| The PC composite box girders with corrugated steel webs use corrugated steel plates to replace traditional concrete webs.This kind of box girder which has a clear mechanical behavior is a light weight and aesthetical structure,and can avoid the cracking of the webs.With the increase of span,its technical and economic advantages are becoming more and more obvious.In recent years,the construction of large span variable cross-section composite box girder with corrugated steel webs has been developed rapidly,which has a good application prospect.In this paper,the transverse force of the deck is analyzed by the elastic frame analysis method based on the effective distribution width and the distortion transverse force theory.Combined with the actual bridge case,the maximum transverse tensile stress of the control sections and their variation along the longitudinal direction are studied.The influence factors of transverse force of bridge deck are discussed by finite element method,the main research work is as follows:(1)The development,structure and structural characteristics of the composite box girders with corrugated steel webs are systematically described.At the same time,the research and application of the composite box girders with corrugated steel webs at home and abroad are described,and the research present situation and the calculation methods of transverse force of the composite box girders with corrugated steel webs are introduced.(2)The elastic frame analysis method based on the effective distribution width and the distortion transverse force of the bridge deck are analyzed,and through the comparison of the solid finite element method,the applicability of the elastic frame analysis method and the distortion transverse force theory are verified.(3)The finite element model of the whole bridge is established based on general finite element software ANSYS.According to the influence lines of transverse stress of the control sections in the solid finite element model,the most unfavorable load is applied to the two models,the maximum transverse tensile stress of the control sections and the law of variation along the longitudinal direction are analyzed,and the calculation results of the two models are compared.(4)The influence of parameters such as structural system,web stiffness,web wave shape,roof thickness,web plate spacing,box section form and diaphragm spacing on the transverse force of bridge deck is analyzed by finite element method,and the main factors affecting the transverse force of the bridge deck are obtained.(5)When diaphragm spacing is bigger,according to the comparison of the elastic frame method and the finite element method,a reasonable method is proposed to correct the transverse stress of mid-span sections of top plates basing on the elastic frame analysis method.Through a large number of finite element calculation comparison,the estimated ratio of the transverse stress of mid-span sections of top plates between the spacing of the diaphragm is smaller and bigger is proposed.(6)Through theoretical analysis,the transverse temperature stress of the bridge deck under nonlinear temperature is studied,the calculation formulas of the self-restrained temperature stress and the frame-constraint temperature stress are deduced,and the main influencing factors of the frame-constraint temperature stress are discussed. |
