【作者】 蒋锋杰；

【导师】 李青宁；

【作者基本信息】 西安建筑科技大学 ， 桥梁与隧道工程， 2011， 硕士

【摘要】 作为城市交通中的重要组成部分,城市高架桥中的曲线桥,在路线、地形等方面基本不受限制,而且线条平顺、建设资金较少,能很好地适应周围的环境,因而受到广泛的应用。近年来,地震给城市带来的破坏越来越严重,而交通的破坏往往加剧了地震次生灾害,极大地延误了救灾时间,给救灾造成了极大的困扰,因此,在现代城市建设中,越来越重视城市曲线桥的抗震问题。然而由于曲线桥的复杂性,对曲线梁桥的地震破坏机理和理论研究还很少,特别是长曲线桥的理论研究还非常少,急待深入探讨。本文讨论分析了城市高架桥的结构体系,讨论了城市高架桥的几种结构形式与构造特点,讨论了上部结构连续箱梁的截面形式,讨论了下部结构中的桥墩和桥台的形式与使用范围,以及支座的布设形式。探讨了地震给城市高架桥带来的震害,例举了多个著名地震的破坏,分析了地震中桥梁破坏的基本特征和经验教训,总结了桥梁的地震破坏形式。本文分析了目前国内外桥梁抗震的研究现状,探讨了地震动输入模式,地震反应分析方法,分析研究了桥梁抗震设计方法的演变与研究现状,讨论了现阶段高墩曲线长桥的一些难点、热点问题,并对这些问题进行了分析,给出了部分研究成果。本文利用大型通用软件ANSYS建立了高墩曲线桥的动力有限元模型,利用时程响应法研究了桥墩墩高对曲线城市桥的稳定性影响,以及不同曲率对曲线桥内力与变形的影响。利用反应谱分析法分析高墩曲线桥结构的动力特性,用时程分析法求解结构地震响应分析,具体包含桥墩墩顶的内力和位移,跨中的内力和位移以及支座反力,总结了曲线桥的动力特性,并比较分析了反应谱法和时程分析法的区别,考虑了行波效应对地震响应的影响,并比较了一致激励和考虑行波效应的差别。研究曲线桥的动力特性,评估其抗震能力,总结研究成果,提出结论和设计建议。更多还原

【Abstract】 As an important part of urban transit viaduct, city curve bridge is unrestricted in line, and terrain, etc, and the lines is smooth, need less construction funds, can well adapt to the surrounding environment, as a result, curve bridge is widely used. In recent years, the earthquake damage to city is more and more serious, and the traffic damage often exacerbated the post-earthquake disaster, greatly delayed relief time, give relief caused great distress, therefore, in the modern city construction, we pay more and more attention to the seismic problems city curve bridge. However, because of the complexity of the curve bridge, earthquake damage mechanism and theoretical research is still tiny, especially the long curve bridge theory research is very little, presses for further discussed.This paper discusses and analyses the next content: the structure of urban viaduct system, several structure forms of urban viaduct and viaduct tectonic characteristics, the upper structure of continuous box-girder section form, and the form of bearings and piers.This paper analyses the current research status of domestic and international bridge seismic, discusses the ground motion input mode and seismic response analysis method, the bridge’s tevolution of seismic design method and current research status is analyzed and studied, Put forward the current analyzed hotspots of high piers and curve longbridge, and gives the solution and research methods.This paper established the high piers and curve bridge dynamic finite element model, using response spectrum analysis to analyze the dynamic characteristics of the structure of high piers and curve bridge, Numerical simulation and comparative analyse the dynamic properties of curve bridge under four kinds of incentive circumstances:only consistent incentive、only traveling wave effect、only consider partial coherence effect and considering traveling wave effect and partial coherence effect, Evaluate the seismic capability, summarizes research advances conclusions and recommendations for design.更多还原