Load and Resistance Factor Design (LRFD) for Highway Bridge Superstructures – Design Examples
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2015-08-01
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Edition:Final Report
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Abstract:This document provides two comprehensive superstructure design examples for the application of Load and Resistance Factor Design (LRFD) to highway bridge design. One design example is a two-span steel plate girder bridge, and the other is a two-span prestressed concrete girder bridge with simple span prestressed girders made continuous for live load. These design examples accompany a four-day training course that presents the theory, methodology, and application for the design and analysis of both steel and concrete highway bridge superstructures. The design examples, as well as the training course, are based on the AASHTO LRFD Bridge Design Specifications, Seventh Edition, 2014, with Interim Revisions through 2015. The first design example includes a series of flowcharts that present the general design steps required for the design of a steel plate girder bridge. The flowcharts include references to the AASHTO LRFD Bridge Design Specifications, as well as accompanying notes to assist the bridge engineer in understanding the various design steps. This design example also includes six major design steps that illustrate the application of these design procedures. The six major design steps included in this design example are general information, deck design, steel girder design, splice design, miscellaneous steel design, and bearing design. The second design example also includes a series of flowcharts that present the general design steps required for the design of prestressed concrete superstructure bridges. This design example includes five major design steps. The design steps included are general information, deck design, prestressed concrete girder design, bearing design, and substructure design (integral abutment and intermediate pier and foundation design). (It should be noted that the substructure design steps are based on a previous version of AASHTO LRFD Bridge Design Specifications and have not been updated.) The design examples include references to AASHTO LRFD Bridge Design Specifications, commentary to assist the bridge engineer in understanding its application, and a variety of figures and tables to supplement the narrative and calculations
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