超大跨斜拉桥顺桥向地震损伤分析与控制

发布时间：2018-05-26 23:14

本文选题：超大跨斜拉桥 + 极端地震　；参考：《建筑科学与工程学报》2014年04期

【摘要】：以一座试设计的主跨1 400m的斜拉桥为例,采用弹塑性方法并引入地震损伤指标分析了不同强度地震作用下飘浮体系和弹性约束体系的地震损伤与破坏模式;研究了极端地震作用下损伤控制策略对斜拉桥损伤控制效果的影响。结果表明:极端地震作用下,主塔和桥墩分别遭受局部失效和严重损伤,发生了典型的弯曲单塑性破坏;基于Park损伤指数的附加耗能阻尼器的损伤控制策略可显著控制主塔、桥墩地震损伤和主梁位移,满足损伤控制目标要求,改善了桥梁的整体抗震性能。
[Abstract]:Taking a cable-stayed bridge with a main span of 1400m as an example, the seismic damage and failure modes of floating system and elastic constrained system under different earthquake intensity are analyzed by using elastic-plastic method and seismic damage index. The effect of damage control strategy on the damage control effect of cable-stayed bridge under extreme earthquake is studied. The results show that the main tower and piers suffer local failure and severe damage respectively under extreme earthquake, and the typical bending failure occurs, and the damage control strategy of the additional energy dissipation damper based on Park damage index can control the main tower significantly. The seismic damage of bridge pier and the displacement of the main beam can meet the requirements of damage control and improve the overall seismic performance of the bridge.
【作者单位】：宁波大学建筑工程与环境学院;同济大学土木工程防灾国家重点实验室;
【基金】：国家自然科学基金项目(91315301) 宁波大学人才工程项目(ZX2014000207)
【分类号】：U442.55;U448.27

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