CN110258301A - A kind of anti-buckling support device of assembled for improving anti-seismic performance of beam bridge - Google Patents

Abstract

The invention 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, 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 at 180° to each other 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 invention 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-dissipating 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 invention relates to an energy dissipation support of a bridge structure, 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;

SUMMARY OF THE INVENTION

In order to overcome the problems of the existing anti-buckling bracing, such as the inconvenience of replacing the inner core, the poor restraint capacity of the restraining unit, the insufficient seismic performance, and the heavy concrete wet work workload, the present invention provides an all-steel assembled anti-buckling bracing with good energy consumption performance. , 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 and instability of the inner core, and giving full play to the energy-dissipating capacity of the 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 present invention 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 invention 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 according to the present invention;

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

3 is an exploded view of the structure of the external restraint component of the assembled anti-buckling support device for improving the seismic performance of bridges according to the present invention;

4 is a front view of the assembled anti-buckling support device 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 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 for improving the seismic performance of the bridge 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.

specific implementation

The present invention 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, several 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 lug plates 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 invention, and the purpose thereof is to enable those who are familiar with the art to understand the content of the present invention and implement accordingly, and cannot limit the protection scope of the present invention by this. All equivalent changes or modifications made according to the spirit of the present invention should be included within the protection scope of the present invention.

Claims (10)

1. an assembled anti-buckling support device for improving the seismic performance of bridges, characterized in that: comprising an energy dissipation unit, an external restraint unit, and an end connection unit; The outer restraint unit has an inner wall of a cross-shaped cross-section, the energy dissipation unit is a cross-shaped mild steel inner core (201), and the energy dissipation unit is clamped in the inner wall of the cross-shaped cross-section of the outer restraint unit. Bolt holes are provided at both ends of the profiled mild steel inner core (201), and the energy dissipation unit is connected with the end connecting unit through bolts. 2. An assembled anti-buckling support device for improving the seismic performance of bridges according to claim 1, characterized in that: the external restraint unit comprises a U-shaped steel groove (101), a diaphragm (102), a side The lateral restraint plate (103) and the cover plate (104); the lateral restraint plate (103) is welded in the U-shaped steel groove (101), and the diaphragm (102) is longitudinally arranged in the U-shaped steel groove (101), In order to increase the lateral rigidity of the lateral restraint plate (103), two cover plates (104) are covered on the upper part of the U-shaped steel groove (101) to form an outer restraint part, and the two above-mentioned outer restraint parts are bolted together at 180° to form Outer constraint element. 3. An assembled anti-buckling support device for improving the seismic performance of bridges according to claim 2, characterized in that: the height-to-thickness ratio of the U-shaped steel groove (101) should meet the requirements of local stability, and the length and thickness should be thin. The 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). 4. An assembled anti-buckling support device for improving the seismic performance of bridges according to claim 2, characterized in that a spacer (105) is arranged between the outer restraint components, and the spacer (105) is slightly thicker The thickness is greater than that of the cross-shaped mild steel inner core (201) to ensure that there is a gap between the cross-shaped mild steel inner core (201) and the inner wall of the outer restraint unit. 5. The assembled anti-buckling support device for improving the seismic performance of bridges according to claim 4, characterized in that: in the gap between the cross-shaped mild steel inner core (201) and the inner wall of the outer restraint unit A layer of unbonded material is filled (202). 6. The assembled anti-buckling support device for improving the seismic performance of bridges according to claim 1, characterized in that: the cross-section of the cross-shaped mild steel inner core (201) is more constrained than the non-constrained overhanging section. The section is small to ensure that the unconstrained extension section of the cross-shaped mild steel inner core (201) will not be damaged before the constraint section under the action of seismic force. 7. An assembled anti-buckling support device for improving the seismic performance of bridges according to claim 1, characterized in that: the end connecting unit comprises a cross-shaped connecting piece (301), a connecting plate (302) , ear plate (303), pin (304), upper structure anchor plate (305), lower structure anchor plate (306), one side of the connecting plate (302) is welded with a cross-shaped connector (301), and the other A lug plate (303) is welded on one side, and two lug plates (303) are respectively welded on the upper structure anchor plate (305) and the lower structure anchor plate (306). The gap between the two lugs (303) on the anchor plate (306) of the lower structure is slightly larger than the thickness of the lugs (303) on the connecting plate (302). 8. An assembled anti-buckling support device for improving the seismic performance of bridges according to claim 7, characterized in that: bolt holes are provided on the lugs (303), and the connecting plates are connected by pins (304). The lugs (303) on the (302) are connected with the lugs (303) on the upper structure anchor plate (305) and the lower structure anchor plate (306), ensuring the free rotation of the end connecting unit. 9. The assembled anti-buckling support device for improving the seismic performance of bridges according to claim 7, characterized in that: the cross-shaped connector (301) is provided with a cross-shaped mild steel inner core (201) The bolt holes corresponding to the bolt holes at the ends connect the cross-shaped connector (301) to the end of the cross-shaped mild steel inner core (201) through friction-type high-strength bolts. The assembled anti-buckling support device for improving the seismic performance of bridges according to claim 7, characterized in that: the end of the cross-shaped connector (301) is kept with the end of the U-shaped steel groove (101). A certain distance can realize the free tension and compression of the cross-shaped mild steel inner core under the action of earthquake, so as to achieve the effect of energy dissipation.