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Experimental and theoretical investigation of crack width calculation methods for RC ties

Tan, Jesus Reignard Medel; Eileraas, Kristoffer; Opkvitne, Ola; Zirgulis, Giedrius; Hendriks, Max; Geiker, Mette Rica; Brekke, Dan-Evert; Kanstad, Terje
Journal article, Peer reviewed
Accepted version
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URI
http://hdl.handle.net/11250/2577297
Date
2018
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  • Institutt for konstruksjonsteknikk [2630]
  • Publikasjoner fra CRIStin - NTNU [41955]
Original version
Structural Concrete. 2018, 19 (5), 1436-1447.   10.1002/suco.201700237
Abstract
This paper theoretically and experimentally investigates the semi-empirical formulas recommended by Eurocode 2 (EC2), fib Model Code 2010 (MC2010), and Eurocode 2 with the German National Annex (DIN) for calculating crack widths in reinforced concrete. It is shown that the formulas can be derived from the principles for the idealized behavior of RC ties. However, instead of explicitly solving the resulting differential equations, the use of simplifications leads to inconsistent formulas. An experimental study was carried out involving the testing of eight RC ties to discover the modeling uncertainty of the formulas. It was found that EC2 substantially overestimated the crack widths for the RC ties. MC2010 and DIN seemed to predict the crack widths better, but gave rather a large number of nonconservative crack width predictions. These experimental results, combined with the theoretical study, suggest that a more consistent calculation model should be formulated by explicitly solving the resulting differential equation.
Publisher
Wiley
Journal
Structural Concrete

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