Abstract
Current Canadian Highway Bridge Design Code includes design provisions to establish live load demands in (i) reinforced concrete decks over longitudinal girders, (ii) orthotropic deck over longitudinal girders, and (iii) orthotropic deck over transverse beams. However, it only provides an equation for factored applied moment on concrete deck under single point load. Similar equations for orthotropic decks are as yet unavailable. As such, parametric study was conducted to lead to new empirical expressions for moment in bridge decks subjected to truck wheel loading considering each of the three cases of orthotropy: (i) relatively torsionally stiff, flexurally soft decks; (ii) relatively uniformly thick decks; and (iii) relatively torsionally soft, flexurally stiff decks. Using the proposed formulations, bridge deck design can be treated in a unified way across different deck types, accounting for longitudinal-transverse flexural rigidity of decks. Application of these methods can significantly simplify the analysis of decks and allow bridge engineers to make comparisons across different deck design alternatives.
Highlights
Since the main common property between all types of bridge decks is. their orthotropic properties. This can be the bases of a unified approach
Where, L is the span length from center-center of supports, C is continuity factor (1) for supported (0.8) for continuous spans, D is Dx/Dy, Dx is the flexural rigidity of deck in main bar direction and Dy is flexural rigidity of deck perpendicular to main bar directions. (AASHTO LRFD Bridge Design Specifications, 2014)
The current provisions in the Canadian Highway Bridge Design Code "CHBDC"(2014), does not include a comprehensive method of analysis for bridge decks under live load except for section 5.7.1.7 which discusses the simplified elastic method for concrete deck slabs supported on longitudinal girders and still grid decks
Summary
Many different types of bridge decks are being deployed and constructed. These types of decks include conventional slab on girder and combination of grid work of steel elements filled with concrete. The diversity of types of bridge decks provides both designers and contractors with a variety of tools to optimize design and construction. While the diversity of bridge decks has many benefits yet the lack of simple unified methodology of analysis is major drawback. The urge for a unified methodology of analysis that combines all bridge decks under a single formula is vital. Since the main common property between all types of bridge decks is.
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