阅读说明：本技术 一种变截面屈服l形金属阻尼器 (Variable cross-section yielding L-shaped metal damper ) 是由 黄海新 何金玮 潘首成 于 2020-07-17 设计创作，主要内容包括：本发明为一种变截面屈服L形金属阻尼器,该阻尼器包括：L形耗能钢板、推拉板、限位板、底板、连接板；限位板1刚度大于L形耗能钢板刚度；限位板通过底板固定在桥梁盖梁结构上；所述限位板内设置有具有圆弧段和平直段的滑槽,L形耗能钢板置于限位板的滑槽内；L形耗能钢板伸出滑槽的一端通过推拉板、连接板固定在桥梁主梁结构上。通过不同截面的逐次屈服进行耗能,有效避免了一般金属阻尼器核心耗能构件应力集中问题；同时采用L型耗能钢板在限位板内的弯曲变形,且分段弯曲变形耗能,抗疲劳性能更好,不会出现某单点应力集中的现象。(The invention is a variable cross-section yielding L-shaped metal damper, which comprises: the energy-consuming device comprises an L-shaped energy-consuming steel plate, a push-pull plate, a limiting plate, a bottom plate and a connecting plate; the rigidity of the limiting plate 1 is greater than that of the L-shaped energy consumption steel plate; the limiting plate is fixed on the bridge capping beam structure through the bottom plate; the limiting plate is internally provided with a sliding chute with an arc section and a flat section, and the L-shaped energy consumption steel plate is arranged in the sliding chute of the limiting plate; one end of the L-shaped energy dissipation steel plate extending out of the sliding chute is fixed on the bridge girder structure through a push-pull plate and a connecting plate. Energy consumption is carried out through successive yielding of different sections, and the problem of stress concentration of core energy consumption components of a common metal damper is effectively avoided; meanwhile, the L-shaped energy dissipation steel plate is adopted to be bent and deformed in the limiting plate, the sectional bending deformation energy dissipation is realized, the fatigue resistance is better, and the phenomenon of stress concentration of a certain single point cannot occur.)

1. A variable cross-section yielding L-shaped metal damper, characterized in that the damper comprises: the energy-consuming device comprises an L-shaped energy-consuming steel plate, a push-pull plate, a limiting plate, a bottom plate and a connecting plate; the rigidity of the limiting plate is greater than that of the L-shaped energy dissipation steel plate; the limiting plate is fixed on the bridge capping beam structure through the bottom plate; the limiting plate is internally provided with a sliding chute with an arc section and a flat section, and the L-shaped energy consumption steel plate is arranged in the sliding chute of the limiting plate; one end of the L-shaped energy dissipation steel plate extending out of the sliding chute is fixed on the bridge girder structure through a push-pull plate and a connecting plate.

2. The variable cross-section yielding L-shaped metal damper as claimed in claim 1, wherein the L-shaped energy dissipation steel plate is formed by cutting and bending a whole steel plate, and comprises two straight steel plates and one arc steel plate, and two ends of the arc steel plate are connected with the straight steel plates to make the whole L-shaped steel plate; the straight section and the circular arc section of the L-shaped energy dissipation steel plate can generate elastic-plastic deformation when sliding in the limiting plate.

3. The variable cross-section yielding L-shaped metal damper as recited in claim 1, wherein the three sections of the L-shaped dissipative steel sheet have the same thickness.

4. The variable cross-section yielding L-shaped metal damper as claimed in claim 1, wherein the limiting plate is formed by cutting and welding steel plates, the lower surface of the limiting plate is fixed with the bottom plate, a sliding groove for accommodating the L-shaped energy dissipation steel plate is formed between the limiting plate and the bottom plate, the shape and the size of the sliding groove are consistent with those of the L-shaped energy dissipation steel plate, and the L-shaped energy dissipation steel plate can slide in the limiting plate and generate elastic-plastic deformation when external strong force is applied.

5. The variable cross-section yielding L-shaped metal damper as recited in claim 1, wherein the L-shaped dissipative steel plate is arranged perpendicular to the base plate.

6. The variable cross-section yielding L-shaped metal damper as claimed in claim 1, wherein the single-limb L-shaped metal damper comprises an L-shaped energy-consuming steel plate, a push-pull plate, a limiting plate, a bottom plate, a connecting plate and a plurality of high-strength bolts, and can work independently; the double-limb and multi-limb L-shaped metal damper can be assembled according to actual requirements to form the double-limb and multi-limb L-shaped metal damper.

