横撑对钢管混凝土拱桥横向稳定及横向地震响应的影响研究

发布时间：2018-12-16 23:36

【摘要】：近些年来,因为较大的跨越能力、美观的外形、方便的施工等优势,我国对钢管混凝土拱桥进行了大量的推广应用。这促使大量桥梁工作者对钢管混凝土拱桥静力和动力方面从事了很多的相关研究,其中稳定性和地震响应分析尤为被大家所重视。而横撑作为整个结构中的一部分,它对稳定性及地震响应产生的影响有其一定的研究价值。本文针对钢管混凝土拱桥的发展情况,稳定性、地震响应及横撑的相关研究状况进行了简单介绍。对拱结构稳定性分类、分析方法和拱面内外屈曲基本解析方程做了简单叙述。接着结合实际工程,借助有限元软件模拟实桥状态,就横撑的设置位置、横撑的数目以及其形式对横向稳定的影响,采用线弹性稳定分析法进行研究;于线弹性范围内,针对横撑设置位置、数目以及其形式对横向地震响应的影响,借助动态时程法进行探讨。通过计算可知,该钢管混凝土拱桥结构的竖向刚度明显大于结构的横向刚度,在其实际横撑布置方式下,稳定性满足规范要求。针对该结构横向稳定来说,横撑设置位置、横撑数目均能够有效增强其结构的横向刚度,进而提升其横向稳定;此外,“X”字撑、“K”字撑及“米”字撑对横向稳定贡献程度相近。针对其结构横向地震响应来说,以拱顶横向位移为参照,横撑设置位置、横撑的数目有效影响着其结构的横向地震响应;就其对结构横向地震响应减弱效果来说,“X”字撑、“K”字撑及“米”字撑对横向地震响应贡献程度相近。在对横撑形式的选择使用上,在同时考虑横向稳定及横向地震响应时,并且兼顾经济效益,不考虑其余因素的影响下,应当优先选用“K”字撑和“X”字撑。
[Abstract]:In recent years, due to the advantages of large span ability, beautiful shape and convenient construction, the concrete-filled steel tubular arch bridge has been widely used in our country. This has prompted a large number of bridge workers to do a lot of research on static and dynamic aspects of concrete-filled steel tubular arch bridge, among which stability and seismic response analysis have been paid more attention to. As a part of the whole structure, the transverse brace has a certain value to study the influence of the stability and seismic response. This paper briefly introduces the development, stability, seismic response and lateral bracing of concrete-filled steel tubular arch bridge. The stability classification of arch structure, the analysis method and the basic analytical equation of buckling inside and outside the arch plane are briefly described. Then combining with the actual project and using finite element software to simulate the state of the real bridge, the location of the transverse brace, the number of the transverse brace and the influence of its form on the lateral stability are studied by the method of linear elastic stability analysis. In the range of linear elasticity, the influence of position, number and form of transverse brace on lateral seismic response is discussed by means of dynamic time-log method. The results show that the vertical stiffness of the concrete filled steel tubular arch bridge is obviously larger than the transverse stiffness of the structure and the stability meets the requirements of the code under the actual arrangement of transverse braces. For the lateral stability of the structure, the location and the number of transverse braces can effectively enhance the transverse stiffness of the structure, and then enhance its lateral stability. In addition, X, K and M support contribute to lateral stability to the same extent. For the lateral seismic response of its structure, the transverse displacement of the arch roof is taken as the reference, and the position of the transverse brace is set, and the number of the transverse brace affects the lateral seismic response of the structure effectively. As far as the weakening effect of lateral seismic response is concerned, the contribution of "X" bracing, "K" bracing and "rice" bracing to lateral seismic response is similar. In the selection and use of transverse braces, when lateral stability and lateral seismic response are considered at the same time, and economic benefits are taken into account, "K" bracing and "X" bracing should be preferred when other factors are not considered.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55;U448.22

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