用于近断层区结构隔震的摩擦摆系统

发布时间：2018-04-14 01:08

本文选题：摩擦摆系统 + 地震隔震　；参考：《北京交通大学》2017年硕士论文

【摘要】：摩擦摆系统是一种滑动支座,它利用球凹面提供恢复力和摩擦力来耗散地震的能量。近断层地震激励会使摩擦摆产生的较大滑动位移,这不仅会使得摩擦摆本身表现出非线性动力学行为,而且其水平位移还与近断层竖向地震动加速度相关。本文旨在从理论上探讨这些问题,主要的工作和结论如下:1.提出了摩擦摆—单自由度结构系统以及摩擦摆—多自由度结构系统的整合模型,并分别编制了这些模型的计算程序。通过与SAP2000软件在远场地震激励的计算结果进行对比,验证了本文程序的可靠性;2.摩擦摆用于单自由度结构系统和多自由度结构系统隔震分析结果均表明,在计算近断层地震激励下摩擦摆基础隔震结构的地震反应时,竖向地震动的影响是不可忽略的;3.基于地震反应谱分析,对摩擦摆的参数进行了分析。建议在近断层区摩擦摆隔震结构系统初步设计时,球凹面滑道半径可取1.5m,滑块与滑道间摩擦系数取0.05;4.摩擦摆用于多自由度结构的减震分析分析表明:经恰当设计,摩擦摆系统可有效地降低结构的层间位移和楼层的绝对加速度;还可有效地缓解因结构水平刚度沿竖向分布不均而导致各楼层地震反应分布不均的现象;5.近断层地震情况下摩擦摆的位移需求很大,因此设计时需确保支座滑块在滑道内有足够的滑动空间。
[Abstract]:Friction pendulum system is a kind of sliding bearing, which uses spherical concave surface to provide restoring force and friction force to dissipate seismic energy.The near fault seismic excitation will cause a large sliding displacement of the friction pendulum, which not only makes the friction pendulum show nonlinear dynamic behavior, but also its horizontal displacement is related to the acceleration of the vertical ground motion near the fault.The purpose of this paper is to discuss these problems theoretically. The main work and conclusions are as follows: 1.The integrated models of friction pendulum single degree of freedom structure system and friction pendulum multi degree of freedom structure system are put forward and the calculation programs of these models are worked out respectively.The reliability of this program is verified by comparing with the calculation results of far field seismic excitation by SAP2000 software.The results of isolation analysis of single and multi-degree-of-freedom structures with friction pendulum show that the effect of vertical ground motion on seismic response of isolated structures based on friction pendulum under near-fault earthquake excitation can not be ignored.Based on seismic response spectrum analysis, the parameters of friction pendulum are analyzed.It is suggested that the radius of the spherical concave slide track should be 1.5 m and the friction coefficient between the slider and the slide track should be 0.05 ~ 4 when the system of frictional pendulum isolation structure is preliminarily designed in the near fault area.The analysis and analysis of friction pendulum used in multi-degree-of-freedom structure show that the friction pendulum system can effectively reduce the floor displacement and the absolute acceleration of the structure.It can also effectively alleviate the phenomenon of uneven distribution of seismic response of each floor due to the uneven distribution of horizontal stiffness along the vertical direction.The displacement requirement of friction pendulum in near-fault earthquake is very large, so it is necessary to make sure that there is enough sliding space for bearing slider in the slide track.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU352.12

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