设置线性磁流变可控阻尼框架结构的半主动控制分析

Semi-active control analysis of frame structure with linear magnetorheological controllable damping

为研究框架结构地震反应,采用磁流变阻尼器对其进行半主动控制分析.首先使用控制理论建立能同时控制位移、速度和加速度的主动控制方程,并推导了最优控制力,通过算例探讨了框架结构位移、速度和加速度的权函数;然后对设置可控阻尼器的10层框架结构进行地震反应半主动控制分析,研究了结构位移、速度和加速度等地震响应,由此分析可控阻尼器最大和最小阻尼系数对半主动控制的影响.结果表明:应考虑能量消耗合理选择结构控制的各权函数,并应合理设置可控阻尼器最大和最小阻尼系数.算例表明,最小阻尼器系数可取为最大阻尼系数的1/10,以使框架结构获得较优的控制效果.

A semi-active control analysis of the seismic response of the frame structure with magneto rheological dampers was carried out.Control theory may be firstly used to establish an active control equation that can simultaneously control displacement,velocity,and acceleration,and optimal control force is derived,from which the weight functions of displacement,velocity and acceleration of the frame structure through an example can be discussed;then a ten-story frame structure with controllable dampers is analyzed for semi-control of seismic response to research the seismic response of structural displacement,velocity and acceleration,from which the influence of the maximum and minimum damping coefficients of controllable dampers on semi-active control is analyzed.The results show that each weight function of structural control should be selected reasonably in consideration of energy consumption and the maximum and minimum damping coefficients of controllable dampers should be set reasonably,and the engineering example shows that the minimum damper coefficient is 1/10 of the maximum damper coefficient of the controllable damper,so that the frame structure can obtain a better control effect.