详情

原文传递 REVIEW OF ALTERNATE LOAD FACTOR (AUTOSTRESS) DESIGN.

题名：	REVIEW OF ALTERNATE LOAD FACTOR (AUTOSTRESS) DESIGN.
作者：	Grubb-MA
关键词：	HIGHWAY-BRIDGES; AUTOSTRESS-DESIGN; CONTINUOUS-STEEL-BEAM-BRIDGES; COST-EFFECTIVENESS; HISTORY-; APPLICATIONS-; BENEFITS-
摘要：	Alternate load factor (Autostress) design is a limit-states design approach that was adopted by the American Association of State Highway and Transportation Officials (AASHTO) in 1986 in the form of a guide specification for the design of continuous steel-beam bridges using braced compact sections. The procedures recognize the inherent strength and ductility of continuous steel members and thus more closely approximate the way a continuous structure actually responds at higher load levels. As a result, a designer has more freedom to choose the distribution of material along the length of a member and thereby minimize fabrication costs. The procedures have evolved from a 15-yr progression of sponsored research. Presented in this summary paper is a brief overall historical review of all research to date on both compact and noncompact sections. Recent work has resulted in the development of a practical unified analysis approach that can be applied at all load levels. The approach is founded on classical indeterminate analysis theory and is readily amenable to computer programming. The current status of alternate load factor procedures is summarized. Several design applications are reviewed, and the potential for benefits in bridge rating is discussed. When eventually backed by sound quality software, these procedures may well usher in a new generation in steel-bridge design.
总页数：	Transportation Research Record. 1993. (1380) pp45-49 (30 Ref.)
报告类型：	科技报告