Table 1 Provisions for transfer length (unit: mm).
From: Transfer Lengths in Pretensioned Concrete Measured Using Various Sensing Technologies
Provisions | Abbreviation | Predictive equation | Remarks |
|---|---|---|---|
AASHTO LRFD (AASHTO 2017) | AASHTO | \(60d_{b}\) | \(d_{b}\) : strand diameter (mm) |
KDCHB2 (KRTA 2015) | KDCHB2 | ||
KDCHB1 (KRTA 2010) | KDCHB1 | \(50d_{b}\) | \(d_{b}\) : strand diameter (mm) |
ACI 318-19 (ACI Committee 318 2019) | ACI | \(\frac{{f_{se} d_{b} }}{21}\) | \(d_{b}\) : strand diameter (mm) \(f_{se}\) : effective prestress of strand (MPa) |
PCI (PCI 2017) | PCI | ||
KSCDC (KCI 2012) | KSCDC | ||
BS 8110 (BSI 1997) | BS | \(\frac{{K_{t} \varphi }}{{\sqrt {f_{ci} } }}\) | \(K_{t}\): coefficient for tendon surface condition \(\varphi\): tendon diameter (mm) \(f_{ci}\) : concrete strength at transfer (MPa) |
Eurocode 2 (CEN 2004) | EC | \(\frac{{\alpha_{1} \alpha_{2} \phi \sigma_{pm0} }}{{f_{bpt} }}\) | \(\alpha_{1}\): coefficient for speed of transfer \(\alpha_{2}\): coefficient for tendon surface condition \(\phi\): tendon diameter (mm) \(\sigma_{pm0}\): tendon stress upon transfer (MPa) \(f_{bpt}\): bond stress (MPa) |