地基沉降的随机有限元法和可靠度计算  

STOCHASTIC FINITE ELEMENT METHOD AND RELIABILITY ANAL YSIS FOR THE GROUND SETTLEMENT

作　　者：郭志川[1] 刘宁[1] 余登飞 

机构地区：[1]河海大学 [2]上海兴华建筑公司

出　　处：《土木工程学报》2001年第5期62-67,共6页China Civil Engineering Journal

摘　　要：针对邓肯 张本构模型 ,首次推导了基于一阶Taylor展开的地基沉降随机有限元方程及其有关计算公式 ,并对地基沉降对模型中各参数的敏感性逐一进行了分析 ,同时考虑参数随机场的影响 ,对地基沉降进行了随机有限元分析 ,并基于随机有限元对地基点沉降和各点之间的差异沉降的可靠度进行了计算。A stochastic finite element method by using the nonlinear model for the ground settlement is first time proposed in the paper. The stochastic finite element formulation of a ground settlement is carried out based on the first order of Taylor series . The sensitivity of soil parameters with respect to a ground settlement is studied . The influences of random fields of soil parameters in Duncan?Chang Model are taken into account. By the method, not only the mean value but also deviation of the ground settlement can be obtained. The reliability for both the point settlement and the difference settlement between two points is also studied. Some conclusions are got from a numeric example.

关 键 词：地基沉降 随机有限元 随机场 可靠性指标 

分 类 号：TU433[建筑科学—岩土工程]