大型工程结构可靠性分析的计算机仿真

Computer Simulation Method of Reliability Analysis for Large Engineering Structure

日本核反应堆安全壳破坏导致的核泄漏事件再次提醒人们混凝土结构的安全性问题是一个十分重要的问题。因此,研究大型工程结构的可靠性评价方法十分必要和迫切。大型工程结构的极限状态函数一般是隐式的,并且具有高度的非线性。对于这类问题,常规的可靠度求解方法失效。针于这类大型工程结构的可靠度求解问题,作者提出结构的响应量利用有限元获取,结构的失效概率由Monte-Carlo随机仿真获得。由此,提出了适于大型工程结构可靠度分析的计算机随机仿真方法。最后,通过对一钢筋混凝土高层框架结构和某一高桥墩的可靠度仿真分析,证明了大型工程结构可靠度分析的计算机随机仿真方法的有效性。

The destruction of safety shell of nuclear reactor in Japan warned people again that security of concrete structure is a most significant problem that should be solved quickly.So,it is very necessary and impendency to study reliability assessment approach of the large engineering structure.In large structural reliability analysis,the limit state function is implicit and high nonlinear.The conventional method to study the reliability of structure is useless for this kind of problem.In order to improve this kind of problem,it was proposed that the response quantities of the structure could be obtained by FEM and the failure probability of the structure could be obtained by Monte-Carlo simulation.Based on the proposal,the new method of stochastic simulation with computer was raised to analyze the reliability of the large scale structure in construction field.And the method was verified by the reliability and parametric sensitivity analysis on a high-rise concrete framed structure and a high-rise concrete bridge pier.