摘要
提出了一种轨道式负刚度控制系统。该系统由轨道式负刚度装置和新型SMA阻尼器构成,能够在模拟结构屈服的同时控制位移响应。根据负刚度控制系统的性能特点,从控制效果角度提出了优化目标函数,建立了优化数学模型。该目标函数考虑了4个关键的结构控制指标,为了便于权衡不同指标,分别取其在受控工况和无控工况下数值之比,然后分别计算每个比值在Benchmark问题给出的7条地震激励下的平均值。考虑优化参数较少且主次之分明显,采用分层序列法进行优化。针对隔震的Benchmark楼房模型进行了轨道式负刚度控制系统的优化设计。优化结果兼顾了对基底剪力和基底位移的控制效果,同时对层间位移和楼层加速度也有较好的控制效果,实现了目标函数最小化。
A rail-type negative stiffness control system is developed. The control system consists of a rail-type negative stiffness device( NSD) and a novel SMA damper,so it can mimic yielding of the global system while limiting displacement response. Optimization objective function is put forward by considering control effect and mathematical model is established according to the characteristic of the negative stiffness control system. Four important structural control indices are considered in the proposed objective function. The ratio of the controlled indice over uncontrolled indice are used in order to weigh different indicators. Mean value of each ratio under the seven earthquake excitations given by the Benchmark problem is calculated. Considering there are only two parameters need to be optimized,and there is a clear distinction between the primary and the secondary,Hierarchical sequence method is employed. Optimum design of rail-type negative stiffness control system is performed for smart base isolated Benchmark building. Optimization result strike a balance between the control result of base shear and base displacement.Meanwhile,story drift and floor acceleration are under effective control,and minimization of the objective function is achieved.
作者
李宏男
孙彤
LI Hongnan;SUN Tong(Dept. of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China;Dept. of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168,China)
出处
《地震工程与工程振动》
CSCD
北大核心
2018年第1期21-27,共7页
Earthquake Engineering and Engineering Dynamics
基金
国家自然科学基金项目(51261120375)
辽宁省高等学校基本科研项目(LJZ2017040)~~
