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Author: Thomas Thaxton Baber Publisher: ISBN: Category : Bridges Languages : en Pages : 88
Book Description
The Commonwealth of Virginia is currently transitioning from the long-used AASHTO Allowable Stress Design (ASD) specification to AASHTO's Load and Resistance Factor Design (LRFD) specification. The new specification features revised live loads, more conservative impact factors, a new load distribution method for analysis, and a probabilistically based limit state design approach. Traditional deflection limits have been made optional in the LRFD format. The extensive changes in the specification make it unclear as to whether bridges designed using the LRFD specification will be more or less flexible than those designed using the ASD specification. A series of bridges were designed using both ASD and LRFD formats to investigate what, if any, significant changes in bridge flexibility might be encountered and whether deflection limits are more or less likely to be violated with the LRFD format. Based upon the design of six single-span bridges with varying spans and numbers of girders, and a partial design of a three-span continuous bridge, it was concluded that the LRFD designs tend to be lighter and more economical in general and also tend to be more flexible than ASD designs of the same bridge. The weight savings appears to be more pronounced on single-span bridges than on multiple-span bridges because of the greater significance of local and lateral stability concerns in the finished bridges for multi-span bridges.
Author: Thomas Thaxton Baber Publisher: ISBN: Category : Bridges Languages : en Pages : 88
Book Description
The Commonwealth of Virginia is currently transitioning from the long-used AASHTO Allowable Stress Design (ASD) specification to AASHTO's Load and Resistance Factor Design (LRFD) specification. The new specification features revised live loads, more conservative impact factors, a new load distribution method for analysis, and a probabilistically based limit state design approach. Traditional deflection limits have been made optional in the LRFD format. The extensive changes in the specification make it unclear as to whether bridges designed using the LRFD specification will be more or less flexible than those designed using the ASD specification. A series of bridges were designed using both ASD and LRFD formats to investigate what, if any, significant changes in bridge flexibility might be encountered and whether deflection limits are more or less likely to be violated with the LRFD format. Based upon the design of six single-span bridges with varying spans and numbers of girders, and a partial design of a three-span continuous bridge, it was concluded that the LRFD designs tend to be lighter and more economical in general and also tend to be more flexible than ASD designs of the same bridge. The weight savings appears to be more pronounced on single-span bridges than on multiple-span bridges because of the greater significance of local and lateral stability concerns in the finished bridges for multi-span bridges.
Author: Thomas Thaxton Baber Publisher: ISBN: Category : Bridges Languages : en Pages : 88
Book Description
The Commonwealth of Virginia is currently transitioning from the long-used AASHTO Allowable Stress Design (ASD) specification to AASHTO's Load and Resistance Factor Design (LRFD) specification. The new specification features revised live loads, more conservative impact factors, a new load distribution method for analysis, and a probabilistically based limit state design approach. Traditional deflection limits have been made optional in the LRFD format. The extensive changes in the specification make it unclear as to whether bridges designed using the LRFD specification will be more or less flexible than those designed using the ASD specification. A series of bridges were designed using both ASD and LRFD formats to investigate what, if any, significant changes in bridge flexibility might be encountered and whether deflection limits are more or less likely to be violated with the LRFD format. Based upon the design of six single-span bridges with varying spans and numbers of girders, and a partial design of a three-span continuous bridge, it was concluded that the LRFD designs tend to be lighter and more economical in general and also tend to be more flexible than ASD designs of the same bridge. The weight savings appears to be more pronounced on single-span bridges than on multiple-span bridges because of the greater significance of local and lateral stability concerns in the finished bridges for multi-span bridges.
Author: Publisher: AASHTO ISBN: 156051521X Category : Bridges Languages : en Pages : 271
Book Description
This work offers guidance on bridge design for extreme events induced by human beings. This document provides the designer with information on the response of concrete bridge columns subjected to blast loads as well as blast-resistant design and detailing guidelines and analytical models of blast load distribution. The content of this guideline should be considered in situations where resisting blast loads is deemed warranted by the owner or designer.
