上下盘效应对摩擦滑移隔震结构动力响应影响

Dynamicresponse analysis of the friction-slip isolation structure due to hanging wall/foot wall effects

将U型带片作为限位消能元件,以硫化钼(MoS_(2))涂层材料作为摩擦材料,形成摩擦滑移隔震装置。建立一栋5层带有限位装置的滑移隔震结构计算模型,输入上盘地震动和下盘地震动,研究带有限位装置的滑移隔震结构在上下盘地震动调幅前后结构动力响应(楼层加速度、层间位移及层间剪力)的变化规律,分析结果表明,调幅前后下盘地震动作用下的动力响应均大于上盘地震动作用下的动力响应;下盘地震动作用下的结构动力响应受到加速度峰值调幅的影响较大;调幅后上盘地震动作用下的楼层加速度、层间剪力有所减小,但减小的幅度并不明显。

U-shaped steel plate is used as sliding-limited and energy-absorbed element and coating material molybdenum sulfide(MoS_(2))is used as the friction material to compose the friction sliding isolation device.Taking a 5-layer sliding isolation structure as the research object,the hanging wall ground motion and the footwall ground motion were input,the dynamic responses(acceleration,interlayer displacement and interlayer shearing force)of the sliding isolation structure with displacement limit device when the PGA of hanging wall ground motion and footwall ground motion were scaled/unscaled were analyzed by SAP2000.Analysis results show that the dynamic response under footwall ground motion is greater than those under footwall ground motion when the PGA of earthquake was scaled/unscaled.The dynamic response of the structure under footwall ground motion is greatly affected by scaling of the PGA of earthquake,the floor acceleration and interlayer shearing force are reduced if the PGA of hanging wall ground motion is scaled,but the decreasing amplitude is not obvious.