Model Experimental Study On Crack Ang Reinforcement Of RC Continuous Bridge's Bracket

With the development of the communication, a lot of bridges are constructed massively, and many bridges have used the box girder, considered the influences of the artistic and inorder to save the clearance underspan and reduce the total length of bridge, in its structural design, bracket is used to connect and transit on the bent cap supporting place. Bracket, as a lap structure in the beam bridge, is equipped with the force transmission support, so it's depth of cross-section is much smaller than regular cross-section, the section changes suddenly in this place and must transmit the vertical and horizontal reaction, the force centralism and proliferates through the force transmission support to other places, therefore it's stress is complex , the bracket is a weak link in superstructure.Because heavy load vehicles' increase with design theory imperfect and so on reasons, at present, some degrees disease have appeared, especially major bracket's cracking phenomenon has been comparatively grave. For safeguard bridge security operation, it is necessary to conduct the deep research to its reason, specially the crack origin, the forcing mechanism and the structure behavior, and simulate the crack bracket and then reinforce it, through the research of the reinforced effect, seek safely, effective and reasonable reinforcement method.This thesis carried on the crack and the reinforcement research in view of the continuous beam bridge's bracket, depended on the project of a reinforced concrete continuous beam bridge, unified its firsthand information and the spatial finite element method simulation analysis, a 1:2 scale model experiment had been carried on, inorder to understand the stress variation of the bracket's various sections. The model experiment simulated the actual bridge bracket's cracking process, through it, analyzed the primary cause of the bracket crack, and combined the actual project situation, used the pre-stressed reinforcement, sticking steel slab, pasting carbon fiber sheet to reinforce the bracket, compared with each reinforcement plan's feasibility and the validity, sought the reasonably, effective reinforcement method.Hoped that the experimental study achievement in this thesis can provide the beneficial reference for the bracket reinforcement method of other similar bridges.