罕遇地震下渡槽槽架结构弹塑性侧移的可靠度分析

基于变形破坏准则和规范推荐的弹塑性层间位移的简化计算方法,以层间位移为控制指标,提出了渡槽结构"大震不倒"的可靠度分析模型;基于现行相关规范的规定,提出了渡槽槽架结构层间位移的控制限值;根据各随机变量的统计特征,采用Monte-Carlo模拟与有限元相结合的方法对渡槽槽架结构弹塑性位移控制的可靠度进行了研究,结合实例,分析了层间位移可靠指标与层屈服强度系数ξy之间的关系,并为渡槽结构在地震作用下的可靠度分析和设计提供了一种新方法.

Reliability analysis of elastoplastic displacements of aqueduct structure under infrequent earthquake

Based on the criterion of deformation and failure and the simplified method for elastoplastic inter-storey displacement recommended in specification,inter-storey displacements were treated as controlling indices,the reliability analysis model in terms of no collapse under infrequent earthquake was built up.According to the basic specifications in present relevant criterion,the limit value of inter-storey displacement was put forward.According to the statistical characteristics of stochastic variables,the reliabilities controlled by displacement of aqueduct structure under infrequent earthquake have been studied using the method combined Monte-Carlo simulation with finite element.The relationship between the reliabilities of inter-storey displacement and the factor of inter-storey yield strengthξywere analyzed combined with a practical case.A new reliability method and design of aqueduct structure under earthquake action is brought out.