NES减震RC框架结构抗震性能研究

Research on seismic performance of NES shock RC frame structure

阐述了NES减震器的动力学原理和减震机理,确定NES减震器的频率和最优振子质量等参数。采用ABAQUS有限元软件对一栋安装NES减震器的5层框架结构进行有限元模拟分析,选取El-Centro波和卧龙波,分析其在不同地震波、不同震级、不同峰值加速度下的破坏形态、动力特性、动力响应及其变化规律。并对减震前后结构的动力反应进行对比。结果表明:NES减震系统可以大幅度减小结构的地震反应,降低结构在地震作用下的加速度响应,减小结构层间位移、增大结构的自振周期;并且NES安装位置越高,结构减震效果越好;同时NES的使用能使按7度抗震设防烈度设计的结构达到8度抗震设防的能力,降低工程造价。

The dynamic principle and damping mechanism of NES shock absorber are presented,the frequency of NES shock absorber and the quality of optimal oscillator is determined.The finite element simulation analysis of a five-story frame structure with NES shock absorbers is carried out by using ABAQUS finite element software.El Centro wave and Wolong wave are selected to analyze the failure modes and dynamics characteristics,dynamic response and its changing laws under different seismic waves,different magnitudes and different peak accelerations.The dynamic response of the structure before and after shock absorption is compared.The results show that:the NES interlaminar damping system can greatly reduce the seismic response of the structure,reduce the acceleration response of the structure under earthquake action,reduce the displacement between structural layers and increase the natural vibration period of the structure;the higher the NES installation position,the better the structure damping effect;at the same time,the use of NES can make the structure designed according to the seismic fortification intensity of seven degress to achieve the seismic fortification capacity of eight degress and reduce the construction cost.