Cracking and Ductility Analysis of Steel Fiber-Reinforced Prestressed Concrete Beams in Flexure

Suhas S. Joshi, Nikesh Thammishetti, S. Suriya Prakash, Saumitra Jain
2018 ACI Structural Journal  
8 The present study focuses on understanding the effect of steel fiber dosage on cracking and 9 ductile behavior of prestressed concrete beams (PCB) under flexure using digital image 10 correlation (DIC). Seven prestressed concrete beams were cast and tested under a shear span 11 to depth (a/d) ratio of five to simulate the flexure/flexure-shear dominant behavior. Full field 12 strain measurement with DIC technique was used to understand the effectiveness of steel 13 fibers on the crack
more » ... mechanisms. Three different volumetric fiber reinforcement 14 ratios viz. 0.35%, 0.70% and 1.0% were considered. Test results revealed that the strain 15 energy based ductility increased with an increase in fiber dosage from 0.35% to 1.0%. Post-16 cracking stiffness improved by 50% due to the addition of 1.0% volume of steel fiber dosage. 17 DIC measurements of displacements and strains were found to be in good agreement with the 18 conventional linear variable displacement transducer (LVDT) measurements. DIC results 19 clearly established the effect of fibers on crack bridging and strain reduction. Concrete 20 strains and the strain in the prestressing strand reduced due to the better crack bridging of 21 steel fibers. 22 23
doi:10.14359/51706827 fatcat:h46uhuhrynampbdq3p5wcvlvga