Flexural behavior of preloaded reinforced concrete beams strengthened by prestressed CFRP laminates

Gao, Peng; Gu, Xianglin; Mosallam, Ayman

doi:10.1016/j.compstruct.2016.08.013

Cited by 50 publications

(11 citation statements)

References 40 publications

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“…Steel structures of various forms are widely used in constructions [1,2], however, with adverse factors such as corrosion [3,4], dynamic loads [5,6], and impacts [7,8], steel structures are subject to damages [9,10]. Carbon fiber reinforced polymer (CFRP) materials are widely used to retrofit or reinforce damaged steel structures [11][12][13] due to their high strength-to-weight ratio, excellent corrosion resistance, and fast and easy installation. More recently, research on the application of CFRP materials for reinforcement of steel structures has received much attention [14].…”

Section: Introductionmentioning

confidence: 99%

Detecting Debonding between Steel Beam and Reinforcing CFRP Plate Using Active Sensing with Removable PZT-Based Transducers

Jiang

Deng

et al. 2019

Sensors

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Carbon fiber reinforced polymer (CFRP) plates are widely used to retrofit or reinforce steel structures, and the debonding damage between the steel structure and the CFRP plate is a typical failure in strengthening steel structures. This paper proposes a new approach to detecting debonding between a steel beam and a reinforcing CFRP plate by using removable lead zirconate titanate (PZT)-based transducers and active sensing. The removable PZT-based transducers are used to implement the active sensing approach, in which one transducer, as an actuator, is used to generate stress wave, and another transducer, as a sensor, is used to detect the stress wave that propagates across the bonding between the steel beam and the reinforcing CFRP plate. The bonding condition significantly influences the received sensor signal, and a wavelet-packet-based energy index (WPEI) is used to quantify the energy of the received signal to evaluate the severity of debonding between the steel beam and the reinforcing CFRP plate. To validate the proposed approach, experimental studies were performed, and two removable PZT-based transducers were designed and fabricated to detect the debonding between a steel beam and the reinforcing CRFP plate. The experimental results demonstrate the feasibility of the proposed method in detecting the debonding between a steel beam and the reinforcing CFRP plate using removable PZT-based transducers.

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Section: Introductionmentioning

confidence: 99%

Detecting Debonding between Steel Beam and Reinforcing CFRP Plate Using Active Sensing with Removable PZT-Based Transducers

Jiang

Deng

et al. 2019

Sensors

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“…In all published studies the mode of failure was based on the delamination of the SFRP [18][19][20][21][22][23][24], which resembles the most common mode of failure of typical FRP systems based on epoxy resins [9,12,13,15,17,[19][20][21][22][23][24][25]. To the best of our knowledge, the experimental data on the use of SFRP strips in shear strengthening applications is very limited [20,[24][25][26][27][28][29][30][31][32][33][34][35][36]. In addition, there is no experimental data in combination with mechanical anchors.…”

Section: Introductionmentioning

confidence: 99%

Seismic Retrofit of R/C T-Beams with Steel Fiber Polymers under Cyclic Loading Conditions

2019

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This paper presents results of an experimental study on seismic response of reinforced concrete (RC) T-beams with shear deficiencies strengthened with externally bonded steel fiber reinforced polymer (SFRP) strips. Seven cantilever RC beams were strengthened with externally bonded uniaxial SFRP strips in a U-shape configuration and were tested under cyclic loading conditions. The two main variables examined were the strip spacing and the use of anchoring system. Among the investigated anchoring systems, one was patented, and it is studied in the present manuscript. The examination of the results leads to the conclusion that the anchoring system has a significantly more pronounced effect on the performance of the beams and the mode of failure than the type or spacing of the strips. Furthermore, SFRP strips seem to have a great potential to be used for shear strengthening, especially since the use of mechanical anchoring systems drastically improves their performance. On the contrary, the lack of mechanical anchoring results in premature delamination of the strengthening system, and thus an undesirable SFRP material performance.

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“…Proper repair and strengthening RC elements with Fiber-Reinforced Polymers (FRP) have several benefits, such as high strength-to-weight ratio, high durability, ease of installation, and a possible reduction in corrosion activity [23,24]. Several researchers have successfully used FRP materials in order to improve the structural performance of RC members (References [25][26][27][28][29][30][31] among others). Ferrier et al [32] pointed out that the presence of a residual crack width affects the crack growth of a strengthened beam.…”

Section: Introductionmentioning

confidence: 99%

Corroded RC Beams at Service Load before and after Patch Repair and Strengthening with NSM CFRP Strips

2019

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This paper presents the experimental results of the structural behavior of four reinforced concrete beams with corroded steel reinforcement at service loads. One beam was non-corroded, one beam was corroded under an accelerated electrochemical technique to a small corrosion level (for one corrosion cycle), while two beams were corroded under the same conditions of an accelerated electrochemical technique and then subjected to vertical service loads that corresponded to 60% and 75% of the yield load of the non-corroded beam respectively for three corrosion cycles (with maximum mass loss around 25% for the first and 31% for the latter). Longitudinal cracks due to corrosion and flexural cracks due to loading were thoroughly recorded at the end of each cycle. The beam under the 75% service load had higher deflection increase for heavier corrosion. After the three successive serviceability load tests, the cracked concrete cover was removed and the steel rebars were treated. The cement-based repair mortar and two NSM FRP laminates were applied to both beams and were tested to failure. Despite the heavy corrosion, the patch repair and NSM strengthening enhanced the load-bearing capacity of the beams when compared with the non-corroded beam. All 10 tests are thoroughly discussed.

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Flexural behavior of preloaded reinforced concrete beams strengthened by prestressed CFRP laminates

Cited by 50 publications

References 40 publications

Detecting Debonding between Steel Beam and Reinforcing CFRP Plate Using Active Sensing with Removable PZT-Based Transducers

Detecting Debonding between Steel Beam and Reinforcing CFRP Plate Using Active Sensing with Removable PZT-Based Transducers

Seismic Retrofit of R/C T-Beams with Steel Fiber Polymers under Cyclic Loading Conditions

Corroded RC Beams at Service Load before and after Patch Repair and Strengthening with NSM CFRP Strips

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