【作者】 熊锴；

【导师】 周凌远；

【作者基本信息】 西南交通大学 ， 建筑与土木工程， 2013， 硕士

【副题名】近海重大交通工程结构全寿命抗震性能评价与设计

【摘要】 抗震设计是人们在生产实践中抵御地震自然灾害唯一有效手段,抗震设防的目的由单一的保障生命安全,逐渐转变为保障生命安全的同时减少灾害经济损失的双重要求。基于性能的抗震设计理论代表了当前抗震设计理论发展的新高度,为未来抗震设计理论的研究指明了方向。论文从四个方面系统总结了基于性能抗震设计的理论框架,这五个方面包括：地震设防水准、结构抗震性能水准、抗震性能目标、结构抗震性能分析方法和结构抗震设计方法等。并以抗震性能分析方法中的静力弹塑性分析方法为重点,介绍了其传统方法及其改进方法—改进能力谱法的原理和实施步骤。桥梁基于性能的抗震设计成为时下桥梁抗震设计研究的热点。桥梁墩柱作为桥梁主要抗侧力构件,在桥梁抗震设计研究中理应受到重视。众多研究多集中在墩柱直接基于位移的抗震设计研究。论文通过等强度延性谱构造非弹性位移反应谱,促进了等强度延性谱在抗震设计中应用；并以一个设计实例检验了该设计流程。论文结合开源软件OpenSees采用改进能力谱法和增量动力分析方法对一座实例桥墩的纵、横向抗震性能从静力和动力两个角度进行了分析和评价；四种设防水准下,静力方法计算结果比动力分析要小,且实例桥墩纵横向抗震性能存在较大差异；利用从PGMD中挑选的加速度时程记录,对实例桥墩进行了增量动力分析,获得了墩顶位移的IDA曲线；分析表明实例桥墩横桥向具有较强的抗震性能。并在原模型的基础上对相同截面形式的墩柱的抗震性能做了参数化研究；对比发现,随着高度的增加,墩顶位移逐渐增大。更多还原

【Abstract】 Seismic design is the only effective means to withstand earthquakes of natural disasters in people’s production practice. For decades seismic fortification purposes gradually shift from a single one guarantying life safety to dual requirements of protecting safety of life and reducing economic losses. Performance-based seismic design theory represents new heights of the current seismic design theory development,which points out the direction for the future seismic design theory research. This paper completely summarizes the content of performance-based seismic design theory framework from five aspects, which includes: seismic fortification level, seismic performance level, seismic performance objectives, structure seismic performance analysis methods and seismic design methods. And among seismic performance analysis methods pushover analysis methods is introduced detailedly, focusing on the principle and implementation steps of the traditional methods and its improved methods.Performance-based seismic design of bridge structures nowadays become a hot research on bridge seismic design. The pier is the main component of a bridge that resists the lateral force subjected to the bridge, therefore the seismic design of pier among the bridge seismic design study should be taken seriously. Numerous studies have mostly concentrated on the directly displacement-based seismic design studies of piers. In this method, the top displacement (the drift rate) of a pier is choosed as the design performance goal. The pier computational cycles can be determined through combining the design performance goal with the displacement response spectrum, and then get on the pier design forces for section design, and check the design pier seismic performance at last. In this paper, the inelastic displacement response spectrum is formed by equal strength ductility spectrum, and in according with the inelastic displacement response spectrum a new design iteration process is proposed, which promotes the engineering application of the equal strength ductility spectrum inseismic design. At last section in this chapter a piler example is designed to examine the design process proposed above.The vertical and horizontal seismic performance of an instance of the pier are analyzed and evaluated from static and dynamic two angles using the improved capacity spectrum method and the incremental dynamic analysis method in the paper with the open source software OpenSees. in four kinds fortification level,the results from the static method is smaller than tieh ones of the dynamic analysis and there is a big difference betwween the vertical and horizontal seismic performance of the pier instances. Utilizing the acceleration time history records selected from PGMD, an incremental dynamic analysis for instance pier is performed, and the pier top displacement IDA curve is obtained; analysis show that the transverse seismic performance of the example pier direction is strong. And the seismic performance of piers with the same cross-section as the original model do parametric study. Through comparison, as the height increases, the pier top displacement increases.更多还原