Experimental study on flexural behavior of damaged RC beams strengthened with steel plate-UHPC composite
In order to study the flexural behavior of damaged reinforced concrete(RC)beams strengthened with steel plate-UHPC composite,one RC beam and two strengthened beams were tested,and their bearing capacity,deflection,strain and crack development were analyzed.The results show that compared with the unreinforced RC beam,the strengthened beam has a significant improvement in crack resistance,stiffness and ultimate bearing capacity.The cracking load is increased by 2.71 times and 3.19 times respectively,the bearing capacity is increased by 54%and 65%respectively,and the stiffness is increased by nearly 1 times.Since the failure mode is the debonding failure of the new and old concrete interface,the steel plate and the steel bar do not reach the yield strength under the ultimate state,and the material performance is not fully utilized.Such damage should be avoided in the reinforcement design.In addition,based on the truss model theory,the theoretical derivation of the debonding bearing capacity of the steel plate-UHPC composite strengthened beam was carried out,and the theoretical calculation formula was established.The results show that the calculated values of the debonding bearing capacity formula based on the truss model theory are in good agreement with the experimental results,and the relative difference is less than 10%.The theoretical model is reliable.
steel plate-UHPC composite strengthened beamdebonding of interfacetruss modeldebonding bearing capacity
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