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原文传递 Evaluation of MMFX Steel for NCDOT Concrete Bridges.

题名：	Evaluation of MMFX Steel for NCDOT Concrete Bridges.
作者：	rizkalla, s. zia, p. seliem, h. lucier, g.
关键词：	high strength steels, loads(forces), bending, reinforcement, flexure, punching, shear, state transportation departments, performance evaluation
摘要：	The new commercially available Micro-Composite Multi-Structural Formable (MMFX) steel is a high strength and highly corrosion-resistant steel. Use of MMFX steel could lead to potential savings due to its unique characteristics. Many state transportation departments have begun to use MMFX steel as a direct replacement for conventional Grade 60 steel. However, the higher strength and lack of well-defined yield point of MMFX steel alter the structural behavior of bridge decks reinforced with MMFX steel bars. Therefore, three concrete bridge decks with a span-to-depth ratio of 12.5 were tested up to failure using concentrated loads intended to simulate the effects of truck wheel loadings. The first and second bridge decks were reinforced with the same amount of MMFX and conventional Grade 60 steel, respectively. The third bridge deck was reinforced with MMFX steel reduced by 33 percent in an attempt to utilize its high strength characteristics. The results of the experimental program and the analytical modeling demonstrated that bridge decks reinforced with 33 percent less MMFX steel developed the same ultimate load-carrying capacity and deflection at service load as those reinforced with Grade 60 steel. / NOTE: Final rept. (July 2004 - Dec. 2005). / Supplementary Notes: Sponsored by North Carolina Dept. of Transportation, Raleigh. and Federal Highway Administration, Raleigh, NC. North Carolina Div. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA.
总页数：	u0717；130p
报告类型：	科技报告