地震动力响应分析最佳阻尼形式研究

Optimal Damping form Research of Seismic Dynamic Response Analysis

地震波在传播过程中会产生能量消散,在动力计算中可以用材料阻尼矩阵对其表示。基于FLAC3D对某场地进行了地震动力时程分析,阻尼模型分别采用局部阻尼、瑞利阻尼、滞后阻尼,通过人工合成法合成地表地震波。运用EERA频域计算软件反演基岩地震波,边界采用静态和自由场动力边界条件。基岩波从模型基底输入,将FLAC3D时域结果与EERA频域结果进行对比并分析出最佳阻尼形式。计算结果表明,不同阻尼形式设置对地表和层间动力响应影响较大,对比后发现瑞利阻尼结果与频域解误差最小,结果比较合理。阻尼分析结果可为动力计算人员在阻尼选取方面提供参考。

Geotechnical materials dissipate energy as seismic waves propagate through them,This can be expressed as damping matrix in the calculation of dynamic.A certain area dynamic time history analysis based on FLAC3D.With the damping model local damping,Rayleigh damping and hysteretic damping,Create surface wave by the method of artificial.Bedrock wave deconvolution by frequency calculation software EERA,Using the static and dynamic free field boundary conditions.Input bedrock wave from the FLAC3D model base,Comparing the FLAC3D time-domain results with EERA frequency results and analyse the best form of damping.Calculation results show that different damping greatly influence the dynamic response of the surface and strata,The result also shows that the solution of Rayleigh damping minimum error with EERA solution,Damping analysis results can provide a reference for dynamic calculation personnel in selecting damping.