CN212030865U - Bridge damage and damage simulation device under action of near fault seismic oscillation - Google Patents
Bridge damage and damage simulation device under action of near fault seismic oscillation Download PDFInfo
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- CN212030865U CN212030865U CN202021012142.7U CN202021012142U CN212030865U CN 212030865 U CN212030865 U CN 212030865U CN 202021012142 U CN202021012142 U CN 202021012142U CN 212030865 U CN212030865 U CN 212030865U
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Abstract
The utility model provides a bridge damage and destruction simulator under the action of near fault earthquake motion, wherein the bottom plate of a soil body box comprises a movable steel plate and a fixed steel plate; the movable steel plate is a movable plate and is in flexible connection with the gaps on the sides close to the periphery by canvas; the four corners of the bottom surface of the movable steel plate are respectively fixed with the upper parts of the connecting devices; two counter-force steel plates are fixedly arranged at the bottom of the base, and the lower part of the connecting device and the angle support are respectively fixed at the two ends of each counter-force steel plate; the top of the actuator is hinged with the upper part of the connecting device, and the bottom of the actuator is hinged with the lower part of the connecting device; the angle support supports the actuator at a set angle. And (4) jacking the actuator, pushing the movable steel plate to lift the soil body in the upper soil body box at a set angle and set speed, and simulating the near fault earthquake motion generated by the lifting of the soil body on the disc on the earthquake mid-reverse fault. The utility model discloses a near fault seismic oscillation that the analysis produced further develops the research of true bridge damage failure mechanism to bridge model's influence.
Description
Technical Field
The utility model relates to a seismic test technical field specifically is a bridge damage destruction analogue means under nearly fault earthquake motion.
Background
The bridge is an important component of a traffic line, is an important traffic means for crossing special terrains such as mountains, ravines, rivers and the like, and is particularly suitable for western regions with complex terrain conditions in China. Meanwhile, the plate structures in the western region have strong activity, the fault distribution is wide, the earthquake activity is frequent, and the bridge is often close to or directly spans the active fault. Numerous studies have shown that sudden dislocation of active faults is the major source of earthquake generation, and that the active faults along the lines are the areas of most severe building damage and personal injury. When an earthquake occurs, the bridge serving as an important transportation hub is damaged, so that huge direct loss can be caused, and adverse effects can be brought to post-disaster rescue and material transportation. Therefore, the method has important significance for researching the damage and damage mechanism of the bridge under the action of the earthquake motion of the near fault.
The near fault seismic motion as a special seismic motion has the characteristics of directional effect, sliding impact effect, high-amplitude pulse effect and the like. At present, research means for bridge damage under the action of near-fault earthquake motion are mainly divided into three categories, namely earthquake damage instance investigation, model test and theoretical analysis. The model test is visual and controllable and is convenient for data acquisition, so that the method is an important research means. The utility model provides a normal gravity scale model test device based on this research direction.
Most of common normal gravity scale model test devices at present are vibration table tests or artificial seismic source tests, and the common normal gravity scale model test devices have the following problems: (1) the size of the model is limited to a vibration table or other loading platforms, and the scale is large; (2) the method is difficult to accurately simulate the near fault earthquake motion generated by real fault dislocation, and the characteristics of the near fault earthquake motion cannot be well reflected; (3) the input variable cannot be conveniently adjusted to carry out tests under a plurality of different working conditions, so that test analysis under different conditions is realized.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to current test device not enough, provide a bridge damage destruction analogue means under the nearly fault seismic action of jumbo size, variable angle, solved the above-mentioned defect that current test device exists betterly.
In order to realize the purpose of the utility model, the utility model discloses the technical scheme who takes as follows:
the bridge damage and damage simulation device under the action of near fault seismic motion comprises a soil box, a base, an actuator, a connection and a bridge model; the bridge model comprises a bridge main body and a bridge foundation; the bridge foundation is positioned in the soil box;
two front side walls of the box body of the soil body box are transparent, and a bottom plate is arranged on the bottom surface of the box body;
the bottom plate comprises a movable steel plate and a fixed steel plate; the fixed steel plate is fixed at the bottom of the soil box, the movable steel plate is a movable plate, and the movable steel plate is flexibly connected with the gaps on the adjacent sides around by canvas; the bottom of the movable steel plate is provided with a double-layer steel plate clamping a cross beam, and four corners of the bottom surface of the movable steel plate are respectively fixed with the upper parts of the connecting devices;
the bottom of the base is fixedly provided with two counter-force steel plates, the counter-force steel plates are tightly contacted with the ground, and the lower part of the connecting device and the angle support are respectively fixed at two ends of each counter-force steel plate;
the actuator is arranged in the base and positioned below the soil box; the top of the actuator is hinged with the upper part of the connecting device, and the bottom of the actuator is hinged with the lower part of the connecting device; the angle support supports the actuator at a set angle.
