Improved Live Load Deflection Criteria for Steel Bridges

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Improved Live Load Deflection Criteria for Steel Bridges

Author: National Cooperative Highway Research Program | Size: 1.01 MB | Format: PDF | Quality: Original preprint | Publisher: Transportation Research Board | Year: 2002 | pages: 147 | ISBN: -

This research examined the American Association of State Highway and Transportation Officials (AASHTO) live-load deflection limit for steel bridges. The AASHTO Standard Specification limits live-load deflections to L/800 for ordinary bridges and L/1000 for bridges in urban areas that are subject to pedestrian use. This limit is also incorporated in the AASHTO Load and Resistance Factor Design (LRFD) Specifications in the form of optional serviceability criteria. This limit has not been a controlling factor in most past bridge designs, but it will play a greater role in the design of bridges built with new high performance 70W steel. This study documented the role of the AASHTO live-load deflection limit of steel bridge design, determined whether the limit has beneficial effects on serviceability and performance, and established whether the deflection limit was needed. Limited time and funding was provided for this study, but an ultimate goal was to establish recommendations for new design provisions that would assure serviceability, good structural performance and economy in design and construction.

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