三维隔震单层球面网壳结构频率相关变阻尼半主动控制  

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

作　　者：石运东 韦鑫 丁阳[2] 王涛[1] SHI Yundong;WEI Xin;DING Yang;WANG Tao(Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;School of Civil Engineering,Tianjin University,Tianjin 300350,China)

机构地区：[1]中国地震局工程力学研究所,中国地震局地震工程与工程振动重点实验室,黑龙江哈尔滨150080 [2]天津大学建筑工程学院,天津300350

出　　处：《地震工程与工程振动》2022年第1期143-153,共11页Earthquake Engineering and Engineering Dynamics

基　　金：中国地震局工程力学研究所基本科研业务费专项资助项目(2019EEEVL0302,2018D14);土木工程防灾国家重点实验室开放基金项目(SLDRCE18-03);国家自然科学基金项目(51978463);国家重点研发计划项目(2018YFC1504304)。

摘　　要：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、杆件轴力进行了分析。结果表明,DLOAD子程序模拟方法可实现大型工程结构的复杂半主动控制有限元模拟。频率相关加速度阈值变阻尼半主动控制方法可对地震动频率特征快速检测,控制最优阻尼缓慢变化,避免由于阻尼切换造成的结构动力响应的突增现象,对节点加速度以及杆件轴力的控制效果均接近理想最优被动控制。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.

关 键 词：三维隔震 单层球面网壳 地震动主频 半主动控制 最优被动控制 

分 类 号：TU352.1[建筑科学—结构工程]