In accordance with the burden and resistance issue layout philosophy (LRFD), this e-book is the results of a five-year learn attempt below AASHTO's nationwide Cooperative road examine software (NCHRP) undertaking 12-42, and a persevered attempt via AASHTO technical committees. This significant step in greater bridge layout and extra exact research is anticipated to steer to bridges showing more desirable serviceability, more desirable long term maintainability, and extra uniform degrees of defense. because the First variation used to be released in 1994, the provisions have persevered to be up-to-date and more desirable in keeping with carrying on with examine and the adventure of the person group. the recent requisites were systematically demonstrated in trial designs and feature now been carried out via all 50 states, with forty eight states absolutely applied.
integrated during this digital variation are the 2008 and 2009 period in-between Revisions. Following each one bankruptcy the revisions are pointed out in addition to associated through the complete publication the place to be had. See the replaced and Deleted Articles sections for an entire checklist of adjustments to every part.
Preface and Abbreviated desk of Contents
desk of Contents
replaced and Deleted Articles, 2007
replaced and Deleted Articles, 2008
replaced and Deleted Articles, 2009
Section 1. Introduction
Section 2. basic layout and site Features
Section three. rather a lot and cargo Factors
Section four. Structural research and Evaluation
Section five. Concrete Structures
Section 6. metal Structures
Section 7. Aluminum Structures
Section eight. wooden Structures
Section nine. Decks and Deck Systems
Section 10. Foundations
Section eleven. Abutments, Piers, and Walls
Section 12. Buried buildings and Tunnel Liners
Section thirteen. Railings
Section 14. Joints and Bearings
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Extra resources for AASHTO LRFD Bridge Design Specifications, Customary U.S. Units with 2008 and 2009 U.S. Edition Interim Revisions
Where bridges are subject to inundation, provide for overtopping of roadway approach sections, and streamline the superstructure to minimize the area subject to hydraulic loads and the collection of ice, © 2012 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law. SECTION 2: GENERAL DESIGN AND LOCATION FEATURES 2-21 debris, and drifts. Utilize relief bridges, guide banks, dikes, and other river training devices to reduce the turbulence and hydraulic forces acting at the bridge abutments.
Duplication is a violation of applicable law. 10 in. 10-in. relative deflection limitation is tentative. , may be considered in the absence of other criteria. 3-1 shall be taken to apply to overall depth unless noted. 3 are used in regions of negative flexure. 3-1 with some modifications. A larger preferred minimum girder depth is specified for curved steel girders to reflect the fact that the outermost curved girder receives a disproportionate share of the load and needs to be stiffer. In curved skewed bridges, crossframe forces are directly related to the relative girder deflections.
2012 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law. 1 Bridges should be designed to avoid undesirable structural or psychological effects due to their deformations. While deflection and depth limitations are made optional, except for orthotropic plate decks, any large deviation from past successful practice regarding slenderness and deflections should be cause for review of the design to determine that it will perform adequately.
AASHTO LRFD Bridge Design Specifications, Customary U.S. Units with 2008 and 2009 U.S. Edition Interim Revisions