强震作用下基础隔震结构碰撞分析及中日规范下响应对比

发布时间：2018-03-08 01:31

本文选题：基础隔震结构　切入点：强烈地震　出处：《西南交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：基础隔震技术能够显著减少传入上部结构的地震能量,减小地震对上部结构的破坏。但由于基础隔震耗能装置多为延性构件,水平刚度小,因此在地震作用下水平侧移很大,可能导致隔震结构的基底与周边隔震沟挡墙或其他构造物发生碰撞。所以,研究结构在地震作用下的碰撞反应,对保证地震下的结构安全具有参考作用。由于日本处在地震多发带,开展抗震设计理论研究的时间早于中国,因此日本的抗震设计理论体系相对完备,其抗震隔震设计有值得中国借鉴的地方。所以对比分析隔震结构在两国抗震设计规范规定的地震动作用下的结构响应,找出二者的差异很有必要。本文以基础隔震结构为对象,开展了以下几方面的研究:I.详细的介绍现有的结构碰撞研究方法以及常用的碰撞分析模型,比较各类分析方法的异同和优缺点,介绍本文使用的有限元软件。II.描述碰撞运动方程的建立过程。结合工程实例建立了铅芯橡胶和摩擦摆基础隔震结构这两类隔震结构的有限元模型,研究了强震下隔震层与周边构造物碰撞对结构反应的影响。通过定义碰撞影响指数,重点进行了结构碰撞的参数分析,研究了地震方向变化、支座类型、建筑物高度对隔震建筑碰撞反应的影响,得到了一些结论。III.结合工程实例建立了以铅芯橡胶支座为隔震层的基础隔震结构有限元模型。选取2条实际观测地震记录以及3条人工地震波,基于中日抗震设计规范对所选地震动进行调幅。通过对比分析隔震结构在中国和日本抗震设计规范中震及大震作用下的隔震支座最大水平位移、层间位移角的最大值、最大层间剪力、顶层节点最大绝对加速度,以及中、日两国抗震规范制定的相应的限值,以期能够为中国建筑抗震设计规范编制提供一定参考。
[Abstract]:Foundation isolation technology can significantly reduce the seismic energy transmitted to the superstructure and reduce the earthquake damage to the superstructure. However, because the energy dissipation devices of the foundation isolation are mostly ductile members and the horizontal stiffness is small, the horizontal lateral displacement is very large under the earthquake action. The base of the isolated structure may collide with the surrounding isolation ditch retaining wall or other structures. It is useful for ensuring the safety of structures under earthquake. Because Japan is in the earthquake-prone zone and the research time of seismic design theory is earlier than that of China, the seismic design theory system in Japan is relatively complete. Therefore, it is necessary to compare and analyze the structural responses of the isolated structures under the ground motion as stipulated in the seismic design code of the two countries, and find out the difference between the two. This paper takes the base-isolated structure as the object. The following studies are carried out: I. the existing structural collision research methods and the commonly used collision analysis models are introduced in detail, and the similarities, differences, advantages and disadvantages of various analytical methods are compared. In this paper, the finite element software, I. I., is used to describe the process of establishing the equation of motion of collision. Combined with engineering examples, the finite element models of two kinds of isolated structures, lead rubber and frictional pendulum foundation isolation structures, are established. The influence of the collision between the isolation layer and the surrounding structure on the structure response under strong earthquake is studied. By defining the impact index, the parameter analysis of the structural collision is carried out, and the direction change of the earthquake and the type of the bearing are studied. Impact of Building height on impact response of isolated buildings, Some conclusions. III. combined with engineering examples, the finite element model of foundation isolation structure with lead-rubber bearing as isolation layer is established. Two actual observational seismic records and three artificial seismic waves are selected. Based on the seismic design code of China and Japan, the amplitude modulation of the selected ground motion is carried out. The maximum horizontal displacement and the maximum displacement angle between floors of isolated structures under the action of Chinese and Japanese seismic design codes are analyzed. The maximum interstory shear force, the maximum absolute acceleration of the top joint, and the corresponding limit values of the seismic code of China and Japan can be used as reference for the compilation of the code for seismic design of Chinese buildings.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU352.12

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