应用有限元响应面法分析地下结构可靠度

Reliability Analysis of Underground Structure by FEM Response Surface Method

鉴于隧道与地下结构所具有的特殊性和重要性,对其开展可靠性研究是一项非常有意义的工作。在对地下结构等大型复杂非线性结构进行可靠性分析中,荷载效应统计特征分析是一个比较复杂的问题。考虑围岩和衬砌的相互作用,采用弹塑性有限元响应面法分析隧道衬砌结构荷载效应的统计特征,推导了变量相关条件下计算结构可靠指标的分位值法迭代计算公式,对隧道衬砌结构可靠度进行了分析。

Considering the specialty and importance of underground structure, it is a very meaningful work to study the reliability of tunnel lining structure. The statistic analysis of loading effect on lining structure is a key problem for the reliability analysis of complex nonlinear underground structure. Considering the mutual effect of the surrounding rock and the lining structure, the statistic properties about the loading effect of the tunnel lining structure are analyzed with the elasticplastic FEM response surface method, the direct iteration calculation equation of reliability index under the condition of nonlinear function correlated to the variable has been deduced, and the reliability of tunnel lining structure has been analyzed.