近断层地震下高架连续梁桥地震响应分析及减隔震控制

发布时间：2018-05-19 09:41

本文选题：高架连续梁桥 + 近断层地震　；参考：《哈尔滨工业大学》2015年硕士论文

【摘要】：近断层地震动近些年来开始引起工程界重视,因为其相对于远场地震动来说有自身的特点,如速度时程中包含的大脉冲和长周期成分含量高等,以往的抗震设计经验和抗震规范都没有对其做到足够的考虑,随着很多地震中近断层区域桥梁的严重破坏,对近断层地震动的专门考虑是十分必要的。高架桥桥墩比较高,柔度比较大,在近断层地震作用下更能够激发出长周期大位移的振型,从而破坏比较严重。本文在已有的研究基础上,总结了已有文献对近断层地震动的研究和描述,然后以某一四跨高架连续梁桥作为研究对象,进行了系统的地震激励响应分析,主要内容如下:总结近断层地震动文献的研究成果,归纳了近断层地震动加速度时程的特点,选取了集集地震动记录中的典型的几条地震动加速度时程,和常用的El-Centro波以及人工合成波,区分近断层和远场的区别作为输入地震波。建立了一联四跨连续梁桥空间有限元模型,比较了近断层地震波激励下高架桥结构的动力反应和其他地震波激励下的区别。在桥台伸缩缝处加入了碰撞单元,进一步分析在考虑碰撞的情况下近断层地震激励下高架连续梁桥的动力反应。并比较了不同桥墩高度情况下连续梁桥的碰撞响应特点,并对此进行了总结。最后选取了几种可靠性比较高的被动减隔震装置:Lockup装置、粘滞阻尼器和铅芯橡胶支座,安装于滑动墩以及桥台上,区分近场和远场地震激励,计算分析了这三种减隔震装置的减隔震效果,并对不同的地震波激励做了减隔震效果的比较,并对高架连续梁桥的抗震设计给出了建议。
[Abstract]:In recent years, near-fault ground motion has attracted the attention of the engineering community, because it has its own characteristics relative to the far-field ground motion, such as the high content of large pulses and long-period components in the velocity process, etc. Previous seismic design experience and seismic code have not been considered enough. With the serious damage of bridge near fault area in many earthquakes, it is very necessary to consider the near-fault earthquake. The pier of viaduct is relatively high and the flexibility of viaduct is large. The vibration mode of long period and large displacement can be excited under the action of near-fault ground earthquake and the damage is more serious. On the basis of existing research, this paper summarizes the research and description of near-fault ground earthquake, and then takes a four-span viaduct continuous beam bridge as the research object, and makes a systematic analysis of seismic excitation response. The main contents are as follows: summarize the research results of near-fault seismic dynamic literature, sum up the characteristics of near-fault seismic acceleration time history, select several typical ground motion acceleration time history in collecting ground motion record, The difference between near fault and far field is used as input seismic wave with El-Centro wave and synthetic wave. The spatial finite element model of a four-span continuous beam bridge is established, and the difference between the dynamic response of viaduct structure under near-fault ground seismic wave excitation and that of other seismic waves is compared. A collision element is added to the bridge abutment expansion joint to further analyze the dynamic response of the elevated continuous beam bridge under near-fault earthquake excitation. The impact response characteristics of continuous beam bridges with different piers height are compared and summarized. In the end, several kinds of passive isolation devices with high reliability, namely, the structure of the passive isolation device, the viscous damper and the lead rubber bearing, are selected and installed on the sliding pier and abutment to distinguish the near-field and far-field seismic excitation. The effects of the three kinds of isolation devices are calculated and analyzed, and the seismic isolation effects of different seismic waves are compared, and some suggestions for seismic design of elevated continuous beam bridges are given.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55

【参考文献】