近断层脉冲型地震作用下不同动力特性隔震结构的反应特征研究

发布时间：2018-03-02 23:08

本文选题：近断层地震动　切入点：速度脉冲　出处：《合肥工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：近断层速度脉冲型地震动对建筑结构具有严重的破坏性。在设计建筑结构的过程中,有必要充分考虑结构在近断层地震动下的动力响应。本文以隔震结构为研究对象,研究其简化模型的建立,并在此基础上分析近断层速度脉冲型地震动对不同隔震结构的影响。再通过对隔震层设计的改进,降低隔震结构在近断层地震动下的反应,为隔震结构设计提供参考建议。主要研究成果如下:(1)首先结合近断层速度脉冲型地震的特征,运用定性识别方法和定量识别方法,筛选出方向性效应和滑冲效应速度脉冲型地震波。(2)采用天然地震波与速度脉冲模型叠加的方式,人工合成大量近断层速度脉冲型地震动,为分析速度脉冲型地震动对不同隔震结构的影响增强了对比性。(3)在研究连续化模型的基础上,针对其只能简化基础固定结构这一局限性,对其进行了改进。在有限元软件中,实现了对不同基础隔震结构简化模型的建立,使其能够有效模拟实际隔震结构在地震作用下的动力特性。(4)以42个具有不同层数及结构类型的隔震简化模型为研究对象,输入方向性效应和滑冲效应两种速度脉冲型地震动进行分析。结果表明:包含滑冲效应的速度脉冲型地震动对隔震结构影响较大。(5)以含有非线性隔震支座和不同阻尼比的线性阻尼隔震支座的隔震结构简化模型为研究对象,提出降低隔震结构在速度脉冲型地震动下结构响应的改善方法,并针对实际结构对该理论进行分析验证。结果表明:结合非线性隔震支座和阻尼比为0.1的线性阻尼隔震支座,能够有效减小速度脉冲型地震动对结构的影响。
[Abstract]:The near fault velocity pulse ground motion is very destructive to the building structure. It is necessary to fully consider the dynamic response of the structure under near-fault ground earthquake in the design of the building structure. In this paper, the isolated structure is taken as the research object. The simplified model is established, and the influence of near-fault velocity impulse ground motion on different isolation structures is analyzed. The response of isolation structure under near-fault ground earthquake is reduced by improving the design of isolation layer. The main research results are as follows: (1) considering the characteristics of near-fault velocity impulse earthquakes, qualitative and quantitative identification methods are used. A large number of near-fault velocity pulsed ground motions are artificially synthesized by the superposition of natural seismic waves and velocity pulse models. In order to analyze the effect of velocity pulse ground motion on different isolated structures, the contrast is enhanced. Based on the research of continuous model, this paper improves on the limitation that it can only simplify the fixed structure of foundation. In the finite element software, The simplified model of isolation structure with different foundation is established, which can effectively simulate the dynamic characteristics of the actual isolated structure under earthquake action. The 42 simplified isolation models with different layers and structure types are taken as the research object. The input directional effect and slip impact effect are analyzed. The results show that the velocity pulse ground motion with sliding impact effect has a great influence on the isolated structure. The simplified model of linear damping isolation bearing with damping ratio is studied. An improved method to reduce the response of isolated structures under velocity pulse ground motion is proposed, and the theory is analyzed and verified for the actual structures. The results show that the nonlinear isolation bearing and the linear damping isolation bearing with damping ratio of 0.1 are combined. It can effectively reduce the influence of velocity pulse ground motion on the structure.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU352.12

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