Analysis On Behaviors Of Prestressed Steel-concrete Continuous Composite Beam With Partial Corrugated Steel Webs

To tackle problems like low efficiency of Prestressed concrete board and local buckling of steel web in negative moment region of prestressed continuous steel-concrete composite beams,the hybrid design method which replace plane steel webs with corrugated steel webs is adopted in this area.Furthermore,as the prestressed steel-concrete continuous composite beam with partial corrugated steel webs is a new structure,its static performance is also analyzed systematically in this paper.(1)This paper summarizes the calculation method for the overall buckling,local buckling of continuous composite beam and buckling strength of corrugated web.Based on the finite element theory of eigenvalue analysis,this paper analyzes buckling strength and buckling modes of this structure under the different ratio of plate height to thickness,compares the stability ultimate load and the plastic ultimate load,and then verifies the corrugated web buckling strength under the different ratio of plate height to thickness.(2)Based on the theoretical calculation and finite element analysis,this paper investigates the prestressed efficiency,cracking load,bending moment distribution and the distortion of main girder in the uncracked elastic stage.It shows that the hybrid design method can take full advantage of low axial stiffness and ability of anti-buckling of corrugated steel webs,improve prestressed efficiency and delay cracking load in concrete slab.The theoretical calculation result consistent with the that of finite element analysis,which proves that it is qualified for stress and deformation calculation for its high accuracy.(3)This paper makes a bearing capacity analysis of the prestressed steel-concrete continuous composite beam with partial corrugated steel webs,and then a finite element model which analyzes the yield capacity and ultimate bearing capacity of this structure is established to imitate this process,and the theoretical results is compared with that of simplified calculation theory;in the meantime,the steel girder stress distribution,deformation,interface slip are also analyzed in the yield state and ultimate state.Later,a comparison with ordinary steel-concrete composite beams shows that the hybrid design method cannot improve the yield load and ultimate load.(4)This paper analyzes the mechanical properties under different parameter,such as concrete strength,prestressing tendons shape,corrugated web length,corrugated web wave height with the use of infinite element model.In contrast to the flexural bearing capacity,deformation and interface slip property,the optimal model is developed.The results can be used as references for engineering design.