设有夹层橡胶支座的底框隔震结构的分析与研究

【作者】 郭小东；

【导师】 范进；

【作者基本信息】 南京理工大学 ， 固体力学， 2002， 硕士

【摘要】 本文的研究对象是底框隔震结构的建筑物，采用夹层橡胶垫隔震支座，对其进行分析与研究。 论文对该隔震结构建立了有限元模型，并用时程分析法分析了橡胶垫隔震结构的受力特点、上部结构的位移反应特点等内容。理论计算的结果表明，隔震体系安全可靠，计算简便；隔震结构在水平地震作用下的位移反应以“整体平动”为主，结构的变形集中在隔震层。 论文对上部结构相同的隔震建筑和不隔震建筑的抗震效果进行了比较。研究表明，底框隔震结构采用橡胶垫隔震支座时具有明显的隔震效果，它能大大减轻结构的水平地震作用。隔震结构的基底剪力、上部结构的层间剪力、层间位移都远远小于不隔震结构的计算结果。 针对隔震结构在不同地震波下响应的特征和程度的不同，本文对隔震结构的长周期效应进行了分析和探讨，并提出了隔震结构时程分析计算时地震波选取的建议和方法。 在隔震结构的设计过程中，对上部结构的设计现有的实用设计方法是采用“水平换算烈度”的方法。本文对这种方法计算的结果与时程分析法计算的结果进行了比较，证明了采用“水平换算烈度”方法是合理的，并提出了一些改进的措施。 另外还对隔震结构的优化设计、经济性能等进行了分析与研究。更多还原

【Abstract】 This paper mainly does the research with a base-isolated structure. The bearing of the structure is consists of Laminated Rubber Bearings(LRB).In the first, the finite element models are rendered to analysis the mechanical performance of the isolation structure. The results of earthquake time history analysis indicate that base isolation structure can effectively reduce the earthquake response of buildings. The LRB isolation is not only safe and liable, but also easy to analysis. The deformation of the structure mainly focused on the isolation layer and the superstructure shift as a whole.The results of earthquake time history analysis between the base-isolated structure and base-fixed structure are compared. The results indicate that the base shear, the interlayer shear, the interlayer displacement of the isolation system is far lower than the results of the base-fixed system under the same condition of the superstructure.According to the different response under different earthquake waves, the paper discussed the long-period character of the isolation structure. The results of analysis indicates that the isolation structure has better effect for the earthquake wave which was dominated of short-period wave.The method which is common used of designing the isolation structure is based on the concept of "level-conversion intensity". The more precise results must be obtained from the time history analysis. The results of the two methods are compared which show that the method of "level-conversion intensity" is reasonable. In addition, some advice and measurements are put forward.Finally, the paper discussed the optimization of designing, economical function and some others of LRB isolation system.更多还原