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_aMendoza-Kalaw, Alma.
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_aLoad and resistance factor design of Steel Truss Superstructure Bridge /
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_cAlma Mendoza-Kalaw.
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_axi, 241 pages
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_aThesis (M.A.) -- Pamantasan ng Lungsod ng Maynila, 2006.;A directed study presented to the faculty of Graduate School of Engineering in partial fulfillment of the requirements for the degree Master of Engineering (MEng) with specialization in Structural Engineering.
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_aABSTRACT: This directed study aims to develop a step-by-step design procedure of a Steel Truss Superstructure Bridge using the provisions of the American Association of State Highway and Transportation Officials (AASHTO) Load and Resistance Factor Design (LRFD) Bridge Design Specifications, 2nd Edition 1998, and 2001 Interim Provisions, which shall be simply referred to as the AASHTO LRFD Code. The design procedures will serve as reference material for bridge engineers, instructors and students. The provisions of the AASHTO LRFD Code were properly reviewed and evaluated, specifically the provisions under the Steel Truss Bridge Superstructure and was applied in actual design. This design process is iterative in nature. Therefore, the use of an excel program is highly advantageous. The excel program created offers a degree of flexibility since it covers variations in loadings, spans, sections, material properties and others. Since it is easy to follow, it can be used as a ready reference. The AASHTO LRFD method has taken advantage of the additional moments that the section could develop beyond the yield moment. This is one of the indicating factors that the AASHTO LRFD Code are more economical to use rather than Service Load Design (SLD) which is commonly used by engineers in our country today. Through the use of an Excel program, the design optimizes the best possible steel section, which takes place in a fast, accurate and efficient manner. The design procedure integrated in the Excel program can help investigate the steel section to achieve the best section that will meet the requirements of AASHTO LRFD Bridge Code. This study is very timely since the Association of Structural Engineers of the Philippines (ASEP) plans to adopt the AASHTO LRFD Code. The upcoming NSCP Volume 2 for bridges will soon be released. As such, there is an urgent need for bridge engineers to familiarize themselves with this new AASHTO LRFD Code. Moreover, many studies were made which prove that the use of the AASHTO LRFD Code is more economical versus the Service Load Design Method.
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