【作者】 全开华；

【导师】 阎贵平； 赵冠远；

【作者基本信息】 北京交通大学 ， 防灾减灾工程及防护工程， 2008， 硕士

【摘要】 客运专线桥梁结构形式复杂,桥墩截面尺寸比一般的铁路桥梁大很多,这使得桥跨结构的纵横向刚度都比较大,整体造价也提高了很多,由于所述客运专线桥梁的特殊性和重要性,保证客运专线桥梁的抗震安全则显得很重要,同时也要求桥梁抗震设计时采用延性抗震设计。新的铁路工程抗震规范所提出的延性抗震设计采用非线性时程分析方法,这种计算方法复杂、计算成本比较高,不易被一般工程设计人员掌握,而Push-over分析方法作为一种结构非线性反应的简化计算方法,是一种结构抗震能力评价的新方法。这种分析方法通过对结构施加不断增大的侧向荷载直到达到一定的目标,可以知道结构在地震作用下的需求能力,能够得出更多的重要信息,且操作简便。本文以京津城际轨道新开河特大桥为工程背景,研究了两种分析方法在客运专线桥梁抗震分析中的应用,对客运专线桥梁进行抗震评价,并对两种分析方法进行比较,得到了较一致的结果。系统地分析了非线性时程分析方法和Push-over分析方法的基本概念和原理,介绍了非线性时程分析方法的两种直接积分方法,同时介绍了桥梁结构侧向荷载分布模式的选择;讨论了几种常用的Push-over分析方法,详细论述了能力谱方法的应用过程。通过实例进行客运专线桥梁结构的非线性时程分析和Push-over分析,分析桥梁结构的抗震能力,判断了客运专线桥梁在场地地震烈度下的破损极限状态。比较Push-over分析方法与时程分析方法的计算结果,验证了本文所采用的Push-over分析方法在客运专线连续梁桥中应用的合理性及准确性,表明对于客运专线连续梁桥结构可以采用Push-over分析方法进行结构抗震能力评定。图69幅,表12个,参考文献60篇。更多还原

【Abstract】 Passenger dedicated railway bridge structures are very complex, and dimensions of piers are much more larger than other common railway bridges.So their lateral and longitudinal rigidity is more bigger.The whole construction costs are also increared much more.It is very important to guarantee seismic safety of such structures because of the particularity and importance of them. At the same time,the ductile seismic design is needed by passenger dedicated railway bridges in earthquake zones.Nonlinear time history analysis method suggested by seismic code is complex for engineers . Push-over analytical method is regarded as a new seismic evaluation method and also as a simplified one. This method is an efficient tool in performance-based design method which pushes structures with some kind of load patterns until target displacement is reached.This method can evaluate the structural performance under earthquake events. Push-over analysis can get more information than static elastic analysis, and it is easy to operate in most cases. Seismic performance of Xinkaihe River extra major bridge on Beijing-Tianjin intercity rail transit is evaluated using nonlinear time history analysis method and push-over method. The results obtained by two methods are compared in detail.The basic principles and concepts of the push-over analysis method and nonlinear time-history are systemically discussed. Two time-history analysis calculate methods and the distributing patterns of lateral loads are studied, and several push-over methods are compared.The capacity spectrum method is emphasized. Finally, according to the true bridge Xinkaihe River extra major bridge is used to demonstrate the rationality of the push-over analytical method on passenger dedicated railway bridges by comparing with nonlinear time-history analysis method. We also analysis the seismic performance of the passenger dedicated railway bridge.It can be concluded that push-over analytical method is a reasonable method for seismic evaluation of passenger dedicated railway bridges. There are 69 diagrams, 12 tables and 60 references in this paper.更多还原