土层地震反应分析中不同阻尼取值的影响比较  

Comparative Study on Influence of Different Damping Values in Soil-layer Seismic Response Analysis

作　　者：马俊玲[1] 丁海平[1,2] 

机构地区：[1]苏州科技学院江苏省结构工程重点实验室,江苏苏州215011 [2]中国地震局工程力学研究所,哈尔滨150080

出　　处：《防灾减灾工程学报》2013年第5期517-523,547,共8页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51278323)资助

摘　　要：由于时域、频域分析中阻尼的选取方法不同,其计算结果有时会有很大的差别。通过对不同厚度的单一均匀土层和多层土层在不同地震动作用下的反应分析,比较了目前常用的不同Rayleigh阻尼系数的时域结果和频域等效线性化结果,指出影响阻尼系数的不同目标频率的选取是时域计算结果异同的主要原因,探讨了由频域分析中的滞回阻尼比确定时域分析中的Rayleigh阻尼系数的方法,从而为利用滞回阻尼在时域分析中进行土层地震反应分析提供了依据。为了减少时域与频域计算结果的误差,最好采用完整的Rayleigh阻尼公式,且目标频率选取土层的第1和第3阶自振频率。Because methods of damping selection are different, therefore there will be a great difference in the results of time domain analysis and frequency domain analysis. In this paper, the results of time domain analysis and frequency domain equivalent linear analysis were compared for single layer homogeneous soils with different thicknesses and multi-layered soil under different ground motions, and the results show that the selection of different target frequencies influencing viscous damping coefficient is the main reason leading to different results in time domain analy- sis. How to evaluate the Rayleigh damping coefficient in time domain analysis from the hysteretic damping ratio in frequency domain analysis was also discussed so that hysteretic damping can be used more reasonably in time domain site response analysis. In order to reduce the differences of the results of time domain analysis and frequency domain analysis, we had better use complete Rayleigh damping formulation and the first and the third natural frequencies.

关 键 词：滞回阻尼 等效线性化 Rayleigh阻尼 目标频率 土层地震反应 

分 类 号：P315[天文地球—地震学]