Method for evaluating anti-seismic property of building

Abstract

The invention relates to a method for evaluating the anti-seismic property of a building. The method comprises the following steps: (1) establishing a random seismic motion input model meeting the requirement according to the site condition, generating seismic waves under the seismic category setting condition, and selecting three actually recorded seismic waves and a manually simulated seismic wave to be inputted; (2) performing the seismic response analysis of a deterministic structure through a finite element model, and obtaining the displacement response among structure layers and the axial force response of an isolation bearing in the X direction and the Y direction under the seismic motion input action by using a probability density evolution equation when the seismic category of the structure is set; (3) on the basis of the random seismic response analysis of a seismic isolation structure, calculating the extreme values of response indexes, finally, giving out the degree of reliability of related indexes, and evaluating whether the degree of reliability meets the anti-seismic requirement or not. The seismic response condition of a multiple-degree-of-freedom system can be objectively and comprehensively evaluated on the basis of a probability density evolution method, and the anti-seismic property of the building is reliably and accurately evaluated.

Description

technical field [0001] The invention relates to the field of building anti-seismic safety, in particular to a method for evaluating the anti-seismic performance of buildings. Background technique [0002] Under the action of natural disasters such as strong winds, earthquakes and waves, the safety of structures has become an issue of increasing concern. Traditional methods such as increasing structural rigidity, bearing capacity or material strength have been difficult to meet people's increasingly high requirements. Therefore, as a new way to improve the safety, applicability and comfort of structures, the theory and engineering application methods of structural disaster resistance control have been widely studied and applied. [0003] Structural shock absorption or vibration control methods can be roughly divided into three aspects: foundation isolation, passive energy dissipation and active control. Compared with passive energy dissipation and active control, foundation ...

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Problems solved by technology

Relying on deterministic dynamic response analysis, it is still difficult to fully obtain the comprehensive and accurate seismic behavior of isolation structures. Therefore, in recent years, stochastic response analysis and seismic reliability evaluation methods have attracted more and more attention in the field of foundation isolation

[0004] Classical structural dynamic reliability analysis mainly includes three types of analysis methods, among which the theoretical method of crossing process is more commonly used in engineering practice. However, due to the difficulty of knowing the joint probability distribution required in the calculation of expected crossing It is artificially assumed that the accuracy of this method is difficult to be guaranteed; the reliability analysis method with a relatively strict theoretical basis is the diffusion process theory method, but it cannot be applied to the analysis of multi-degree-of-freedom systems; although the method based on stochastic simulation has in principle Wide applicability, however, the workload of direct stochastic simulation calculation is too large, although some progress has been made in stochastic simulation improvement techniques such as variance reduction and importance sampling technology, but its applicability needs further research

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