非线性分层地基地面运动反演分析  

Inverse Calculational Analysis of Ground Motion in Non-Linear Layered Soil

作　　者：蔡袁强[1] 凌道盛[1] 周迪永 钱磊[1] 

机构地区：[1]浙江大学岩土工程研究所,杭州310027

出　　处：《振动工程学报》2000年第3期426-432,共7页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目! (编号 :5 990 80 12

摘　　要：采用非线性土层平稳随机地震反应分析的等价线性化方法 ,运用半无限长剪切梁上剪切型多质点系地震反应分析的 Fourier变换分析方法 ,结合自由场地地表处测得的地震加速度记录反演分析了非线性成层地基基岩的地震运动 ,并编制了相应的分析程序。用随机地震概率描述方法来求解考虑土层非线性特性所需的等效参数 ,在地基及土石坝等大型上部结构的抗震设计计算中向动力可靠设计方向发展 ,避免了在采用等价线性化法进行近似计算时 ,引入限制条件过多 ,分析繁杂 ,难以实现应用的缺点。根据杭州某自由场地实际地质情况反演分析了该场地基岩的地震运动 。A method for calculating the equivalent modulus and damping ratio with random earthquake analysis in non-linear soil ahs been proposed. With Fourier transform method for earthquake response analysis of shear-type multi-mass system on a semi-infinite shear beam and the record of earthquake acceleration obtained from free ground surface, the motion of basement rock inversely in non-linear layered soils can be calculated. A corresponding program is also given. The aseismatic design for large superstructures such as foundation and dam are developed to a dynamic-reliability way by using probability method presented in this paper, which overcomes the shortcomings in equivalent linearization method. These shortcomings include complicated calculations, too many limited conditions and difficulty in practical applications. The basement rock motion of a certain ground in Hangzhou is examined in the fourth part of this paper. Numerical analysis indicates that the inverse calculation with probability method is necessary and accurate.

关 键 词：非线性分层地基 地面运动 反演分析 地震反应 

分 类 号：P315.9[天文地球—地震学]