采用不同隔震方案的隔震连续梁桥地震响应分析

发布时间：2018-06-13 01:27

本文选题：隔震桥梁 + 隔震支座　；参考：《天津大学》2014年硕士论文

【摘要】：本文以山东潍坊海惠路二号桥为工程背景,开展了隔震连续梁桥采用不同隔震方案的地震响应分析,直接指导工程设计。主要工作如下:(1)分析了球形钢铰支座、盆式橡胶支座、铅芯橡胶支座和非线性阻尼辐隔震支座(NDQZ)四种隔震支座的构造、工作原理及力学模型,提出了非线性阻尼辐隔震支座的等效线性化分析模型。(2)建立了隔震连续梁桥的全桥有限元模型,采用动力时程分析方法对安装有不同隔震装置的桥梁进行了三维地震响应分析,研究了地震作用下隔震连续梁桥的梁体位移响应、桥墩顶位移响应、墩底剪力响应以及墩底弯矩的变化情况。结果表明:采用隔震装置后,结构自振周期延长,有效避开地震能量集中范围;桥面位移有所放大,墩顶位移减小,墩底剪力和弯矩显著减小。采用隔震支座能够有效降低对桥墩的延性要求,减轻桥梁主体结构的地震作用。(3)考虑到桥梁工程中使用了桩基础,土介质通过桩基对桥梁结构地震响应产生影响,进一步分析了土-结构相互作用(SSI)对桥梁隔震效果的影响。采用规范推荐的M值法考虑土-结构相互作用(SSI),对考虑SSI效应的隔震连续梁桥进行了三维地震响应分析。结果表明:对于自振周期较长的铅芯橡胶隔震体系和非线性阻尼辐隔震体系而言,SSI减小了桥墩的剪力响应,在桥墩设计时应当考虑SSI的有利方面,使设计方案经济合理。
[Abstract]:Based on the engineering background of No. 2 Haihui Road Bridge in Weifang, Shandong Province, the seismic response analysis of the isolated continuous beam bridge with different isolation schemes is carried out to direct the design of the project. The main work is as follows: (1) the structure, working principle and mechanical model of four kinds of isolation bearings, such as spherical steel hinges, basin rubber bearings, lead rubber bearings and nonlinear damping radial isolation bearings, are analyzed. The equivalent linearization analysis model of nonlinear damping radial isolation support is presented. The finite element model of the whole bridge of isolated continuous beam bridge is established. The dynamic time history analysis method is used to analyze the three-dimensional seismic response of the bridge with different isolation devices. The beam displacement response, the pier top displacement response, the pier bottom shear response and the bending moment of the isolated continuous beam bridge subjected to earthquake are studied. The results show that the natural vibration period of the structure is prolonged and the seismic energy concentration range is avoided effectively. The bridge deck displacement is enlarged, the pier top displacement is reduced, and the shear force and bending moment at the bottom of the pier are significantly reduced. Seismic isolation support can effectively reduce the ductility requirements of bridge piers and reduce the seismic action of the main structure of the bridge. Considering the use of pile foundation in bridge engineering, soil media can affect the seismic response of bridge structure through pile foundation. The effect of soil-structure interaction (SSI) on bridge isolation is further analyzed. The seismic response of isolated continuous beam bridge considering SSI effect is analyzed by using M value method which is recommended by the code to consider soil-structure interaction. The results show that SSI reduces the shear response of piers for lead-rubber isolation system and nonlinear damping radiation-isolation system with long natural vibration period. The advantages of SSI should be taken into account in the design of piers so that the design scheme is economical and reasonable.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55

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