Reliability analysis-based foundation seismic isolation structure system optimization method

A technology for basic isolation and optimization methods, applied in design optimization/simulation, instrumentation, geometric CAD, etc., and can solve the problem of high cost

Active Publication Date: 2021-01-15
TONGJI UNIV
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for optimizing the base isolation structure system based on reliabili

Method used

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  • Reliability analysis-based foundation seismic isolation structure system optimization method
  • Reliability analysis-based foundation seismic isolation structure system optimization method
  • Reliability analysis-based foundation seismic isolation structure system optimization method

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Experimental program
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Effect test

Embodiment 1

[0073] This embodiment provides a method for optimizing a base-isolation structure system based on reliability analysis, including the following steps:

[0074] Reliability calculation steps: calculate the random seismic response of the base-isolated structural system through the dynamic equation, as a random variable; according to the equivalent extreme value event criterion, construct the dynamic reliability of the base-isolated structural system based on the structural response physical quantity concerned degree calculation process; according to the dynamic reliability calculation process combined with the motion control equation, using the probability density evolution theory, using the probability density evolution equation to solve, calculate the overall reliability of the base isolation structure system;

[0075] The step of optimizing the parameters of the base-isolated structure system: constructing a probability criterion based on the overall reliability of the base-i...

Embodiment approach

[0101] As a preferred implementation, the method for optimizing the base isolation structure system also includes:

[0102] The step of determining key design parameters: through variance sensitivity analysis, calculate the total effect index of each random input variable of the base isolation structure system, and use the random input variable with the highest total effect index as the key design parameter; the total effect index includes The individual contribution of a random input variable to the corresponding variance of the structure and its cross-contribution with other random input variables;

[0103] In the step of optimizing the parameters of the base isolation structure system, parameter optimization is performed on the key design parameters.

[0104] In the key design parameter determination step, the calculation expression of the total effect index of the random input variable is:

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[0111] In t...

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Abstract

The invention relates to a reliability analysis-based foundation seismic isolation structure system optimization method, which comprises the following steps of: 1) calculating random seismic responseof a foundation seismic isolation structure under a seismic action according to a probability density evolution theory; (2) converting a first-time reliability exceeding solving problem into a probability density function solving problem of an equivalent extremum variable by utilizing an equivalent extremum event criterion, and solving a corresponding probability density function by utilizing a probability density evolution theory so as to obtain the dynamic reliability of the whole structure; 3) determining key design parameters in the seismic isolation support restoring force model through variance sensitivity analysis; and 4) constructing a probability criterion taking the overall reliability of the basic seismic isolation structure system as a constraint and a target, and performing parameter optimization on the key design parameters by adopting a genetic algorithm so as to optimize the basic seismic isolation structure system. Compared with the prior art, the method has the advantages that the calculation result with higher precision can be obtained more conveniently and quickly, the calculation amount is reduced and the like.

Description

technical field [0001] The invention relates to the field of parameter optimization of a base-shock-isolation structure system, in particular to a method for optimizing a base-shock-isolation structure system based on reliability analysis. Background technique [0002] Due to the uncertainty of the initial conditions of the structure, basic parameters (such as physical parameters, mechanical parameters and geometric parameters, etc.), and the strong randomness of engineering excitations (such as earthquakes, wind and waves, etc.) in terms of time, space or intensity, etc. , the traditional structural vibration control design may have serious safety problems. For example, in the 2011 Great East Japan Earthquake, the administrative building of the Tokyo Technological University installed with viscous dampers was damaged, and in the 1999 Turkish earthquake, a part of the rubber bearing vibration isolation pad of a viaduct was damaged. Therefore, how to ensure the safety and re...

Claims

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Application Information

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IPC IPC(8): G06F30/13G06F30/23G06F119/02G06F119/14
CPCG06F30/13G06F30/23G06F2119/02G06F2119/14
Inventor 彭勇波马阳颖罗程睿
Owner TONGJI UNIV
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