Nonlinear behavior of shear deficient RC beams strengthened with near surface mounted glass fiber reinforcement under cyclic loading

Şakar, Gökhan; Hawileh, Rami A.; Naser, M.Z.; Abdalla, Jamal A.; Tanarslan, M.

doi:10.1016/j.matdes.2014.04.064

Cited by 49 publications

(17 citation statements)

References 27 publications

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“…Previous studies of GFRP reinforced concrete components mainly focused on a series of problems, such as low toughness and bond behavior, short‐ and long‐term durability, freeze–thaw performance, fire resistance and cracking resistance . In recent years, researchers have been considering the factors that affect the bond performance of GFRP bar‐reinforced concrete at different loads and their coupling conditions, including high and low temperature, freeze–thaw cycles, sustained load, fatigue load, cyclic loading, and loading rate . The application of the sustained load, lower than the maximum, after a process of unloading and reloading, causes an “immediate” deflection after cycling larger than that corresponding to the same load in the initial monotonic loading .…”

Section: Introductionmentioning

confidence: 99%

Bond‐Slip Behavior Between GFRP Bars and Mortar Based on Pull‐Out Tests

et al. 2018

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Bond performance is important in glass fiber reinforcement polymer (GFRP) bar reinforced mortar structure. To study bond behavior between GFRP bars and mortar, pull‐out tests were conducted on nine cylinder specimens with reinforced carbon sheets. The loading mode included monotonic loading and cyclic loading. Bond strength, slip, bond stiffness, and residual bond properties were investigated and fitted to bond‐slip curves of classical models. The results show that monotonic loading, cyclic constant loading, and cyclic variable loading have little effect on the ultimate bond strength between a GFRP bar and mortar. The bond‐slip curves have the same change laws. Under cyclic constant loading, bond stiffness increases with cycles loading times and is basically stable after 10 times, and the bond‐slip curves show the same characteristics. Under cyclic variable loading, bond stress–strain has a linear characteristic, bond stiffness presents a hardening tendency, and bond‐slip curve is similar and stable in each loading–unloading process. The ascending stage and descending stage of the bond‐slip curve match the modified Eligehausen, Popov, and Bertero (mBPE) model, no horizontal line is observed in the peak load stage, the descending stage curve is approximately linear, and the residual stage curve exhibits a fluctuating decreasing tendency. Based on the test results, a Gaussian function and its parameters are proposed for the expression of the residual stage. POLYM. COMPOS., 40:2840–2849, 2019. © 2018 Society of Plastics Engineers

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Section: Introductionmentioning

confidence: 99%

Bond‐Slip Behavior Between GFRP Bars and Mortar Based on Pull‐Out Tests

et al. 2018

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“…Bonding mechanisms and pullout test between concrete structures and NSM FRP were investigated in detail [9][10][11]; cyclic loading response of RC beams strengthened in shear with GFRP rods using NSM technique was investigated, and an effective finite element method to model the cyclic response of RC beams was developed [12]. Meanwhile, the NSM method was combined with externally bonded reinforcement [13]; a new proposal of T shape CFRP profile [14] was provided; and ductile strengthening using externally bonded and near surface mounted composite systems was evaluated [15].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Flexural Behavior of Granite Stone Slabs with Near Surface Mounted CFRP Bars and Screw‐Thread Steels

Gao

Chen

Ding

et al. 2018

Advances in Materials Science and Engineering

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An experimental study that investigates the behavior of stone slabs strengthened in fixure with near surface mounted (NSM) technique using screw-thread steels and carbon fiber-reinforced polymer (CFRP) bars is presented. A total of ten full-scale stone slabs were tested under a four-point bending loading to investigate the effect of groove dimension, reinforcement ratios, and reinforcement materials on the flexural performance of stone slabs. e test results included failure characteristics, yield and ultimate capacities, deflection of midspan, and cracking behavior of stone slabs. e test results indicate that with the increase of groove height and groove width, cracking load and middeflection decrease by 6.4%-14.18%; however, failure load and middeflection increase by 4.7%-41.2%. Cracking load, failure load, and failure displacement of stone slabs adopting NSM screwthread steels increased by 10.9%, 167%, and 617%, respectively, under the maximum reinforcement ratios of 0.629% over the control slab without NSM bars. Meanwhile, with the increase of reinforcement ratios, the failure mode transforms from brittle failure to ductile failure. e calculation results of strength are in agreement with the experimental results. Finally, it can be concluded that NSM CFRP bars are more effective than NSM screw-thread steels to improve flexural capacity with the same reinforcement ratios.

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“…Use of CFRP is preferred in strengthening of prestressed concrete elements due to their high stiffness and strength compared to GFRP. Some previous investigations have focused on the both experimental and numerical analysis of concrete elements strengthened with NSM technique [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%