高阻尼基础隔震结构的近断层地震响应机理初步研究

发布时间：2018-07-23 18:33

【摘要】：地震是难以预测的对人类危害非常严重的灾难之一，具有灾难性和突发性的特点，对工程结构抗震设计的研究一直是人们研究的重点。近断层地震动具有显著不同于普通远场地震动的特征，，对结构造成的影响也更为明显。隔震技术由于良好的减震效果被广泛的推广应用。铅芯隔震橡胶支座应用较广，但存在导致结构偏心及污染环境的问题，而高阻尼隔震橡胶支座由于性能单一，无污染被越来越广泛应用。本论文就是研究在近远场地震动作用下采用这两种隔震橡胶支座分别建立的隔震结构的对比分析。本论文使用SAP2000有限元软件分别建立了上部结构相同的非隔震结构、采用高阻尼隔震橡胶支座的隔震结构和采用铅芯隔震橡胶支座的隔震结构。其中，采用高阻尼隔震橡胶支座的隔震结构是在采用铅芯隔震橡胶支座的隔震结构的基础上，保证隔震层平均等效水平刚度相同，等效阻尼比大大提高的条件下建立的。通过非线性时程分析对比了这三种结构在普通远场地震动和近断层地震动作用下结构的动力响应。并通过增加高阻尼隔震橡胶支座的等效阻尼比来探究两种隔震结构在近断层地震动作用下的结构动力响应。在普通远场地震动作用下，采用铅芯隔震橡胶支座的隔震结构减震效果要比采用高阻尼隔震橡胶支座的隔震结构好；在近断层地震动作用下，两种隔震结构减震效果非常接近。随着等效阻尼比的提高，采用高阻尼隔震橡胶支座的隔震结构与采用铅芯隔震橡胶支座的隔震结构相比，呈现出结构下部反应要小，结构上部反应大的特点。
[Abstract]:Earthquake is one of the most serious disasters to human being which is difficult to predict and has the characteristics of disaster and sudden. The research on seismic design of engineering structures is always the focus of people's research. The near-fault ground motion is obviously different from the ordinary far-field ground motion, and the influence on the structure is more obvious. Isolation technology has been widely used because of its good damping effect. Lead isolated rubber bearings are widely used, but they lead to structural eccentricity and environmental pollution, while high damping isolation rubber bearings are used more and more widely because of their single performance. This paper is to study the comparison and analysis of the isolation structure established by using the two kinds of isolation rubber bearings under the action of near far field ground motion. In this paper, SAP2000 finite element software is used to establish the non-isolation structure with the same superstructure, the isolation structure with high damping rubber bearing and the isolation structure with lead-core rubber bearing. Among them, the isolation structure with high damping rubber bearing is established on the basis of the isolation structure with lead-core isolation rubber bearing, which ensures that the average equivalent horizontal stiffness of the isolation layer is the same and the equivalent damping ratio is greatly improved. Through nonlinear time-history analysis, the dynamic responses of the three structures under conventional far-field ground motion and near-fault seismic action are compared. By increasing the equivalent damping ratio of the rubber bearing with high damping, the dynamic response of the two isolation structures under the action of near-fault earthquake is studied. Under the action of ordinary far field ground motion, the effect of isolation structure with lead core isolation rubber bearing is better than that with high damping isolation rubber bearing, and the effect of the two isolation structures is very close under the action of near-fault ground earthquake. With the increase of the equivalent damping ratio, the isolated structure with high damping rubber bearing has the characteristics of smaller response in the lower part of the structure and greater response in the upper part of the structure compared with that of the rubber bearing with lead core isolation.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU352.12

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