Mechanical Properties And Experimental Study Of Girders With Large-size Corrugated Steel Webs

The prestressed concrete composite girder bridge with corrugated steel webs is a new type of bridge structure with corrugated steel web instead of concrete web.It has been widely used in recent years at home and abroad.In this paper,the bearing capacity of beams subjected to the local in-plane compressive load,the elastic shear buckling strength and ultimate shear bearing capacity calculation methods for corrugated steel webs were analysed and studied.Based on mechanical characteristics of beams subjected to the local in-plane compressive load and combined with the existing research results,its local pressure failure mode and bearing capacity calculation formula are summarized.Five H-shaped steel beams with different longitudinal stiffeners were conducted static experiment.The test proved that the local compression failure mode of the test piece is the yield of the steel web,which shows that the web yields from the loading center to the two sides in turn.The plastic characteristics are obvious during the failure.Type 2000 and type 2400 large-sized corrugated steel webs and type 1600 corrugated steel webs have little difference in local compression bearing capacity.Setting stiffeners in the mid-span can increase the ultimate bearing capacity of the test piece.The web height has little effect on the ultimate bearing capacity of the test piece.At the same time,the finite element simulation can better simulate the stress process and failure phenomenon of the test piece.Web thickness,flange thickness,and stiffener thickness have a direct impact on bearing capacity.Finally,the expression of the local compression bearing capacity of the Hshaped steel beam with large-scale corrugated webs is proposed,and the calculated value of the formula is compared with the experimental and finite element results.The results show that the formula proposed in this paper has good accuracy.Based on shear buckling performance of H-shaped steel beams with corrugated steel webs and existing research results,the shear buckling failure mode and the elastic shear buckling strength calculation method were Summarized.A reliable finite element model for elastic shear buckling analysis of corrugated steel webs was established.Based on this model,the influence of factors such as the web height and web thickness of the corrugated steel web on its elastic shear buckling performance was studied.Based on the numerical results of the finite element analysis of the elastic shear buckling of corrugated steel webs,the theoretical calculation formulas of local elastic shear buckling strength,combined elastic shear buckling strength,and overall elastic shear buckling strength for 2000 type corrugated steel webs were revised.One H-shaped steel beams with different longitudinal stiffeners were conducted static experiment.A finite element model for elastoplastic shear buckling analysis of corrugated steel web beams is established.Based on a large number of eigenvalue buckling analysis and nonlinear buckling analysis results,the shear strength design curve of corrugated steel web is obtained,and the shear design method of corrugated steel web is given.