Explicit Finite Element Collapse Analysis of Framed Steel Structures by the Adaptively Shifted Integration Technique

摘要

The adaptively shifted integration (ASI) technique is applied to the explicit finite element analy- sis of dynamic collapse behaviors of impulsively loaded framed structures. In the present study, the linear Timoshenko beam element is employed, considering the effect of large deformation by the total Lagrangian approach. Numerical studies are conducted for several impact problems. The obtained solutions are compared with the conventional finite element solutions to discuss the validity of the ASI technique in the explicit large deformation analysis. In some of the examples, the folding behaviors of axially crushed members in the framed strucure are approximated by the rigid-plastic solutions for the mean crushing load to attain higher computational efficiency.