7. The variable cross-section yielding L-shaped metal damper as claimed in claim 6, wherein two adjacent L-shaped energy dissipation steel plates are oppositely arranged or back to back arranged during assembly.

8. The yielding L-shaped metal damper with variable cross-section as claimed in claim 1, wherein the working principle and the working flow of the metal damper are as follows: when the structure is displaced under the action of an earthquake, the load is transmitted through a push-pull plate connected with the structure and drives an L-shaped energy dissipation steel plate, and the L-shaped energy dissipation steel plate is restrained by a limiting plate and slides in a sliding groove of the limiting plate to generate elastic-plastic deformation; the L-shaped energy consumption steel plate can yield at first under the action of a strong earthquake to form a yield section a and a yield section b, then the yield section moves in the opposite direction along with the movement of the L-shaped energy consumption steel plate, and the position of the yield section continuously flows and changes in the moving process of the L-shaped energy consumption steel plate, namely the yielding of the variable section of the damper is gradually realized.

Technical Field

The invention relates to the technical field of bridge engineering, in particular to a variable cross-section yielding L-shaped metal damper.

Background

In recent years, earthquake disasters at home and abroad cause certain casualties and engineering structure damage, and a bridge is used as a pivotal engineering of a traffic life line and effective earthquake-proof measures must be taken to ensure the smoothness of the bridge in earthquake relief and disaster area reconstruction. Most bridge structures in the existing bridge earthquake resistance only utilize concrete stop blocks to limit the transverse displacement of an upper beam body, and the stop blocks only have a limiting function and do not have energy consumption capacity and cannot conform to the structural vibration control idea of converting passive resistance into active energy dissipation; in the longitudinal direction, longitudinal anti-falling beam dampers are mostly adopted, and the conventional metal dampers mostly have the defects of small design displacement, poor fatigue resistance, complex manufacturing and installation and the like, and are difficult to be well suitable for the anti-falling beam problem of the bridge structure. Therefore, it is necessary to design a damper with good energy consumption capability and a limiting function for bridge engineering.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to solve the technical problem of providing a variable-section yielding L-shaped metal damper.

The technical scheme for solving the technical problem of the device is to provide a variable cross-section yielding L-shaped metal damper, which is characterized by comprising the following components in parts by weight: the energy-consuming device comprises an L-shaped energy-consuming steel plate, a push-pull plate, a limiting plate, a bottom plate and a connecting plate; the rigidity of the limiting plate is greater than that of the L-shaped energy dissipation steel plate; the limiting plate is fixed on the bridge capping beam structure through the bottom plate; the limiting plate is internally provided with a sliding chute with an arc section and a flat section, and the L-shaped energy consumption steel plate is arranged in the sliding chute of the limiting plate; one end of the L-shaped energy dissipation steel plate extending out of the sliding chute is fixed on the bridge girder structure through a push-pull plate and a connecting plate.

The L-shaped energy dissipation steel plate is formed by cutting and bending a whole steel plate, and consists of two straight section steel plates and one arc section steel plate, and two ends of the arc section steel plate are connected with the straight section steel plates to enable the whole steel plate to be in an L-shaped shape; the straight section and the circular arc section of the L-shaped energy dissipation steel plate can generate elastic-plastic deformation when sliding in the limiting plate.

The thickness of three sections of steel plates of the L-shaped energy dissipation steel plate is the same.

The limiting plate is formed by cutting and welding steel plates, the lower surface of the limiting plate is fixed with the bottom plate, a sliding groove for containing the L-shaped energy dissipation steel plate is formed between the limiting plate and the bottom plate, the shape and the size of the sliding groove are consistent with those of the L-shaped energy dissipation steel plate, and the L-shaped energy dissipation steel plate can slide in the limiting plate and generate elastic-plastic deformation when external strong force is applied.

The L-shaped energy dissipation steel plate is perpendicular to the bottom plate.

The single-limb L-shaped metal damper comprises an L-shaped energy consumption steel plate, a push-pull plate, a limiting plate, a bottom plate, a connecting plate and a plurality of high-strength bolts, and can work independently; the double-limb and multi-limb L-shaped metal damper can be assembled according to actual requirements to form the double-limb and multi-limb L-shaped metal damper.

