The Static Analysis Of Steel-concrete Composite Girder Bridge

Steel-concrete composite structure is that steel beams and concrete in closeconnection through shear studs and they can be shared load structure together. Becauseit has convenient construction and good economic returns and good integrity andseismic level advantages，so it has been widely used in the construction. This study isone of the steel-concrete composite structure of a lot of types——open thin-walled steelbox and plate combination of concrete continuous beam bridge. The main work andconclusions are:①Described the steel-concrete composite structure concept, and the developmentprocess as well as the advantages and disadvantages;②Introduced steel-concrete continuous composite beam bridge with a flexibledesign theory and a plasticdesign theory bridge,and what is their force characteristics.Also introduced some measures to reduce the negative moment on the Pier Top;③Using the finite element software Midas/Civil establish6×85m steel-concretecontinuous composite beam bridge overall force by force model to study the mainbridge construction phase and the operational phase of bridge steel box with a concreteslab as well as bridge deflection;④Using the finite element software Midas/Civil simulate construction methods ofsimply supported to continuous variable, and applying longitudinal prestressing method,andchanging the order of pouring a concrete slab, and jacking construction method ofthese four ways. Use the pier negative moment area before and after the concrete slabmeasures compare the forces, whether the measure has come to reduce the negativemoment of the force to improve the concrete slab conclusions;⑤Through the study of thin-walled bar, and seek major fan of the geometriccharacteristics of thin-walled steel box section opening. Bending stress is applied onthin-walled steel box, and the result is generally rod bending stress by comparing thedifference between the two drawn and thin-walled effect rods in practical engineering;⑥Using the finite element software Midas/Fea build five different pitchesdiaphragms, and discussing the impact of different pitches on opening diaphragms steelbox by force.