异形斜塔斜拉桥地震响应分析和索塔锚固详细应力分析

发布时间：2019-07-04 19:57

【摘要】：论文以70+80+200+80+70m异形斜塔斜拉桥为研究背景,运用有限元软件MIDAS/CIVIL建立全桥有限元模型。模型充分考虑桩-土之间的相互作用,参照实际情况准确模拟桥梁的下部结构和支座。在全桥模型的基础上,运用影响矩阵法和倒拆分析法分别确定斜拉桥成桥阶段合理索力和施工阶段合理索力,并对合理成桥阶段和施工后成桥阶段进行对比,验证倒拆分析法的可行性。之后,对结构成桥状态的自振特性进行分析,再分别采用反应谱法、线性时程法和非线性时程法分析结构的地震响应,并对反应谱法与线性时程法进行对比分析,检验两种方法的一致性,对线性时程法与非线性时程法进行对比分析,得出减隔震支座对地震动作用下结构受力的影响。最后,运用有限元软件ALGOR建立基于杆单元、板单元和实体单元的全塔组合单元有限元模型,并对钢锚箱区域局部加密,在此基础上对索塔锚固区的各板件进行应力分析,由此校验钢锚箱设计的合理性,并提出相关建议。
[Abstract]:Based on the research background of 70802008070m special-shaped inclined tower cable-stayed bridge, the finite element model of the whole bridge is established by using the finite element software MIDAS/CIVIL. The model fully considers the pile-soil interaction and accurately simulates the lower structure and support of the bridge according to the actual situation. On the basis of the whole bridge model, the influence matrix method and the reverse disassembly analysis method are used to determine the reasonable cable force in the bridge completion stage and the reasonable cable force in the construction stage, respectively, and the reasonable bridge completion stage and the bridge completion stage after construction are compared to verify the feasibility of the reverse demolition analysis method. After that, the natural vibration characteristics of the bridge state are analyzed, and then the seismic response of the structure is analyzed by response spectrum method, linear time equation method and nonlinear time equation method respectively, and the response spectrum method and linear time equation method are compared and analyzed to test the consistency of the two methods. The linear time equation method and nonlinear time equation method are compared and analyzed, and the influence of isolation bearing on the force of the structure under ground motion is obtained. Finally, the finite element model of the whole tower combination element based on rod element, plate element and solid element is established by using the finite element software ALGOR, and the local encryption of the steel anchor box area is carried out. on this basis, the stress analysis of each plate in the cable tower anchoring area is carried out, and the rationality of the steel anchor box design is verified, and some relevant suggestions are put forward.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55;U448.27

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