大跨径自锚式悬索桥地震响应分析

发布时间：2018-03-28 06:51

本文选题：大跨径自锚式悬索桥　切入点：动力特性　出处：《武汉理工大学》2014年硕士论文

【摘要】：自锚式悬索桥作为一种新颖的桥梁结构，因其造型美观、选址灵活以及经济效益好而越来越受到青睐，已成为中小桥跨结构中极具竞争力的方案之一。从既有的研究资料来看，自锚式悬索桥虽然应用广泛，但因其结构复杂，设计、施工理论仍需进一步完善。本文以主跨406m的桃花峪黄河特大桥主桥为工程背景，，对大跨径自锚式悬索桥的动力特性及地震响应进行了系统的分析研究，主要内容如下： (1)论述了大跨径自锚式悬索桥地震响应的分析方法，并对各种地震响应的计算方法进行了评价； (2)利用Midas/civil2012建立空间有限元模型，对大跨径自锚式悬索桥的动力特性进行了分析，并研究了矢跨比、恒载集度和结构刚度等参数的变化对桥梁结构成桥状态动力特性的影响。 (3)根据场地设计反应谱，按照两水准抗震设防目标的要求，在两种概率水准(El、E2)的地震动作用下，采用反应谱法分析了桃花峪黄河大桥主桥（无桩计算模型）在纵向、横向、竖向以及两种组合地震动作用下桥梁结构的地震响应。 (4)采用改进的El-Centro波作为地震动输入对桃花峪黄河大桥主桥（无桩模型）进行了一致激励下地震响应的动态时程分析，并与反应谱法的计算结果进行对比分析，探讨了反应谱法在大跨度自锚式悬索桥抗震分析中的局限性；并且研究了在多点激励下，行波效应对大跨径自锚式悬索桥地震响应的影响。
[Abstract]:As a novel bridge structure, self-anchored suspension bridge is more and more popular because of its beautiful shape, flexible location and good economic benefit. It has become one of the most competitive schemes in medium and small span structures. Although self-anchored suspension bridge is widely used, because of its complex structure and design, the construction theory still needs to be further improved. This paper takes the main bridge of Taohuayu Yellow River Bridge with the main span of 406m as the engineering background. The dynamic characteristics and seismic response of long-span self-anchored suspension bridge are systematically analyzed and studied. The main contents are as follows:. 1) the seismic response analysis method of long span self-anchored suspension bridge is discussed, and the calculation methods of seismic response are evaluated. 2) the dynamic characteristics of long-span self-anchored suspension bridges are analyzed by using the spatial finite element model established by Midas/civil2012, and the influence of the parameters such as the ratio of vector to span, the density of dead load and the stiffness of the structure on the dynamic characteristics of the bridge is studied. 3) according to the site design response spectrum and according to the requirements of the two level seismic fortification targets, under the ground motion action of two probabilistic leveling, the longitudinal and lateral direction of the main bridge (without pile calculation model) of Taohuayu Yellow River Bridge is analyzed by using the response spectrum method. Seismic response of bridge structure under vertical and combined ground motion. 4) dynamic time history analysis of seismic response of the main bridge of Taohuayu Yellow River Bridge (without pile model) under uniform excitation is carried out by using improved El-Centro wave as ground motion input, and the results are compared with the calculated results of response spectrum method. The limitation of response spectrum method in seismic analysis of long-span self-anchored suspension bridge is discussed, and the effect of traveling wave effect on seismic response of long-span self-anchored suspension bridge under multi-point excitation is studied.
【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;U448.25

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