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提出了考虑时间、空间变异特性的退化钢筋混凝土桥梁耐久性概率评估的随机有限元方法. 首先,通过考虑钢筋与混凝土之间时变的粘结滑移关系及腐蚀钢筋的应力应变关系,采用弥散裂纹方法对退化钢筋混凝土桥梁进行有限元分析.然后,提出了退化钢筋混凝土桥梁耐久性概率评估的随机有限元分析方法,基于文献及现场调查的数据,采用蒙特卡罗仿真方法对钢筋均匀及点锈蚀、混凝土保护层厚度、表面氯离子含量、氯离子扩散系数及腐蚀率等进行随机抽样,考虑这些时变及空间变异的因素对钢筋混凝土桥梁可靠度的影响.最后,以天津滨海新区的一座钢筋混凝土梁桥为例分析了所提方法的应用.
A stochastic finite element method for evaluating the durability of degenerated RC bridges considering time and space variability is proposed.Firstly, by considering the time-dependent bond-slip relationship between rebar and concrete and the stress-strain relationship of corrosion rebar, Crack method is used to carry out finite element analysis of the degenerated RC bridge.After that, a stochastic FEA method is proposed to evaluate the durability of the degenerated RC bridge. Based on the data from the literature and field survey, the Monte- Corrosion, thickness of concrete cover, surface chloride ion content, chloride ion diffusion coefficient and corrosion rate were randomly sampled to consider the influence of these time-varying and spatial variation factors on the reliability of the reinforced concrete bridge.Finally, taking Tianjin Binhai New Area as a Reinforced concrete beam bridge as an example to analyze the application of the proposed method.