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Title:

Load Combination Factors for Extreme Events

Accession Number:

01002458

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States
Order URL: http://www.trb.org/Main/Public/Blurbs/156132.aspx

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Order URL: http://worldcat.org/isbn/0309093813

Abstract:

The AASHTO load and resistance factor design (LRFD) specifications were developed with the use of a reliability-based calibration that covered the basic combination of dead load plus live load. The other load combinations were obtained from previous generations of specifications and the experience of bridge engineers and thus may not be consistent with the reliability methodology of the LRFD specifications. Work done as part of a recent NCHRP project to study in a systematic way the reliability of bridges under the combined effects of extreme load events and to develop a rational set of load combination factors consistent with the LRFD philosophy is described. The load events considered include live loads, seismic loads, wind loads, ship collision loads, and short-term scour. The analysis considered structural safety as well as foundation safety, and member safety was compared with system safety. The study recommended revisions to the AASHTO LRFD load combination factors and also calibrated new factors for combinations of events that include the presence of short-term scour. The calibration took into account previous experience with so-called safe bridge structures to provide acceptable and consistent levels of reliability.

Monograph Accession #:

01002432

Language:

English

Authors:

Ghosn, Michel

Pagination:

pp 389-397

Publication Date:

2005

Serial:

Transportation Research Record: Journal of the Transportation Research Board

Issue Number: CD 11-S
Publisher: Transportation Research Board
ISSN: 0361-1981

Conference:

6th International Bridge Engineering Conference: Reliability, Security, and Sustainability in Bridge Engineering

Location: Boston MA, United States
Date: 2005-7-17 to 2005-7-20
Sponsors: Transportation Research Board; Federal Highway Administration; American Association of State Highway and Transportation Officials (AASHTO); Massachusetts Highway Department; Texas Department of Transportation

ISBN:

0309093813

Media Type:

Digital/other

Features:

Figures (4) ; References (13) ; Tables (4)

Uncontrolled Terms:

Extreme events; Revisions

Subject Areas:

Bridges and other structures; Design; Highways; Marine Transportation; Safety and Human Factors; I24: Design of Bridges and Retaining Walls

Files:

TRIS, TRB

Created Date:

Jul 26 2005 1:32PM