Dynamic Effects on a Pre-Stressed Multi-Story Plane Steel Frame Caused by Sudden Failure of a Cable
The dynamic effects on a pre-stressed multi-story steel plane frame caused by sudden failure of a pre-stressed cable were investigated by general finite element software. The stiffness reduction method was adopted to simulate sudden cable rupture, which can induce dynamic response of the pre-stressed multi-story plane frame. The numerical results show that the recommended failure time should be less than 1/20 of the fundamental period of the remaining structure to consider dynamic effects more accurately. As the failure time decreases, the amplitudes of structural top lateral displacement and internal forces at the column ends all increase and they decay more slowly. The dynamic coefficients of bending moment and shear force are larger than that of axial force at the column ends. The farther the beam is from the failed cable, the faster the bending moment at the beam end decays, and the larger its dynamic coefficient is.