Aashto Standard Specifications 17th Edition

[Tony Phan]

Thesespecifications are intended to serve as a standard or guide for the preparation of State specifications and for reference by bridge engineers. Primarily, the specifications set forth minimum requirements which are consistent with current practice, and certain modifications may be necessary to suit local conditions. They apply to ordinary highway bridges and supplemental specifications may be required for unusual types and for bridges with spans longer than 500 ft. The specifications are presented in three divisions: (I) Design; (I-A) Seismic Design; and (II) Construction. Interim Specifications of 1997, 1998, 1999, 2000, 2001, 2002 and 2003 have been adopted and are included. Commentaries from 1996 through 2000 are provided and have been cross-referenced with each other, where appropriate. A new companion CD-ROM with advance search features is included with each book. The Federal Highway Administration and the States have established a goal that the Load and Resistance Factor Design (LRFD) standards be used on all new bridge designs after 2007; only edits related to technical errors in the seventeenth edition will be made hereafter. These Standard Specifications are applicable to new structure designs prior to 2007 and for the maintenance and rehabilitation of existing structures.

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To designate those standards, policies, and standard specifications that are acceptable to the Federal Highway Administration (FHWA) for application in the geometric and structural design of highways.

This document provides the preface and introduction to the 17th edition of the Standard Specifications for Highway Bridges published in 2002 by the American Association of State Highway and Transportation Officials (AASHTO). The preface outlines the major changes between this edition and the previous, including new interim specifications adopted and reorganization of some sections. The introduction provides background on the development and purpose of the specifications, which are intended to serve as standards and guides for state transportation departments and bridge engineers, with some modifications allowed to suit local conditions.Read less

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BGS Version 8.1, the initial release of BGS (June 2007), was developed from TxDOT Roadway Design System (RDS) Version 8.0 by removing all non-bridge related RDS commands. The result of these changes to RDS is BGS, a "scaled down" implementation of TxDOT RDS that focuses on bridge geometrics. BGS v8.1.7.2 was deployed in November of 2011 as a technical release to address OS issues with v8.1.7 (i.e. 8.1) released June 2007.

BGS, Version 9.1 includes a large number of fixes to bugs reported since the release of BGS Version 8.1 as well as enhancements to address user's concerns, including reducing system limitations on numbers such as the number of diaphragm lines that could be defined. Such limitation existed since long before the release of RDS Version 8.0. For a complete listing of the changes made to BGS Version 8.1 to yield BGS Version 9.1, see the Release Notes for BGS Version 9.1 installed with the software. This software product was developed by TxDOT for the use of TxDOT engineers and consultants and is maintained by the Texas Department of Transportation.

The current draft of the BGS v9.1 User Guide is over 360 pages long. Due to file size and for other reasons it is not deployed directly to the end user's machine but is rather stored on TxDOT_s FTP server. Users can access the guide via a link to it installed in the Bridge Geometry System (BGS) program group. This decoupling of the BGS User Guide from the packaging of the software allows for revision on an as-needed basis throughout the life of BGS v9.1. This BGS User Guide, like the old RDS User Manual, should provide all the information that the user will need to run the software.

See the BGS Support Information document, linked in the same manner as the BGS User Guide, for instructions on how to report bugs and wishes about program functionality or get technical support. Technical support is available to all TxDOT BGS users and any consultant BGS users designing bridges for TxDOT.

IMPORTANT NOTE: This 2/20/2020 release of BGS, Version 9.1.6 is a technical release intended to address Windows 10 compatibility and the false positives for malware by malware scanning software issues. The false positive for malware issue has persisted since shortly after the 02/12/2016 posting of BGS 9.1.6, as malware detection software began becoming increasingly more sensitive. The repackaging of the installer includes revised names and content for some documentation. The functionality of the compiled elements of the BGS software have not changed, hence the compile program version remains 9.1.6.

BridgeLink has been collaboratively developed and maintained by the Washington State Department of Transportation (WSDOT) and the Texas Department of Transportation (TxDOT) under the Alternate Route Project initiated and managed by WSDOT. ( )

BridgeLink User Guide (March 2020)

This TxDOT-customized version of PGSuper is versatile, user friendly, Windows-based software for the design, analysis, and load rating of multi-span precast-prestressed concrete bridge beams/girders in accordance with the AASHTO LRFD Bridge Design Specifications (thru the 9th Edition, 2020) and by TxDOT design policies and guidelines. Properties of TxDOT standard I-girders (TxGirders), U beams, slab beams, decked slab beams, box beams, and X-beams and TxDOT specific design criteria are included in templates and libraries published by TxDOT on a server accessible via the Internet. Thus, the software is capable of periodically updating the installed templates and libraries with the most current versions published by TxDOT. Though these templates and libraries are subject to change, the user may save PGSuper project data with its associated templates, libraries and settings in a .pgs file which can subsequently be opened by PGSuper preserving the templates, libraries, settings and design data of the bridges as originally designed.

Custom defined beam shapes that fit within each family of girder types supported by PGSuper can also be added to the user copy of the templates, thereby extending the girder shapes that the user can design, analyze, and load rate with the program.

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