结构关键参数对三塔悬索桥动力特性的影响

发布时间：2018-08-31 11:07

【摘要】：以世界第一大跨度三塔悬索桥——泰州长江公路大桥为研究对象,基于ANSYS建立了该桥的三维有限元模型,并采用子空间迭代法对其进行了模态分析,得到了该桥的相关动力特性参数并对其进行了分析。在此基础上根据该桥的结构型式和受力特点,重点研究了矢跨比、中塔刚度、中塔形式以及土-桩-结构作用等关键参数对结构动力特性的影响,深入分析了该桥动力特性随上述结构关键参数的变化趋势。结果表明,增大主缆矢跨比、提高中塔纵向刚度有利于改善大桥的颤振性能。所得结论可为大跨度三塔悬索桥的动力设计和研究工作提供参考。
[Abstract]:Taking Taizhou Yangtze River Highway Bridge, the world's largest span three-tower suspension bridge, as the research object, the three-dimensional finite element model of the bridge is established based on ANSYS, and the modal analysis is carried out by subspace iterative method. The dynamic parameters of the bridge are obtained and analyzed. On this basis, according to the structural type and stress characteristics of the bridge, the influence of the key parameters, such as the rise-span ratio, the stiffness of the middle tower, the form of the middle tower and the soil-pile-structure action, on the dynamic characteristics of the structure is studied. The dynamic characteristics of the bridge with the key structural parameters are analyzed. The results show that the flutter performance of the bridge can be improved by increasing the rise-span ratio of the main cable and increasing the longitudinal stiffness of the middle tower. The conclusions can be used as reference for dynamic design and research of long span three-tower suspension bridge.
【作者单位】：东南大学混凝土及预应力混凝土结构教育部重点实验室;
【基金】：国家自然科学基金资助项目(51378111,51278104) 教育部“新世纪优秀人才支持计划”资助项目(NCET-13-0128) 江苏省交通科学研究计划资助项目(2011Y03) 亚热带建筑科学国家重点实验室开放研究基金重点资助项目(2014KA04) 中央高校基本科研业务费优秀青年教师专项资金资助项目(2242012R30002)
【分类号】：U441.3;U448.25

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