Title: Transverse post-tensioning arrangement for side-by-side box-beam bridges
Date: Spring, 2012
Volume: 57
Issue: 2
Page number: 48-63
Author(s): Nabil F. Grace, Elin A. Jensen, Mena R. Bebawy
https://doi.org/10.15554/pcij.03012012.48.63
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Abstract
While side-by-side box-beam bridges have numerous structural advantages, a serious drawback for this type of bridge is the longitudinal deck cracking over the shear keys. These cracks are observed as early as a few years after initial construction, even where transverse post-tensioning is applied. Associated distresses are well documented in the literature. Two hypotheses were established: longitudinal deck cracking in side-by-side box-beam bridges may be mitigated through an optimized transverse post-tensioning arrangement and traffic is not the sole load factor controlling longitudinal deck cracking. This broad study, encompassing field observations as well as experimental and numerical investigations, demonstrates that a transverse post-tensioning system can be determined as a function of bridge geometry such that deck cracking due to temperature and traffic loads is mitigated. The recommended transverse post-tensioning system is defined by the number of diaphragms and the force applied at each diaphragm.
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