Experimental Study And Analysis Of Load-carrying Capacity Of Corroded R.C. Beams Strengthened By Attachment Of Steel Plate

At present, due to the influence of environmental factors and the action of load, there are many bridges have variety diseases and can’t reach the durability requirement. Those bridges need to be maintained. Therefore, to study the durability problem, the maintenance and the reinforcement technique of the bridge have some important practically significance.This paper was supported by The Nation Natual Science Foundation[51178060] and the Ministry of communications application foundation project[2014319825160], the main research work can be summarized as follows:1) Taken the influence of the cover thickness, the strength of concrete and the corrosion rate into account, twelve R.C. beams had been designed, that were corroded by using acceleration corrosion method. The corroded R.C. beams were maintained by bolting and affixing steel plate at the bottom. Through the single point load experiment, the experiment data such as the failure forms, the bending capacity and the strain has been got.2) This paper analysis the influence of the bolting and affixing steel plate method to R.C. beams, and studied the difference of the bending capacity, the deformation and the failure forms about two sets of beams. Through the study of the bending capacity calculation about the two sets of beams, we get some calculation formula which can fit the experiment data well.3) Based on the time-dependent reliability theory, combined the experiment and an engineering example, simulated the rule of the time-dependent reliability degradation about R.C. beams. Determined the timing of the reinforcement, fit the practical data well, have some guiding significance to engineering.