Rehabilitation of rectangular simply supported RC beams with shear deficiencies using CFRP composites _' ?* E: v% L' X6 c
Ahmed Khalifa a,* , Antonio Nanni b% N- U2 w E( W
a Department of Structural Engineering, University of Alexandria, Alexandria 21544, Egypt
6 c( k/ m4 m* C3 LbDepartment of Civil Engineering, University of Missouri at Rolla, Rolla, MO 65409, USA
, @+ v7 e+ u4 X& A% ^" [Received 28 April 1999; received in revised form 30 October 2001; accepted 10 January 2002
( ?+ j: o, `& [' DAbstract
% q! T# a' N/ d; vThe 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.○C 2002 Elsevier Science Ltd. All rights reserved.
+ W v) P! T9 i: h Y- iKeywords: Rehabilitation; Shear; Carbon fiber reinforced polymer
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0 C) l \/ q0 T* x用碳纤维板(CFRP)修复剪切不足的矩形简支梁
( F) ?1 L. j0 `7 q% h3 G/ Z% r; e Ahmed Khalifaa Antonio Nannib0 b D6 i4 a- {3 d
a埃及亚历山大市亚历山大大学结构工程部 21544# s$ p! ?7 B" f, X
b美国密苏里州密苏里州大学土木工程部 65409
: ^$ S, x; J5 q1999年4月8号收到初稿，2001年10月30号收到校稿，2002年1月10号录用。$ i. q2 [9 r% ~; @ q
摘 要' a, `) T$ ?1 `$ |6 c ^
目前研究调查剪切特性和破岩模式的矩形简支钢筋混凝土梁设计存在剪切不足。在实验室中这些构件经过外部的粘合剂碳纤维板（CFRP）加强和校核过。本实验方案由十二根合格的简支梁剪切破坏测试构成的。测验项目包括箍筋和剪跨比, 以及CFRP的数量和分布。试验结果显示外部粘合剂CFRP对剪切承载力的贡献是重要的。证明剪切承载力取决于变量研究。实验结果用来证实一种保守并且可预测的剪切设计方法。（2002 Elsevier科学有限公司版权所有）。
0 j7 v/ B* X) v& E) @* w" W' B& { g关键字∶修复； 剪切； 碳纤维板（CFRP）
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