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英文原文： Rehabilitation of rectangular simply supported RC beams with shear deficiencies using CFRP composites Ahmed Khalifa a,* , Antonio Nanni b a Department of Structural Engineering, University of Alexandria, Alexandria 21544, Egypt bDepartment of Civil Engineering, University of Missouri at Rolla, Rolla, MO 65409, USA Received 28 April 1999; received in revised form 30 October 2001; accepted 10 January 2002 Abstract The present study examines the shear performance and modes of failure of rectangular simply supported reinforced concrete(RC) beams designed with shear deficiencies. These members were strengthened with externally bonded carbon fiber reinforced polymer (CFRP) sheets and evaluated in the laboratory. The experimental program consisted of twelve full-scale RC beams tested to fail in shear. The variables investigated within this program included steel stirrups, and the shear span-to-effective depth ratio, as well as amount and distribution of CFRP. The experimental results indicated that the contribution of externally bonded CFRP to the shear capacity was significant. The shear capacity was also shown to be dependent upon the variables investigated. Test results were used to validate a shear design approach, which showed conservative and acceptable predictions. 2002 Elsevier Science Ltd. All rights reserved. Keywords: Rehabilitation; Shear; Carbon fiber reinforced polymer 1. Introduction Fiber reinforced polymer (FRP) composite systems, composed of fibers embedded in a polymeric matrix, can be used for shear strengthening of reinforced con-crete (RC) members [1–7]. Many existing RC beams are deficient and in need of strengthening. The shear failure of an RC beam is clearly different from its flexural failure. In shear, the beam fails suddenly without sufficient warning and diagonal shear cracks are consid-erably wider than the flexural cracks [8]. The objectives of this program were to: 1. Investigate performance and mode of failure of simply supported rec