大跨度刚构桥近断层脉冲型地震动非线性反应分析-土木工程、结构工程专业论文.docx

Classified Index：TU311.3 U.D.C.：624.042.7 Thesis for the Master Degree in Engineering NONLINEAR RESPONSE ANALYSIS OF LONG-SPAN RIGID FRAME BRIDGES SUBJECTED TO NEAR-FAULT PULSE-LIKE GROUND MOTIONS Candidate：Zhou QianSupervisor Candidate： Zhou Qian Supervisor： Asso. Prof. Z Academic Degree Applied for： Master of En Specialty： Civil Engine Affiliation： School of Ci Date of Defense： June, 2008 Degree-Conferring-Institution： Harbin Instit ering Structural Engineering vil Engineering ute of Technology 摘要 近断层地震动是近年来地震工程和工程抗震领域共同关注的一个热门话 题。近断层地震动由于其特殊的作用效应，会对工程结构造成极大破坏，给 人类社会带来了巨大的财产损失和人员伤亡。目前虽然在近断层地震动研究 方面取得了一定的进展，但要弄清楚近断层地震动的特性及近断层地震动作 用下结构的反应，还有大量的工作要做。 本文围绕近断层脉冲型地震动特征及其作用下桥梁的反应，进行了以下 几个方面的研究工作： (1)用有限元软件 MIDAS/CIVIL 建立了大跨度刚构桥空间有限元模型， 为了更准确的模拟桥梁在地震动作用下的反应，桥墩利用空间纤维梁单元建 立，并考虑桥墩材料非线性，对此桥的动力特性做了分析。 (2)利用台湾地区的四个台站在集集地震中得到的近断层脉冲型地震动 记录和其它三次地震中得到的远断层记录，研究了桥梁在近断层脉冲型地震 动与远断层地震动作用下的各自反应特点与相互间的异同。 (3)搜集大量近断层脉冲型地震动记录和远断层地震动记录，研究了近 断层脉冲型地震动参数和远断层地震动参数与桥梁非线性反应之间的相关 性，并进行了比较分析，给出了可以较好表达近断层脉冲型地震动和远断层 地震动对大跨度刚构桥破坏势的参数。 (4)利用台湾地区的四个台站获得的近远断层地震动记录，研究了竖向 地震动对桥梁结构的影响，并对近断层和远断层情况分别进行了对比分析， 最后对桥梁抗震设计提出了建议。 关键词 近断层脉冲型地震动；竖向地震动；大跨度刚构桥；非线性时程 分析；地震动潜在破坏势 Abstract Study on near-fault ground motions has become an important topic in the area of earthquake engineering. Near-fault ground motions, as their special effect, will cause great damage of structures. Although some progresses have been obtained on research of near-fault ground motions, there are still a lot of work should be conducted to study the characteristics of the near-fault ground motions and the structural response subjected to near-fault ground motions. The characteristics of near-fault ground motions and the seismic response of rigid frame bridge subjected to near-fault ground motions are discussed in this thesis: The space finite element model of a long-span frame bridge is established by MIDAS / CIVIL. In order to simulate the seismic response of the bridge accurately, the pier models are established with space fiber beam elemen