近断层地震动对基础隔震结构动力响应的影响

发布时间：2018-04-03 03:18

本文选题：近断层地震动　切入点：基础隔震　出处：《郑州大学》2017年硕士论文

【摘要】：随着近断层地震的频发,学界关于近断层地震动的认识与研究不断深入。速度脉冲效应作为近断层地震动的重要特性也逐渐被了解,脉冲型地震动相对于普通地震动,速度幅值更大,包含更高的能量。同时,基础隔震结构的应用越来越成熟,其在普通地震动作用下良好的隔震性能已经得到充分体现,但是,基础隔震结构在脉冲型地震动作用下隔震效果如何,脉冲型地震动又会如何影响基础隔震结构,有待研究。我国一些主要城市位于近断层区域,面临着脉冲型地震动的威胁,这些研究也将为近断层地区基础隔震结构的分析与设计提供依据。为了深入研究近断层脉冲型地震动以及摩擦摆基础隔震结构在脉冲型地震动作用下动力响应的特点,本文主要做了以下工作:(1)归纳122组近断层脉冲型地震动的PGA、PGV、PGV/PGA等参数,提取地震动脉冲周期,分析脉冲型地震动参数的特点以及脉冲周期与其他参数间的关系,表明脉冲周期对脉冲型地震动的幅值与频谱特征均有影响。(2)对脉冲型地震动与非脉冲型地震动作用下基础隔震结构的响应进行分析,表明隔震结构在脉冲型地震动作用下隔震效果受到不利影响,结构响应较非脉冲型地震动作用下增大。(3)通过输入不同速度脉冲周期的地震动,分析脉冲周期对隔震结构动力响应的影响,表明脉冲周期为结构自振周期的1.5~3.5倍时,隔震结构的地震响应明显增大。(4)对地震动特征参数与基础隔震结构响应指标进行相关性分析,研究各特征参数对结构响应的影响,表明PGV、Arias烈度、能量密度等参数与隔震结构响应相关程度较高,PGV/PGA、PGD/PGV与结构响应的相关性较小。
[Abstract]:With the frequent occurrence of near-fault earthquakes, the knowledge and research of near-fault-ground earthquakes have been deeply studied in academic circles.As an important characteristic of near-fault ground motion, velocity pulse effect is gradually understood. Compared with ordinary ground motion, pulse type ground motion has larger velocity amplitude and higher energy.At the same time, the application of base-isolated structure is more and more mature, and its good isolation performance under the action of ordinary ground motion has been fully reflected. However, the isolation effect of base-isolated structure under the action of impulse ground motion has been fully reflected.How the pulsed ground motion will affect the base isolation structure remains to be studied.Some major cities in China are located in the near fault area and face the threat of pulsed ground motion. These studies will also provide the basis for the analysis and design of the basic isolation structure in the near fault area.In order to deeply study the dynamic response of near-fault pulsed ground motion and frictional pendulum foundation isolation structure under impulse ground motion, the following work has been done in this paper: 122 groups of PGAPGV / PGA parameters of near-fault pulsed ground motion are summarized.The pulse period of ground motion is extracted, and the characteristics of pulse motion parameters and the relationship between pulse period and other parameters are analyzed.The results show that pulse period has an effect on the amplitude and spectral characteristics of the pulsed ground motion. (2) the response of the base isolated structure under the action of the pulsed ground motion and the non-pulse ground motion is analyzed.The results show that the isolation effect of isolated structures is adversely affected by the impulse ground motion, and the response of the isolated structure is larger than that of the non-pulse ground motion, and the seismic response of the isolated structure is increased by the input of the pulse periods with different velocities.The effect of pulse period on the dynamic response of isolated structure is analyzed. The results show that the pulse period is 1.5 or 3.5 times of the natural vibration period of the structure.The seismic response of isolated structure is obviously increased. (4) the correlation analysis between the characteristic parameters of ground motion and the response index of base isolated structure is carried out, and the influence of each characteristic parameter on the response of the structure is studied.The correlation between the energy density and the response of isolated structures is higher than that of PGV / PGAN PGD / PGV and the response of isolated structures.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU435

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