Study on the Mechanical Properties of Preloaded RC Beams Shear-Strengthened with CFRP Sheets
[Objective]The shear tests of four rectangular reinforced concrete(RC)beams were conducted to in-vestigate the effects of the end-anchorage method and preloading on the shear behavior of the carbon fiber rein-forced polymer(CFRP)-strengthened RC beams.[Method]The failure mode,load-deflection curve,characteris-tic load,strain developments of the stirrup and CFRP were analyzed.Finally,the shear capacity of the specimens was predicted using the existing calculation methods for the shear capacity of the CFRP-strengthened RC beam.[Result]The test results show that the using U-shaped CFRP strengthening can significantly enhance the shear behavior of RC beams under the reliable end-anchorage.The shear strengthening effect is significantly affected by the end-anchorage methods.The mechanical anchorage is obviously superior to the CFRP sheet anchorage.Compared with the unstrengthened beam,the shear capacity of the strengthened beam with the mechanical an-chorage increases by about 60%,whereas that with the CFRP sheet anchorage only increases by 9.8%.The pre-loading significantly decreases the cracking load of the strengthened beams,but does not affect the shear capaci-ty.[Conclusion]The research results can provide reference for the engineering application of shear strengthen-ing of RC beams with CFRP sheets.
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