CN210712520U - Assembled buckling-restrained brace device for improving anti-seismic performance of bridge - Google Patents

Abstract

The utility model relates to an assembled anti-buckling support device for improving the seismic performance of bridges, comprising: an energy dissipation unit, an external restraint unit and an end connecting unit. The energy dissipation unit is composed of cross-shaped mild steel; the external restraint unit includes U-shaped steel channel, transverse diaphragm, lateral restraint plate, and cover plate. The lateral restraint plate is welded in the steel channel, and the transverse diaphragm is arranged longitudinally in the U-shaped steel channel. Inside, two cover plates cover the upper part of the U-shaped steel groove to form an outer restraint part, and the two above-mentioned outer restraint parts are bolted to each other at 180° to form an outer restraint unit, and clamp the cross-shaped mild steel inner core; the end connecting unit includes: The ear plate, the connecting plate, the pin shaft and the upper and lower structural anchor plates are used to connect the support device to the pier and the bridge respectively. The utility model facilitates the replacement of the energy-consuming inner core, and the lateral rigidity of the outer restraint unit is large, thereby significantly improving the energy-consuming capacity of the inner core. The device can improve the seismic performance of the bridge structure.

Description

A prefabricated anti-buckling bracing device for improving the seismic performance of bridges

technical field

The utility model relates to an energy dissipation support for bridge structures, in particular to an assembled anti-buckling support device for improving the seismic performance of bridges.

Background technique

The anti-buckling bracing has a full hysteretic curve and good energy dissipation effect. It can effectively absorb external vibration energy through tension and compression deformation. It is widely used in the field of civil engineering to improve the seismic performance of buildings and structures. In recent years, anti-buckling bracing has been gradually applied to the field of bridge engineering as a shock absorption and energy dissipation device.

At present, the traditional anti-buckling support is filled with concrete between the inner core and the casing, the outer surface of the inner core is covered with an unbonded layer, and the concrete acts as a restraint unit to prevent the lateral buckling instability of the inner core under compression, but the traditional support devices mainly exist The following problems: the workload of concrete wet work is relatively large; the concrete is easily crushed as a restraint element, which cannot achieve the purpose of restraint, resulting in small elastic deformation of the energy-consuming inner core when it is compressed, which is prone to buckling instability and serious degradation of the support energy-dissipating function; The inner core is not easy to disassemble, the replacement frequency is high, and the maintenance cost is high;

Utility model content

In order to overcome the problems of inconvenient replacement of the inner core of the existing anti-buckling support, poor restraint capacity of the restraining unit, insufficient seismic performance, and heavy concrete wet work workload, the utility model provides an all-steel assembled anti-buckling type with good energy consumption performance. Support, avoid concrete wet operation, greatly facilitate the replacement and disassembly of the energy-consuming inner core, and the lateral rigidity of the outer restraint unit is large, preventing the lateral buckling instability of the inner core, and giving full play to the energy dissipation capacity of steel. The support device has the advantages of convenient installation, small installation space, excellent energy consumption performance and good durability, and is suitable for improving the seismic performance of bridge engineering structures.

In order to realize the above-mentioned functions, the technical scheme provided by the present invention is:

The assembled anti-buckling support device for improving the seismic performance of the bridge includes an energy dissipation unit, an outer restraint unit, and an end connection unit; the outer restraint unit has an inner wall with a cross-shaped section, and the energy dissipation unit is a cross The soft steel inner core is made of Q235 steel and is clamped in the cross-shaped inner wall of the assembled outer restraint unit. The two ends of the cross-shaped mild steel inner core are provided with bolt holes, which are connected to the end connecting unit through bolts.

The outer restraint unit includes a U-shaped steel groove, a diaphragm, a lateral restraint plate, a cover plate, a spacer, and a high-strength bolt. The lateral restraint plate is welded in the steel groove, the diaphragm is longitudinally arranged in the U-shaped steel groove to increase the lateral rigidity of the restraint plate, and the two cover plates cover the upper part of the U-shaped steel groove to form a closed external restraint part, The two above-mentioned outer restraint components are mutually formed at 180° and are bolted to form an outer restraint unit, which realizes the assembled assembly of the outer restraint unit and facilitates the replacement and disassembly of the cross-shaped mild steel inner core.

The end connecting unit includes a cross-shaped connecting piece, a connecting plate, an ear plate, a pin shaft, an upper structure anchor plate, and a lower structure anchor plate. The upper and lower structural anchor plates are welded with two lugs respectively, and the gap between the two lugs is slightly larger than the thickness of the lugs on the connecting plate.

Further, the height-to-thickness ratio of the U-shaped steel channel should meet the requirements of local stability, and the slenderness ratio should meet the requirements of overall stability. Specifically, it should meet the relevant provisions of the "Code for Design of Steel Structures" (GB50017-2017).

