Splicing Mode of New and Old Bridges on Expressway

In this paper,through the establishment of beam grillage space model,it analyzes the influence of different connection mode of new and old bridge on transverse distribution of live load and old bridge force performance,analyzes the influence of shrinkage and creep on the support reaction of new bridge after splicing.The results show that:The connection mode of new and old bridge has smaller effect on transverse distribution coefficient of the widened bridge,But the transverse distribution coefficient of upper beam slab of the old bridge is greatly reduced compared with the initial state,and its load capacity increases;the stress state of the old bridge after widened is improved;shrinkage and creep has great influence on the support reaction of the beam adjacent the wet joint,the support type that the bearing capacity is bigger should be selected when the new bridge is designed,in order to ensure the sufficient bearing capacity of the support.