【作者】 张莉莉；

【导师】 李杰；

【作者基本信息】 郑州大学 ， 建筑与土木工程（专业学位）， 2013， 硕士

【摘要】 近年来,多跨连续刚构桥在实际中的应用越来越广泛,尤其是我国的西南和西北地区,高墩大跨径连续刚构桥无论在技术上还是经济上都有很大优势。连续刚构桥平衡悬臂施工过程中结构受力状态比较复杂,为了保证施工过程的安全性以及桥梁线形、应力符合设计要求,需要对施工过程和运营阶段结构的应力、变形进行验算;其次,在地震灾害中,作为生命线的桥梁工程往往损坏严重,因此研究桥梁的地震响应具有重要的意义。综上,本文的主要工作如下：首先,以五跨连续刚构桥——三灵快速通道上的弘农涧河特大桥为工程背景,采用大型桥梁专用有限元软件MIDAS/Civil建立了该桥的有限元模型,模拟了该桥悬臂施工的全过程,分析了施工过程中和运营阶段应力、变形情况,并讨论了运营阶段主要荷载工况对结构内力和变形的影响。其后,对弘农涧河特大桥进行反应谱分析,通过纵桥向+横桥向和纵桥向+横桥向+竖向两种地震输入方式,得出该桥在反应谱法输入下的地震响应的一些结论。最后,对弘农涧河特大桥进行动力时程响应分析,根据实际情况,选用了EL-Centro波,分析该桥在上述两种不同方向地震加速度组合作用下的响应,并进一步验证了反应谱分析得出的一些结论。最后比较反应谱法和时程分析法的计算结果,得出一些合理结论。通过上述分析能对弘农涧河特大桥以及同类桥梁的设计施工和抗震设计提供一定的参考。更多还原

【Abstract】 In recent years, the multi-span continuous rigid frame bridge is used more and more widely in the practical project. the long-span continuous rigid frame bridge with high-rise piers bridge has great advantages both in terms of technology and economy, especially in the Southwest and Northwest regions of our country. The stress state of the structure is very complex during the balanced cantilever construction process. In order to ensure that the construction process is safe and the bridge alignment and stress conform to design requirements, the stress and deformation in the construction process and operation stages need to be checked. Besides, as the lifeline,the bridges are usually seriously damaged in the earthquake, so it is of great importance to study the seismic response of the bridge. From what has been discussed above, the main work in this paper is as follows:Firstly, as to study the stress and deformation in the construction process and operation stages and discuss the influence on the stress and deformation of the main load condition, the finite element model of the five-span continuous rigid frame bridge--the HongNongJian extra-large bridge in the SanLing express lines is established to apply to large finite element software MIDAS/Civil.Secondly, the response spectrum analysis was carried out on the HongNongJian extra-large bridge by two different directions seismic input modes. One is longitudinal to the bridge and transverse to the bridge, the other is longitudinal to the bridge, transverse to the bridge and vertical to the bridge, some conclusions are obtained through the analysis.Finally, in order to analyze the response under the combination of the two different directions seismic acceleration of the bridge, and to further validate the conclusions of the response spectrum analysis, the dynamic time history response analysis was carried out on the HongNongJian extra-large bridge with the EL-Centro wave. According to analysis it draws some reasonable conclusions with the comparison of the results of the response spectrum analysis and time history analysis.From the analysis above, certain references about the design construction and seismic design can be provided to the HongNongJian extra-large bridge and the similar bridges.更多还原