Preferably, a spacer is arranged between the two outer restraining components, and the thickness of the spacer is slightly larger than the thickness of the cross-shaped mild steel inner core limb to ensure that there is a gap between the cross-shaped mild steel inner core and the inner wall of the outer restraining unit.

Further, the gap between the cross-shaped mild steel inner core and the inner wall of the outer restraint unit is filled with a non-bonded material layer.

Preferably, the cross section of the cross-shaped mild steel inner core is smaller than that of the unconstrained overhanging section, so as to ensure that the unconstrained overhanging section of the cross-shaped mild steel inner core does not break before the limiting section under the action of seismic force.

Preferably, bolt holes are provided on the lug plate, and the lug plate on the connecting plate is connected with the lug plate on the upper and lower structural anchor plates through a pin, so as to ensure the free rotation of the end of the support device.

Preferably, the cross-shaped connector is provided with bolt holes corresponding to the bolt holes at the end of the cross-shaped mild steel inner core, and the cross-shaped connector is connected with the end of the cross-shaped mild steel inner core with the friction type high-strength bolts. On the one hand, the replacement and disassembly of the cross-shaped mild steel inner core is convenient, and on the other hand, the unconstrained extension of the cross-shaped mild steel inner core is strengthened, and the premature buckling failure of the unconstrained extension is avoided.

Further, the end of the cross-shaped connector is kept at a certain distance from the end of the U-shaped steel groove, so as to realize the free stretching and compression of the inner core of the cross-shaped mild steel under the action of earthquake, so as to achieve the effect of energy dissipation.

Preferably, the anchor plate of the upper structure is connected with the lower surface of the bridge; the anchor plate of the lower structure is connected with the pier.

Compared with the prior art, the utility model has the following beneficial effects:

1) The diaphragm is welded in the U-shaped steel channel at a certain distance in the longitudinal direction, which increases the lateral restraint capacity of the outer restraint unit; under the action of seismic load, the cross-shaped mild steel core is difficult to side To buckling instability, the tensile and compressive deformation of the inner core is fully exerted, the seismic energy received by the structure is dissipated, the replacement frequency of the inner core is reduced, and the maintenance cost is reduced;

2) The prefabricated external restraint unit is connected by bolts, which greatly facilitates the replacement of the energy-consuming inner core after the earthquake, and the prefabricated external restraint unit can be used multiple times, reducing the project cost;

3) The device has a simple manufacturing process and process, avoids concrete wet work, and improves the durability of the support device.

Description of drawings

Hereinafter, the present utility model will be described in more detail based on the embodiments and with reference to the accompanying drawings to make its features, functions and advantages more intuitive, wherein:

Fig. 1 is the overall schematic diagram of the assembled anti-buckling support device for improving the seismic performance of bridges of the present invention;

Fig. 2 is the structural exploded view of the assembled anti-buckling support device for improving the seismic performance of bridges of the present invention;

Fig. 3 is the structural exploded view of the outer restraint part of the assembled anti-buckling support device used for improving the seismic performance of bridges of the present invention;

Fig. 4 is the front view of the assembled anti-buckling support device used for improving the seismic performance of bridges according to the present invention;

Fig. 5 is the sectional view of the assembled anti-buckling support device used for improving the seismic performance of bridges according to the present invention;

6 is a schematic diagram of the installation arrangement of the assembled anti-buckling support device used for improving the seismic performance of bridges according to the present invention;

The marks in the figure are: 101 is a U-shaped steel channel, 102 is a diaphragm, 103 is a lateral restraint plate, 104 is a cover plate, 105 is a spacer, 106 is a high-strength bolt, 201 is a cross-shaped mild steel inner core, 301 is a cross connector, 302 is a connecting plate, 303 is an ear plate, 304 is a pin, 305 is an anchor plate of the upper structure, 306 is an anchor plate of the lower structure, 1 is an assembled anti-buckling support device, 2 is a bridge , 3 is the bridge pier.

