Numerical investigation of inelastic buckling of steel–concrete composite beams prestressed with external tendons

摘要: The ultimate resistance of a continuous composite beam is governed by either distortional lateral buckling or local buckling, an interactive mode the two which sharply different from torsional in bare steel beam. A finite element model developed and based on proposed FE model, inelastic analysis beams negative bending investigated, considering initial geometric imperfection residual stress patterns results are found agree well with test results. Parametrical carried out prestressed external tendons bending. Factors that influence load carrying performance moment analyzed, such as imperfection, beams, force ratio, defined extent prestressing reinforcement slenderness ratios web, flange, beams. By varying cross-section parameters, 25 groups under uniform ratios, 200 total studied means method. computed drawn against modified authors compared Chinese Codified column design curve. It demonstrated tentative method curve can be used assessment strength term defined.