地震工程学报2016，Vol.38Issue(6)：909-915,7.DOI:10.3969/j.issn.1000-0844.2016.06.0909
瑞利阻尼对砂土场地非线性地震响应的影响分析
Influence of Rayleigh Damping on Nonlinear Seismic Responses of Sand Sites
摘要
Abstract
Under seismic loads,some phenomena will occur in free field,including lateral deformation of soil and ground response amplification.When evaluating the seismic response of free field,it is the highly nonlinear characteristics of soil that significantly influences the results obtained when utilizing differing damping ratio and shear modulus values and is one of the reasons that experimental results and calculated results can largely differ.Currently,the Rayleigh damping method is most commonly used for site seismic dynamic response analysis.Based on a simplified version of this method,this study analyzes the influence of different values of soil damping ratio and control frequency on calculated results.Using the finite element platform OpenSees,we have adopted the PDMY constitutive model fitted for soil dynamic analysis and established a one-dimensional shear beam model to simulate the three-dimensional free field. Compared with centrifuge model test results,this study analyzed the effects of the Rayleigh damping on the site response and lateral deformation of free field.In the case of Nevada dry sand (relative density 60%),there is good agreement between the calculated results and the test results when the damping ratio and control frequency ratio are set as 4% and 5%,respectively.Our comprehensive analysis suggests that special attention should be paid to value selection of Rayleigh damping in the time domain calculations of site nonlinear response.关键词
地震响应/侧向变形/阻尼比/瑞利阻尼系数/离心机试验/OpenSeesKey words
seismic response/lateral deformation/damping ratio/Rayleigh damping coefficient/centrifuge test/OpenSees分类
建筑与水利引用本文复制引用
王豪,高广运,杨成斌..瑞利阻尼对砂土场地非线性地震响应的影响分析[J].地震工程学报,2016,38(6):909-915,7.基金项目
国家自然科学基金项目(41372271) （41372271）
