位移相关摩擦阻尼器在隔震结构中的应用研究

发布时间：2018-03-21 00:05

本文选题：基础隔震　切入点：位移相关摩擦阻尼器　出处：《武汉理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：目前基础隔震在建筑抗震技术中已经发展的较为成熟了,并且相应标准和规范的出台都标志着隔震技术进入了实用性的阶段,但是,当前大多数的基础隔震研究都是针对常规地震记录的,对近断层地震记录下基础隔震的研究较少,考虑到位移相关摩擦阻尼器在橡胶隔震结构应用的空白,提出一种新型的摩擦阻尼器,通过理论分析与数值计算,研究了安装该摩擦阻尼器的隔震结构在不同类型地震作用下的抗震性能。本文的研究内容主要有以下三个方面:(1)本文首先提出了一种新型的位移相关摩擦阻尼器,并建立该阻尼器的力学模型,而橡胶隔震支座则采用了经典的Bouc-Wen微分滞回模型,根据橡胶隔震支座与摩擦阻尼器的力学模型,建立了一个两自由度体系的动力方程,接着用谐波平衡法求出该方程在正弦波荷载作用下的解析解,再用经典的Runge-Kutta法求出该方程的数值解,通过数值解来验证解析解的正确性。另外还研究摩擦阻尼器的三个参数(初始压缩量、弹簧刚度、坡面夹角)变化时,对方程解析解与数值解吻合效果的影响。最后用Runge-Kutta法计算出安装了摩擦阻尼器的隔震结构在常规强震记录下的结构响应。(2)以一个安装了隔震层的剪切型五层框架为例,建立安装了摩擦阻尼器的隔震结构的动力方程,然后选取合适的地震波记录(常规地震波、人工合成的近断层脉冲型地震波、实际的近断层脉冲型地震波),人工合成的地震波模拟方法是以常规地震波为底波,再用Dicleili的等效脉冲运动与底波进行叠加。最后研究了有、无安装了摩擦阻尼器的隔震结构在各类地震作用下的地震响应,分析安装了摩擦阻尼器之后结构地震响应的控制效果,数值计算结果表示安装了摩擦阻尼器的隔震结构对地震位移响应的控制良好。(3)依旧以一个安装了隔震层的五层框架为例,建立框架结构的动力方程。研究常规地震波与近断层地震波分别作用时结构地震能量时程曲线的区别,还研究了在常规地震波与真实的近断层地震波作用下,有、无安装摩擦阻尼器的隔震结构在各类地震作用下的能量时程曲线,结果显示,没有安装摩擦阻尼器时,地震输入的能量几乎都是由橡胶隔震支座消耗掉的,而安装了摩擦阻尼器之后,地震输入的能量是由隔震支座与摩擦阻尼器共同消耗掉的,并且从侧面证明了摩擦阻尼器对隔震结构的位移响应的控制良好。
[Abstract]:At present, the foundation isolation technology has been developed more mature in the building seismic technology, and the corresponding standards and specifications have indicated that the isolation technology has entered a practical stage, but, At present, most of the research on foundation isolation is aimed at conventional seismic records, but the research on foundation isolation under near-fault seismic records is less, considering the blank of the application of displacement-related friction dampers in rubber isolated structures. A new type of friction damper is proposed, which is theoretically analyzed and numerically calculated. In this paper, the seismic performance of the isolated structures with the friction dampers under different types of earthquakes is studied. The main contents of this paper are as follows: (1) in this paper, a new type of displacement-dependent friction dampers is proposed. The mechanical model of the damper is established, while the classical Bouc-Wen differential hysteresis model is used in the rubber isolation support. According to the mechanical model of the rubber isolation support and the friction damper, the dynamic equation of a two-degree-of-freedom system is established. Then the analytical solution of the equation under sine wave load is obtained by harmonic balance method, and the numerical solution of the equation is obtained by the classical Runge-Kutta method. The correctness of the analytical solution is verified by numerical solution. In addition, the variation of three parameters (initial compression, spring stiffness, angle between slope surface) of friction damper is also studied. Finally, using Runge-Kutta method to calculate the structural response of the isolated structure with friction dampers under the conventional strong earthquake record, taking a shear five-story frame with a isolation layer as an example, the effect on the agreement between the analytical solution of the equation and the numerical solution is obtained. The dynamic equations of isolated structures with friction dampers are established, and the appropriate seismic wave records (conventional seismic wave, synthetic near-fault pulse seismic wave) are selected. In the actual near-fault pulse type seismic wave, the synthetic seismic wave simulation method is to use conventional seismic wave as the base wave, and then use the equivalent pulse motion of Dicleili to stack with the bottom wave. The seismic response of isolated structures without friction dampers under various kinds of earthquake action is analyzed, and the control effect of seismic responses of structures with friction dampers is analyzed. The numerical results show that the seismic displacement response of the isolated structure with friction dampers is well controlled. The dynamic equation of frame structure is established. The difference of seismic energy time-history curve between conventional seismic wave and near-fault seismic wave is studied. In addition, under the action of conventional seismic wave and real near-fault seismic wave, there are, The energy time-history curves of the isolated structures without friction dampers under various kinds of earthquake action show that the energy input from the earthquake is almost consumed by the rubber isolation bearings when the friction dampers are not installed. After the friction damper is installed, the energy input from the earthquake is consumed by the isolation support and the friction damper, and it is proved from the side that the friction damper can control the displacement response of the isolated structure well.
【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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