Numerical modelling of concrete-filled steel box columns incorporating high strength materials

摘要: Abstract In this paper, an accurate finite element model which accounts for the effects of initial local imperfections and residual stresses is developed nonlinear analysis high strength steel box columns infilled with concrete. The inelastic behaviour concrete core modelled using elastic–plastic linear hardening a damaged plasticity model, respectively. addition, extensive numerical based on wide range width-to-thickness ratios, yield tubes compressive strengths was also carried out to propose new empirical equation estimating confining pressure predictions ultimate strengths, failure modes are compared experimental results verify accuracy present model. Parameter studies indicate that both Eurocode EC4 Australian Standard AS 5100 approaches can be safely extended predict concrete-filled materials.