混凝土折线式基础板地基反力非线性有限元分析

Analysis of Soil Reaction in Concrete Broken Line Baseplate with Nonlinear Finite Element Method

为分析折线式混凝土基础板地基反力,以南昌市某电排站底板为例,综合考虑上部载荷、底板厚度和地基弹模3种因素的耦合作用,运用非线性有限元法对底板地基反力进行分析计算。通过对3种影响底板反力主要因素组合方案的计算结果对比分析得到:板厚与板中部地基反力成反比;上部载荷和地基反力变化规律相同;地基模量对地基反力影响最明显。传统设计中用弹性方法假定按直线分布简化计算地基反力,在大多数情况下会出现较大偏差。文中提出了修正建议。

In order to analyze the soil reaction of concrete broken line baseplate,one pumping station in Nanchang city is taken as an example.The soil reaction of concret broken line baseplate are simulated by the nonlinear FEM considering the coupling influence of upper loads,the thickness of baseplate and the elasiticity modulus of foundation.Through the comparison and analysis of soil reactions with combination projects of three primary factors,it is known that the centre soil reactions indicrease with the thickness of baseplate,the soil reactions change in great with upper loads,and the soil reactions is influenced most greatly by the elasiticity modulus of foundation.In most situations there is a miscount in the calculation of soil reactions with postulated beeline distributing by mechanics of meterial in conventional design,and this paper gives a modified suggestion.