MRD与LRB相混合的结构振动控制

磁流变阻尼器(MRD)利用磁流变液提供可控性是当今最有前途的半主动控制装置,附加MRD是铅芯橡胶垫(LRB)隔震结构的发展方向.因此提出3种MRD与LRB隔震混合方案,建立了MRD与LRB隔震混合结构的动力分析模型,推导出运动微分方程,对其进行时程反应分析.以7层框架结构为例,采用瞬时最优控制算法分别对3种混合方案进行地震反应分析,与LRB隔震结构进行比较,各混合方案的各种地震反应均明显得到更好地控制,而混合方案3的控制效果最显著.

Hybrid Control of MRD and LRB for Structural Vibration

The magnetorhrological damper(MRD) that uses MR fluids to provide controllability is one of the most promising semi-active devices to control structural vibration,which is available to be attached to Lead-Rubber Bearing(LRB) so as to form a base-isolated structure.Three kinds of such hybrid schemes of MRD and LRB were thus proposed with dynamic analysis set up.A kinetic differential equation was derived and a dynamic time history analysis was made.Taking a 7-story frame as example,the seismic response analysis was made for the proposed three kinds of hybrid schemes according to the theory of instantaneous optimal control(IOC) algorithm individually.Compared with the single LRB base-isolated structure,all the three hybrid schemes present clearly the effective controllabilities of seismic response especially the scheme 3.