The angle support comprises two steel plates which are provided with bevel edges and are welded in parallel, a thick steel plate is fixed on each bevel edge, a circular arc-shaped steel block with the radius being consistent with that of the actuator is arranged on each thick steel plate, and the circular arc-shaped steel block and the actuator are in contact with each other to support the actuator.
The simulation method of the bridge damage simulation device under the action of the near fault seismic motion comprises the following steps:
installing an actuator at a set angle, supporting the actuator by an angle support, then filling clay or other soil in a soil box, tamping the soil in layers according to the required compactness, and burying sensors such as a soil pressure gauge and an accelerometer at different positions in the soil according to a test scheme in the process of filling the soil in layers;
after the soil is filled, burying a bridge foundation of the bridge model into the soil according to a preset position, and sticking strain gauges or other sensors on key parts of the bridge foundation and a bridge main body; a displacement sensor and a camera equipment monitoring instrument are placed on the upper surface of the soil body;
when the test is started, the time control actuator jacks at a set speed, the fault moves in a staggered manner, and the overlying soil layer is displaced and broken to generate earthquake motion;
collecting and recording data of each sensor in the process by using a data acquisition system; observing and analyzing the test phenomenon and recording by shooting;
and (3) changing the type or arrangement position of the sensor or changing fault dislocation parameters (loading angle, loading speed and the like) and bridge model parameters according to the test scheme.
Compared with the prior art, the utility model has the advantages of:
(1) the self-designed large-size model device has obvious test phenomenon, strong operability and repeatability, and the experimental result is in actual accordance with the previous research and experience;
(2) according to a specially designed loading principle, the movable steel plate is pushed by the synchronous jacking actuator, so that the fracture of an overlying soil body caused by the dislocation of a movable fault is simulated, and the relevant characteristics of seismic oscillation of a near fault are met;
(3) meanwhile, a fault dislocation model and a bridge model are combined, and the fault dislocation model can be matched with an angle support through a connecting device to conveniently change the loading direction of an actuator; the bridge model foundation is buried in a soil layer, and the position, the buried depth and the type of the bridge can be changed according to a test scheme, so that the damage and damage mechanism research of the bridge under the action of near-fault earthquake motion under different working conditions can be carried out.
Drawings
FIG. 1 is a front view of the test apparatus according to the embodiment of the present invention;
figure 2 is a top view of a soil box according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a loading platform according to an embodiment of the present invention;
fig. 4 is a top view of a base according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a connecting device according to an embodiment of the present invention;
FIG. 6 is a schematic view of a support device according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a bridge model according to an embodiment of the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
As shown in fig. 1, the simulation device for bridge damage and destruction under the action of near-fault seismic motion comprises a soil box 1, a base 2, an actuator 3, a connection and a bridge model; as shown in fig. 7, the bridge model includes a bridge main body 10 and a bridge foundation 11; the bridge foundation 11 is positioned in the soil body box 1;
two front side walls of the box body of the soil body box 1 are transparent, and a bottom plate is arranged on the bottom surface;
the soil body box 1 is a container of soil and is a rectangular body, and the frame is formed by welding and building 12 square steel bars; a steel plate having 15mm thick both side surfaces; the two front-view surfaces are double-layer organic glass, the thickness of the organic glass is 12mm, the test phenomenon can be conveniently and directly observed, and the strength is ensured; the upper surface is not shielded to facilitate soil loading and unloading, and the bottom surface is provided with a bottom plate. The frame of the soil body box 1 is fixed on the base 2 by high-strength bolts.
