Calculation of the shock response spectrum of the prestressed steel cable

The abrupt fracture of prestressed steel strand will form a great unloading impact force, which will influence the displacement and internal force of the remaining structure. Shock response spectrum method can reduce the computation and ensure the accuracy. In order to obtain the shock response spectrum of the steel strand at the moment of failure, this paper proposes to solve the dynamic response of a single degree of freedom structure after cable break through programming under the premise of knowing the failure time of the strand and the corresponding cable tensioning. We select several unloading curves that are the closest to the test, and solve the response spectrum of the broken cable under different failure time and damping, finally, the response spectrum method is compared with the finite element method by numerical simulation. It can be found that the dynamic coefficient will show different trends due to the change of unloading methods. In the same unloading method, the failure time has little impact on the shock response spectrum, but the impact of damping on the shock response spectrum is very obvious.