Author(s): WANG Wei, YAN Peng, LI Ling, State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Department of Building Engineering, Tongji University
Pages: 119-125
Year: 2014 Issue:  12
Journal: Engineering Mechanics
Keyword:  steel frame; progressive collapse; welded flange-bolted web connection; simplified model; fracture;
Abstract: Based on progressive collapse-behavior test results on a cold-formed RHS column to an H-beam sub-assemblage with a welded flange-bolted web connection, the whole process performance of the joint was reasonably reproduced through high fidelity finite element modeling by using ABAQUS software, including the beam bottom flange fracture under a middle column removal scenario. A simplified joint model was further proposed based on the component method and back-stepping method, which can reflect a force evolving process and discontinuous deformation such as fracture and a post-fracture path with a cost-effective solution.Incorporating this joint model, the dynamic nonlinear progressive collapse analysis was carried out on a five storey by four bay steel frame. It is found that the joint fracture imposes a significant impact on the structural vertical response and sufficient attention should be therefore paid on the behavior evaluation for progressive collapse.