三维隔震单层球面网壳结构频率相关变阻尼半主动控制

在不同频率特征的地震动作用下,三维隔震单层球面网壳结构隔震层最优阻尼设计不同.文中基于单自由度体系加速度传递率函数,提出一种地震动主频相关的加速度阈值变阻尼半主动控制方法以及地震动主频分区识别方法.基于ABAQUS软件的DLOAD子程序,开展了三维隔震单层球面网壳被动控制与半主动控制有限元计算,对节点加速度、杆件轴力进...

Semi-active control with frequency dependent variable damping for three-dimensional isolated single-layer spherical reticulated shell structure

The optimal damping of the isolation layer is different for the three-dimensional(3D)isolated single-layer spherical reticulated shell structure under ground motions with different frequency characteristics.A ground motion dominant frequency dependent semi-active control with variable damping adjusted based on an acceleration threshold and a method to identify the dominant frequency region are proposed based on the acceleration transfer function of the SDOF system.Passive and semi-active control simulations of a 3D isolated single-layer spherical shell are conducted utilizing the DLOAD subroutine in ABAQUS and the structural acceleration and member axial force responses are analyzed.The results show that the semi-active control of complex structures can be achieved by the DLOAD method.The semi-active control method can quickly identify the dominant frequency of the motion,and gradually adjust the demanded damping with acceleration threshold damping optimization to avoid abrupt change of responses due to the damping switch.The dynamic response of the semi-active control is close to that of the optimal passive control which assumes the ground motion is known in prior.