大跨度混合式结合梁斜拉桥地震响应与减震研究

发布时间：2019-03-20 09:52

【摘要】：地震发生时，会使道路桥梁中断，给交通带来严重破坏。这也使得震后的救援工作困难重重，导致更加严重的生命和经济损失。大跨度混合梁斜拉桥是一种性能优良、运用广泛的桥型，对该种类型的斜拉桥进行抗震研究对桥梁设计和建设具有重要的指导意义。洋浦大桥是一座主跨为460m的混合梁斜拉桥，其地质条件不理想，位于近海海域。本文以此为工程背景开展了如下的研究内容：（1）研究了混合梁斜拉桥的发展历程和国内外混合梁斜拉桥减震设计现状。以大跨度混合梁斜拉桥－洋浦大桥为工程背景，，采用大型有限元分析软件MIDAS/CIVIL2010分别建立了有桩土和无桩土两种全桥空间模型，并对其分别进自振特性分析，研究两种模型自振特性的差异。（2）讨论现有地震动力分析方法的优缺点，分别对有桩土和无桩土采用反应谱分析和时程分析。比较两种模型在地震荷载作用下的动力响应，并将反应谱分析结果和时程分析结构做了对比。（3）采用粘滞阻尼器进行减震设计，研究粘滞阻尼器对混合梁斜拉桥地震动力响应的影响。并对阻尼器的参数进行优化，选择一组最佳参数组合。采用两种阻尼器布置方案：主塔处布置阻尼器、辅助墩和主塔均布置阻尼器，对比减震效果。上述研究表明，选取合适的阻尼器参数，在主塔和辅助墩处对称布置阻尼器能很好的控制主桥在地震作用下的纵向位移，并且主桥的内力响应同时减小。此方案提高了斜拉桥的抗震能力和耐久性，符合减震设计的思想。可供其他类型桥梁的抗震分析及减震设计参考。
[Abstract]:When an earthquake occurs, the road and bridge will be interrupted and the traffic will be seriously damaged. This also makes relief efforts after the earthquake difficult, resulting in more serious loss of life and economic losses. The long-span hybrid beam cable-stayed bridge is a kind of bridge with excellent performance and widely used. The seismic research on this type of cable-stayed bridge is of great significance for the design and construction of the bridge. Yangpu Bridge is a mixed-beam cable-stayed bridge with main span of 460 m. Its geological conditions are not ideal and it is located in offshore waters. The main contents of this paper are as follows: (1) the development history of hybrid beam cable-stayed bridge and the present situation of seismic damping design of hybrid beam cable-stayed bridge at home and abroad are studied. Taking the long-span mixed-beam cable-stayed bridge-Yangpu Bridge as the engineering background, the spatial models of pile-soil bridge and non-pile-soil bridge are established by using the large-scale finite element analysis software MIDAS/CIVIL2010, and the natural vibration characteristics of each bridge are analyzed. The difference of natural vibration characteristics between the two models is studied. (2) the advantages and disadvantages of the existing seismic dynamic analysis methods are discussed, and the response spectrum analysis and time history analysis are applied to the pile-soil and the non-pile-soil respectively. The dynamic responses of the two models under earthquake loads are compared, and the results of response spectrum analysis are compared with those of time history analysis structures. (3) the influence of viscous damper on seismic response of hybrid beam cable-stayed bridge is studied by using viscous damper. The parameters of the damper are optimized and a set of optimal parameters are selected. Two kinds of damper arrangement schemes are adopted: the main tower is equipped with dampers, the auxiliary piers and the main towers are arranged with dampers, and the damping effects are compared. The results show that the longitudinal displacement of the main bridge under earthquake can be well controlled and the internal force response of the main bridge can be reduced at the same time by selecting the appropriate damper parameters and arranging the dampers symmetrically at the main tower and the auxiliary pier. This scheme improves the seismic capacity and durability of cable-stayed bridges, and accords with the idea of damping design. It can be used as a reference for seismic analysis and damping design of other types of bridges.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55;U448.27

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