考虑物理加载时滞的力修正迭代混合试验方法

Here, to improve convergence efficiency of traditional iterative hybrid tests, a force correction iterative hybrid test method considering physical loading time delay was proposed. This method could use numerical substructure and test substructure for full time history data interaction including inner loop control of calculation and loading within time history and iterative convergence control of outer loop between time histories. In inner loop of time history, reaction force of test substructure in numerical integration of equation of motion was corrected with the force correction strategy, and time delay compensation was performed for physical loading displacement command by combining third-order polynomial extrapolation method. In outer loop of time history, combined with the fixed-point iterative algorithm, outer loop iterative convergence controller was established to reduce displacement response error between adjacent two rounds. Taking a three-story frame structure with viscous dampers as an example, the force correction strategy was verified with numerical simulation, and effects of loading time delay on iteration convergence were further analyzed. The results showed that the force correction strategy can effectively improve iterative convergence efficiency, the higher the correction accuracy of reaction force of test substructure, the higher the convergence efficiency; time delay of physical loading has a significant impact on iterative convergence, time delay compensation can effectively improve iterative convergence.