张弦梁结构连续性倒塌数值模拟

Numerical analysis on structural response, progressive collapse process and collapse mechanism of beam string structures were carried out via explicit dynamic nonlinear program ANSYS/LS-DYNA. The numerical simulation results show that when an initial failure occurs in one piece of cable, the whole cable and all struts will lose effectiveness. Residual structure resist external loads depend on arch mechanism if there is sufficient lateral stiffness on the supports.Otherwise, residual structure will resist external loads only depend on beam bending mechanism which has little anti-collapse capacity.