| Abstract:In view of the existing bridge approach with prefabricated structure form of simply supported T beam, there are different degrees of injury and structure aging in the long-term use process of bridges; There have a rising trend in the load level of bridge;Because of large vehicles through the bridge, the short-term overload may cause permanent damage to bridges, now the bridge already can’t satisfy the traffic demand now, so it is increasingly urgent to bridge reinforcement and reconstruction. Taking the approach of jiujiang Yangtze river bridge (simply supported T beam with the span of40m) as the engineering background, by using Midas/Civil that a large-scale finite element analysis software,discussing the mechanical properties of simply supported T beam into Continuous beam with the pre-adding stowage method. This paper includes the following parts.1.Establish grillage model of the bridge to analyze the changes in the characteristics of the internal forces to stage pre-and post-loading bridge structure.2.Calculated the original structure and modified structure under different loading capacity, the change rule of internal force, stress and puts forward the influence of the reasonable parameters for practical engineering.3.The contrast analysis of the bridge to the double row bearings and single row bearing structure of the span and side span across the internal force and the change law of inflection, fracture of changeover portion and advice is given under the same reinforcement structure bearing adopts the form and the size of the additive and distribution load.4.Based on the additive loading method and the method of prestressed simply-supported structure of variable continuous pier top inflection changeover portion of the comparative analysis, draw a simply supported bridge using additive loading method is feasible reinforcing old bridge is applied to the engineering practice... |
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