To research the effect of FRP-bolt strengthening technology and to examine the strengthening effect on RC beams in shear, contrast tests of FRP surface adhesion (EB-FRP) and FRP-bolt hybrid boding (HB-FRP) are conducted in laboratory on the basis of the destructive characteristics of aging RC beam bridges. The results of the EB-FRP and HB-FRP are compared. The influence of pre-cracking level and FRP strip spacing on RC beams strengthened in shear with HB-FRP is assessed particularly. The experiment results show that HB-FRP is a more reliable strengthening technique which can improve the shear capacity of beams. The new bolt-fastening technique does not rely on bearing to transmit the interfacial shear, but increases the interfacial bond by resisting the separation of the FRP laminate from the concrete substrate by the bolt pretension instead. This study contributes to direct the design and the construction of HB-FRP.
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