Flexural strengthening of RC beams using distributed prestressed high strength steel wire rope: theoretical analysis

Wu, Gang; Wu, Zhishen; Wei, Yang; Jiang, Jianbiao; Cui, Yi

doi:10.1080/15732479.2012.715174

Cited by 13 publications

(12 citation statements)

References 11 publications

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“…Then the neutral‐axis depth x can be obtained. As indicated in Wu et al, 24 to avoid over‐strengthened and to ensure acceptable ductility of the RC beams after strengthening, the neutral‐axis depth should conform the following equation:

\frac{x}{h - a_{st}} \leq \min ((),, \frac{β_{1}}{1 + \frac{f_{y}}{E_{normals} ε_{cu}}}, \frac{β_{1}}{1 + \frac{0.002}{ε_{cu}} + \frac{f_{yp} - E_{sp} ε_{sp 0}}{E_{sp} ε_{cu}}})

…”

Section: Theoretical Analysismentioning

confidence: 99%

Strengthening of RC beams using the combination of EB CFRP sheet, NSM CFRP bar and P‐SWRs

Zeng

Chen

et al. 2020

Structural Concrete

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Debonding issues in the externally bonded (EB) CFRP sheets (or near‐surface mounted [NSM] CFRP bars) and space requirements of edge and spacing clearances for NSM CFRP bars (or the prestressed steel wire ropes [P‐SWRs]) have limited the applications of these strengthening techniques. The combination of these techniques may overcome the drawbacks of each technique and was experimentally and analytically investigated in this paper. Test results demonstrated that the flexural performances of the combinedly strengthened beam are between the flexural performances of the beams strengthened with the corresponding individual strengthening techniques. It is found the combination of the three techniques successfully prevented debonding issues which often occur in EB or NSM techniques and improved the spacing and edge clearances which are necessary for NSM and P‐SWRs techniques. In addition, the combination was demonstrated as effective to limit the crack development and improve the ductility of the strengthened beams.

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\frac{x}{h - a_{st}} \leq \min ((),, \frac{β_{1}}{1 + \frac{f_{y}}{E_{normals} ε_{cu}}}, \frac{β_{1}}{1 + \frac{0.002}{ε_{cu}} + \frac{f_{yp} - E_{sp} ε_{sp 0}}{E_{sp} ε_{cu}}})

…”

Section: Theoretical Analysismentioning

confidence: 99%

Strengthening of RC beams using the combination of EB CFRP sheet, NSM CFRP bar and P‐SWRs

Zeng

Chen

et al. 2020

Structural Concrete

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“…In achieving excellent mechanical properties, PUC with a density no than less 1,400kg/m 3 , was used to strengthen the beam. In the flexural loading process, the same density of PUC showed the same elastic stress-strain curve until the material was damaged.…”

Section: Materials Characteristicsmentioning

confidence: 99%

“…(3). The density of PUC mixed in the construction site was 1,458 kg/m 3 . The blending stress-strain cure of the PUC in the construction site is shown in Fig.…”

Section: Materials Characteristicsmentioning

confidence: 99%

“…To improve the working ability of concrete bridges, many techniques have been used in strengthening. The most common methods for strengthening beams have been the use of Carbon Fibre Reinforced Polymer (CFRP), steel plate bonding, external pre-stressing reinforcement and others, these methods are widely used at present [3]. CFRP materials have good structural performance, high strength and light weight.…”

Section: Introductionmentioning

confidence: 99%

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Strengthening of a Reinforced Concrete Bridge with Polyurethane-cement Composite (PUC)

Zhang¹,

Sun²

2016

TOCIEJ

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This paper describes a new material, polyurethane-cement composite (PUC), used to strengthen a 29-year-old reinforced T-beam bridge in Harbin, China. Polyurethane-cement composite (PUC) is mixed with polyurethane raw material and cement. This technique is completed by pouring Polyurethane-cement composite (PUC) into the template. Ultimate bearing capacity of the bridge after reinforcement was discussed based on the concrete structure theory. The flexural strength of reinforced concrete T-beam bridges strengthened with Polyurethane-cement composite (PUC) was controlled by the design flexural strength of Polyurethane-cement composite (PUC). The main construction process was introduced which included concrete surface treatment, installing template and pouring. To investigate the feasibility of the strengthening method, load tests were conducted before and after strengthening. The results of concrete strain and deflection show that the capacity of the repaired bridge, including the bending strength and stiffness, is enhanced. The crack width measurement also indicates that this technique could increase the durability of the bridge. Thus, this strengthened technique with polyurethane-cement composite (PUC) is feasible, the bridge load posting possibly is removed through this technique.

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“…Recently, the prestressed steel wire ropes (P-SWRs) has been demonstrated to be feasible and effective in strengthening RC structures (Kim et al, 2007;Wu et al, 2010Wu et al, , 2014. The steel wire ropes (SWRs) exhibit excellent mechanical properties such as light weight, high strength, low relaxation, and good flexibility.…”

Section: Introductionmentioning

confidence: 99%

Comparative study on the flexural strengthening of RC beams using EB CFRP sheets, NSM CFRP bars, P-SWRs, and their combinations

Zeng

Ahmed

et al. 2020

Advances in Structural Engineering

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The externally bonded (EB) carbon fiber reinforced polymer (CFRP), near-surface-mounted (NSM) CFRP and the prestressed steel wire ropes (P-SWRs) has been proven to be feasible and reliable flexural strengthening methods for concrete structures. However, debonding issues in EB CFRP sheets (or NSM CFRP bars) and space requirements for edge and spacing clearance of NSM CFRP bars (or P-SWRs) has limited the application of these three strengthening techniques. Therefore, the combinations of these methods need to be investigated and clarified. In this paper, experimental investigations on the flexural performances of seven concrete beams are presented, in which three of the beams were separately strengthened with EB CFRP sheets, NSM CFRP bars, and P-SWRs, respectively, and three of the beams were combinedly strengthened with two of the three techniques. Test results demonstrated that the flexural performances of beams strengthened with the combination with EB CFRP sheets, NSM CFRP bars, and P-SWRs are between the flexural performances of the beams strengthened with the corresponding individual strengthening techniques. It is found that the P-SWRs is favorable for combinations. In case the P-SWRs was combined with EB CFRP sheets or NSM CFRP bars for strengthening, the cracking load was increased to more than 230% and the maximum ultimate load-bearing capacity was increased to 150% when compared with the control beam. The debonding which occurred more or less in the beams strengthened with EB CFRP sheets or NSM CFRP bars or their combination was successfully eliminated by using the combination strengthening technique with P-SWRs. Also, the combination of P-SWRs with EB CFRP sheets or NSM CFRP bars is also favorable to improve the ductility of strengthened beams.

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Flexural strengthening of RC beams using distributed prestressed high strength steel wire rope: theoretical analysis

Cited by 13 publications

References 11 publications

Strengthening of RC beams using the combination of EB CFRP sheet, NSM CFRP bar and P‐SWRs

Strengthening of RC beams using the combination of EB CFRP sheet, NSM CFRP bar and P‐SWRs

Strengthening of a Reinforced Concrete Bridge with Polyurethane-cement Composite (PUC)

Comparative study on the flexural strengthening of RC beams using EB CFRP sheets, NSM CFRP bars, P-SWRs, and their combinations

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