Research needs concerning the performance of fiber reinforced (FR) composite retrofit systems for buildings and infrastructure

Goodwin, David G.; Sattar, Siamak; Dukes, Jazalyn; Kim, Jae Hyun; Ferraris, Chiara F.; Sung, Li‐Piin

doi:10.6028/nist.sp.1244

Cited by 5 publications

(2 citation statements)

References 95 publications

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“…These products have been proposed to use as an alternative to traditional steel rebars due to their high tensile strength, harsh corrosive resist ance, lighter weight compared to steel bars, and nonmagnetic feature [15][16][17][18]. FR composite is the most popular choice to retrofit many concrete elements including, columns, shear walls, slabs, and beams [19,20]. In spite of these advantages, the elastic modulus of FRP bars are lower than that of steel rebars, where for GFRP bars is 30-50 GPa, for CFRP is 120-150 GPa, and for AFRP is 70-180 GPa, which results in cracks and large deflection [21,22].…”

Section: Introductionmentioning

confidence: 99%

Flexural Performance of Concrete Beams Reinforced with Hybrid FRP-Steel Bars: A mini review

Abduljabbar¹,

Abdulsahib²

2023

ETJ

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 Using hybrid FRP/ steel bars in reinforcing concrete beams demonstrated better flexural performance.  Existing design method for reinforced concrete beams with hybrid reinforcements is reviewed.  Experimental and analytical studies regarding hybrid reinforced concrete beams are presented.  Further research directions are proposed to better understand the effect of many parameters on the flexural capacity.Reinforced concrete beams are the most generally used structural parts in building, bridges, and many other structures. In the past two decades, many investigations have been conducted using various fiber-reinforced polymer (FRP) material types /steel bars to reinforce concrete beams under flexural test. The purpose of this paper is to review the flexural performance of concrete beams reinforced with hybrid FRP and steel bars to better understand their behavior. The main parameters addressed by researchers were dimensions of beams, FRP bar material type, and hybrid reinforcement ratio. The researchers established that the use of the combination between steel and FRP reinforcement bars improves the performance of the concrete beams. M oreover, the studies showed that the ductility of the hybrid reinforced beams increased compared to that of conventional steel reinforced beams, however, it decreased when the ratio of (Af/As) increased. The application of using hybrid FRP/steel bars in reinforcing concrete beams will further increase upon utilizing techniques for reducing the brittleness and higher cost of FRP bars.The general structure of this paper consists of presenting the formulas offered by ACI 440.1R-15 building code relating to the flexural strength calculation of concrete beams reinforced with FRP/steel bars. The paper also details some of the current experimental tests and analytical works published for concrete beams reinforced with hybrid system, and outlines research directions and identifies gaps required for additional research.

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Section: Introductionmentioning

confidence: 99%

Flexural Performance of Concrete Beams Reinforced with Hybrid FRP-Steel Bars: A mini review

Abduljabbar¹,

Abdulsahib²

2023

ETJ

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“…Accelerated conditioning in a laboratory setting can provide valuable insight into the long-term durability of composites, but more field data are necessary to validate accelerated conditioning protocols, especially those used for strength reduction factors (Goodwin et al, 2019; Tatar and Hamilton, 2016a). So far, only a limited number of field studies investigated aging of EBFRP under realistic conditions Tatar and Milev (2021).…”

Section: Introductionmentioning

confidence: 99%

Performance of externally bonded fiber-reinforced polymer retrofits in the 2018 Cook Inlet Earthquake in Anchorage, Alaska

et al. 2021

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As part of the effort to improve the seismic performance of buildings in Alaska (AK), many of the deficient structures in Anchorage, AK, were retrofitted—some with externally bonded fiber-reinforced polymer (EBFRP) composite systems. The 2018 magnitude 7.1 Cook Inlet earthquake that impacted the same region offered an opportunity to evaluate the performance of EBFRP retrofits in a relatively high-intensity earthquake. This study summarizes the following findings of this field investigation: (1) the performance of EBFRP-retrofitted structures in the Cook Inlet earthquake and (2) the observations concerning the condition of FRP retrofits from over a decade of exposure in a subarctic environment. A deployment team from the National Institute of Standards and Technology (NIST) in collaboration with the University of Delaware (UD) Center for Composite Materials conducted post-earthquake inspections of EBFRP retrofits in multiple buildings to assess their performance during the earthquake and condition with respect to weathering. EBFRP debonding was documented with infrared thermography and acoustic sounding and the bond quality between EBFRP and concrete was assessed using pull-off tests. Visual inspections showed no major signs of earthquake damage in the EBFRP-retrofitted components. However, evaluation of debonding and pull-off test results suggested that outdoor conditions may have led to bond deterioration between EBFRP and concrete from installation defects that grew over time, freeze–thaw expansion from moisture present at the FRP/concrete interface, differences in thermal expansion of the materials, or a combination thereof. The carbon fiber–reinforced polymer (CFRP) bond to concrete was found to be more vulnerable to outdoor exposure than the glass fiber–reinforced polymer (GFRP) bond. Earthquake effects on FRP/concrete bond could not be assessed due to the lack of baseline data.

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Seismic and Durability Assessment of Externally Bonded FRP Retrofits in Reinforced Concrete Structures After 2018 Anchorage, AK Earthquake

Milev

Ahmed²,

Hassan

et al. 2021

Lecture Notes in Civil Engineering

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Research needs concerning the performance of fiber reinforced (FR) composite retrofit systems for buildings and infrastructure

Cited by 5 publications

References 95 publications

Flexural Performance of Concrete Beams Reinforced with Hybrid FRP-Steel Bars: A mini review

Flexural Performance of Concrete Beams Reinforced with Hybrid FRP-Steel Bars: A mini review

Performance of externally bonded fiber-reinforced polymer retrofits in the 2018 Cook Inlet Earthquake in Anchorage, Alaska

Seismic and Durability Assessment of Externally Bonded FRP Retrofits in Reinforced Concrete Structures After 2018 Anchorage, AK Earthquake

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