Research On Hybrid Simulation Test Method Of Cable-tower Structure

As an important method of seismic test,the hybrid simulation test method has good operability,high accuracy,and low cost.These advantages make it widely used in seismic test methods.At present,the hybrid test method mostly takes plane frame structure as the research object.This research takes the space cable-tower structure in the bridge as the research object,which is more complex than the plane frame structure.At the same time,it adopts multi-degree-of-freedom and multi-actuator control,and conducts a hybrid test method through the interaction of force and displacement between the cable-tower structure..Due to the unavoidable time lag in the loading system of the hybrid test,the actuator cannot accurately apply the displacement,which in turn leads to inaccurate calculation results.At the same time,for numerical substructures,the relatively slow finite element calculation speed will also cause a large Therefore,for the hybrid simulation test,eliminating the time delay to meet the real-time requirements has become an urgent problem to be solved in the hybrid test method.(1)First,this paper is based on software programming,based on the finite element method,theoretical derivation and programming to establish a bridge cabletower structure model in the calculation program,and solve the response under various excitations.This method is faster than finite element calculation.,which can effectively reduce the influence of time delay in the calculation process,and verified by finite element software,which proves the correctness of the calculation of this method.(2)Secondly,based on the Simulink platform,this paper builds a model of the entire process of the hybrid simulation test,and simulates the hybrid test process through the interaction of the numerical substructure and the test substructure.The simulation results of this hybrid test model and the pure numerical model are compared under different working conditions,and the errors of the two are within 5%,which proves the correctness of this hybrid test method.(3)Finally,the real-time research of the hybrid simulation model is carried out in this paper,and the time delay compensation method is used to compensate.The results prove that the spatial structure model is used in the multi-degree-of-freedom excitation single-actuator and multi-actuator control conditions.It still meets the realtime requirements.