Detailed ways

The present utility model will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that, for those skilled in the art, some modifications and improvements can be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

As shown in Figures 1 to 6, the assembled anti-buckling bracing device for improving the seismic performance of bridges in this example includes an energy dissipation unit, an external restraint unit, and an end connection unit. The energy consumption unit is a cross-shaped mild steel inner core 201, and the material of the cross-shaped mild steel inner core 201 is Q235 steel; the outer restraint unit includes a U-shaped steel channel 101, a transverse partition plate 102, a lateral restraint plate 103, a cover plate 104, a pad Block 105, high-strength bolts 106; the end connecting unit includes a cross-shaped connector 301, a connecting plate 302, an ear plate 303, a pin 304, an upper structure anchor plate 305, and a lower structure anchor plate 306. Among them, two lateral restraint plates 103 are welded longitudinally in the U-shaped steel groove 101, the distance between the two lateral restraint plates 103 is greater than the thickness of the cross-shaped mild steel inner core 201, and the diaphragm 102 is longitudinally arranged on the U-shaped steel Between the side plate of the groove 101 and the lateral restraint plate 103, in order to increase the lateral rigidity of the side restraint plate 103, two cover plates 104 cover the upper part of the U-shaped steel groove 101 to form a closed outer restraint part. The outer restraint components are bolted at 180° to each other through high-strength bolts 106 to form an outer restraint unit, which realizes the assembly of the outer restraint unit, facilitates the replacement and disassembly of the cross-shaped mild steel inner core 201, and the inner wall of the cross-shaped section is formed inside the outer restraint unit. The cross-shaped mild steel inner core 201 is clamped in the inner wall of the cross-shaped section of the outer restraint unit, and the two ends of the cross-shaped mild steel inner core 201 are provided with bolt holes, which are connected to the end connecting unit by bolts. One side of the connecting plate 302 is welded with a cross-shaped connector 301, and the other side is welded with a lug plate 303. The upper structure anchor plate 305 and the lower structure anchor plate 306 are welded with two lugs 303 respectively. The upper structure anchor plate 305 , The gap between the two ear plates 303 on the anchor plate 306 of the lower structure is slightly larger than the thickness of the ear plate 303 on the connecting plate 302 .

In this embodiment, the height-to-thickness ratio of the U-shaped steel channel 101 should meet the requirements of local stability, and the slenderness ratio should meet the requirements of overall stability.

In this embodiment, a cushion block 105 is arranged between the two outer restraint components, and the thickness of the cushion block 105 is slightly larger than the thickness of the cross-shaped mild steel inner core 201 to ensure that there is a space between the cross-shaped mild steel inner core 201 and the inner wall of the outer restraint unit. void.

Further, in the present embodiment, the gap between the cross-shaped mild steel inner core 201 and the inner wall of the outer restraint unit is filled with a non-bonded material layer 202 to reduce the size of the cross-shaped mild steel inner core 201 and the lateral restraint plate 103 and the cover plate. The frictional resistance between 104 realizes the energy consumption of tensile and compressive deformation of the cross-shaped mild steel inner core 201 under the action of earthquake.

Preferably, the cross section of the cross-shaped mild steel inner core 201 in this embodiment is smaller than the cross section of the unconstrained overhanging section, so as to ensure that the unconstrained overhanging section of the cross-shaped mild steel inner core does not break before the constraining section under the action of seismic force.

In this embodiment, bolt holes are provided on the lug plate 303, and the lug plate 303 on the connecting plate 302 is connected with the lug plate 303 on the upper structure anchor plate 305 and the lower structure anchor plate 306 through the pin shaft 304, so as to ensure the support Free rotation of the device end.

In this embodiment, the cross-shaped connector 301 is provided with bolt holes corresponding to the bolt holes at the end of the cross-shaped mild steel inner core 201, and the cross-shaped connector 301 is connected to the cross-shaped mild steel inner core 201 with the friction type high-strength bolts. The ends are connected, on the one hand, the replacement and disassembly of the cross-shaped mild steel inner core 201 is convenient, and on the other hand, the unconstrained extension of the cross-shaped mild steel inner core 201 is strengthened, and the premature buckling failure of the unconstrained extension is avoided.

Further, in this embodiment, the end of the cross-shaped connector 301 is kept at a certain distance from the end of the U-shaped steel channel 101, so as to realize the free tension and compression of the cross-shaped mild steel inner core 201 under the action of earthquake, so as to achieve the effect of energy dissipation.

In this embodiment, the upper structure anchor plate 305 of the fabricated anti-buckling support 1 is connected to the lower surface of the bridge 2 , and the lower structure anchor plate 306 is connected to the surface of the bridge pier 3 .

A prefabricated anti-buckling support device for improving the seismic performance of bridges provided by this specific embodiment, the main working process of which is as follows:

Under the action of the seismic load, the longitudinal relative displacement occurs between the bridge 2 and the pier 3, and the cross-shaped mild steel inner core 201 is deformed by the load from the bridge system. 201 can only produce axial tensile and compressive deformation, and the seismic energy can be dissipated through the hysteresis of mild steel to improve the seismic performance of the bridge. After the earthquake, by disassembling the high-strength bolts 106 on the cover plate 104 and the end bolts of the cross-shaped mild steel inner core 201, the cross-shaped mild steel inner core 201 can be easily disassembled and replaced. repair and routine maintenance. It is worth noting that in this embodiment, the device layout shown in Figure 6 is arranged horizontally along the longitudinal direction of the bridge, which can improve the longitudinal seismic performance of the bridge.

