带有橡胶支座的某超限钢框架结构隔震分析

发布时间：2018-10-18 19:47

【摘要】：相对于传统的抗震原理,隔震结构依靠隔震层的耗能装置而不是自身构件来耗散地震能量,为降低结构震害提供了新的思路。在结构底部设置隔震层可以减小结构的自振频率,改变自振周期,耗散来自地震的能量,使得结构上部的地震响应同时减弱。现如今,随着人们对于隔震技术的不断深入研究,已经形成了一套比较完整的理论,并在日本、欧美等国家得到了相对广泛的应用。本文在总结了国内外各种研究的有关成果,充分了解隔震原理和技术的基础上对于某超限钢框架结构设置了叠层橡胶支座隔震层,对其隔震前后的地震响应进行分析,将超限与非超限结构的隔震效果进行对比,同时对超限结构进行了抗震验算。本文首先介绍了隔震结构和隔震原理以及常用的叠层橡胶隔震支座的组成和力学性能,随后对于常用地震响应分析方法的原理和特点进行了阐述。在此基础上以某超限钢框架结构为例,设置隔震层,采用大型有限元分析软件SAP2000对于隔震与非隔震结构在多遇地震下的响应进行对比分析,说明了叠层橡胶隔震支座在钢框架结构中的减震效果和规律。将超限结构与非超限结构在多遇地震下的响应进行对比。同时对于超限隔震结构在设防地震下的响应进行振型分解反应谱和时程分析,将二者的结果对比。最后对于罕遇地震下的超限隔震结构进行验算。隔震与非隔震结构的对比分析表明,叠层橡胶隔震支座起到了比较显著的减震作用。超限与非超限的隔震效果对比得知,隔震层对于超限结构起到的效果更加明显。进行隔震设计的超限结构在多遇地震、设防地震以及罕遇地震下的验算都能满足相关规范的要求,具有良好的抗震性能。使用橡胶支座进行隔震是最早人们开始研究并且应用在实践当中的隔震技术之一,但是相对于人们建立起来的数目庞大的多、高层结构来说,隔震技术并没有得到全面的普及和使用。本文对于某实际工程的隔震分析只是一个例子,希望对于类似结构能够起到参考作用。随着隔震理论的不断成熟,隔震技术的逐步创新,橡胶支座隔震技术在未来一定可以得到更加广泛的应用。
[Abstract]:Compared with the traditional aseismic principle, the isolated structure dissipates the seismic energy by the energy dissipation device of the isolation layer rather than its own component, which provides a new way of thinking for reducing the seismic damage of the structure. The isolation layer at the bottom of the structure can reduce the natural frequency of the structure, change the natural vibration period, dissipate the energy from the earthquake, and make the seismic response of the upper part of the structure weaken at the same time. Nowadays, with the further study of isolation technology, a set of relatively complete theory has been formed, and has been relatively widely used in Japan, Europe and the United States and other countries. In this paper, on the basis of summarizing the relevant research results at home and abroad and fully understanding the principle and technology of isolation, a laminated rubber bearing isolation layer is set for a steel frame structure, and the seismic response before and after isolation is analyzed. The seismic isolation effect of the out-of-limit structure is compared with that of the non-over-limit structure, and the aseismic checking calculation of the over-limit structure is carried out at the same time. In this paper, the structure and principle of isolation, the composition and mechanical properties of the common laminated rubber isolation bearings are introduced, and the principle and characteristics of the commonly used seismic response analysis methods are described. On this basis, taking a steel frame structure as an example, the isolation layer is set up, and the response of isolated and non-isolated structures under frequent earthquakes is compared with that of non-isolated structures by using the large-scale finite element analysis software SAP2000. The damping effect and regularity of laminated rubber isolation support in steel frame structure are explained. The response of the over-limit structure and the non-over-limit structure under the frequent earthquake is compared. At the same time, the vibration mode decomposition response spectrum and time history analysis are carried out for the response of the exceedingly isolated structure under earthquake fortification, and the results are compared with each other. Finally, the exceedingly isolated structures under rare earthquakes are checked and calculated. The comparative analysis of isolated and non-isolated structures shows that the laminated rubber isolation supports play a significant role in reducing earthquake. The results show that the effect of isolation layer is more obvious than that of over limit structure. The checking calculation of the isolated structures under frequent earthquakes, fortification earthquakes and rare earthquakes can meet the requirements of relevant codes and have good seismic performance. The use of rubber bearings for isolation is one of the earliest isolation techniques that people began to study and apply in practice, but compared to the large number of structures built by people, high-rise structures, Isolation technology has not been fully popularized and used. In this paper, the isolation analysis of a practical project is only an example, and it is hoped that it can be used as a reference for similar structures. With the maturation of the isolation theory and the gradual innovation of the isolation technology, the rubber bearing isolation technology will be more widely used in the future.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU391;TU352.12

【相似文献】