Abstract

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Title:: Research on Continuous Transformation and Reinforcement for Old Simply Supported Hollow Slab Bridge

Author(s):: WEI Jian-gang; HUANG Lei; LI Pei-yuan; WU Qing-xiong; School of Civil Engineering, Fuzhou University

Keywords:: bridge engineering; old simply supported hollow slab bridge; reinforcement; transformation; shrinkage; creep

Abstract:: In order to improve bearing capacity and safety margin of the old simply supported hollow slab bridge in service, the authors applied the system transformation thought that was used in the construction of transforming a simply supported bridge structure into a continuous one to the reinforcement of the old simply supported hollow slab bridge in service, and put forward a method that could reinforce the old bridge and improve their bearing capacity of simply supported continuous transformation. Meanwhile, the implementation method of this reinforced technology was introduced. The effect of load, shrinkage and creep of the new and old concrete after simply supported continuous transformation was analyzed. The results indicate that the largest bending moment in the midspan is decreased by 13.8% under the most unfavorable conditions, and the maximum shear in the edge across the lateral pivot is reduced by 7.6%, and the deflection in the midspan is even decreased by 42%. The bending moment led by the shrinkage and creep of the new and old concrete with different ages on pier top is positive bending moment, which is harmful to the force in cross section. The bending moment in the cross section of the secondary side span across is the biggest increase by 3.9%. Negative bending moment value on pier top decreased at the same time, the biggest decrease of that in the side span is 4.3%, so the effects are not significant.