External shear strengthening of RC beams with basalt fiber sheets: An experimental study

Kar, Swapnasarit; Biswal, K. C.

doi:10.1016/j.istruc.2021.01.094

Cited by 22 publications

(6 citation statements)

References 29 publications

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“…Also, it can be found in accordance with toughness or energy absorption, which is defined as the area under the load-deflection curve up to the ultimate load [36]. It was more suitable to use the toughness or energy absorption procedure to calculate the ductility for the specimens that failed in shear [37], [38]. Figure 10 presents the energy absorption of tested specimens, its clear that uttlize UHPC in the joint region improves the energy absorption significantly.…”

Section: Ductilitymentioning

confidence: 99%

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Structural behavior of ultra-high performance concrete corner beam-column joint under bidirectional loading

Nadir

Ali

2023

Preprint

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In the past few decades, extensive experimental research has been focused on studying the performance of beam-column joints under cyclic load due to their involvement in the collapse of several reinforced concrete structures during earthquakes. However, the behavior of beam-column joints under monotonic load, especially bidirectional monotonic load, has not been well-described. This study aims to enhance the performance of reinforced concrete corner beam-column joints subjected to bidirectional monotonic loads by utilizing ultra-high performance concrete (UHPC). Four scaled RC corner beam-column joints were constructed, with two made entirely of normal strength concrete (NSC) and the other two utilizing UHPC in the joint region. The variables were the material and the spacing of transverse reinforcement in the joint region. In all tested specimens, the transverse reinforcement in the joint region was eliminated to reduce the congestion of steel reinforcement in this region. The results indicate that utilizing UHPC in the joint region significantly improves the performance of the corner beam-column joint. The main result was a shift in the failure mode of the tested specimen from brittle failure caused by joint shear failure to flexural failure by the development of a plastic hinge at the joint-beam interface. Additionally, the UHPC joint showed superior performance in terms of joint shear capacity, load carrying capacity, energy absorption, and damage tolerance, despite the removal of transverse reinforcement in the joint core. Furthermore, using UHPC in the joint region allows for a reduction in the transverse reinforcement in beams and columns, thus eliminating the congestion of steel reinforcement in the joint region.

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Section: Ductilitymentioning

confidence: 99%

“…Deformed steel bars of diameters 12, 10 and 6 mm are used to construct the tested specimens. ASTM C469 [37] 3.25 ASTM C469 [37] 14.16 (1) Characteristic cylinder compressive strength. (1) Assumed values…”

Section: Materials Propertiesmentioning

confidence: 99%

Structural behavior of ultra-high performance concrete corner beam-column joint under bidirectional loading

Nadir

Ali

2023

Preprint

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“…The anchorage technique prevented the GFRP sheet from debonding and improved the shear capacity of the shear‐upgraded beams 19 . Conversely, the failure load of basalt FRP‐reinforced beams improved by 17%–50%, while their toughness improved by 2.74 times compared to the reference specimen 21 . Moreover, the total efficiency of BFRP sheets in improving shear capacity was 20% larger than GFRP sheets.…”

Section: Introductionmentioning

confidence: 99%

“…The FRP was extensively investigated as a fast‐developing strengthening approach for defective structures in the form of EB‐FRP sheets 13,16–24 . The shear retrofitting of the deep beams with GFRP layers could delay the initiation of the shear cracks while the shear capacity enhanced as the GFRP layer increased 18 .…”

Section: Introductionmentioning

confidence: 99%

“…The FRP was extensively investigated as a fastdeveloping strengthening approach for defective structures in the form of EB-FRP sheets. 13,[16][17][18][19][20][21][22][23][24] The shear retrofitting of the deep beams with GFRP layers could delay the initiation of the shear cracks while the shear capacity enhanced as the GFRP layer increased. 18 The anchorage technique prevented the GFRP sheet from debonding and improved the shear capacity of the shear-upgraded beams.…”

Section: Introductionmentioning

confidence: 99%

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Shear performance of reinforced concrete beams strengthened in shear using NSM bars and reinforced HSC layers

Abdo

Sharaky

Ahmed

2023

Structural Concrete

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The reinforced concrete (RC) beams could be upgraded in shear using steel and fiber‐reinforced polymer (FRP) having several shapes (bars, strips, or sheets). Using near‐surface mounted (NSM) Glass FRP (GFRP) bars is still limited compared to carbon FRP (CFRP) elements as shear reinforcement. Moreover, using reinforced high‐strength concrete layers (HSCL) as NSM shear strengthening for the RC beams is still limited. Herein, three RC beams internally reinforced in shear using different shear areas (without, 100 mm stirrups apart, and 200 mm stirrups apart) were experimentally tested as reference beams (CB). Other eight beams strengthened in shear using NSM HSCL, and bars were experimentally tested. Moreover, an extended finite element (FE) simulation was implemented through a verified FE model to study the effect of other NSM aspects on shear‐strengthened beam response. The results explained that, regardless of the internal stirrups area and external NSM characteristics, the shear‐strengthened beams showed higher load efficiency than the corresponding CB. The NSM upgraded shear beam had slightly higher load efficiency than the un‐strengthened beam having the same steel area as internally shear stirrups. Moreover, increasing the internal shear stirrups decreased the total efficiency of the NSM shear strengthening and the internal stirrups regardless of the NSM characteristics. Furthermore, the NSM HSCL was more efficient than the corresponding NSM bars in increasing the load capacity and stiffness of the shear‐strengthened beams. The reported analytical model predicted well the shear capacity of the tested beams.

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Performance of the Pre-Damaged Reinforced Concrete Beam Repaired using CFRP and Epoxy Injection

Saliah

Yahya

2021

J Fail. Anal. and Preven.

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External shear strengthening of RC beams with basalt fiber sheets: An experimental study

Cited by 22 publications

References 29 publications

Structural behavior of ultra-high performance concrete corner beam-column joint under bidirectional loading

Structural behavior of ultra-high performance concrete corner beam-column joint under bidirectional loading

Shear performance of reinforced concrete beams strengthened in shear using NSM bars and reinforced HSC layers

Performance of the Pre-Damaged Reinforced Concrete Beam Repaired using CFRP and Epoxy Injection

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