Stress distribution and shear lag effect of composite steel plate girder bridges based on spatial fine mesh elements

Purpose (1) The shear lag effect and its additional deflection contribution to composite beams based on spatial grid elements were presented. (2) A refined spatial grid element analysis method that can simultaneously obtain the internal forces, displacements and stresses of various parts of a composite beam. Design/methodology/approach A refined spatial grid element analysis method. Findings The proposed method can directly obtain the internal forces and displacements of the joints of the composite beam roof, floor and web. Originality/value To comprehensively comprehend the mechanical behavior of double-girder steel plate composite girder bridge structures and facilitate refined analysis, this paper introduces a refined spatial grid element analysis model applicable to both the global and local domains.