Steel Bridge Design Handbook Design Example 2A: Two-Span Continuous Straight Composite Steel I-Girder Bridge

2015Final ReportThe previous version of this Handbook was published as FHWA-IF-12-052 and was developed to be current with the AASHTO LRFD Bridge Design Specifications, 5th Edition with the 2010 Interims. FHWA-HIF-16-002 was updated in 2015 by HDR, Inc., to be current with the AASHTO LRFD Bridge Design Specifications, 7th Edition.PDFTech ReportFHWA-HIF-16-002 - Vol. 21DTFH6114D00049Bridge designSteel bridgesGirder bridgesHandbooksSteel BridgeSteel I-GirderAASHTO LRFDMoment RedistributionCross Frame DesignUnited StatesUnited States. Federal Highway Administration. Office of Bridges and StructuresBarth, Karl E.United States. Federal Highway Administration. Office of Bridges and StructuresHDR, Inc.Federal Highway AdministrationThe purpose of this example is to illustrate the use of the American Association of State Highway and Transportation Officials (AASHTO) Load and Resistance Factor Design (LRFD) Bridge Design for the design of a continuous two span steel I-girder bridge. The design process and corresponding calculations for steel I-girders are the focus of this example, with particular emphasis placed on illustration of the optional moment redistribution procedures. All aspects of the girder design are presented, including evaluation of the following: cross-section proportion limits, constructibility, serviceability, fatigue, and strength requirements. Additionally, the weld design for the web-to-flange joint of the plate girders is demonstrated along with all applicable components of the stiffener design and cross frame member design.84