码头成层地基中地震动的非线性反演方法  

Nonlinear inversion method of ground motion in layered soil of a quay

作　　者：胡少伟[1] 牛志国[1] 陆俊[1] 

机构地区：[1]南京水利科学研究院水利部水科学与水工程重点实验室,江苏南京210029

出　　处：《水运工程》2010年第4期7-10,共4页Port & Waterway Engineering

基　　金：水利部前期项目<大坝地震灾变机理与对策研究>(S40901)

摘　　要：为了合理地对某码头结构进行抗震分析,采用非线性土层随机地震反应分析方法,结合自由场地地表处测得的地震加速度记录,反演得到了基岩加速度,为结构抗震分析提供了合理的地震动输入。由于土体是一种显著的非线性材料,采用一种简化的方法求解剪切模量和阻尼比,从而确立了土体的动力本构关系,建立了非线性反演方法。最后,结合某高桩码头工程,对该工程地表加速度进行了非线性反演得到基岩地震动。计算结果表明该反演方法是正确的,有着较高的精度。For a reasonable seismic analysis of a quay structure,this paper presents a method that can be used to inverse bedrock ground motion based on the method for calculating the response of nonlinear soil layer with random earthquake analysis,combining with the record of earthquake acceleration obtained from free ground surface,and provide reliable earthquake motion inputs for the seismic analysis.Because the nonlinear properties of soil are very significant,a simplified method is adopted to solve the deformation modulus and damping ratio to establish the dynamic constitutive,and propose a nonlinear inversion method.Finally,combining with an actual project of a high-piled quay,the input ground motion in the bedrock is obtained by the inversion method based on the surface motion,the result of which shows that the method is correct and has a high precision.

关 键 词：非线性反演 基岩地震动 动力本构 成层地基 高桩码头 

分 类 号：TU435[建筑科学—岩土工程]