SH波激励下上覆粘弹性场地土的振动分析  

Vibration Analysis of Overlying Viscoelastic Soil Layer under SH Wave Excitation

作　　者：李刚[1] 段林[1] 熊益农[1] 尚守平[1] 黄均田[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《中南公路工程》2007年第2期91-94,共4页Central South Highway Engineering

摘　　要：采用工程波动理论,考虑简谐SH波诱发的水平振动和场地土的材料阻尼,假定场地土体系处于反平面应变状态,研究半空间上SH波激励下上覆粘弹性场地土的自由场动力反应。利用正交函数法求解基岩运动输入下上覆土层的振动解,以此解来分析SH波激励下粘弹性场地土的放大效应,并将探讨其影响因素。本文结果为进一步研究土—结构物动力相互作用打下坚实的基础,对建筑抗震设计和震害分析具有理论和工程实际意义。By using the wave theories, considering horizontal vibration induced by harmonic SH wave and material damping of soil,besed on the assumption that the ground soil mass is under anti-plane strain states,the free field dynamic response of overlying viscoelastic soil layer under SH wave excitation is mostly presented in this paper. By utilizing method of orthogonal functions, the vibration solution of overlying soil layer under bedrock motion import can be solved. We can analyse the amplification effect of the viscoelastic ground site under SH wave excitation, and discuss the influencing factors. This results establishes consistent foundation for the further studies of soil-structure dynamic interaction, it has theoretical and practical application significance in proceeding the construction seismic designs and earthquake damage analyses.

关 键 词：土—结构动力相互作用 自由场 水平剪切波 放大系数 激励频率 

分 类 号：U416.01[交通运输工程—道路与铁道工程]