As shown in fig. 2 and 3, the bottom plate comprises a movable steel plate 7 and a fixed steel plate 8; the fixed steel plate 8 is fixed at the bottom of the soil body box 1, the movable steel plate 7 is a movable plate, and is flexibly connected with the gaps on the sides adjacent to the periphery by canvas; the bottom of the movable steel plate 7 is provided with a double-layer steel plate clamping a cross beam, and four corners of the bottom surface of the movable steel plate 7 are respectively fixed with the upper parts 4 of the connecting devices.
The movable steel plate 7 is a loading plate, the periphery of the movable steel plate is movable, and the movable steel plate is flexibly connected with the adjacent side gaps at the periphery through canvas, so that the soil is prevented from falling in the loading process. The bottom of the movable steel plate 7 is a double-layer steel plate clamping a cross beam, so that the steel plate is prevented from deforming excessively in the loading process, and synchronous and stable loading is ensured.
Two counter-force steel plates 9 are fixedly arranged at the bottom of the base 2, the counter-force steel plates 9 are tightly contacted with the ground, and as shown in fig. 4, the lower part 5 of the connecting device and the angle support 6 are respectively fixed at two ends of each counter-force steel plate 9;
the actuator 3 is arranged in the base 2 and is positioned below the soil box 1; the top of the actuator 3 is hinged with the upper part 4 of the connecting device, and the bottom is hinged with the lower part 5 of the connecting device; the angle support 6 supports the actuator 3 at a set angle;
as shown in fig. 5 and 6, the base 2 is a frame made of 120mm square steel with a thickness of 8mm, two reaction steel plates 9 are welded on the base and are in close contact with the ground, and the reaction steel plates 9 are used for fixing the lower part 5 of the connecting device and the angle support 6 conveniently and providing reaction support for the actuator 3 to lift up the soil. The reason why the ground is not directly used as a counter-force support is that the base 2 is pushed to move by the jacking process of the actuator 3.
As shown in fig. 6 the angle support 6 comprises two steel plates parallel welded with bevel edges, the bevel edges are fixed with thick steel plates, the thick steel plates are provided with arc-shaped steel blocks with the radius consistent with that of the actuator, the arc-shaped steel blocks contact with the actuator 3 to support the actuator 3, and the contact area is increased to prevent the actuator 3 from being damaged.
Fig. 6 shows a 70 ° angle support, the angle support 6 serving to control the direction of the loading, since the upper connecting device part 4, the lower connecting device part 5 and the actuator 3 are all articulated. The angle support 6 is specially designed because of the large stress. The angle support 6 is formed by welding two 6mm thick steel plates in parallel, and a 2cm thick steel plate is welded on the bevel edge. For this purpose, the angle support 6 is in contact with the actuator 3 with a steel block in the shape of a circular arc having a radius corresponding to the radius of the actuator 3. The angle support 6 is fixedly connected with a reaction steel plate 9.
When the angle needs to be adjusted, the upper connecting device part 4 is removed from the movable steel plate 7, and the angle support 6 is removed from the counterforce steel plate 9. The bottom connection of the actuator 3 is unchanged, the direction of the actuator 3 is adjusted, the upper part 4 of the new connecting device and the angle support 6 are installed, and the angle adjustment can be completed.
And after the soil is filled, burying the bridge model foundation 11 in a soil layer according to a test scheme. The structure type, the foundation burial depth, the distance to a fault position and the like of the bridge model can be correspondingly adjusted according to different research purposes, and different working conditions are researched.
The utility model discloses a function mode does: the movable steel plate 7 plays a role in bearing and pushing a soil body, the four actuators 3 are synchronously lifted, the movable steel plate 7 is pushed under the support of the counterforce steel plate 9 and the angle support 6 to lift the soil body in the upper soil body box 1 at a set angle and set speed, and therefore near-fault earthquake motion (the soil body lifting side is an upper plate, and the immovable side is a lower plate) generated by lifting of the upper plate soil body on the reverse fault in the earthquake is simulated. The research of a real bridge damage failure mechanism is further developed by analyzing the influence of the generated near-fault earthquake motion on the bridge model.
