fig. 4 is a schematic structural view of the grille damper in this embodiment.

Fig. 5 is a schematic view of the elastic support body of this embodiment in a split state.

Fig. 6 is a schematic structural view of the tightening strap of this embodiment.

Fig. 7 is a schematic structural diagram of the bottom plate in the present embodiment.

Fig. 8 is a schematic structural view of the stop collar of the present embodiment.

Wherein: 1-top plate, 2-bottom plate, 3-grid damper, 31-weakening hole, 32-annular boss, 4-elastic support body, 41-steel plate, 42-rubber sheet, 5-limiting ring and 6-tightening belt.

Detailed Description

For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings.

The grating damping support shown in fig. 1-3 comprises a grating damper 3, an elastic support body 4, a top plate 1 and a bottom plate 2; the grille damper 3 is a hollow shell with openings at two ends, and the shell is made of steel, as shown in fig. 3; the shell is provided with a plurality of weakening holes 31; the elastic supporting body 4 is embedded in the shell of the grille damper 3; the lower port of the shell is arranged on the bottom plate 2 and fixedly connected with the bottom plate 2, and the lower end face of the elastic support body 4 is in contact with the upper surface of the bottom plate 2; the upper port of the shell is fixedly connected with the top plate 1, and the upper end surface of the elastic support body 4 can be in contact with the lower panel of the top plate 1.

Preferably, the weakening holes 31 are round holes, elliptical holes, polygonal holes or vertically arranged shuttle-shaped holes; the weakening holes 31 are arranged at least one circle at equal intervals along the axial direction of the shell, and the weakening holes 31 in the same circle are distributed at equal intervals along the circumferential direction.

Preferably, as shown in fig. 4, the outer peripheral surface of the bottom of the shell is provided with an annular boss 32; a limiting ring 5 is fixed on the bottom plate 2 (as shown in fig. 8), a clamping groove is formed on the inner circumferential surface of the limiting ring 5 and the upper surface of the bottom plate 2, the clamping groove is matched with the annular boss 32, and the annular boss 32 is clamped in the clamping groove to realize radial positioning of the grid damper 3 and the limiting ring 5. Preferably, the cross section of the limiting ring 5 is of an inverted L shape, the minimum distance between the inner wall of the limiting ring and the upper surface of the base plate 2 is greater than the thickness of the annular boss 32 of the steel grating damper 3, that is, the height of the clamping groove is greater than the height of the annular boss 32, after the annular boss 32 is clamped into the clamping groove, a vertical gap is left between the annular boss 32 and the inner wall of the limiting ring 5, and the two can move vertically relative to each other.

Preferably, as shown in fig. 7, the center of the bottom plate 2 protrudes upward to form a pedestal matched with the inner cavity of the housing, and the pedestal extends into the inner cavity of the housing.

Preferably, as shown in fig. 5, the elastic support 4 is formed by alternately laminating a plurality of steel plates 41 and a plurality of rubber sheets 42 in sequence, and the steel plates 41 and the rubber sheets 42 are bonded to each other.

Preferably, as shown in fig. 6, the outer wall of the grill damper 3 is wrapped with a tightening band 6, and the tightening band 6 may be a flexible steel wire, a steel strand or a steel band.

In this embodiment, the casing of the grille damper 3 is made of a low-yield steel material (a steel material having a yield strength not higher than 235 MPa) having a low yield strength and a good ductility. The housing of the grille damper 3 is a cylindrical structure.

The core of the invention is that: 1. the application of the grid damper 3 made of low-yield steel; 2. use of an elastic support 4. The low yield steel has the characteristics of good fatigue resistance and strong deformability, and has strong energy consumption capability after yield. The invention designs a grid damper 3 based on the performance characteristics of low yield steel, and the principle is that a variable stiffness structure with weakest rigidity at the middle position and gradually increased rigidity at the upper end and the lower end is obtained by arranging weakening holes 31 on a shell; when the upper end and the lower end of the shell are subjected to horizontal and vertical loads, the specific part of the shell can be subjected to fixed-point yielding. Under the action of an earthquake, the pier beams can move relatively, the top plate 1 and the bottom plate 2 can also move relatively, so that the shearing deformation of the grille damper 3 is driven, the opening part on the shell can be subjected to yielding and plastic deformation to dissipate earthquake energy, and the damage of the earthquake to the bridge and a building structure is reduced.

The bridge girder can produce certain downwarping under the load effect, can take place certain relative rotation this moment between the roof 1 and the bottom plate 2 of support, so need consider the relative rotation demand between the two in the support design. In the invention, the steel plate 41 and the rubber sheet 42 are overlapped and bonded to form the integral elastic supporting body 4 by utilizing the better deformability of the rubber sheet 42, and the integral elastic supporting body has stronger vertical supporting rigidity and can meet certain rotation requirements between the top plate and the bottom plate 2.

It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that modifications can be made to the technical solutions described in the above-mentioned embodiments, or equivalent substitutions of some technical features, but any modifications, equivalents, improvements and the like within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A grid damping support is characterized by comprising a grid damper, an elastic support body, a top plate and a bottom plate; the grating damper is a hollow shell with openings at two ends, and the shell is made of steel; the shell is provided with a plurality of weakening holes; the elastic support body is embedded in the shell of the grating damper; the lower port of the shell is arranged on the bottom plate and fixedly connected with the bottom plate, and the lower end surface of the elastic support body is in contact with the upper surface of the bottom plate; the upper port of the shell is fixedly connected with the top plate; the weakening holes are arranged in at least one circle at equal intervals along the axial direction of the shell, and the weakening holes in the same circle are distributed at equal intervals along the circumferential direction; the outer wall of the grid damper is wrapped with a tightening belt.

2. The grid damping mount as set forth in claim 1 wherein said weakening holes are round holes, elliptical holes, polygonal holes or vertically arranged shuttle-shaped holes.

3. The grid damping mount of claim 1 wherein the housing bottom peripheral surface is provided with an annular boss; a limiting ring is fixed on the bottom plate, a clamping groove is formed in the inner circumferential surface of the limiting ring and the upper surface of the bottom plate, the clamping groove is matched with the annular boss, and the annular boss is clamped into the clamping groove.

4. The grid damping support according to claim 3, wherein the height of the clamping groove is greater than that of the annular boss, and after the annular boss is clamped into the clamping groove, a vertical gap is left between the annular boss and the inner wall of the limiting ring, and the annular boss and the limiting ring can move vertically relative to each other.

5. The grid damping mount as set forth in claim 1 wherein the floor projects upwardly from the center thereof to form a pedestal adapted to fit within the interior of the housing, the pedestal extending into the interior of the housing.

6. The grid damping mount according to claim 1 wherein the resilient support is formed by a plurality of steel plates and a plurality of rubber sheets alternately stacked one on top of the other, the steel plates and the rubber sheets being bonded together.

7. The grid dampening mount as set forth in claim 1, wherein the tightening strap is a flexible steel wire, strand or band.