某隔震连续梁桥的地震失效模式研究

发布时间：2018-05-07 21:12

本文选题：桥梁隔震 + 损伤模型　；参考：《四川大学学报(工程科学版)》2016年05期

【摘要】：针对传统可靠度分析对隔震桥梁地震失效模式识别的局限性,提出一种基于IDA分析和加权秩和比法的失效模式判别方法,结合改进的Park-Ang损伤模型,给出具有统计意义的隔震桥梁的地震损伤失效模式,为隔震桥梁优化设计提供依据。以某6跨隔震连续梁桥为例,基于opensees建立桥梁结构有限元模型,分析得到基于加权秩和比的失效模式,并与结构的最弱失效模式进行对比。针对最弱失效模式,分析隔震支座屈重比对结构时程响应的影响,得出该隔震桥梁的最优屈重比。结果表明:基于加权秩和比法的失效模式为中间墩支座最先失效,且所有隔震支座先于桥墩失效,与最弱失效模式的规律一致,该隔震桥梁的最优屈重比为7%,优化后桥梁的失效PGA增大了0.05g。
[Abstract]:In view of the limitation of traditional reliability analysis to seismic failure pattern identification of isolated bridges, a new method based on IDA analysis and weighted rank sum ratio method is proposed to distinguish the failure modes, which is combined with the improved Park-Ang damage model. The failure mode of seismic damage of isolated bridges with statistical significance is given, which provides the basis for optimum design of isolated bridges. Taking a 6-span isolated continuous beam bridge as an example, the finite element model of bridge structure is established based on opensees, and the failure mode based on weighted rank sum ratio is obtained and compared with the weakest failure mode of the structure. In view of the weakest failure mode, the influence of the ratio of bearing flexure to weight on the time-history response of the isolated bridge is analyzed, and the optimum ratio of buckling to weight of the isolated bridge is obtained. The results show that the failure mode based on the weighted rank sum ratio method is the first failure of the middle pier bearing, and all the isolated supports fail before the bridge pier, which is consistent with the weakest failure mode. The optimum ratio of buckling to weight of the isolated bridge is 7, and the failure PGA of the optimized bridge increases by 0.05 g.
【作者单位】：武汉大学土木建筑工程学院;广州大学减震控制与结构安全国家重点实验室(培育);宁夏大学土木与水利工程学院;
【基金】：教育部创新团队项目资助(IRT13057) 国家重点基础研究发展计划资助项目(2011CB013606)
【分类号】：U442.55

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