桩-土-结构相互作用与自锚式悬索桥桥塔顺桥向破坏相关性研究

发布时间：2018-05-08 07:18

本文选题：悬索桥桥塔 + 三维地震作用　；参考：《地震工程与工程振动》2015年04期

【摘要】：悬索桥主塔作为核心支撑构件,在地震作用下特别是罕遇地震作用下其结构破坏模式就显得尤其重要,也是保证生命线工程结构震后安全的基础,而目前对大跨度悬索桥破坏模式的研究还很不完善。本文借助Open Sees有限元分析程序,以哈尔滨阳明滩大跨度悬索桥的设计方案为背景,以悬索桥的钢筋混凝土桥塔为研究重点,分析三维罕遇地震作用时,桩-土-结构的动力相互作用对大跨度悬索桥桥塔顺桥向破坏模式的影响。文中以在三维地震作用下塔底截面曲率达到等效屈服曲率,从而桥塔产生具有同时性特征的双塑性铰为破坏基准。分析发现在顺桥向罕遇地震作用下,悬索桥塔结构往往在桩基产生塑性屈服后塔底截面再出现塑性;同时发现考虑桩-土-结构相互作用可以延缓塔底截面进入塑性的时间,但会加大塔底截面的地震反应。
[Abstract]:As the core supporting member of suspension bridge, the structural failure mode of suspension bridge under earthquake, especially under rare earthquake, is especially important, and it is also the basis to ensure the safety of lifeline engineering structure after earthquake. At present, the research on the failure mode of long-span suspension bridge is not perfect. In this paper, with the help of Open Sees finite element analysis program, taking the design scheme of Yangmingtan long-span suspension bridge in Harbin as the background, and taking the reinforced concrete bridge tower of suspension bridge as the research emphasis, this paper analyzes the action of 3D rare earthquake. The influence of the dynamic interaction of pile-soil-structure on the failure mode of long span suspension bridge tower. In this paper, the equivalent yield curvature of the bottom section of the tower under the action of three dimensional earthquake is taken as the basis for the failure of the bridge tower. It is found that the tower structure of suspension bridge often reappears plasticity after plastic yield of pile foundation under the action of rare earthquake along the bridge direction, and it is found that considering pile-soil-structure interaction can delay the time when the column bottom section enters plasticity. But it will increase the seismic response of the bottom section of the tower.
【作者单位】：哈尔滨工业大学土木工程学院;苏州科技学院;
【基金】：国家自然科学基金项目(51278322) 江苏省高校基金重大项目(13KJA560002)
【分类号】：U445.75

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