结构可靠性评判中构件权系数的计算研究

Study on Component Weighting Factors in Structural Reliability Evaluation

以结构可靠性理论为基础 ,考虑了荷载效应间和主要失效模式间的相关性对结构体系可靠性的影响 ,通过计算各构件抗力同等程度的下降所引起的结构体系可靠性不同程度的降低 ,来衡量各构件在整个结构体系中的相对重要性 ,并通过比较这种相对重要性来确定构件权系数 ,从而建立起一种新的构件权系数计算模型 ,最后利用算例说明了该方法的应用 .分析结果表明 ,建议的方法能够准确体现构件权系数的含义 ,反映出构件对整个结构体系的影响程度 ,与传统的层次分析法计算结果相比较 ,克服了其主观性的缺点 。

Based on the reliability theory, considering the influence of the correlation of load effects and major failures modes on the structural reliability, the relative importance of structural components is given through computing the decrease of structure system relability caused by the component resistance decrease. After analyzing the relative importance, a computational model of components weighting factors is determined. A practical example is given for the purpose of illustrating the strategy. The result shows that this method reflects the true physical meaning of the structure component weight factors and the influential degree of components on the whole structures. Comparing the result with traditional AHP method, this new model overcomes the shortcoming of subjective and provides a new idea on the research of component weighting factors.