The Research Of Structure Mechanical Behavior Based On PC Continuous Frame Girder With Trapezoidal Corrugated Steel Webs

At present,the relevant research at home and abroad mainly focuses on the basic mechanical properties of this structure,such as the overall bending resistance of the structure,the local shear buckling of corrugated steel web,the torsional resistance and the ultimate bearing capacity of thesection.Many full-scale model tests and finite element analysis have alsobeen carried out by relevant scientific research institutions,but most of these studies are aimed at the mechanical analysis of small-span simply supported beams,and the static analysis and dynamic characteristic anal ysis of long-span variablecross-section connected rigid frame bridges are relativelyfew.In order to make up for this deficiency,this paper takes the designof a long-span corrugated steel web PC composite box girder as the background,and the specific research is as follows:(1)By summarizing the relevant structural theoretical kNowledge,master the basic mechanical characteristics of corrugated steel web composite box girder.(2)Based on the engineering background of this paper,on the basisof the original design,a more perfect design scheme of PC continuous rigid frame with corrugated steel web is drawn up,and the design schemeof or dinary PC continuous rigid frame with the same span combination isgiven at the same time.(3)Based on the finite element theory,aiming at the design schemes of continuous rigid frame with corrugated steel web and ordinary PC web,a relatively perfect finite element simulation analysis model in line with the mechanical characteristics of the actual structure is established by fully considering the difference of mechanical properties of each member and the coupling between them.(4)Statically analyze the above two models,co MPare different working conditions,analyze the stress and deformation of each component,focus on the analysis and checking calculation for the weak area and complex stress area of the structure,and put forward some improvement and strengthening measures in combination with the optimization of the structural size and reinforcement of the model.(5)The basic dynamic performance of the above two models is analyzed,including natural vibration eigenvalue analysis and modal analysis,and the mechanical properties of the bridge under moving load are coMPared and analyzed.