Design of Concrete Bridge Beams Prestressed with CFRP Systems (2019) / Chapter Skim
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56 4.1 Prestressing CFRP Characteristics 4.1.1 Tensile Strength and Strain The tensile strength used in design ( fpu) is a characteristic value computed according to ASTM D7290 (2017)
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Research Findings and Products 57 * Extreme case refers to the occurrence of service load on a cracked girder.
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58 Design of Concrete Bridge Beams Prestressed with CFRP Systems test data that may not represent the long-term behavior of the materials. The creep rupture limit of the CFRP reported in the literature ranges from 70% to 93% of the ultimate tensile strength.
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Research Findings and Products 59 For pretensioning with 0.6 in. diameter CFRP cables: 0.019 0.0066 log 24 (Eq.
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60 Design of Concrete Bridge Beams Prestressed with CFRP Systems 4.4 Flexural Design 4.4.1 Prestressed Beams with Bonded Prestressing CFRP Failure of bonded CFRP prestressed beams may result from the rupture of prestressing CFRP if r > rb or crushing of concrete if r > rb. When failure is initiated by concrete crushing, the concrete strain will reach the ultimate strain ecu of 0.003; and therefore the stress-block factors from AASHTO LRFD (2017)
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Research Findings and Products 61 where 1.5W = L d u ps for one-point loading 3.0= L dps for third-point or uniformly distributed loading This equation was also adopted by ACI 440.4R-04 (2011) , SIMTReC Manual No.
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62 Design of Concrete Bridge Beams Prestressed with CFRP Systems of failure. The resistance factor provision for concrete crushing of 0.75 also applies to fully unbonded CFRP because failure of the beams results from concrete crushing.
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