论文部分内容阅读
非岩性场地地震反应分析中,瑞利阻尼系数在很大程度上影响其计算的精度。基于等效线性法考虑土体的非线性动力特征,采用5种不同确定阻尼系数的方法,对非岩性自由场地进行时域动力分析,并与频域程序SHAKE 91计算结果进行比较。结果表明:邹德高等提出的改进后的方法能较好地反映场地的阻尼特性和地震动的频谱特性,对非岩性场地的阻尼模拟是相对准确的。此自由场地的动力计算工作为下一步整个厂房-地基动力相互作用分析提供了输入依据。
In non-lithological site seismic response analysis, Rayleigh damping coefficient to a large extent affect the accuracy of its calculation. Based on the equivalent linear method, the nonlinear dynamical characteristics of soils are considered. Five different damping coefficients are used to analyze the time-domain dynamics of the non-lithologically free field. The results are compared with those of the SHAKE 91 frequency domain program. The results show that the improved method proposed by Zou et al. Can better reflect the damping characteristics of the site and the spectrum characteristics of ground motion, and is relatively accurate for damped simulation of non-lithological sites. The dynamic calculation of this free site provides the basis for the next step of the entire plant-foundation dynamic interaction analysis.