Tests of reinforced concrete beams strengthened with wire rope units

Kim, S.Y.; Yang, Keun–Hyeok; Byun, Hang-Yong; Ashour, Ashraf

doi:10.1016/j.engstruct.2006.12.013

Cited by 35 publications

(23 citation statements)

References 4 publications

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“…To evaluate the torque coefficient of the proposed wire rope unit, forty specimens composed of eye-bolt, nut and wire rope with load cell were tested as shown in Fig. 2 7 . Based on test results, the torque coefficient k in the developed wire rope unit can be reasonably assumed as 0.3.…”

Section: Strengthening Proceduresmentioning

confidence: 99%

Axial behaviour of reinforced concrete short columns strengthened with wire rope and T-shaped steel plate units

Yang¹,

Ashour²,

Lee³

2009

Magazine of Concrete Research

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This paper presents a relatively simple column strengthening procedure using unbonded wire rope and T-shaped steel plate units. Twelve strengthened columns and an unstrengthened control column were tested to failure under concentric axial load to explore the significance and shortcomings of the proposed strengthening technique. The main variables investigated were the volume ratio of wire ropes as well as geometrical size and configuration of T-shaped steel plates. Axial load capacity and ductility ratio of columns tested were compared with predictions obtained from the equation specified in ACI 318-05 and models developed for conventionally tied columns, respectively. The measured axial load capacities of all strengthened columns were higher than predictions obtained from ACI 318-05, indicating that the ratio of the measured and predicted values increased with the increase of volume ratio of wire ropes and flange width of T-shaped steel plates. In addition, at the same lateral reinforcement index, a much higher ductility ratio was exhibited by strengthened columns having a volume ratio of wire ropes above 0·0039 than tied columns. The ductility ratio of strengthened columns tested increased with the increase of flange width, thickness, and web height of T-shaped steel plates. A mathematical model for the prediction of stress–strain characteristics of confined concrete using the proposed strengthening technique is developed, that was in good agreement with test results.

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Section: Strengthening Proceduresmentioning

confidence: 99%

Axial behaviour of reinforced concrete short columns strengthened with wire rope and T-shaped steel plate units

Yang¹,

Ashour²,

Lee³

2009

Magazine of Concrete Research

Self Cite

View full text Add to dashboard Cite

show abstract

“…In particular, those beams strengthened with unbonded type showed ductile behavior though they failed in shear. Based on their test results, Teng et al 8 and Kim et al 6 concluded that the externally unbonded-type shear strengthening technique for reinforced concrete beams is highly economical, and environmentally and structurally efficient.…”

Section: Introductionmentioning

confidence: 99%

“…Many effective shear strengthening procedures [1][2][3][4][5] by externally bonding steel plates or high strength non-metallic fiber laminates to concrete surfaces were developed. However, few drawbacks were also identified in the bonded type strengthening technique [6][7] , such as debonding of external laminates from concrete surface due to interface shear stress concentration at the laminate end, and the long term behavior of the system owing to different coefficients of thermal expansion of concrete, adhesive, and non-metallic fiber laminates. As a result, unbonded type strengthening procedures 6,8 have been recently developed.…”

Section: Introductionmentioning

confidence: 99%

“…However, few drawbacks were also identified in the bonded type strengthening technique [6][7] , such as debonding of external laminates from concrete surface due to interface shear stress concentration at the laminate end, and the long term behavior of the system owing to different coefficients of thermal expansion of concrete, adhesive, and non-metallic fiber laminates. As a result, unbonded type strengthening procedures 6,8 have been recently developed. Teng et al 8 showed that shear capacity of deep beams predamaged in shear could be restored using external prestressed steel clamping units.…”

Section: Introductionmentioning

confidence: 99%

“…Teng et al 8 showed that shear capacity of deep beams predamaged in shear could be restored using external prestressed steel clamping units. Kim et al 6 carried out tests on beams strengthened with external wire rope units and proposed that shear capacity of predamaged beams strengthened with the proposed technique could be enhanced by 120 to 170% of that of original beams. In particular, those beams strengthened with unbonded type showed ductile behavior though they failed in shear.…”

Section: Introductionmentioning

confidence: 99%

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Shear strengthening of continuous reinforced concrete T-beams using wire rope units

Yang¹,

Byun²,

Ashour³

2009

Engineering Structures

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A simple unbonded-type shear strengthening technique for reinforced concrete beams using wire rope units is presented. Ten two-span reinforced concrete T-beams externally strengthened with wire rope units and an unstrengthened control beam were tested to failure to explore the significance and shortcomings of the developed unbonded-type shear strengthening technique. The main parameters investigated were the type, amount and prestressing force of wire rope units. All beams tested failed owing to significant diagonal cracks within the interior shear span. However, beams strengthened with closed type wire rope units exhibited more ductile failure than the unstrengthened, control beam or those strengthened with U-type wire rope units. The diagonal cracking load and ultimate shear capacity of beams with closed-type wire rope units were linearly increased with the increase of vertical confinement stresses in concrete owing to the prestressing force in wire rope units, while those of beams with U-type wire rope units were little influenced. It was also observed that average stresses in closed-type wire ropes crossing diagonal cracks at ultimate strength of beams tested were far much higher than those in U-type wire rope units, showing better utilization in case of closedtype wire ropes. The shear capacity of beams with closed-type wire rope units is conservatively predicted using the equations of ACI 318-05 for shear modified to account for the external wire rope units. A numerical formula based on the upper bound analysis of the plasticity theory is also developed to assess the load capacity of continuous T-beams strengthened with wire rope units.Comparisons between measured and predicted shear capacities showed that the coefficient of variation obtained from the mechanism analysis is less than that from the modified ACI 318-05 equations. In addition, the predictions by the mechanism analysis for beams with closed-type wire rope units are in good agreement with test results, regardless of the value of stresses used for the calculation of energy dissipated in wire ropes.

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Experimental study on RC beams shear‐strengthened with composite polymer mortar and steel strands wire mesh

Wang,

He,

et al. 2024

Structural Concrete

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This paper presents an experimental investigation of the use of composite polymer mortar (CPM) and steel strands wire mesh (SSWM) to strengthen reinforced concrete (RC) beams in shear. In order to maximize the shear resistance of the steel strands, a new type of anchor device called wedge‐shaped steel plate hoops (WSSPHs) was developed. And the study aimed to examine the effect of shear‐to‐span ratio and prestressing level on the mechanical properties of the beams. A total of nine beams were constructed and tested under four‐point bending monotonic load, comprising three control beams and six strengthened beams. The study analyzed the damage modes, load‐deflection curves, strength, stiffness, and ductility of the beams. The test results indicated that (1) the mechanical properties of the strengthened beams were improved, with the shear capacity improving by 38.47%–71.37% after strengthening. (2) It was observed that SSWM could be utilized more effectively in high shear‐to‐span ratio beams among the strengthened beams with the same prestressing level. (3) Additionally, the larger prestressing level was found to change the design damage mode of the test beams, with RB‐2.5‐0.5 failing in bending. Finally, a model was proposed to predict the shear capacity of the test beams based on the specification GB 50011‐2010. The model considered the effect of the initial prestressing of the steel strands.

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Tests of reinforced concrete beams strengthened with wire rope units

Cited by 35 publications

References 4 publications

Axial behaviour of reinforced concrete short columns strengthened with wire rope and T-shaped steel plate units

Axial behaviour of reinforced concrete short columns strengthened with wire rope and T-shaped steel plate units

Shear strengthening of continuous reinforced concrete T-beams using wire rope units

Experimental study on RC beams shear‐strengthened with composite polymer mortar and steel strands wire mesh

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