Effect Of Joint Mode On Stress Analysis Of Hybrid Continuous Beam Bridge

Composite- concrete hybrid continuous beam bridge is new hybrid girder bridge. Its side spans and extend midspan a portion is prestressed concrete beam. Its intermediate part of midspan is steel- concrete composite beam. This hybrid continuous beam bridge enhanced the bridge spanning capacity, and improved the stress characteristics of the structure. Its stiffness of the structure transited more smoothly, makes traffic more smooth and comfortable. It has many advantages, such as bearing capacity reliability, convenient construction, small mid-span deflection etc. It has the remarkable social and economic benefits, and will become an important development direction of bridge architecture.The paper takes the three span prestressed concrete continuous beam bridge as the background, changing the original bridge intermediate 50 m of main span of 150 m concrete beam to steel-concrete composite beam structure, which come into being hybrid continuous beam bridge. Using finite element software MIDAS CIVIL established the whole bridge finite element model of new structure, and carried out construction stage and operation stage analysis. It is difficult to simulate accurately three kinds of steel-concrete composite segment joint model, anterior bearing-plate, anterior rear bearing-plate and rear bearing-plate in the midas civil,so the joint model simulation analysis was analyzed by the finite element software ANSYS.In this paper, the main content of the work is:(1) Summarize steel-concrete hybrid beam bridge different joint structural forms, the advantages and disadvantages etc.(2)Sums up different connections between steel and concrete structure forms, stress characteristics etc.(3)Drafted a new design scheme of Composite- concrete hybrid continuous beam bridge and joint structure.(4)Using MIDAS CIVIL to establish the whole bridge model of new hybrid continuous beam bridge, analysis calculation on the stage of construction and operation, and get a set of joint section internal force value.(5)Using ANSYS to establish three kinds of different bearing plate structure form, namely anterior bearing-plate, anterior rear bearing-plate and rear bearing-plate joint local finite element model. Make joint section internal force keep consistent with joint section internal force joint of MIDAS CIVIL model. Analyzed joint section stress state in the three joint,the force transmission effect of PBL plate and the stress rules and puts forward the simplified calculation method of PBL plate shear.