The above-mentioned embodiments are only intended to illustrate the technical concept and characteristics of the present utility model, and the purpose thereof is to enable persons familiar with the art to understand the contents of the present utility model and implement them accordingly, and cannot limit the protection scope of the present utility model with this. All equivalent changes or modifications made according to the spirit of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. The utility model provides a fabricated buckling restrained brace device for improving bridge anti-seismic performance which characterized in that: the energy-saving device comprises an energy consumption unit, an external constraint unit and an end part connecting unit;

the external restraint unit is provided with an inner wall with a cross-shaped cross section, the energy dissipation unit is a cross-shaped soft steel inner core (201), the energy dissipation unit is clamped in the inner wall with the cross-shaped cross section of the external restraint unit, bolt holes are formed in two ends of the cross-shaped soft steel inner core (201), and the energy dissipation unit is connected with the end part connecting unit through bolts.

2. The fabricated buckling-restrained brace device for improving seismic performance of a bridge as claimed in claim 1, wherein: the external constraint unit comprises a U-shaped steel groove (101), a diaphragm plate (102), a lateral constraint plate (103) and a cover plate (104); the lateral restraint plate (103) is welded in the U-shaped steel groove (101), the diaphragm plate (102) is longitudinally arranged in the U-shaped steel groove (101) to increase the lateral rigidity of the lateral restraint plate (103), the two cover plates (104) cover the upper part of the U-shaped steel groove (101) to form an external restraint part, and the two external restraint parts are bolted at an angle of 180 degrees to each other to form an external restraint unit.

3. The fabricated buckling-restrained brace device for improving seismic performance of a bridge as claimed in claim 2, wherein: the height-thickness ratio and the slenderness ratio of the U-shaped steel groove (101) should meet the relevant regulations of 'steel structure design specifications' (GB 50017-2017).

4. The fabricated buckling-restrained brace device for improving seismic performance of a bridge as claimed in claim 2, wherein: the cushion blocks (105) are arranged between the external constraint components, the thickness of the cushion blocks (105) is slightly larger than that of the cross-shaped mild steel inner core (201), and a gap is reserved between the cross-shaped mild steel inner core (201) and the inner wall of the external constraint unit.

5. The fabricated buckling-restrained brace device for improving seismic performance of a bridge as claimed in claim 4, wherein: and a non-adhesive material layer (202) is filled in a gap between the cross-shaped mild steel inner core (201) and the inner wall of the outer constraint unit.

6. The fabricated buckling-restrained brace device for improving seismic performance of a bridge as claimed in claim 1, wherein: the cross-shaped mild steel inner core (201) is smaller in section of a constrained section than an unconstrained extended section, and the unconstrained extended section of the cross-shaped mild steel inner core (201) is not damaged before the constrained section under the action of seismic force.

7. The fabricated buckling-restrained brace device for improving seismic performance of a bridge as claimed in claim 1, wherein: the end connecting unit comprises a cross connecting piece (301), a connecting plate (302), lug plates (303), a pin shaft (304), an upper structure anchor plate (305) and a lower structure anchor plate (306), wherein the cross connecting piece (301) is welded on one side of the connecting plate (302), the lug plates (303) are welded on the other side of the connecting plate, the two lug plates (303) are respectively welded on the upper structure anchor plate (305) and the lower structure anchor plate (306), and gaps between the two lug plates (303) on the upper structure anchor plate (305) and the lower structure anchor plate (306) are slightly larger than the thickness of the lug plates (303) on the connecting plate (302).

8. The fabricated buckling-restrained brace device for improving seismic performance of a bridge as claimed in claim 7, wherein: bolt holes are formed in the ear plates (303), the ear plates (303) on the connecting plate (302) are connected with the ear plates (303) on the upper structure anchor plate (305) and the lower structure anchor plate (306) through pin shafts (304), and free rotation of the end connecting unit is guaranteed.

9. The fabricated buckling-restrained brace device for improving seismic performance of a bridge as claimed in claim 7, wherein: bolt holes corresponding to the bolt holes at the end part of the cross mild steel inner core (201) are formed in the cross connecting piece (301), and the cross connecting piece (301) is connected with the end part of the cross mild steel inner core (201) through friction type high-strength bolts.

10. The fabricated buckling-restrained brace device for improving seismic performance of a bridge as claimed in claim 7, wherein: the end part of the cross-shaped connecting piece (301) keeps a certain distance from the end part of the U-shaped steel groove (101), so that the cross-shaped soft steel inner core can be freely stretched and compressed under the action of an earthquake, and the energy consumption effect is achieved.

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