Experimental Study on Shear Behavior of Rc Beams Using U-Shaped Ufc Permanent Formwork With Shear Keys and Bolts

Wirojjanapirom, Puvanai; Matsumoto, Koji; Kono, Katsuya; Niwa, Junichiro

doi:10.2208/jscejmcs.69.67

Cited by 8 publications

(4 citation statements)

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“…ere are some publications relating to the shear strengthening of RC beams using fiber-reinforced concrete [31][32][33][34][35][36][37]. Wirojjanapirom et al [31] introduced the use of ultra high strength fiberreinforced concrete permanent formwork for enhancing the shear capacity of RC beams. Ruano et al [32] used the castin-place FRC jacketing with different fiber dosages to improve shear capacity of the RC beams.…”

Section: Introductionmentioning

confidence: 99%

Using Steel Fiber‐Reinforced Concrete Precast Panels for Strengthening in Shear of Beams: An Experimental and Analytical Investigation

Jongvivatsakul

Bui

Koyekaewphring

et al. 2019

Advances in Civil Engineering

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In this paper, the performances of reinforced concrete (RC) beams strengthened in shear with steel fiber-reinforced concrete (SFRC) panels are investigated through experiment, analytical computation, and numerical analysis. An experimental program of RC beams strengthened by using SFRC panels, which were attached to both sides of the beams, is carried out to investigate the effects of fiber volume fraction, connection type, and number and diameter of bolts on the structural responses of the retrofitted beams. The current shear resisting model is also employed to discuss the test data considering shear contribution of SFRC panels. The experimental results indicate that the shear effectiveness of the beams strengthened by using SFRC panels is significantly improved. A three-dimensional (3D) nonlinear finite element (FE) analysis adopting ABAQUS is also conducted to simulate the beams strengthened in shear with SFRC panels. The investigation reveals the good agreement between the experimental and analytical results in terms of the mechanical behaviors. To complement the analytical study, a parametric study is performed to further evaluate the influences of panel thickness, compressive strength of SFRC, and bolt pattern on the performances of the beams. Based on the numerical and experimental analysis, a shear resisting model incorporating the simple formulation of average tensile strength perpendicular to the diagonal crack of the strengthened SFRC panels is proposed with the acceptable accuracy for predicting the shear contribution of the SFRC system under various effects.

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Section: Introductionmentioning

confidence: 99%

Using Steel Fiber‐Reinforced Concrete Precast Panels for Strengthening in Shear of Beams: An Experimental and Analytical Investigation

Jongvivatsakul

Bui

Koyekaewphring

et al. 2019

Advances in Civil Engineering

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“…For instance, Wirojjanapirom et al (2013) studied the shear performance of the RC beams using U-shaped UFC permanent formwork and proposed the shear calculation of the composite structure by using the simplified shear carrying model. In case of strengthening field, Wang et al (2013) attached the 7 mm-thick UFC panels at the anchorage zone of tensile reinforcement steels for investigating the shear enhancement.…”

Section: Introductionmentioning

confidence: 99%

Shear Strengthening Performance of Post-tensioned UFC Panel on Reinforced Concrete Beams

Limpaninlachat

Nakamura

Kono³

et al. 2017

ACT

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The ultra high strength fiber reinforced concrete (UFC) is an advanced cementitious material which grants the high performances in strength, durability, and ductility. Because of these high performances, in this study, it was applied into the new idea for shear strengthening to RC beams, namely the post-tensioned UFC panel. It is the prefabricated UFC panel prestressed by some prestressing force. Three parameters (i.e., the number of post-tensioned UFC panel, the amount of prestressing rods, and the prestressing level in the UFC panels) were studied from eight strengthened beams for investigating the shear strengthening performance. All specimens were subjected to four-point bending. The results of the strengthened beams and the non-strengthened beam revealed that the strengthening by post-tensioned UFC panel increases the shear capacity, stiffness, and ductility of the beams. Moreover, the prestressing level also influenced the delay of the initial cracking load and the yielding of stirrups. Finally, the shear capacity carried by the post-tensioned UFC panel was proposed by using the force equilibrium along the assumption of imaginary diagonal crack.

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“…UFC can perform high flexural toughness and ductility according to the effect of steel fibers. Moreover, the close-packed structure of UFC provides excellent durability against severe environments such as chloride attack and heavy abrasion 4) . From the comparison of the beam sections made by prestressed UFC and H-shaped steel to resist the same moment capacity (150 kN-m), the size and self-weight between two sections are comparable (50 kg/m) 5) ; but, UFC has better durability against severe environment.…”

Section: Introductionmentioning

confidence: 99%

Flexural Strengthening Effect of Pre-Tensioned Ufc Panel on Reinforced Concrete Beams

et al. 2016

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Recently, various strengthening methods have been utilized to enhance the structural performance and extend the life cycle of RC structures. However, the existing strengthening methods still have some drawbacks especially in the durability aspect. In this study, with the outstanding properties of UFC (i.e., high strength, ductility, and durability), a new flexural strengthening method using precast UFC panels was used to strengthen the RC beams. However, to obtain greater strengthening effect and durability, PC strands were pre-tensioned to the panel and this panel was subjected to a heat curing procedure to supplement a hydration procedure and eliminate the effect of shrinkage. Using this novel technology, this research was conducted to investigate the flexural enhancement and corresponding behavior of RC beams strengthened by pre-tensioned UFC panel. Five pre-tensioned UFC panels and eight strengthened RC beams were prepared and investigated using the bending test. Two different experimental parameters, i.e., prestressing level and amount of PC strands, were used. The undercut anchor bolts were applied for sufficient bonding between interfaces. The bending results of panels were investigated to compute the exact prestressing level in order to determine the calculation of prestressing losses. The results of the strengthened beams revealed that the pre-tensioned UFC panel drastically enhanced the loading capacity of RC beams, and each variable parameter affected the different structural characteristics. To ensure compatibility along a cross-section of the strengthening system, the compatibility along panel specimens and strengthened RC beams was investigated. Finally, the strain compatibility was satisfied at the mid-span of beams where the calculation of load-carrying capacity in strengthened beams could be carried out by using conventional flexural section analysis.

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Experimental Study on Shear Behavior of Rc Beams Using U-Shaped Ufc Permanent Formwork With Shear Keys and Bolts

Cited by 8 publications

References 0 publications

Using Steel Fiber‐Reinforced Concrete Precast Panels for Strengthening in Shear of Beams: An Experimental and Analytical Investigation

Using Steel Fiber‐Reinforced Concrete Precast Panels for Strengthening in Shear of Beams: An Experimental and Analytical Investigation

Shear Strengthening Performance of Post-tensioned UFC Panel on Reinforced Concrete Beams

Flexural Strengthening Effect of Pre-Tensioned Ufc Panel on Reinforced Concrete Beams

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