摘 要：对于大刚度结构试验，采用传统的位移控制加载试验难以进行，为此提出了外环位移控制、内环力控制的混合控制加载方法。在结构上设置外接高精度位移传感器测量位移反应，并设计位移控制器实现结构位移的反馈控制，同时采用一个位移与力转换系数，把位移命令转换为力命令使得加载设备采用力控制加载模式工作。为了验证该方法的有效性，首先介绍该方法的原理，然后进行数值模拟与试验验证。数值模拟和试验结果都表明，当选用合理的控制器参数时，该方法具有非常好的稳定性和精度，要优于传统拟动力试验方法，并且可以实现小位移的精确加载和测量，试验结果更准确。同时该方法中的内环采用力控制要比采用位移控制得到的试验结果更精确。研究表明，该方法可以很好地完成大刚度结构的拟动力试验。

Abstract: This paper presents a new pseudo-dynamic testing method that is controlled by displacement outer loop and force inner loop for structures with large stiffness. In particular, the displacement of the specimen measured by LVDT was controlled by a displacement feedback controller, and a parameter was used to transfer the displacement command to force command, then the actuator can work in a force-control mode. The principle of the proposed method was first introduced, followed by numerical and test validation of this new method to further prove its effectiveness. The numerical and test results show that this method exhibits excellent performance in terms of stability and accuracy if proper controller parameters are adopted. The small displacement loading and its measurement can be precisely achieved by using this new method, which is found to be superior to conventional pseudo-dynamic (PSD) tests method. In addition, the test results obtained by force-controlled method in the inner control loop are more accurate than those by displacement-controlled method. It shows that this method can be successfully used for pseudo-dynamic tests of the structures with large stiffness.