摘要
由于高层建筑自身的加速度放大效应,地震作用下其顶部加速度反应易超出相关规范的限值。过大的加速度反应不仅会造成建筑内物品损坏,同时严重影响居住舒适性。为研究高层建筑顶部加速度特性及相应的控制策略,针对设置消能伸臂体系的高层建筑结构,首先根据欧拉梁理论建立结构在地震激励下的振动方程;然后基于随机地震响应分析阻尼器刚度系数和阻尼系数对结构顶部响应的影响;最后运用考虑加速度影响的LQR-accel算法对结构进行主动控制分析。结果表明:以控制顶部加速度响应为目标时,阻尼器存在最优阻尼系数,其刚度系数则越小越有利,结构顶部加速度的降低幅度约为30%;主动控制可以大幅降低体系顶部加速度响应,但是最优主动控制力中被动力占比不高,仅为55.64%。
Under the action of earthquake,the acceleration at the top of high-rise buildings is easy to exceed the standard due to its own acceleration amplification effect.The excessive acceleration may cause damage to the items in the building and seriously affect the comfort of living.In order to study the characteristics of acceleration at the top of high-rise buildings and the corresponding control strategies,research works were carried out on the high-rise building structures with damped-outrigger system.Firstly,the vibration equation of system under earthquake excitation was established based on Euler beam theory.Then,the influence of the damper stiffness coefficient and damping coefficient on the response at the top of the structure under earthquake was discussed based on the random seismic response.Finally,the LQR-accel algorithm considering the influence of acceleration was used to carry out active control analysis of the structure.The results show that there is only an optimal damping coefficient for reducing the acceleration response at the top of the structure.The smaller the stiffness coefficient is,the more effective it is.The optimal parameters can reduce the acceleration by about 30%.The active control can significantly reduce the acceleration response at the top of the structure,but the passive force accounts for a medium part of the optimal active control force,which is only 55.64%.
作者
刘裕禄
魏树利
王建
LIU Yulu;WEI Shuli;WANG Jian(School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China;Key Lab of Structures Dynamic Behavior and Control of China Ministry of Education,Harbin Institute of Technology,Harbin 150090,China;School of Civil and Environment Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2020年第S02期86-95,共10页
Journal of Building Structures
基金
国家自然科学基金项目(51678210)
