In keeping with the weight and resistance issue layout philosophy (LRFD), this publication is the results of a five-year study attempt below AASHTO's nationwide Cooperative road learn software (NCHRP) undertaking 12-42, and a endured attempt via AASHTO technical committees. This significant step in more desirable bridge layout and extra exact research is predicted to guide to bridges displaying stronger serviceability, greater long term maintainability, and extra uniform degrees of protection. because the First version used to be released in 1994, the provisions have persisted to be up to date and stronger according to carrying on with learn and the adventure of the person neighborhood. the recent necessities were systematically demonstrated in trial designs and feature now been applied by way of all 50 states, with forty eight states absolutely applied.
integrated during this digital variation are the 2008 and 2009 period in-between Revisions. Following every one bankruptcy the revisions are pointed out in addition to associated during the complete e-book the place to be had. See the replaced and Deleted Articles sections for an entire checklist of alterations 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. normal layout and placement Features
Section three. lots 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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Additional resources for AASHTO LRFD Bridge Design Specifications, Customary U.S. Units with 2008 and 2009 U.S. Edition Interim Revisions
Where practical, limit the number of piers in the channel, streamline pier shapes, and align piers with the direction of flood flows. Avoid pier types that collect ice and debris. Locate piers beyond the immediate vicinity of stream banks. , spanning wetlands. --`,```,`,``,`,```,,`,,`````,-`-`,,`,,`,`,,`--- Design piers on floodplains as river piers. Locate their foundations at the appropriate depth if there is a likelihood that the stream channel will shift during the life of the structure or that channel cutoffs are likely to occur.
Areas around bearing seats and under deck joints should be designed to facilitate jacking, cleaning, repair, and replacement of bearings and joints. 3. Inaccessible cavities and corners should be avoided. Cavities that may invite human or animal inhabitants shall either be avoided or made secure. 4—Rideability --`,```,`,``,`,```,,`,,`````,-`-`,,`,,`,`,,`--- The deck of the bridge shall be designed to permit the smooth movement of traffic. On paved roads, a structural transition slab should be located between the approach roadway and the abutment of the bridge.
5—Roadway Approaches to Bridge The design of the bridge shall be coordinated with the design of the roadway approaches to the bridge on the floodplain so that the entire flood flow pattern is developed and analyzed as a single, interrelated entity. Where roadway approaches on the floodplain obstruct overbank flow, the highway segment within the floodplain limits shall be designed to minimize flood hazards. Where diversion of flow to another watershed occurs as a result of backwater and obstruction of flood flows, an evaluation of the design shall be carried out to ensure compliance with legal requirements in regard to flood hazards in the other watershed.
AASHTO LRFD Bridge Design Specifications, Customary U.S. Units with 2008 and 2009 U.S. Edition Interim Revisions