【作者】 李杨；

【导师】 徐勤；

【作者基本信息】 合肥工业大学 ， 建筑与土木工程（专业学位）， 2017， 硕士

【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。更多还原

【Abstract】 The near-fault velocity pulse type ground motion has a serious damage to the building structure.In the design of building structures,it is necessary to fully consider the dynamic response of structures under near-fault ground motions.This paper analysis the influence on different isolated structures simplified model of near-fault velocity pulse ground motion.The paper improve the design of the isolated structures,which can reduce the response of the isolated structure under the near-fault ground motion.The main research results are as follows:1.Combined with the characteristics of near-fault velocity pulse type,qualitative identification and quantitative identification methods were used to screen out the nearfault velocity pulse ground motion with forward directivity effect and fling-step effect.2.Stacking natural seismic wave and velocity pulse model to manufacture numbers of near-fault velocity pulse ground motions,which enhanced the effect of constructing different velocity pulse ground motion on isolated structures.3.By fixing the limitation,the continuous simplified model of different base isolated structures is realized in the finite element software,which can effectively simulate the dynamic characteristics of the isolated structure under seismic action.4.Based on 42 simplified model of seismic isolation with different structure types,the paper analyzes the effect of the near-fault velocity pulse ground motion with forward directivity effect and fling-step effect.The results show that the velocity pulse ground motion with fling-step effect has great influence on the isolation structure.5.By researching the simplified model of isolation structure with nonlinear bearings and linear damping bearing with different damping ratio,the paper put forward the improvement method to reduce the speed of pulse type isolated structure in the seismic response of the structure,and verify the correctness of the theory by analyzing the actual structure.The results show the effectively reducing of the influence of velocity pulse ground motion on the structure on the combination of nonlinear isolation bearing and linear damping bearing which ratio is 0.1.更多还原