Author: American Association of State Highway and Transportation Officials Publisher: AASHTO ISBN: 1560514698 Category : Bridges Languages : en Pages : 38
Author: Sreenivas Alampalli Publisher: CRC Press ISBN: 9781566769495 Category : Technology & Engineering Languages : en Pages : 458
Book Description
The fourth Structural Materials Technology NDT Conference was held in Atlantic City, New Jersey, with over sixty speakers presenting on a wide variety of topics. The goal of this conference was to inform engineers and researchers of the new nondestructive testing/nondestructive evaluation (NDT/NDE) technologies and techniques available for use in transportation construction. The use of alternative materials is challenging NDT/NDE professionals to develop new methods or modify existing techniques to address quality control, quality assurance, and long-term monitoring of structures built or strengthened with these materials. One such alternative is fiber-reinforced polymer (FRP) products. This conference included papers on this topic and a panel discussion that focused on the future of NDT/NDE technologies for structures built or rehabilitated with FRP composites. These proceedings contain the 62 papers that were presented at the conference, arranged according to session number. An author index is included.
Author: M. Lee Marsh Publisher: Transportation Research Board ISBN: 0309223806 Category : Technology & Engineering Languages : en Pages : 138
Book Description
"TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 440, Performance-Based Seismic Bridge Design (PBSD) summarizes the current state of knowledge and practice for PBSD. PBSD is the process that links decision making for facility design with seismic input, facility response, and potential facility damage. The goal of PBSD is to provide decision makers and stakeholders with data that will enable them to allocate resources for construction based on levels of desired seismic performance"--Publisher's description.
Author: Richard M. Barker Publisher: John Wiley & Sons ISBN: 1118330102 Category : Technology & Engineering Languages : en Pages : 1194
Book Description
Up-to-date coverage of bridge design and analysis revised to reflect the fifth edition of the AASHTO LRFD specifications Design of Highway Bridges, Third Edition offers detailed coverage of engineering basics for the design of short- and medium-span bridges. Revised to conform with the latest fifth edition of the American Association of State Highway and Transportation Officials (AASHTO) LRFD Bridge Design Specifications, it is an excellent engineering resource for both professionals and students. This updated edition has been reorganized throughout, spreading the material into twenty shorter, more focused chapters that make information even easier to find and navigate. It also features: Expanded coverage of computer modeling, calibration of service limit states, rigid method system analysis, and concrete shear Information on key bridge types, selection principles, and aesthetic issues Dozens of worked problems that allow techniques to be applied to real-world problems and design specifications A new color insert of bridge photographs, including examples of historical and aesthetic significance New coverage of the "green" aspects of recycled steel Selected references for further study From gaining a quick familiarity with the AASHTO LRFD specifications to seeking broader guidance on highway bridge design Design of Highway Bridges is the one-stop, ready reference that puts information at your fingertips, while also serving as an excellent study guide and reference for the U.S. Professional Engineering Examination.
Author: American Concrete Institute. Convention Publisher: ISBN: Category : Architecture Languages : en Pages : 264
Book Description
"Prepared by members of ACI Subcommittee 445-1, Strut and Tie Models, for sessions at the Fall Convention in Phoenix, October 27 to November 1, 2002, and sponsored by Joint ACI-ASCE Committee 445, Shear and Torsion and ACI Committee 318-E, Shear and Torsion."
Author: Neil Middleton Hawkins Publisher: Transportation Research Board ISBN: 0309098866 Category : Bridges Languages : en Pages : 206
Book Description
"Research sponsored by the American Association of State Highway and Transportation Officials in cooperation with the Federal Highway Administration."
Author: Thomas Thaxton Baber
Author: Thomas Thaxton Baber
Author: Thomas Thaxton Baber
Author: 
Author: 
Author: American Association of State Highway and Transportation Officials
Author: Sreenivas Alampalli
Author: M. Lee Marsh
Author: Richard M. Barker
Author: American Concrete Institute. Convention
Author: Neil Middleton Hawkins