Abstract

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Title:: Calculation of Ultimate Bearing Capacity of Steel Beam-columns Based on Generalized Yield Line Method

Author(s):: CHEN Yi-yi; HE Ya-wen; College of Civil Engineering, Tongji University

Keywords:: generalized yield line method; H-section; beam-column; local buckling; interactive effect of plate; ultimate bearing capacity

Abstract:: The limit state of plate group bending about strong axis of H-section steel beam-columns was investigated based on generalized yield line method. Reasonable assumptions were chosen to solve the ultimate bearing capacity of the compression flange after buckling. The stress distribution of the cross section under the limit state and influences on plastic status of buckling flange derived from the constraint of circumjacent plates and compactness of the compression flange were discussed. A method denoted as “equivalent load method” was proposed describing the stress distribution of the cross section under the limit state considering interactive effect of buckling plates. On the basis of the review on extended applicability of generalized yield line method compared to classical yield line theory, the existing problems of generalized yield line method were analyzed and feasible solutions were proposed. The calculation results were compared with test results and finite element analysis results. Results show that the ultimate bearing capacity of beam-columns bending about strong axis can be accurately predicted based on generalized yield line method.