A practical method for determining shear crack induced deformation in FRP RC beams

Imjai, Thanongsak; Guadagnini, Maurizio; Garcia, Reyes; Pilakoutas, Kypros

doi:10.1016/j.engstruct.2016.08.007

Cited by 26 publications

(15 citation statements)

References 23 publications

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“…However, shear-induced deformations can be up to 30% of the total beam deflection due to the lower stiffness of GFRP bars compared to steel. To calculate the component of deflection due to shear action and crack opening, the proposed model uses a 'single fictitious inclined crack' with a width equal to the sum of the individual effective shear crack widths [Imjai T. et al 2016].…”

Section: Introductionmentioning

confidence: 99%

Comparison Crack Resistance of RC Beams with and without Transverse Reinforcement after Shear Testing

Vegera

Khmil

Vashkevych

et al. 2019

Quality Production Improvement - QPI

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Main parameters, which characterize shear strength, are crack distribution, width of diagonal crack opening and angle of inclined crack. There are in this article, comparison crack resistant of testing reinforced concrete (RC) beams on the shear with such variable parameters like presence or absence internal reinforcement, different shear span, and presence or absence external composite reinforcement. Shear span (relative span to effective depth ratio) was acquired the following values: a/d=2, 1.5, 1. For internal reinforcement, rebar’s A240C with diameter 8 mm and steps 100 mm was chosen. The composite FRCM system was like external reinforcement with three stripe of composite fabric with width 70 mm and step 100 mm. Eight RC beams were tested. After testing, we discovered that the most influenced on the serviceability capacity was shear span. Internal transverse reinforcing increased shear strength on the same level and it was independent from shear span and other factors. Only quantity of reinforcing determine level of increasing shear capacity. FRCM system is efficient strengthening system, which significant increase shear crack resistant for RC beams. External FRCM reinforcing increase shear crack resistance on the same percentage and independent from presence or absence internal reinforcement.

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Section: Introductionmentioning

confidence: 99%

Comparison Crack Resistance of RC Beams with and without Transverse Reinforcement after Shear Testing

Vegera

Khmil

Vashkevych

et al. 2019

Quality Production Improvement - QPI

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show abstract

“…Previous research has also studied the effect of bends in FRP stirrups, but using geometries similar to those used in conventional steel stirrups [ 48 , 51 , 59 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 ]. In these conditions, the tight corner radius of FRP stirrups tended to limit the shear capacity of the concrete beams, where premature failure was generally observed in the proximity of the bent portion [ 51 , 64 , 72 ].…”

Section: Research On the Strength Degradation Of Curved Frpsmentioning

confidence: 99%

Strength Degradation in Curved Fiber-reinforced Polymer (FRP) Bars Used as Concrete Reinforcement

et al. 2020

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Steel reinforcements in concrete tend to corrode and this process can lead to structural damage. Fiber-reinforced polymer (FRP) reinforcements represent a viable alternative for structures exposed to aggressive environments and have many possible applications where superior corrosion resistance properties are required. The use of FRP rebars as internal reinforcements for concrete, however, is limited to specific structural elements and does not yet extend to the whole structure. The reason for this relates to the limited availability of curved or shaped reinforcing FRP elements on the market, as well as their reduced structural performance. This article presents a state-of-the art review on the strength degradation of curved FRP composites, and also assesses the performance of existing predictive models for the bend capacity of FRP reinforcements. Previous research has shown that the mechanical performance of bent portions of FRP bars significantly reduces under a multiaxial combination of stresses. Indeed, the tensile strength of bent FRP bars can be as low as 25% of the maximum tensile strength developed in a straight counterpart. In a significant number of cases, the current design recommendations for concrete structures reinforced with FRP were found to overestimate the bend capacity of FRP bars. A more accurate and practical predictive model based on the Tsai–Hill failure criteria is also discussed. This review article also identifies potential challenges and future directions of research for exploring the use of curved/shaped FRP composites in civil engineering applications.

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“…Disturbance of plane section strains due to shear cracks is well known and additional deformations due to shear cracks have been documented (e.g. Imjai et al 2016). The local strain measurements are also affected by the bond between the bars used in the test and the surrounding concrete.…”

Section: Strains In Reinforcementmentioning

confidence: 99%

Effect of Beam Depth on Shear Behavior of FRP RC Beams

et al. 2019

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Article:Cholostiakow, S., Di Benedetti, M. orcid.org/0000-0001-7870-1323, Pilakoutas, K. orcid.org/0000-0001-6672-7665 et al. (1 more author) (2019) Effect of beam depth on shear behavior of FRP RC beams. Journal of Composites for ConstructionAbstract: The behaviour of shear critical fibre-reinforced-polymer (FRP) reinforced concrete (RC) elements is characterised by the development of comparatively large strains and crack widths, which can be strongly influenced by their relative geometrical size. This paper investigates experimentally the size effect on the shear behaviour of FRP RC beams with and without shear reinforcement and overall depth varying from 260 mm to 460 mm. The results confirm a considerable size effect for members without shear reinforcement, showing an average reduction in normalized shear strength of about 19 %, with maximum value up to 40 %.It is also shown that current design provisions are overall conservative, but with non-uniform margins of safety that decrease with increasing member depth. It is anticipated that the results of this study will help improve the efficiency of future design equations for the shear strength of FRP RC.

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A practical method for determining shear crack induced deformation in FRP RC beams

Cited by 26 publications

References 23 publications

Comparison Crack Resistance of RC Beams with and without Transverse Reinforcement after Shear Testing

Comparison Crack Resistance of RC Beams with and without Transverse Reinforcement after Shear Testing

Strength Degradation in Curved Fiber-reinforced Polymer (FRP) Bars Used as Concrete Reinforcement

Effect of Beam Depth on Shear Behavior of FRP RC Beams

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