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研究了考虑土-结构相互作用下桥梁结构的MRD半主动震动控制.将桥梁结构简化成14自由度模型,作动器布置在桥台和主梁之间.采用子结构方法考虑土-结构之间的相互作用.为简化计算,地基阻抗函数采用与激励频率无关的时域阻抗函数.分别用LQR和H_∞控制算法控制桥梁结构的响应.研究表明:在场地土较弱时,土-结构相互作用明显改变结构的动力特性,对桥梁结构的MRD半主动控制的控制效果有重要的影响;控制理论设计的控制器更具有鲁棒性,在剪切波速较大时,控制效果和LQR半主动控制接近;在剪切波速较小时,仍然对桥梁结构有控制效果,而LQR半主动控制的控制效果变差,甚至是增大结构的响应.
The MRD semi-active vibration control considering the bridge structure under the soil-structure interaction is studied. The bridge structure is simplified into a 14-DOF model and the actuator is arranged between the abutment and the main girder. The sub-structure method is used to consider the soil- In order to simplify the calculation, the ground-based impedance function uses the time-domain impedance function independent of the excitation frequency.The LQR and H_∞ control algorithms are respectively used to control the response of the bridge structure.The results show that when the site soil is weak, the soil-structure The interaction between the two structures significantly changes the dynamic characteristics of the structure, which has an important effect on the control effect of the MRD semi-active control of the bridge structure. The controller designed by the control theory is more robust. When the shear wave velocity is large, the control effect and LQR half The active control approach is close. When the shear wave velocity is small, the bridge structure is still controlled. However, the control effect of the LQR semi-active control becomes worse, and even the structure response is increased.