Abstract
Based on LS-DYNA and Lagrange-Euler coupling algorithm, the nonlinear dynamic response of T-steel under external explosive loading of condensed explosives was studied with numerical analysis, and the influence of contact state was mainly discussed. The numerical results showed that the damage effect of steel members under contact explosion was stronger than the non-contact explosion; the axial deformation was the biggest at the center and decreased gradually from the center to surrounding area; under contact explosive, there was a displacement platform at the initial stage of the deformation of the nodes at the farther distance from the center; due to the web, under non-contact explosion, the central tangential deformation was the smallest, and the deformation sharply increased firstly and decreased gradually next from the center to nearby nodes.
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