混凝土梁加固有限元模拟与可靠性分析

Finite Element Simulation and Reliability Analysis of Concrete Beams

为确保建筑结构上混凝土梁加固的安全性与可靠性,了解混凝土梁加固在各个环境下的受力载荷条件,基于安全系统工程的相关理论和有限元法的基本原理,以某混凝土梁加固为例,通过分析混凝土梁失效致因模式,建立以混凝土梁加固失效为顶事件的事故树模型与混凝土梁有限元模型,并进行定性分析和数值计算,从而直观地对钢筋混凝土的结构安全度做出总体性评价,确定导致事故的主要潜在风险项,并对混凝土梁加固的安全性进行可靠性分析。研究结果表明,以某混凝土梁加固的"混凝土梁"失效故障模式的发生概率约为2.13%,建筑物混凝土梁可靠度约为97.87%,可为混凝土梁加固方法的确定与实施提供科学依据。

The failure mode of concrete beams is analyzed based on the theory of security systems engi-neering and finite element method basic principle to ensure the structural concrete beams reinforced secu-rity and reliability,understand concrete beams strengthened in various environmental stress load condi-tions to a reinforced concrete beam.Failure tree model and finite element model of reinforced failure of concrete beams as the top event were established.Qualitative analysis and numerical calculation were done,so as to make the overall evaluation of the structural safety of reinforced concrete directly,and de-termine the main potential risk of accident.Further more,reliable analysis of reinforced concrete beam strengthened security was done.The research results show that the mode failure probability is about 2.13% in concrete beams reinforced concrete beam failure,building concrete beam reliability is about 97.87%.It can provide a scientific basis for the determination and implementation of concrete beam re-inforcement methods.