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Large-amplitude vertical and torsional coupling free vibration test device for bridges in natural wind field

A vibration test, large amplitude technology, applied in vibration test, aerodynamic test, measurement device, etc., to solve the effect of high blocking rate, reduce safety hazards, and small footprint

Pending Publication Date: 2019-09-06
DALIAN UNIV OF TECH
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method that can effectively solve the bottleneck problem faced by the current wind tunnel test method in response to the needs of the vertical and torsional coupling large-amplitude free vibration test of the main girder segment model in the wind resistance design of the bridge. A test device for large-amplitude coupled free vibration under different wind directions in a good natural wind field

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  • Large-amplitude vertical and torsional coupling free vibration test device for bridges in natural wind field

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specific Embodiment approach

[0015] Such as figure 1 As shown, the large-amplitude vertical and torsional coupling free vibration test device of the bridge in the natural wind field includes a rigid model 1, a first light and high-strength string 2, a first linear tension spring 3, a rigid support 4, a first spring guard Tube 5, turntable 6, rigid column 7, motor 8, second light and high-strength string 9, second linear tension spring 10, gravity block 11, second spring casing 12, rigid thin round rod 13 and the third light High quality and strong long thin rope 14. The rigid model 1 is connected to the lower end of the first linear tension spring 3 through the first light and high-strength string 2, and the upper end of the first linear tension spring 3 is suspended on the rigid support 4; the first linear tension spring 3 is placed on the first spring In the casing 5, the first linear tension spring 3 is prevented from being subjected to wind load; the first spring casing 5 is fixed on the rigid suppor...

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Abstract

The invention provides a large-amplitude vertical and torsional coupling free vibration test device for bridges in a natural wind field. The large-amplitude vertical and torsional coupling free vibration test device comprises a rigid model, lightweight high-strength strings, linear tension springs, a rigid bracket, spring protecting tubes, a turntable, a rigid stand column, a motor, gravity blocksand a rigid thin round rod. By utilizing the large-amplitude vertical and torsional coupling free vibration test device, a bridge rigidity model free vibration test can be effectively conducted in the natural wind field without large wind tunnel equipment, and the size of a test model is not limited by the size of a wind tunnel, thus a large-scale model test can be realized. Compared with the traditional wind tunnel testing method, the large-amplitude vertical and torsional coupling free vibration test device can greatly reduce the geometric nonlinearity in the case of large amplitude vibrations, can solve the problem of excessive blocking rate in the large amplitude vibration wind tunnel test, thereby being suitable for studying large amplitude vibrations; and by utilizing the turntable,the wind deflection angle of the model can be adjusted very easily, further the wind resistance of the bridges at different wind deflection angles can be studied comprehensively and conveniently, andthe large-amplitude vertical and torsional coupling free vibration test device is more convenient than the traditional wind tunnel test.

Description

technical field [0001] The invention relates to a test device for studying the wind-induced large-scale vertical and torsional coupling free vibration of a large-scale main girder rigid model of a bridge in a natural wind field instead of a wind tunnel laboratory. The spring suspends the large-scale rigid model on the turntable of the tower standing in a good natural wind field, and the motor drives the turntable to drive the suspension system to adjust the deflection angle of the rigid model relative to the natural wind direction, thereby simulating the relative wind direction of the actual bridge girder attitude. Because it is placed in a natural wind field, the size of the model is basically unlimited, so large-scale model tests can be realized. In addition, compared with the traditional wind tunnel test method, this device has many advantages such as easy realization of large amplitude, arbitrary wind deflection angle, energy saving, and no need to occupy a wind tunnel la...

Claims

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Application Information

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IPC IPC(8): G01M9/00G01M7/02
CPCG01M9/00G01M7/02G01M7/00G01M9/04G01M7/027
Inventor 许福友张明杰马召宇
Owner DALIAN UNIV OF TECH
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