Oblique incidence fluctuation analysis method for seismic waves of horizontal layered site

An analysis method and technology of oblique incidence, applied in seismic signal processing and other directions, can solve the problems of not considering the nonlinear characteristics of soil dynamics, nonlinearity, and insufficient consideration of hysteretic damping, etc., and achieve the effect of high precision and high calculation efficiency

Active Publication Date: 2018-09-18
JIANGNAN UNIV
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Problems solved by technology

On the other hand, the current free-field time-domain analysis of stratified sites under oblique earthquake incidence regards the soil as a linear elastic body, without considering the dynamic nonlinear characteristics of the soil. , hysteretic damping is insufficiently considered, and the nonlinear and hysteretic damping of the soil have an important influence on the free field response of the layered site

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  • Oblique incidence fluctuation analysis method for seismic waves of horizontal layered site
  • Oblique incidence fluctuation analysis method for seismic waves of horizontal layered site

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Embodiment

[0034] Such as Figure 1-2 As shown, this embodiment discloses a seismic wave oblique incident wave analysis method for layered sites, including the following steps:

[0035] (1) Solve the one-dimensional time-domain free field of the layered site when the earthquake is obliquely incident, consider the nonlinear characteristics of the soil when solving the free field, and regard the soil as a viscoelastic material;

[0036] (2) Perform artificial boundary transformation on the free field, and consider the initial stress of the soil during artificial boundary transformation;

[0037] (3) Determine the equivalent load of the artificial boundary based on the geotechnical dynamic analysis model of the OpenSees computing platform;

[0038] (4) Apply an equivalent load to the artificial boundary, and conduct nonlinear toggling analysis.

[0039] In a preferred embodiment of the present invention, further comprising the step of solving the one-dimensional time-domain free field in ...

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Abstract

The invention discloses an oblique incidence fluctuation analysis method for seismic waves of a horizontal layered site, and the method comprises the following steps: (1), solving a one-dimensional time domain free field of the layered site when the seismic waves are obliquely incident, considering the nonlinear characteristics of a soil body when solving the free field, and considering the soil body as a viscoelastic material; (2), carrying out the artificial boundary transformation of the free field, and considering the initial stress of the soil body during the artificial boundary transformation; (3), determining an equivalent load of the artificial boundary through a geotechnical analysis model based on an OpenSees calculation platform; (4), applying an equivalent load to the artificial boundary, and carrying out the nonlinear fluctuation analysis. The method provided by the invention enables the soil body to be taken as the viscoelastic material, gives consideration to the nonlinearity and hysteretic characteristics of the soil body under the dynamic action, is high in precision, and is high in calculation efficiency.

Description

technical field [0001] The invention relates to a wave analysis method for obliquely incident seismic waves in layered sites. Background technique [0002] When analyzing the near-field fluctuations of the soil structure, the input method of vertical incidence of seismic waves is usually used; the non-uniformity of ground motion caused by oblique incidence of seismic waves on layered sites has great impact on important infrastructure such as long-span bridges, subway stations, and tunnels. greater impact. On the other hand, the current free-field time-domain analysis of stratified sites under oblique earthquake incidence regards the soil as a linear elastic body, without considering the dynamic nonlinear characteristics of the soil. , hysteretic damping are insufficiently considered, and the nonlinearity of the soil and hysteretic damping have an important influence on the free field response of the layered site. Based on this, it is very necessary to consider the impact o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/30
Inventor 周太全赵耀
Owner JIANGNAN UNIV
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