近断层地震作用下橡胶基础隔震的影响研究

发布时间：2018-05-20 07:42

本文选题：近断层地震 + 水平-竖向相关性　；参考：《武汉理工大学》2015年硕士论文

【摘要】：基础隔震技术广泛的应用于当今的建筑结构的隔震减震设计中;有效的减轻结构在地震作用下的反应和破坏,显著提高了建筑结构的防震减灾能力。它是工程结构被动控制的主要形式之一,在基础隔震技术发展的几十年间,提出了应用于各种隔震支座的力学模型。其中,最重要的是铅芯橡胶支座的弹簧刚架力学模型。它可以模拟支座的几何非线性和材料非线性两种特征,是迄今为止较为成熟的力学模型。然而,随着国内外学者对于基础隔震结构地震响应研究的深入,发现了一些问题有待进一步的探讨研究。在此背景下,本文主要进行了以下几方面的研究:(1)本文利用前人提出的弹簧钢架模型,结合上部结构组成的多自由度运动体系,建立运动平衡方程;并且利用Newmark??法求解双质点多自由度动力学运动方程。(2)水平--竖向相关性是本文的另一个重点;通过控制铅芯橡胶隔震支座的力学模型参数来控制水平--竖向相关性的影响水平。隔震结构分为四种工况来计算基础隔震结构的地震响应,并作了相应的对比分析工作。研究结果表明:当在罕遇地震作用下,竖向相关性的影响更加明显;尤其是在近断层罕遇地震作用下尤为突出。(3)常规地震与近断层地震动的特征明显不同,这种不同之处必然会通过地震加速度反应时程曲线的加载来影响到隔震结构的地震响应;并对不同类型地震作用下的地震响应作了对比分析得出了一些重要的结论;数值分析结果表明:近断层地震作用下隔震结构的竖向加速度与竖向位移响应将会明显增大,并且考虑竖向相关性后还会明显影响到水平位移和水平加速度的最大值。(4)本文中以八层剪切型结构为研究对象,通过MATLAB编程求得了原结构和隔震结构在各种工况作用下的地震反应。并且通过有限元分析软件Sap2000进行验证MATLAB程序计算结果的有效性。通过这些地震反应的分析可知这对于以后修订建筑抗震设计规范将给出有益的建议与要求。
[Abstract]:The technology of foundation isolation is widely used in the design of isolation and damping of building structures, which can effectively reduce the response and damage of structures under earthquake, and improve the ability of earthquake prevention and mitigation of building structures. It is one of the main forms of passive control in engineering structures. In the decades of the development of foundation isolation technology, the mechanical models applied to various isolation bearings are put forward. Among them, the most important is the mechanical model of spring frame of lead rubber bearing. It can be used to simulate the geometric nonlinearity and material nonlinearity of the bearing, and it is a mature mechanical model up to now. However, with the in-depth study of seismic response of base-isolated structures, some problems need to be further studied. In this context, this paper mainly studies the following aspects: 1) this paper uses the spring steel frame model proposed by the predecessors, combined with the upper structure of the motion system of multiple degrees of freedom to establish the motion balance equation, and use the Newmark? It is another important point in this paper to solve the dynamic equation of motion of double particle with multiple degrees of freedom. The horizontal vertical correlation is controlled by controlling the mechanical model parameters of the lead-core rubber isolation bearing. The isolated structure is divided into four working conditions to calculate the seismic response of the base isolated structure, and the corresponding comparative analysis work is done. The results show that the effect of vertical correlation is more obvious under rare earthquakes, especially in the case of rare earthquakes on near faults. The characteristics of conventional earthquakes are obviously different from those of near-fault ground earthquakes. This difference is bound to affect the seismic response of isolated structures by loading the time-history curve of seismic acceleration response, and some important conclusions are obtained by comparing and analyzing the seismic responses of different types of earthquakes. The results of numerical analysis show that the vertical acceleration and vertical displacement responses of isolated structures will increase obviously under the action of near-fault ground earthquakes. Considering the vertical correlation, the maximum value of horizontal displacement and horizontal acceleration will be significantly affected.) in this paper, the eight-story shear structure is taken as the research object. The seismic responses of the original structure and the isolated structure under various working conditions are obtained by MATLAB programming. The validity of the calculation results of the MATLAB program is verified by the finite element analysis software Sap2000. Through the analysis of these seismic responses, it can be seen that this will provide useful suggestions and requirements for revising the seismic design code of buildings in the future.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU352.12

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