结构失效模式识别中失效元漂移问题的分析

基于有限元重分析技术,考虑载荷对结构的综合影响,从失效元漂移问题和结构极限承载能力角度出发,对结构可靠性分析中,增量载荷法的加载方式进行了分析和改进,并通过有限元程序进行了对比验证,文后提供了算例。结果表明,改进后的分析方法具有更广泛的应用性,其分析结果具有满意的精确度和良好的稳定性,更适合于实际工程中大型结构系统在多种载荷共同作用下的可靠性失效模式分析。

Analysis of failure element drift in structural failure mode identification

Considering the synthetic influence of various kinds of loads upon the structures, and from the viewpoints of failure element shift and limit loaded capability, an improvement for the loading form in the original incremental loading method applied in structural reliability analysis has been proposed with the finite element reanalysis technique. In addition, a comparative verification has been made from several numerical examples. The results obtained indicate that the improved incremental loading method has satisfactory accuracy and stability, which can be applied to the reliability analysis of failure modes in the practcal large scale engineering structure system under various kinds of loads.