Acceptable lower bound of the ductility index and serviceability state of RC continuous beams strengthened with CFRP sheets

Maghsoudi, Ali Akbar; Bengar, Habib Akbarzadeh

doi:10.1016/j.scient.2011.03.005

Cited by 31 publications

(12 citation statements)

References 14 publications

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“…For this study, the minimum acceptable ductility index is taken as 3.0 [37,38], which is similar to that for corresponding members reinforced with steel. As noted earlier, DHRFP bar ductility results from a sequence of non-simultaneous material failures with the condition that after a material fails, the remaining materials have the capacity to carry the tension force until the final material fails, to produce the desired ductility level in the concrete flexural member.…”

Section: Dhfrp-reinforced Flexural Member Analysismentioning

confidence: 99%

Reliability-based design optimization of concrete flexural members reinforced with ductile FRP bars

Behnam

Eamon

2013

Construction and Building Materials

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Behnam, B., and Eamon, C. (2013). "Reliability-based design optimization of concrete flexural members reinforced with ductile FRP bars." Construction and Building Materials, 47, 942-950, doi: 10.1016Materials, 47, 942-950, doi: 10. /j.conbuildmat.2013 ABSTRACTIn recent years, ductile hybrid FRP (DHFRP) bars have been developed for use as tensile reinforcement. However, initial material costs regain high, and it is difficult to simultaneously meet strength, stiffness, ductility, and reliability demands. In this study, a reliability-based design optimization (RBDO) is conducted to determine minimum cost DHFRP bar configurations while enforcing essential constraints. Applications for bridge decks and building beams are considered, with 2, 3, and 4-material bars. It was found that optimal bar configuration has little variation for the different applications, and that overall optimized bar cost decreased as the number of bar materials increased.

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Section: Dhfrp-reinforced Flexural Member Analysismentioning

confidence: 99%

Reliability-based design optimization of concrete flexural members reinforced with ductile FRP bars

Behnam

Eamon

2013

Construction and Building Materials

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“…In this study, a minimum ductility index of 3.0 is specified for flexural member performance, which represents a lower limit similar to that of many steel-reinforced sections [31,32].…”

Section: Design Constraintsmentioning

confidence: 99%

Analysis of alternative ductile fiber-reinforced polymer reinforcing bar concepts

Behnam

Eamon

2013

Journal of Composite Materials

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Steel-reinforced concrete structural components are often associated with significant maintenance costs as a result of reinforcement corrosion. To mitigate this problem, fiberreinforced polymer (FRP) bars have been used in place of traditional steel reinforcement for some applications. The non-ductile response of typical FRP bars is a concern, however. To overcome this problem, hybrid ductile FRP (HDFRP) bars have been developed for use in concrete flexural members with resulting ductility indices similar to sections reinforced with steel. In this study, five different HDFRP bar concepts are analyzed and compared in terms of ductility, stiffness, and relative cost. Of primary interest is the effect that the number of materials used in bar construction has on performance. Reinforced concrete beam and bridge deck applications are considered for analysis. It was found that all HDFRP-reinforced flexural members considered could meet code-specified strength and ductility requirements for steelreinforced sections, although service load deflections were approximately twice that of steelreinforced sections of the same depth. In general, ductility increased, and overall material cost decreased, as the bar material layers increased from 2 to 4. The 4-material continuous fiber bar approach was found to be most promising, with high ductility as well as relatively low cost.

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“…RC elements generally fail by either the crushing of compressive concrete and/or the yielding of the internal steel reinforcement. Although CFRPs have high strength, they are very brittle; when loaded in tension, FRP exhibits a linear stress-strain behavior up to failure without exhibiting a yield plateau or any indication of an impending failure [1]. High strength of FRP is generally not achieved, particularly when it is used externally for the exural strengthening of RC beams, because the FRPstrengthened members often fail due to a mechanism that is known as debonding.…”

Section: Introductionmentioning

confidence: 99%

“…Debonding can lead to premature failure of the FRP-strengthened members. These failures, such as Intermediate Crack (IC) debonding of FRP, plate end interfacial debonding of FRP, and cover separation, can signi cantly limit capacity enhancement and prevent the full ultimate exural capacity of the retro tted beams from being attained [1]. The debonding failure occurs due to initiation and propagation of debonding.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, due to the premature and brittle nature of debonding failures, proper understanding of these failures is needed to insure the safety and reliability of FRP-strengthened members. Although many experimental studies have been performed to assess the exural behavior of RC elements externally strengthened with FRP laminates and sheets under monotonic loads [1,2,[6][7][8][9][10][11][12], the ex-ural behavior of these elements under cyclic loading has rarely been examined. Moreover, the experimental tests carried out under cyclic loads have generally focused on studying fatigue phenomena; thus, they are characterized by a high number of cycles mainly within the elastic range [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Flexural performance of RC beams strengthened by bonded CFRP laminates under monotonic and cyclic loads

2016

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RC beams, strengthened by external bonded FRP reinforcement, often fail by one of several possible debonding modes. Although many experimental studies have been performed to assess the exural behavior and failure modes of FRP-strengthened RC beams under monotonic loads, the exural performance of these elements under cyclic loads have rarely been examined. The present paper illustrates the results of an experimental study aimed at better understanding of the structural behavior and debonding failure mechanisms of FRP-strengthened RC beams under monotonic and cyclic loads. This experimental research program is made of exural tests carried out on eight RC beam specimens with dimensions of 150 mm width, 200 mm height, and 1800 mm length, externally strengthened with CFRP laminates and tested under monotonic and cyclic loadings. Three specimens were considered as control specimens. The remaining ve specimens were strengthened in exure by CFRP laminates. This program investigated the structural behavior and debonding failure trends in the FRP-strengthened beams. Results of this investigation are presented in the form of load-de ection curves and FRP strain pro les.

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Acceptable lower bound of the ductility index and serviceability state of RC continuous beams strengthened with CFRP sheets

Cited by 31 publications

References 14 publications

Reliability-based design optimization of concrete flexural members reinforced with ductile FRP bars

Reliability-based design optimization of concrete flexural members reinforced with ductile FRP bars

Analysis of alternative ductile fiber-reinforced polymer reinforcing bar concepts

Flexural performance of RC beams strengthened by bonded CFRP laminates under monotonic and cyclic loads

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