Modified Frosch Crack Width Model for Concrete Beams Prestressed with Cfrp Bars

Selvachandran, P.; Anandakumar, S.; Muthuramu, K.L.

doi:10.1177/096739111602400719

Cited by 3 publications

(2 citation statements)

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“…Data on cracking of CFRP [20] and steelreinforced beams [4] are compared to values predicted by Equation 4, which led to samples of C, as shown in Tables 7 and 8. Even though the data is not enough to define the probability density function of C, the uniform distribution is the one best fitting.…”

Section: Design Proceduresmentioning

confidence: 99%

Reliability analysis of concrete beams reinforced with carbon fiber-reinforced polymer bars

Barbosa¹

2019

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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Reinforced concrete structures may have their service life considerably reduced due to steel corrosion. As an alternative to provide durability at low maintenance costs, carbon fiberreinforced polymer (CFRP) bars are used instead of steel. The purpose of this paper is to calculate the CFRP reinforcement of nine residential building beams according to the provisions of ACI 440 1R-06 and subsequently, to perform a reliability analysis with reference to the ultimate and service limit states. The same elements are also designed considering steel reinforcement in order to compare the results for both types of materials. Once designed to fail due to concrete crushing, the reliability analysis of all beams is performed utilizing the program Strand© -Structural Risk and Analysis, which, through the First Order Reliability Model (FORM) and Monte Carlo Simulation, computes the reliability indexes, probabilities of failure and sensitivity factors. The material properties, applied loads and dimensions are treated as random variables with different statistical distributions provided by the literature, while the fracture modes are described by two limit state equations, accounting for bending and shear. Similarly, the noncompliance of serviceability requirements is modeled considering the direct method to compute deflections, the Frosch Equation for cracking, as well as the maximum crack width and deflections allowed by the ACI 440 1R-06 guideline. The results showed that the probabilities of failure due to bending and shear are on average higher for the CFRP reinforced beams. They are more likely to exhibit excessive deflections; however, crack widths hardly exceed the permissible limit of 0.7 mm. In general, the variables that most contributed to failure were the concrete compressive strength, CFRP Young Modulus, position of reinforcement and model uncertainty for cracking.

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Section: Design Proceduresmentioning

confidence: 99%

Reliability analysis of concrete beams reinforced with carbon fiber-reinforced polymer bars

Barbosa¹

2019

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures

View full text Add to dashboard Cite

show abstract

“…Fibre-reinforced polymer (FRP) composites have been shown to inhibit crack generation and development, structural reinforcement, and material corrosion resistance [23][24][25][26][27][28]. To promote the application of SRC structures in China, a prestressed steel reinforced concrete (PSRC) structure with CFRP prestressed tendons was proposed by the authors as an alternative to the SRC columns (Fig.…”

Section: Introductionmentioning

confidence: 99%