Specifically, the bridge damage and damage simulation device under the action of the seismic motion of the near fault comprises the following steps:
installing an actuator 3 at a set angle, supporting the actuator by an angle support 6, then loading clay or other soil mass into the soil box 1, tamping the soil in layers according to the required compactness, and embedding sensors such as a soil pressure gauge, an accelerometer and the like into different positions in the soil according to a test scheme in the process of loading the soil in layers;
after the filling of the soil is finished, burying a bridge foundation 11 of the bridge model into the soil according to a preset position, and pasting strain gauges or other sensors on key parts of the bridge foundation 11 and a bridge main body 10; a displacement sensor and a camera equipment monitoring instrument are placed on the upper surface of the soil body;
when the test is started, the time control actuator 3 lifts up at a set speed, the fault moves in a staggered way, and the overlying soil layer is displaced and broken to generate earthquake motion;
collecting and recording data of each sensor in the process by using a data acquisition system; observing and analyzing the test phenomenon and recording by shooting;
and (3) changing the type or arrangement position of the sensor or changing fault dislocation parameters (loading angle, loading speed and the like) and bridge model parameters according to the test scheme.
It will be appreciated by those of ordinary skill in the art that the examples described herein are intended to assist the reader in understanding the manner of practicing the invention, and it is to be understood that the scope of the invention is not limited to such specific statements and examples. Those skilled in the art can make various other specific modifications and combinations based on the teachings of the present invention without departing from the spirit of the invention, and such modifications and combinations are still within the scope of the invention.
Claims (2)
1. The device for simulating the damage and the damage of the bridge under the action of the near-fault earthquake motion is characterized by comprising a soil body box (1), a base (2), an actuator (3), a connection and a bridge model; the bridge model comprises a bridge main body (10) and a bridge foundation (11); the bridge foundation (11) is positioned in the soil body box (1);
two front side walls of the box body of the soil body box (1) are transparent, and a bottom plate is arranged on the bottom surface;
the bottom plate comprises a movable steel plate (7) and a fixed steel plate (8); the fixed steel plate (8) is fixed at the bottom of the soil body box (1), the movable steel plate (7) is a movable plate, and is in flexible connection with the gaps on the sides adjacent to the periphery by canvas; the bottom of the movable steel plate (7) is provided with a double-layer steel plate clamping a cross beam, and four corners of the bottom surface of the movable steel plate (7) are respectively fixed with the upper parts (4) of the connecting devices;
two reaction steel plates (9) are fixedly arranged at the bottom of the base (2), the reaction steel plates (9) are tightly contacted with the ground, and the lower part (5) of the connecting device and the angle support (6) are respectively fixed at the two ends of each reaction steel plate (9);
the actuator (3) is arranged in the base (2) and is positioned below the soil box (1); the top of the actuator (3) is hinged with the upper part (4) of the connecting device, and the bottom of the actuator is hinged with the lower part (5) of the connecting device; the angle support (6) supports the actuator (3) at a set angle.
2. The device for simulating the damage of the bridge under the action of the near fault seismic motion of claim 1, wherein the angle support (6) comprises two steel plates with oblique edges which are welded in parallel, a thick steel plate is fixed on the oblique edges, an arc-shaped steel block with the radius consistent with that of the actuator is arranged on the thick steel plate, and the arc-shaped steel block is in contact with the actuator (3) to support the actuator (3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021012142.7U CN212030865U (en) | 2020-06-05 | 2020-06-05 | Bridge damage and damage simulation device under action of near fault seismic oscillation |
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| CN202021012142.7U CN212030865U (en) | 2020-06-05 | 2020-06-05 | Bridge damage and damage simulation device under action of near fault seismic oscillation |
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| CN212030865U true CN212030865U (en) | 2020-11-27 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111521364A (en) * | 2020-06-05 | 2020-08-11 | 防灾科技学院 | Bridge damage and damage simulation device under action of near fault seismic motion and simulation method thereof |
| CN115541156A (en) * | 2022-09-02 | 2022-12-30 | 防灾科技学院 | Device and method for simulating fracture resistance test of building structure under action of cross-fault |
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2020
- 2020-06-05 CN CN202021012142.7U patent/CN212030865U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111521364A (en) * | 2020-06-05 | 2020-08-11 | 防灾科技学院 | Bridge damage and damage simulation device under action of near fault seismic motion and simulation method thereof |
| CN115541156A (en) * | 2022-09-02 | 2022-12-30 | 防灾科技学院 | Device and method for simulating fracture resistance test of building structure under action of cross-fault |
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