EXPERIMENTAL STUDY FOR THE SIZE EFFECT ON THE FLEXURAL BEHAVIOUR OF SPLWA REINFORCED CONCRETE SLABS STRENGTHENED WITH CFRP STRIPS
MUTHANNA JOURNAL OF ENGINEERING AND TECHNOLOGY (MJET)
Riadh A. Abass
Professor, Dept. of civil engineering, College of engineering, Al.Muthanna University
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Ahad Z. Hamoodi
Ass. Lecturer, Dept. of civil engineering, College of engineering, University of Basrah
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An experimental Study was conducted to investigate the size effect on the flexural behaviour of sand-porcelinite lightweight aggregate reinforced concrete one way slabs (SPLWAC OWS). In order to get a clear results, eight slabs were casted, and six of them were strengthened with carbon fibre reinforced polymer (CFRP) strips. To investigate the size effect, four slabs were of 300 mm width, 1500 mm length and 80 mm depth and the others were of 300mm width, 2000 mm length and 108 mm depth. The present study showed that the SPLWAC OWS showed a reverse size effect. The failure mode was by yield of steel for the control un-strengthened slabs, while it was by yield of steel followed by rupture of CFRP strips for the strengthened slabs. Also, the results of this study were compared with those obtained by the ACI equations. This comparison showed that the ultimate moment strength and deflection obtained by the ACI equations were always less than those obtained experimentally.
Keywords: Carbon fiber reinforced polymer strips, Sand-porcelinite lightweight aggregate
concrete One way slabs, Monotonic loading, Variable amplitude loading.