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A long-span bridge seismic response time history analysis method

A technology of seismic response and time history analysis, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as huge time consumption, and achieve the effect of improving solution efficiency and ensuring calculation stability.

Pending Publication Date: 2019-03-08
李鲁
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  • Application Information

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Problems solved by technology

Because the long-span bridge model has a large number of degrees of freedom, the time step is selected too short, the seismic input time remains unchanged, and the total number of time steps is too large, which results in a huge time-consuming analysis process.

Method used

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  • A long-span bridge seismic response time history analysis method
  • A long-span bridge seismic response time history analysis method
  • A long-span bridge seismic response time history analysis method

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Embodiment Construction

[0064] The present invention will be further described below in conjunction with specific examples, but the present invention is not limited to these specific implementations. Those skilled in the art will realize that the present invention covers all alternatives, modifications and equivalents as may be included within the scope of the claims.

[0065] Below in conjunction with accompanying drawing, structural principle and working principle of the present invention are specifically described:

[0066] Taking a long-span bridge structure as an example, the dynamic time-history analysis method of the present invention is specifically described, a certain long-span suspension cable-stayed composite bridge such as figure 1 As shown, the bridge is a self-anchored cable-stayed-suspension cooperative system bridge. Regardless of the bridge approach, the span of the bridge is: 132m+400m+132m=664m, and the specific structure is as follows: (1) Main girder: adopts an integral cast-in...

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Abstract

The invention relates to a long-span bridge seismic response time history analysis method. The method comprises the following steps of performing THE spatial finite element discretization on a bridgestructure; establishing a finite element model of a bridge structure, wherein a main beam, a skew tower, a stay cable, a main cable and other components all adopt Euler beam units, adopting a Rayleighdamping matrix, deriving a motion equation set of a discrete system according to the Hamilton principle, and calculating the equivalent inertia force according to input acceleration; 2 selecting a time step length, wherein the time step length is n times of an acceleration recording time interval; 3 calculating time step by step, and calculating displacement, speed and acceleration of each time step. The dynamic time history analysis method has the advantages of high-order precision, high calculation efficiency and the like, false high-frequency oscillation caused by spatial dispersion can becompletely filtered out, and the dynamic time history analysis method is very suitable for solving the rigidity problem of a long-span bridge.

Description

technical field [0001] The invention relates to a long-span bridge seismic response time-history analysis method, in particular to a dynamic time-history analysis method with unconditional stability, high-order precision and optimal numerical damping for calculating the response of a long-span bridge under earthquake action. Background technique [0002] The bridge is the pivotal project of the transportation system and an important part of the lifeline project. To ensure the safety and normal use of the bridge in the earthquake is of great significance to the earthquake disaster prevention work and post-earthquake restoration and reconstruction work of cities and regions. In the design stage, numerical simulation methods are often used to analyze bridges under earthquakes to ensure the safety of bridge structures under sudden strong earthquakes. For the convenience of calculation, some methods such as bottom shear method and response spectrum method have been proposed. How...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 徐俊杰李鲁
Owner 李鲁
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