United States Department of Transportation
i
High skew link slab bridge system with deck sliding over backwall or backwall sliding over abutments : appendices.
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2011-09-01
[PDF-2.73 MB]
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Edition:Appendices.
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Abstract:AASHTO LRFD (2010) requires combined live and thermal load effects for the service
limit state design. The Design Procedure described in the appendix will follow the
rationale developed by Ulku et al. (2009). Link slab design moments are calculated using
the girder end rotations. HL-93 loading is used to calculate the girder end rotations under
live load. Girder end rotations caused by the temperature gradient are calculated using
the procedure described by Saadeghvaziri and Hadidi (2002) by ensuring strain and
curvature compatibility among sections and reinforcements.
One major improvement in the process presented in this appendix compared to what is
given in Ulku et al. (2009) is the inclusion of 3D and skew effects to calculate the
resultant link slab design moments and forces.
In order to apply loading, the first step is to establish a composite girder-deck crosssection
with an effective width as per AASHTO LRFD (2010) Section 4.6.2.6, the
composite moment of inertia, and the modulus of elasticity for concrete.
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