基于塑性极限分析的渡槽结构抗震安全评估

项目名称： 基于塑性极限分析的渡槽结构抗震安全评估

项目编号： No.51209041

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 水利科学与海洋工程学科

项目作者： 段秋华

作者单位： 广西大学

项目金额： 25万元

中文摘要： 我国在城市供水与农业灌溉中有大量渡槽，同时随着水资源空间和时间平衡政策的实施，将会建设更多渡槽。渡槽结构多为高墩空间薄壁壳体结构体系，且很多位于地震烈度为7度及以上的地区，其抗震安全对保障输水生命线工程的正常运行有着十分重要的意义。 本项目将在大量调研资料及振动台模型试验基础上，揭示渡槽结构的主要破坏模式和相应破坏机理，建立考虑流固耦合、隔震支座作用时的渡槽结构极限分析的梁壳模型，获得梁壳构件截面的广义屈服准则，结合塑性极限分析与振型分解理论，提出渡槽结构抗震塑性极限分析的弹性迭代算法，进而构建以渡槽结构抗震极限承载力为评价指标的极限状态方程，确定其抗震极限承载力的限值，系统地建立地震作用下渡槽结构的安全评价理论，为结构的健康诊断和防灾减灾措施提供理论依据和应用方法。

中文关键词： 渡槽结构；抗震极限；塑性分析；弹性迭代算法；安全评估

英文摘要： Large amount aqueducts are used for urban water supply and agricultural irrigation in our country, and more aqueducts will be built following with implementation of the equilibrium policy of water resources at space and time. Many aqueduct structures are space think shell structure systems with high piers, and lie in the area with seismic intensity of 7 degree and more than 7 degree, so it is very important that the aqueduct structure seismic safety impacting on the safety operation of the whole water delivery lifeline engineering. This project will reveals the main failure mode of the aqueduct structures and the corresponding failure mechanism based on a large amount of research materials and vibration table model test; it will establish a beam-shell model considering fluid-solid coupling, bearings role of the aqueduct structures, aquire the section generalized yield criterion of the beam-shell membe; In this project, a elastic iterative algorithm used for the seismic plastic limit analysis of aqueduct structures will proposed, which is combined with plastic ultimate analysis and vibration mode decomposition theory, and then to build a limit state equation of aqueduct structures that based on the evaluation index of seismic limit bearing capacity, determine its limit of seismic ultimate bearing capacity. Thus

英文关键词： aqueduct structures；aseismic ultimate；plastic analysis；elastic iterative algorithm；safety assessment