Overall Design of Municipal Long-span Simple-supported Steel-concrete Composite Beam Bridge
Aiming at the simple-supported 60 m long-span steel-concrete composite beam bridge commonly used for the urban viaduct spanning road,the layout of cross-section beam number,the different construction schemes,and the measures to reduce the shrinkage and creep of deck slab are analyzed.The result shows that the economy of few-girder design is better than that of the multi-girder design.But the thickness of top flange slab in the middle of span will increase much.2 temporary branch piers are set up,which can basically realize the effect of steel and concrete jointly bearing the first phase of dead load.Compared with the few-support construction,the integral hoisting is easy for construction,but will greatly increase the amount of steel material.The frequent combination can reduce the 30％axial tensile force of prefabricated concrete deck slab at the storing age for 90 d in the construction without support.
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