Evaluation of nsm method for strengthening of rc two fixed-end beama with composite of cfrp bars
Subject Areas : Analysis of Structure and Earthquakemohammadkazeme sharbatdar 1 , mohammadreza mohamadiyan 2
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Keywords: Key words: Near Surface Mounted (NSM), FRP Bars, Flexural Strengthening, RC beam,
Abstract :
Near surface mounted (NSM) is a recent strengthening technique based on bonding carbon fiber reinforced polymer (CFRP) bars (rods or laminate strips) into pre-cut grooves on the concrete cover of the elements to strength. The corrosion or lack of steel bars in reinforced concrete members and the resulting deterioration of structures prompted research on fiber reinforced polymers (FRP) bars as potential reinforcement for concrete members, for use in new construction. These FRP bars can be used to increase flexural and shear capacity of existing concrete members at NSM (Near Surface Mounted) method. The paper presents the details and results of the experimental and numerical programs. Two large-scale reinforced concrete beams were designed, constructed, and tested under one point concentrated loading system. The specimens had two fixed-end support. They were in same size and reinforcement characteristic. A new type of CFRP bar was proposed in this study, the CFRP bars were manually made in laboratory and were hooked at end for anchoring in concrete. The test results has been used to calibrate the analytical models. Moreover extra analytical work has done. The results indicate that FRP bars can be used effectively in existing structures to increase their flexural capacity and change their crack pattern. Photographs taken at selected stages of loading illustrated the performance of each specimen. The force-displacement was presented and compared to find efficiency of FRP bars at NSM method.
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