中文摘要：

针对传统控制算法通常难于处理结构控制系统在地震激励下的非线性行为、时变特征和参数不确定性这一难题，提出了一种基于离复位控制策略的直接法，可在相平面上通过网格划分设计控制力，这种控制方法可用于不同的控制系统．同时，通过数值算例分析了一个各层均设有主动拉索控制系统的3层剪切型结构的地震反应控制问题．研究结果表明，直接法的控制效果略优于LQR，而且无需建立控制系统的精确模型就可有效实施控制，验证了它的可行性和有效性．

英文摘要：

Traditional control algorithms have difficulty handling nonlinear behavior of structures, time vari- able features and parameter uncertainties of structural control systems under seismic excitation. A direct method based on the Off-and-Towards-Equilibrium （OTE） strategy was presented in this paper to overcome these difficulties. According to the proposed method, the control force can be designed by dividing the phase plane into mesh regions. Its advantage is that it can be used for a variety of control systems. In order to evalu ate the performance of the method, the seismic performance of a three-storey shear building with an active tendon system Was studied. The results show that the proposed method performs slightly better than the linear quadratic regulator （LQR） algorithm, while possessing several advantages over the LQR controller. Consequently, the feasibility and effectiveness of the proposed method are verified.