文档介绍：华中科技大学硕士学位论文I摘要连续梁受力明确,技术成熟,但需要大吨位橡胶支座,养护工作量大。连续刚构桥墩、梁固结改善了结构受到水平荷载(例如地震荷载)时的力学性能,跨越能力大,但固结墩受力复杂,适用条件有很多限制。刚构-连续组合梁桥兼顾了两者的优点又扬弃各自的缺点,特别是放宽长联大跨连续刚构桥对固结墩高度的要求,在结构受力、使用功能和适应环境等方面均具有一定的优越性。现代经济对交通命脉的依赖性越来越强,地震中桥梁这一交通线的枢纽工程一旦遭到破坏,会导致生命财产的巨大损失,因此要对重要桥梁进行抗震分析,采取必要预防措施。刚构-连续组合梁桥的抗震计算,现有抗震规范规定并不明确,本文依据新抗震设计细则有关抗震设计的规定,对北一路桥进行线性和非线性地震响应分析,以期为该工程设计提供依据和参考;为日后工作中抗震设计方面增加理论和实践经验。本文具体工作内容有以下几方面:1、以乌鲁木齐北一路桥为研究对象,编制了桥墩塑性铰截面的N-M-f关系程序,计算并绘制弯矩-曲率曲线,再按细则转换为等效双折线模型。2、根据该桥的特征,分别建立带索与不带索的ANSYS模型,了解该桥的动力特性。采用反应谱法和时程分析法计算结构在设计反应谱和三条典型地震波作用下的地震响应,全面了解该桥的抗震性能,为该工程设计提供依据和参考。3、BIN40弹簧单元来模拟塑性铰区域的材料非线性特性,建立全桥带索有限元模型。选择Taft波进行一致激励作用下的地震响应时程分析,研究刚构-连续组合梁桥在地震作用下顺桥向和横桥向考虑非线性的抗弯性能,并与线性分析结果进行了对比。关键词:刚构-连续组合延性抗震设计地震响应时程分析法弯矩-曲率华中科技大学硕士学位论文IIAbstractContinuous bridges are advanced inbetter mechanical performance andperfecttechnique, but need rubber bearings with large tonnage, and large amount of maintenancework. Thefixed pier of continuous rigid-frame bridges improves the mechanical performance of structure under horizontal load( such as the action of earthquake). This structure has better crossover capability, but its serviceable range is limited because of plex stress of fixed pier. Rigid frame-posite girder bridges have the advantage of both styles and e their disadvantage. They are particularly good in mechanical characteristics, using functions and environment adaptability, because the demand of the height of fixed pier is pared to that of long unitand long spancontinuous rigid-frame economy depends on the traffic line more and more. Once bridges - the key projects of traffic line- were ruined in earthquake, it would lead to great losses of life and property. Therefore, Seismic Response Analysis and necessary preventive measure must be taken to protecting the bridges of great importance. The calculations of rigid frame -posite system girder bridges are not defined clearly inexisting seismic code. Based on relevantguidelines about seismic designin the new guidelines for seismic desig