钢筋混凝土结构非线性的可靠性评估

摘要

Modern building codes provide a basis for development of advanced nonlinear models for analysis and design of reinforced concrete (RC) structures.Application of nonlinear models permits direct evaluation of reliability of the whole structure at the stage of a structural analysis,In this paper a probabilistic method for reliability evaluation of plane frame structures with respect to ultimate limit states is proposed.The method is based on a combination of the nonlinear finite element structural model and the first-order reliability method (FORM).Implementation of the FORM for nonlinearity of RC structures is considered.Uncertainties associated with the structural model are taken into account and their influence on structural reliability is examined via sensitivity analysis.%以钢筋混凝土平面框架结构的非线性分析为基础,提出了可靠性评估的概率方法;同时考虑了结构模型的不确定性和材料强度相关性对结构可靠性指数的影响,利用有限元二维分层梁单元准确判定结构力学行为的优点,建立结构模型,该模型能体现混凝土和钢筋的不确定性.最后通过一个工程算例验证了本文提出的方法在结构可靠性评估方面的可行性.