供水管线震害预测方法
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摘要
本文按波动理论对地震作用下供水管线反应的计算方法进行了分析,探讨了地下管道变形传递系数的两种计算方法,即基于海城、唐山地震震害经验的计算公式和基于地基反力系数的计算公式。文中论证了采用考虑管土间相对位移的双线型模型的合理性。在基于可靠度理论的供水管线震害预测方法中,对地面位移和管道不同破坏状态指标的概率统计特征进行了分析,指出了地面位移反应的概率分布为极值Ⅰ型、管道不同破坏状态的指标为对数正态分布较为符合实际。
An analysis method of seismic performance of water supply pipelines is proposed on the base of earthquake wave propagtion in this paperTwo approaches of calculation for the deformation transmission coefficient of the buried pipelines are discussedThe first one is based on the earthquake damage experiences obtained from Haicheng and Tangshan Earthquakes,and the second on the calculation formula of the ground reaction factorThe reasons of acceptance of the bilinear model,which takes account of relative drift between pipe and subsoil,are illustratedIn aspect of earthquake damage prediction of water supply pipelines, the statistic characteristics of the ground displacement and the pipeline damage index are analyzed based on reliability theoryIt is pointed out from the analysis that the probabilistic distribution of ground displacement complies with extreme value I type,but the damage indexes corresponding to various damage states of pipe lines are more approaching lognormal distribution
引文
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