الفهرس Only 14 pages are availabe for public view
 |  | from | 96 |  |  |
| | | from | 96 | | |
Abstract
Fiber reinforced polymers (FRP) can be considered as a substitute for conventional steel reinforcement for structures subjected to aggressive environments. To apply this new technology a satisfactory degree of understanding is required for the behavior of these materials. The aim of the current study is to investigate the concrete contribution to shear strength for beams reinforced with FRP longitudinal bars. This contribution can be evaluated by testing FRP reinforced concrete beams without shear reinforcement.
A review for the available test results for members reinforced with FRP longitudinal bars without shear reinforcement results a database of 60 specimens. The available equations for predicting the value of the concrete shear strength for FRP reinforced members were also collected.
A comparison is made between the experimental results and the shear strengths calculated using the different available equations. Based on this comparison, the Building Research Institute-Japan (BRI) equation was found to fit best and a modification is proposed for this equation in order to improve its results.
An experimental test program was conducted to verify the results of the proposed equation for beams with low longitudinal reinforcement ratios. This program consisted of beam specimens longitudinally reinforced with carbon fibers (CFRP) bars and not provided with shear reinforcement. The parameters of this study were the longitudinal reinforcement ratio, the shear span to depth ratio and the concrete compressive strength.
The results of this experimental study revealed that modified BRI equation is not safe for beams with low reinforcement ratios and an additional adjustment was made. The results of this study revealed that further research is needed for the shear strength of concrete members reinforced with low reinforcement ratios ofFRP.