【作者】 陈立宏； 柴小兵； 李旭； 秦晓鹏；

【Author】 CHEN Li-hong;CHAI Xiao-bing;LI Xu;QIN Xiao-peng;School of Civil Engineering,Beijing Jiaotong University;Henan Textile &Architectural & Designing Institute Co.,Ltd;

【机构】 北京交通大学土木建筑工程学院； 河南省纺织建筑设计院有限公司；

【摘要】 复杂岩土体的变形可靠度分析往往涉及大量有限元计算,庞大的计算量制约了可靠度理论在岩土工程中的应用。常规一次二阶矩法(FOSM)虽然简单易用,但是对于非线性程度较高的岩土问题,其精度并不令人满意。本文提出了一种将改进一次二阶矩法(ROSM)与有限元程序相结合的复杂结构可靠指标求解方法。该方法无需人为构造极限状态方程,每次迭代n+1个样本点,经过数次迭代就可以求解出结构的可靠性指标(n为随机变量的个数)。此方法具有收敛速度快、计算量小、计算过程简洁以及程序实现简单等优点。实例验证表明该方法具有较高的计算精度,单次计算量仅为响应面法的一半。采用本文所提的方法成功的对一座300m高的混凝土面板堆石坝进行沉降变形的可靠性分析,为岩土工程复杂结构可靠性分析提供了一种新的思路。更多还原

【Abstract】 Reliability analysis of displacement of complex geotechnical engineering often involves a large amount of calculation of finite element,which restricts the application of reliability analysis in the geotechnical engineering.FOSM method is widely used to solve the reliability analysis,but the results of nonlinear problems calculated regular FOSM method may not accurate enough.A Modified ROSM method was employed with the finite element method to compute the reliability index of the displacement of structure or geotechnical engineering.The modified ROSM method can obtain the reliability index within several iterations and have higher accuracy.Comparing with response surface method and FOSM method,modified SORM method is more efficient and the process of calculation is simple.The results of several examples proved it.This method is used to analysis the reliability of a Concrete Faced Rockfill Dam which is 300 meters high successfully.This method provides a new way to analyze the reliability of complex geotechnical engineering.更多还原