These specifications 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.
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.
standard specifications for highway bridges 17th edition pdf download
CULV5 is an analysis tool for concrete box culverts. The program determines the forces acting on each of the different members of the culvert using the direct stiffness method. The user provides input data for loading conditions, structure geometry, and member sizes. The program outputs the member forces for use in either a working stress design or a load factor design in accordance with the AASHTO Standard Specifications for Highway Bridges, 17th Ed. for highway loadings, and AREMA 2006 in the case of E72 and E80 loadings.
The SignsPC application is used in conjunction with the MicroStation computer-aided drafting application. SignsPC extends MicroStation by providing the user with a toolkit for generating and labeling traffic signs. The toolkit also includes a lettering feature to accurately place lettering cells spaced according to standard specifications.
The Texas Bridge Load Rating Program (TBLRP) uses a working stress (WS) analysis method which produces an allowable stress load rating. This load rating methodology is in accordance with the AASHTO Manual for Condition Evaluation of Bridges, 1993, and the AASHTO Standard Specifications for Highway Bridges, 14th Ed., 1989. This program simplifies the load rating of nonstandard bridges that are commonly found on rural roads off the state and federal highway systems. The program emphasizes standardized and efficient load rating with a goal of minimizing clerical and computational errors inherent in manual methods.
Load distribution factors have a substantial role in the analysis and design of highway bridges. In this research, the effect of load distribution factors on the design parameters of bridge superstructures are studied by a numerical semi-continuum method. Three different case studies are carried out in the research to compare the accuracy and performance of the method. The objective of the first case is to control the outcomes of the method with the results of finite element method as well as AASHTO LRFD method. The second case is presented to study the effect of design parameters on load distribution factors between longitudinal girders through the three methods. Finally, a field test investigation is studied in the last case to compare all three methods with an actual field test study. It has been shown that the AASHTO LRFD method is not precise enough in comparison with the present method. The AASHTO LRFD formulas for live load distribution are quite unreliable and can give design parameters far too low or far too high. Moreover, minimum calculation time, convenient performance and high accuracy in the solution process are the other advantages of the method proposed in this research.
Load ratings are used in part to allocate federal funding to agencies and to plan for repairing, replacing, and rehabilitating bridges. Therefore, load ratings can affect the movement of goods throughout a region and are vitally important to the continued safe and efficient operation of the highway system.
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