CRACKING AND DUCTILITY ANALYSIS OF STEEL FIBER REINFORCED PRESTRESSED CONCRETE BEAMS IN FLEXURE

Joshi, Suhas S and Thammishetti, Nikesh and S, Suriya Prakash and Jain, Saumitra (2018) CRACKING AND DUCTILITY ANALYSIS OF STEEL FIBER REINFORCED PRESTRESSED CONCRETE BEAMS IN FLEXURE. ACI Structural Journal, 115 (6). ISSN 0889-3241

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Abstract

The present study focuses on understanding the effect of steel-fiber dosage on cracking and ductile behavior of prestressed concrete beams (PCBs) under flexure using digital image correlation (DIC). Seven prestressed concrete beams were cast and tested under a shear span-depth ratio (a/d) of 5 to simulate the flexure/flexure-shear dominant behavior. Full field strain measurement with the DIC technique was used to understand the effectiveness of steel fibers on the crack-bridging mechanisms. Three different volumetric fiber reinforcement ratios-0.35%, 0.70%, and 1.0%-were considered. Test results revealed that the strain energy-based ductility increased with an increase in fiber dosage from 0.35% to 1.0%. Post-cracking stiffness improved by 50% due to the addition of 1.0% volume of steel-fiber dosage. DIC measurements of displacements and strains were found to be in good agreement with the conventional linear variable displacement transducer (LVDT) measurements. DIC results clearly established the effect of fibers on crack bridging and strain reduction. Concrete strains and the strain in the prestressing strand reduced due to the better crack bridging of steel fibers.

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IITH Creators:
IITH CreatorsORCiD
S, Suriya Prakashhttp://orcid.org/0000-0003-0319-1773
Item Type: Article
Uncontrolled Keywords: crack bridging, digital image correlation (DIC), ductility, prestressed concrete beams, steel fibers
Subjects: Civil Engineering
Divisions: Department of Civil Engineering
Depositing User: Team Library
Date Deposited: 08 Jan 2019 06:34
Last Modified: 15 Feb 2019 10:50
URI: http://raiith.iith.ac.in/id/eprint/4672
Publisher URL: http://doi.org/10.14359/51706827
OA policy: http://www.sherpa.ac.uk/romeo/issn/0889-3241/
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