concrete open-wall systems wrapped with frp under torsional loads在扭转负载下混凝土露天墙体系统用玻璃钢.pdf

Materials 2012, 5, 2055-2068; doi:10.3390/ma5112055 OPEN ACCESS materials ISSN 1996-1944 /journal/materials Article Concrete Open-Wall Systems Wrapped with FRP under Torsional Loads Geminiano Mancusi *, Luciano Feo and Valentino P. Berardi Department of Civil Engineering, University of Salerno, Fisciano 84084, Italy; E-Mails: l.feo@unisa.it (L.F.); berardi@unisa.it (V.P.B.) * Author to whom correspondence should be addressed; E-Mail: g.mancusi@unisa.it; Tel./Fax: +39-89-963-412. Received: 24 September 2012; in revised form: 18 October 2012 / Accepted: 19 October 2012 / Published: 25 October 2012 Abstract: The static behavior of reinforced concrete (RC) beams plated with layers of fiber-reinforced composite material (FRP) is widely investigated in current literature, which deals with both its numerical modeling as well as experiments. Scientific interest in this topic is explained by the increasing widespread use of composite materials in retrofitting techniques, as well as the consolidation and upgrading of existing reinforced concrete elements to new service conditions. The effectiveness of these techniques is typically influenced by the debonding of the FRP at the interface with concrete, where the transfer of stresses occurs from one element (RC member) to the other (FRP strengthening). In fact, the activation of the well-known premature failure modes can be regarded as