Strength and ductility of simple supported R/C beams retrofitted with steel plates of different width-to-thickness ratios

Rakgate, S.M.; Dundu, M.

doi:10.1016/j.engstruct.2017.12.012

Cited by 22 publications

(18 citation statements)

References 12 publications

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“…It saves resources, reduces emissions, and minimizes disturbing interventions in the environment. Cross section strengthening is done with reinforcing bars embedded into mortar or shotcrete 4,5 and sheets or plates bonded to the surface 6,7 . Typical materials are steel, fiber‐reinforced polymers, or textile‐reinforced concrete (RC) solutions that have been widely established over the last 20 years 1,8,9 …”

Section: Introductionmentioning

confidence: 99%

“…Cross section strengthening is done with reinforcing bars embedded into mortar or shotcrete 4,5 and sheets or plates bonded to the surface. 6,7 Typical materials are steel, fiberreinforced polymers, or textile-reinforced concrete (RC) solutions that have been widely established over the last 20 years. 1,8,9 But, all these techniques are just effective against live loads.…”

Section: Introductionmentioning

confidence: 99%

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Strengthening of beams or slabs using temperature induction

Löschmann

Mark

2021

Structural Concrete

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Several aged reinforced concrete (RC) structures need to be strengthened. A typical method is to subsequently add rebar into slots filled with bonding mortar. However, this kind of strengthening only acts for live loads, not for dead loads, if no prestressing or prior lifting is applied. To overcome this deficiency, a novel method is presented. It activates the postinstalled reinforcement for all types of loading by temporarily inducing temperature from the outside. Doing so, statically indeterminate structures are locally relieved from stresses by constraint moments from systematically induced vertical temperature gradients during strengthening. To set the size of the gradients, the nonlinear material behavior, especially the significant reductions in constraint forces due to softening, is taken into account. If tempering is stopped after strengthening, stresses from dead loads redistribute over the newly formed total cross section. The method is theoretically derived, discussed, and verified in the lab on a two‐span RC girder. It turns out appropriate to enhance the bending resistance of beams or slabs.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Strengthening of beams or slabs using temperature induction

Löschmann

Mark

2021

Structural Concrete

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“…Steel plates have been utilized widely to strengthen the RC beams in recent years (Garden and Hollaway 1998). Rakgate and Dundu (2018) showed that the externally bonded steel plates could greatly improve the bending stiffness and load-carrying capacity of RC beams, and to decrease the deflection at midspan and crack width of RC beams. Strengthening with FRP strips or steel plates both have certain effect on the behavior of RC beams, but both of them have the limitations.…”

Section: Introductionmentioning

confidence: 99%

Behavior of a 60-year-old Reinforced Concrete Box Beam Strengthened with Basalt Fiber-reinforced Polymers Using Steel Plate Anchorage

Shen

Jiao

et al. 2021

ACT

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In the past twenty years, fiber-reinforced polymer (FRP) has been utilized broadly to strengthen concrete structures for its superiority. The influence of FRP and end anchorage with FRP U-strips or grooving on the behaviors of reinforced concrete (RC) beams has been investigated. However, investigations on the influence of basalt FRP (BFRP) and steel plates on the behaviors of strengthened RC beams remain lacking, especially under the circumstances that the RC beams are full-scale and cracked. The present study investigated the influence of BFRP and steel plates on the behaviors of full-scale cracked RC beams including failure mode, load-carrying capacity, stress-strain relationship and stiffness. Test results demonstrated that: (1) BFRP improved the behaviors of full-scale cracked RC beams from multiple angles; (2) the steel plates had a better effect on restricting the development of cracks and increasing the load-carrying capacity of full-scale cracked RC beams than FRP U-strips; (3) the calculation method considering the influence of FRP debonding was proved effectively to obtain the theoretical load-carrying capacity of BFRP-strengthened RC beams anchoring with steel plates; (4) the steel plates could postpone the development of BFRP debonding at the initial stage, and delay the further propagation of the debonding.

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“…Prior to CFRP materials, other materials have been used in shear and flexural strengthening applications such as steel [ 15 , 16 , 17 , 18 , 19 , 20 ]. Recently aluminum alloys have been used as externally bonded reinforcement material for both shear and flexure [ 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Analytical Investigations of the Use of Groove-Epoxy Anchorage System for Shear Strengthening of RC Beams Using CFRP Laminates

2020

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Reinforced concrete (RC) beams strengthened in shear with carbon fiber reinforced polymer (CFRP) laminates as externally bonded reinforcement (EBR) usually fail due to debonding. This paper presents an experimental and analytical investigation on the use of groove-epoxy as an anchorage system for CFRP plates and sheets bonded on both sides of shear deficient RC beams. The aim of this study is to assess the effectiveness of using groove-epoxy in enhancing the shear capacity of RC beams. Nine rectangular RC beams were strengthened with CFRP plates and sheets with groove-epoxy anchorage systems of different groove widths and tested under four point bending. It is observed that the RC beams strengthened with the groove-epoxy anchorage system showed an increase in the shear-strength over the unstrengthened control beam up to 112 and 141% for plates and sheets, respectively. Also, the increase of shear-strength contribution of the groove-epoxy system to that of CFRP without grooves ranged between 30–190% for CFRP plates and between 40–100% for CFRP sheets. Generally, the contributions of groove-epoxy on shear-strength decreased with the increase of groove width. Moreover, shear strength prediction models, based on modifications of the ACI440.2R-17 shear model, were developed by incorporating groove factors as a modifier to the FRP shear-strength contribution. The developed models predicted the experimental shear-strength of the tested RC beams with a good level of accuracy, with an average mean absolute percent error (MAPE) = 3.31% and 6.68%, normalized mean square error (NMSE) = 0.072, 0.523, and coefficient of determination R2 = 0.964, 0.691, for plates and sheets, respectively.

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Strength and ductility of simple supported R/C beams retrofitted with steel plates of different width-to-thickness ratios

Cited by 22 publications

References 12 publications

Strengthening of beams or slabs using temperature induction

Strengthening of beams or slabs using temperature induction

Behavior of a 60-year-old Reinforced Concrete Box Beam Strengthened with Basalt Fiber-reinforced Polymers Using Steel Plate Anchorage

Experimental and Analytical Investigations of the Use of Groove-Epoxy Anchorage System for Shear Strengthening of RC Beams Using CFRP Laminates

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