整体式桥梁结构受力性能的参数分析

o study the mechanical properties of integral bridges exposed to thermal variations, shrinkage and creep, a three span of bridge transforming from simple-surpported into continuous girders were chosen, where the adaptability of the substructure to the superstructure's deformation could also be learned. By concreting the connection segments on the top of the piers and side spans, the girders could be rigid-jointed with the piers and the abutment, in which way the selected bridge could be provided with structural characteristics of integral bridges. Springs were placed additionally behind the abutment and beside the piles to monitor soil-structure interaction based on the m-method according to Code for Design of Highway Reinforced Conrete and Prestressed Concrete Bridges and Culverts. A finite element model was established to analyze the mechanical properties of integral bridges when the condition of thermal variations, shrinkage and creep was employed. Studies indicated that internal force of the pier columns could be reduced effectively by decreasing the anti-pushing rigidity of the pier columns.