近断层地震作用下多高层隔震结构地震响应分析

发布时间：2018-11-20 14:50

【摘要】：隔震结构通过设置隔震层延长了结构的自振周期，有效地避开了场地卓越周期，同时隔震层中的耗能装置还能够吸收和消耗地震动输入结构的能量，从而降低了结构的地震响应。隔震技术从20世纪20代开始在工程中尝试使用至今，经历了近一个世纪地发展，已经走向成熟。如今，在美国、日本等发达国家已经设计和建成的隔震建筑都在千幢以上。随着近些年强烈地震地频频发生，人们越来越认识到近断层地震给结构物带来的危害可能比远场地震更严重，并且随着人类地球科学技术的发展，地震发生时，，越来越多的地震波被记录下来，这些都为研究结构物在近断层地震作用下的响应提供了条件。近断层地震波中的长周期成分往往被加强，这就有可能给自振周期同样较长的隔震结构带来不利影响，因此研究隔震结构在近断层地震作用下的响应就十分有必要了。本文通过对一工程实例进行分析，对比研究了隔震结构与非隔震结构在近断层地震和远场地震作用下加速度响应和层间位移响应，得到如下结论：（1）在近断层地震作用下，隔震层仍能起到降低结构地震响应的作用。（2）隔震结构在近断层地震作用下其隔震层及上部楼层层间位移比远场地震下有所增大，其加速度较远场地震下变异性也更大。（3）低剪切弹性模量的铅芯橡胶隔震支座隔震效果更好。
[Abstract]:The isolation structure extends the natural vibration period of the structure by setting the isolation layer and effectively avoids the outstanding period of the site. At the same time, the energy dissipation device in the isolation layer can also absorb and consume the energy of the input structure of the ground motion. Thus, the seismic response of the structure is reduced. Isolation technology has been used in engineering since 20 ~ (th) century, and has been developed for nearly a century. Today, in the United States, Japan and other developed countries have designed and built more than 1000 buildings. With the frequent occurrence of strong earthquakes in recent years, it is increasingly recognized that near-fault earthquakes may bring more serious damage to structures than far-field earthquakes, and with the development of human Earth science and technology, when earthquakes occur, More and more seismic waves are recorded, which provide conditions for studying the response of structures to near-fault earthquakes. The long-period components of near-fault seismic waves are often strengthened, which may have a negative impact on isolated structures with the same natural vibration period, so it is necessary to study the response of isolated structures under near-fault earthquake. Based on the analysis of an engineering example, the acceleration response and the interstory displacement response of isolated structure and non-isolated structure under near-fault and far-field earthquakes are studied in this paper. The conclusions are as follows: (1) under the action of near-fault earthquake, the isolated layer can still play a role in reducing the seismic response of the structure. (2) under the action of near-fault earthquake, the displacement of isolated layer and upper floor of isolated structure is larger than that of far-field earthquake, and its acceleration is more variable than that of far-field earthquake. (3) the lead rubber bearing with low shear modulus is more effective.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU352.12

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