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Flexural behaviour of steel ﬁbre-reinforced concrete under cyclic loading

takbook
عمران
17th ژانویه 2018
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Flexural behaviour of steel ﬁbre-reinforced concrete under cyclic loading

Flexural behaviour of steel ﬁbre-reinforced concrete under cyclic loadingThis paper presents the results of cyclic loading tests on ﬁbre-reinforced concrete (FRC). The main objectiveof this research is to evaluate simultaneously the inﬂuence of the workability, the steel ﬁbres and the compressivestrength on the ﬂexural behaviour of FRC under cyclic loading. Prismatic concrete specimens havingdimensions of 150*150* 700 mm were fabricated with concrete of various workability and differentcompressive strengths (30, 60 and 80 MPa) and reinforced with hooked end steel ﬁbres of aspects ratios of65 and 80 at contents of 0.5 and 1%. A four-point bending test with notched specimens was conducted usingDigital Image Correlation technique. The orientation of the ﬁbres, failure modes,…

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Inﬂuence of ﬁbre distribution and orientation on the ﬂexural behaviour of beams cast from ﬂowable hybrid polymer–steel FRC

takbook
عمران
17th ژانویه 2018
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Inﬂuence of ﬁbre distribution and orientation on the ﬂexural behaviour of beams cast from ﬂowable hybrid polymer–steel FRC

Inﬂuence of ﬁbre distribution and orientation on the ﬂexural behaviour of beams cast from ﬂowable hybrid polymer–steel FRCabsttrract
The present study analyses the performance of full-scale beams cast from ﬂowable hybrid polymer FRCwith regard to ﬁbre distribution and orientation. To identify possible ﬂow-induced effects, variations ofthe ﬁbre contents and orientation factors were investigated along the length and over the height of thebeams. The study includes a comparison of the ﬁbre distribution and orientation between standard specimensand full-scale beams, and the inﬂuence thereof on ﬂexural behaviour and design assumptions. Forthe full-scale beams, it is found that ﬁbres, even combined, distribute differently by type: steel ﬁbres tendto segregate…

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Constitutive behaviour of conﬁned ﬁbre reinforced concrete under axial compression

takbook
عمران
17th ژانویه 2018
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Constitutive behaviour of conﬁned ﬁbre reinforced concrete under axial compression

Constitutive behaviour of conﬁned ﬁbre reinforced concrete under axial compressionAbstractSteel ﬁbre reinforced concrete is ﬁnding extensive use in ﬁeld applications. The mechanism of delaying and arresting crackpropagation by the ﬁbres can be made use in passive conﬁnement of concrete. Such concrete was termed as conﬁned ﬁber reinforcedconcrete (CFRC). This paper presents an analytical model for predicting the stress–strain behaviour of CFRC based on the experimentalresults. A total of ninety prisms of size 150 ۱۵۰ ۳۰۰ mm were cast and tested under strain control rate of loading. Theincrease in strength and strain of CFRC were used in formulating the constitutive relation. ۲۰۰۲ Elsevier Science Ltd. All rights reserved….

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