CAJ | 학술논문

在分析普通振动控制系统特点的基础上提出基于负刚度原理减震系统和负刚度阻尼装置的两种实现思路,并详细分析附加负刚度阻尼装置可以显著提高结构的减震效果.首先,利用结构附加刚度比率和附加阻尼比之比作为控制参数,通过理论推导单自由度正、负刚度减震体系的动力放大系数和传导比,讨论控制参数对二者的影响;然后,采用有限单元法分析正、负刚度减震体系结构的地震动力反应,通过结构的自振频率和位移、速度、加速度以及柱底剪力反应的分析,说明负刚度振动控制系统可以减少上部结构绝对加速度.分析表明,负刚度阻尼装置的负刚度可部分抵消原结构的正刚度,降低了结构的自振频率,提高结构阻尼,较大幅度地减少上部结构的动力响应,具有更好的减震性能.
재분석보통진동공제계통특점적기출상제출기우부강도원리감진계통화부강도조니장치적량충실현사로,병상세분석부가부강도조니장치가이현저제고결구적감진효과.수선,이용결구부가강도비솔화부가조니비지비작위공제삼수,통과이론추도단자유도정、부강도감진체계적동력방대계수화전도비,토론공제삼수대이자적영향;연후,채용유한단원법분석정、부강도감진체계결구적지진동력반응,통과결구적자진빈솔화위이、속도、가속도이급주저전력반응적분석,설명부강도진동공제계통가이감소상부결구절대가속도.분석표명,부강도조니장치적부강도가부분저소원결구적정강도,강저료결구적자진빈솔,제고결구조니,교대폭도지감소상부결구적동력향응,구유경호적감진성능.
The seismic reduction system based on negative stiffness principle and two kinds of realizable ideas were presented by analyzing the characteristics of general vibration control systems, and the seismic response reduction effect of the structure attached with negative stiffness damping installations was discussed. Using the rate of supplementary stiffness and the rate of supplementary damping ratio as control parameters, the effects of the dynamic magnification factor and the transmission ratio of single-degree-of-freedom seismic reduction systems with positive and negative stiffness were discussed respectively. The seismic responses of the seismic reduction systems with positive or negative stiffness were analyzed by FEM. On the basis of investigations on natural frequencies, vibration displacement, velocity and acceleration of the structure as well as the shearing force on the columniation, it is shown that the absolute acceleration of the superstructure is decreased. The negative stiffness of the negative stiffness damping installations can counteract the positive stiffness of the structure, reduce the natural frequency, enhance the structural damping, decrease the dynamical responses of the superstructure, and make the structural seismic reduction capability more observable.