When in assembly, two adjacent L-shaped energy consumption steel plates are oppositely arranged or back to back.

The working principle and the working process of the metal damper are as follows: when the structure is displaced under the action of an earthquake, the load is transmitted through a push-pull plate connected with the structure and drives an L-shaped energy dissipation steel plate, and the L-shaped energy dissipation steel plate is restrained by a limiting plate and slides in a sliding groove of the limiting plate to generate elastic-plastic deformation; the L-shaped energy consumption steel plate can yield at first under the action of a strong earthquake to form a yield section a and a yield section b, then the yield section moves in the opposite direction along with the movement of the L-shaped energy consumption steel plate, and the position of the yield section continuously flows and changes in the moving process of the L-shaped energy consumption steel plate, namely the yielding of the variable section of the damper is gradually realized.

Compared with the prior art, the invention has the beneficial effects that:

(1) the variable cross-section yielding L-shaped metal damper consumes energy through successive yielding of different cross sections, and the problem of stress concentration of core energy consumption components of a common metal damper is effectively solved. Meanwhile, the L-shaped energy dissipation steel plate is adopted to be bent and deformed in the limiting plate, the sectional bending deformation energy dissipation is realized, the fatigue resistance is better, and the phenomenon of stress concentration of a certain single point cannot occur.

(2) The variable cross-section yielding L-shaped metal damper can be assembled in a modularized mode according to energy consumption requirements, different anti-seismic displacement design requirements of structures are met, and good limiting and anti-seismic energy dissipation effects can be achieved on the bridge anti-falling beam. The two layers are combined and spliced, on one hand, the installation and splicing modularization is realized, on the other hand, the L-shaped metal damper can be increased or decreased according to different anti-seismic displacement design requirements, and different forms of single limb, double limbs and multiple limbs can be formed.

(3) The variable cross-section yielding L-shaped metal damper is simple in structure, small in size, low in cost and convenient to install, common steel materials can be selected, and the variable cross-section yielding L-shaped metal damper is a reliable and ideal energy dissipation element.

(4) The damper has the energy consumption principle that the displacement of the structure drives the L-shaped energy consumption steel plate to move in the limiting plate, and the limiting plate causes the L-shaped energy consumption steel plate to deform to consume energy, but the damper does not adopt the stretching or compressing principle, so that even if the structure displacement is large, the energy consumption can be met as long as the length of the L-shaped energy consumption steel plate is enough, and the damper has larger displacement compared with other dampers under the same condition. Meanwhile, due to the arrangement of the limiting plate, the energy consumption mode and the effect can be obviously displayed, the energy consumption mode is more stable, and the deformation rule can be strictly controlled.

Drawings

FIG. 1 is a schematic view of a single-limb structure of a variable-section yielding L-shaped metal damper of the invention.

FIG. 2 is a schematic diagram of a variable cross-section yielding L-shaped metal damper with two limbs.

Fig. 3 is a schematic structural view of an L-shaped energy dissipation steel plate.

FIG. 4 is a schematic view of the working mechanism of the variable cross-section yielding L-shaped metal damper of the present invention. (in the figure: 1, limiting plate; 2, L-shaped energy consumption steel plate; 3, bottom plate; 4, high-strength bolt; 5, bolt hole; 6, push-pull plate; 7, connecting plate)

Detailed Description

Specific examples of the present invention are given below, and the specific examples are only for further illustrating the present invention in detail, and do not limit the scope of protection of the present application.

The invention provides a variable cross-section yielding L-shaped metal damper (damper for short, see figures 1-3) comprising: the energy-consuming steel plate comprises an L-shaped energy-consuming steel plate 2, a push-pull plate 6, a limiting plate 1, a bottom plate 3, a high-strength bolt 4 and a connecting plate 7; the L-shaped energy consumption steel plate 2 is arranged in the limiting plate 1, and the rigidity of the limiting plate 1 is greater than that of the L-shaped energy consumption steel plate 2; the limiting plate 1 is fixed on the bottom plate 3 through a high-strength bolt 4; the bottom plate 3 is fixed on the bridge capping beam structure through a high-strength bolt 4; one end of the L-shaped energy consumption steel plate 2 is welded with the push-pull plate 6 to form a whole; the L-shaped energy consumption steel plate 2 is vertically fixed with the push-pull plate 6, and the push-pull plate 6 is connected with the connecting plate 7 through high-strength bolts with corresponding specifications; the connecting plate 7 is fixed on the bridge girder structure through high-strength bolts with corresponding specifications.

