Abstract
Steel fiber-reinforced prestressed concrete (SFRPSC) members typically have high shear strength and deformation capability, compared to conventional prestressed concrete (PSC) members, due to the resistance provided by steel fibers at the crack surface after the onset of diagonal cracking. In this study, shear tests were conducted on the SFRPSC members with the test variables of concrete compressive strength, fiber volume fraction, and prestressing force level. Their localized behavior around the critical shear cracks was measured by a non-contact image-based displacement measurement system, and thus their shear deformation was thoroughly investigated. The tested SFRPSC members showed higher shear strengths as the concrete compressive strength or the level of prestress increased, and their stiffnesses did not change significantly, even after diagonal cracking due to the resistance of steel fibers. As the level of prestress increased, the shear deformation was contributed by the crack opening displacement more than the slip displacement. In addition, the local displacements around the shear crack progressed toward directions that differ from those expected by the principal strain angles that can be typically obtained from the average strains of the concrete element. Thus, this localized deformation characteristics around the shear cracks should be considered when measuring the local deformation of concrete elements near discrete cracks or when calculating the local stresses.
Highlights
It is generally known that prestressed concrete (PSC) members without transverse reinforcement have brittle failure modes in shear with a rapid load decrease after diagonal cracking (Hawkins and Ghosh 2006; Avendano and Bayrak 2011; Padmarajaiah and Ramaswamy 2001)
Steel fiber-reinforced prestressed concrete (SFRPSC) members have higher shear strength and deformation capability compared to conventional PSC members because of the resistance of steel fibers at the crack surface after diagonal cracking (Narayanan and Darwish 1987; Batson et al 1972; Tan et al 1996; Padmarajaiah and Ramaswamy 2004; 1)Department of Architectural Engineering, University of Seoul, Seoul 02504, Korea. *Corresponding Author; E-mail: kangkim@uos.ac.kr
Shear tests were conducted on steel fiberreinforced and/or PSC members, and their localized behavior around the critical shear cracks was systematically measured by a non-contact image-based displacement measurement system
Summary
2)Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA. 3)Department of Architecture & Architectural Engineering, Seoul National University, Seoul 08826, Korea. 4)Department of Building Engineering, Tongji University, Shanghai 200092, People’s Republic of China. 2)Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA. 3)Department of Architecture & Architectural Engineering, Seoul National University, Seoul 08826, Korea. 4)Department of Building Engineering, Tongji University, Shanghai 200092, People’s Republic of China. The shear behavior of the SFRPSC members results from very complex mechanisms, and the local behavior at the crack surface of SFRPSC beams is very difficult to understand. In order to better understand the shear behavior of SFRPSC beams by looking into both the global and local behavior, shear tests were conducted using SFRPSC members with the primary test variables of concrete compressive strength, fiber volume fraction, and prestress level. The local behavior was analyzed along with the shear behavior
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