Recommended design specifications for live load distribution to buried structures
By: D. Lee Petersen ... [et al.].
Contributors: National Research Council (U.S.). Transportation Research Board; National Cooperative Highway Research Program; American Association of State Highway and Transportation Officials; United States. Federal Highway Administration; CNA Consulting Engineers; Simpson, Gumpertz & Heger
Series: NCHRP report -- 647; Report (National Cooperative Highway Research Program) -- 647.
Publisher: Transportation Research Board
Published: 2010
Place of publication: Washington, D.C
Language: eng
Number of pages: 75
ISBN-13: 9780309118224
Subjects: Bridges; Bridge design; Highway design; Specifications; Design and construction; Culverts; Roads; Live loads
Description: This report provides recommendations to revise the AASHTO LRFD Bridge Design Specifications  relating to the distribution of live load to buried structures. The report details the development of simplified design equations (SDEs) for structural response based on three-dimensional (3D) analysis of 830 buried culverts. In addition, the report provides guidelines for conducting 2D and 3D modeling for design situations with conditions not covered by the SDEs. The material in this report will be of immediate interest to roadway and bridge designers.
Notes: At head of title: National Cooperative Highway Research Program.

Performed by CNA Consulting Engineers and Simpson Gumpertz & Heger Inc.

Includes bibliographical references (p. 75).

Also available online.

Research sponsored by the American Association of State Highway and Transportation Officials in cooperation with the Federal Highway Administration NCHRP project 15-29
Table of contents: title: Ch. 1. Introduction and Research Approach: Review and Evaluations of Relevant Experience, Soil Constitutive models and Software, 2D and 3D Modeling, Development of SDEs on Culvert Forces, Refined Analysis Guidelines; title: Ch. 2. Findings: Review and Evaluation of Relevant Experience, Selection and Development of Refined Analytical Models, Development of SDEs, Effect of SDEs on Culvert Forces, Guidelines for Use of Refined Analysis Methods; title: Ch. 3. Interpretation, Appraisal, and Applications: SDEs, Recommeded Changes to the AASHTO LRFD Bridge Design Specifications, Overall Design and Reliability Margin; title: Ch. 4. Conclusions; title: References.