The L-shaped energy dissipation steel plate 2 is formed by cutting and bending a whole steel plate, and consists of two straight section steel plates and one arc section steel plate, wherein two ends of the arc section steel plate are connected with the straight section steel plates, so that the whole steel plate is L-shaped, and the thicknesses of the three sections of steel plates are the same; the straight section and the arc section of the L-shaped energy dissipation steel plate 2 can be subjected to elastic-plastic deformation when sliding in the limiting plate 1, the L-shaped energy dissipation steel plate inevitably moves along the clamping groove in the limiting plate when moving in the limiting plate, and the rigidity of the limiting plate is far higher than that of the energy dissipation steel plate, so that plastic deformation is generated.

The limiting plate 1 is formed by cutting and welding steel plates and comprises a straight section and an arc section, the lower surface of the limiting plate is fixed with the bottom plate, a sliding groove for containing the L-shaped energy consumption steel plate is formed between the limiting plate and the bottom plate, the shape and the size of the sliding groove are consistent with those of the L-shaped energy consumption steel plate, and the L-shaped energy consumption steel plate can slide in the limiting plate and generate elastic-plastic deformation when external strong force is applied.

The single-limb L-shaped metal damper comprises an L-shaped energy consumption steel plate 2, a push-pull plate 6, a limiting plate 1, a bottom plate 3, a connecting plate 7 and a plurality of high-strength bolts 4, and can work independently; the steel plate can be assembled according to actual requirements to form a double-limb and multi-limb L-shaped metal damper, a plurality of L-shaped energy-consuming steel plates arranged side by side and a combined structure of a limiting plate can be fixed on a bottom plate during assembly, then the bottom plate is fixed with a bridge capping beam structure, and meanwhile, push-pull plates connected with the plurality of L-shaped energy-consuming steel plates arranged side by side are connected with a strip-shaped connecting plate 7 and are fixed with a bridge girder structure through the connecting plate.

When the two L-shaped energy consumption steel plates 2 are assembled, the two adjacent L-shaped energy consumption steel plates can be arranged oppositely (as shown in figure 2) and also can be arranged back to back.

The variable cross section of the variable cross section yielding L-shaped metal damper mainly means that the position of the yielding cross section is continuously changed.

The invention relates to a variable cross-section yielding L-shaped metal damper, which has the working principle and the working process that: when the structure is displaced under the action of an earthquake, the load is transmitted through the push-pull plate 6 connected with the structure and drives the L-shaped energy dissipation steel plate 2, and the L-shaped energy dissipation steel plate 2 is restrained by the limiting plate 1 and slides in the sliding groove of the limiting plate 1 to generate elastic-plastic deformation. As shown in fig. 4, taking the moving direction in the figure as an example, the L-shaped energy-consuming steel plate 2 yields first under the action of a strong earthquake to form a yield section a and a yield section b, and then the boundary section moves in the opposite direction along with the movement, the second state in fig. 4 is that the section c behind the boundary section a in the arc section and the section d behind the boundary section b in the straight section yield, and then the section e behind the section c and the section f behind the section d yield, it is seen that the position of the yield section continuously changes in the moving process of the L-shaped energy-consuming steel plate 2, that is, the yielding of the variable section of the damper is achieved gradually, the flow of the section macroscopically shows the alternate transformation of the straight section and the arc section, that is, a certain section position of the arc section of the original L-shaped energy-consuming steel plate enters the straight section of the limiting plate under the action of an external force, at the moment, a certain section of the straight section of the original L-shaped energy dissipation steel plate can enter the arc section of the limiting plate and continuously flow and change, the interface of the L-shaped energy dissipation steel plate near the arc section of the limiting plate is straight and changes alternately with the arc, and the working mechanism is the same when the L-shaped energy dissipation steel plate moves in the opposite direction. The alternation of the sections realizes and strengthens the elastic-plastic deformation energy consumption capability and the fatigue resistance of the damper.

Nothing in this specification is said to apply to the prior art.