Study On The Bending Bearing Capacity Of Corrugated Steel Web Composite Box Girder With Considering The Effect Of Torsion And Distortion

With the development of modern bridges, engineers are increasingly adopting high strength material and composite steel- reinforced concrete composite structure, more and more to be thinner and long-span direction development, and model structure with corrugated steel web box girder by widespread concern. In this paper, we use a combination of theoretical analysis, numerical calculation and finite element model test methods and of box girder with corrugated steel webs considering torsion and distortion of bending bearing capacity were studied. The main research methods and research results are as follows:(1) The solving process of maximum bending capacity of box girder with corrugated steel webs is studied. According to the structure characteristics of box girder with corrugated steel webs, abstracted considering external prestressing after mechanical schema, Ni Ping section is assumed to and there is an ordinary concrete box beam bending beari ng capacity formula derivation method based on, according to the mechanical equilibrium and the stress balance method is corrugated steel web plate of the maximum bending bearing capacity formula.(2) Theoretical analysis of torsion and distortion of box girder with corrugated steel webs. Through the analysis of restrained torsion and distortion stress characteristics and application method of the generalized integral and the generalized coordinates is waveform steel web plate simply supported box beam torsion and distortion angle warpage and stress along the span of the changes in the graph, and analyze with the bending stress ratio, based on the analysis of bending the influence degree of.(3) To establish the finite element model of corrugated steel web plate based on Midas platform. Based on solid element and Midas platform established the finite element model of the box girder with corrugated steel webs, by comparing the finite element and generalized integral analytical method for the restrained torsion and distortion characteristics of the computational results. Finally, confirm each other out the effectiveness of the correctness of the model and analytical method.(4) The formula of maximum bending bearing capacity of corrugated steel web plate considering the factors of primary load and torsional distortion of highway is derived. Based on highway level load, the geometric parameters(height to span ratio) of the composite box girder with corrugated steel webs of dead load and live load bending stress and the effects of live load warping stress, transverse partition in contrast settings and not setting the two diaphragms calculation results found that diaphragm settings to reduction box girder distortion effect and restraint torsion effect, so the diaphragm is effective engineering measures for reducing warping normal stress is analyzed. Finally, the formula of the spacing between the transverse plate and the torsion factor is established, and the solving process of the bending bearing capacity is given.