Analysis on the deflection of fixed composite beam with corrugated steel webs considering the effect of shear deformation

Abstract

Composite beam with corrugated steel webs are widely used because of their excellent properties.Although the research on deflection calculation of composite beam with corrugated steel webs which is one of the focuses of its research in China has made great progress in recent years,but only statically determinate structures are considered,and the widely use of statically indeterminate structures with fixed ends in bridge engineering.In order to discuss the deflection of fixed composite beam with corrugated steel webs and provide theoretical basis and guidance for follow-up study,this paper assumes that joint stiffness is large enough,the composite beam with corrugated steel webs will be simplified as two fixed ends or one end fixed and the other hinged,considering the influence of slip and web shear deformation,the corresponding formula of midspan deflection is derived.It is hoped that the deflection calculation method suitable for the actual bridge type will be found step by step.Based on test beam and finite element model,the formula in this paper is verified.The results show that:the proportion of additional slip deflection of composite beams with corrugated steel webs fixed at the ends varies linearly with shear stiffness,which is significantly different from that of parabolic pattern of beams with simply supported ends.The asymmetrical support magnifies the shear deformation and slip effect of composite beams with corrugated steel webs.

Keywords

composite beam with corrugated steel webs / interface slip effect / shear deformation / deflection