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原文传递 Development of design guidelines for ledges of L-shaped beams

题名：	Development of design guidelines for ledges of L-shaped beams
其他题名：	1.Nafadi,M.K.,O.M.Khalafalla,G.W.Lucier,S.H.Rizkalla,P.Z.Zia,and G.J.Klein."Ledge Behavior and Strength of Short-Span L-Shaped Beams."PCI Journal 63(2):67-86.
正文语种：	英文
作者：	Mohamed K. Nafadi
关键词：	Global stress;ledge;ledge capacity;L-shaped beam;punching shear;spandrel
摘要：	The design procedure presented in the seventh edition of the PCI Design Handbook: Precast and Prestressed Concrete for ledges of L-shaped beams has been called into question by many engineers and researchers. Research findings from previous experimental studies have indicated that the PCI ledge design equations can overestimate ledge punching shear strength. This paper presents the development of the design procedure for the eighth edition of the PCI Design Handbook to evaluate the punching shear strength of ledges of L-shaped beams. Based on the failure surfaces observed throughout a comprehensive experimental program, an idealized failure surface was determined. The results of extensive finite element analyses and a large experimental program were used to evaluate the effects of global stress on ledge capacity, and a procedure to evaluate the punching shear strength of the ledge was developed. The proposed procedure is presented in this paper and is intended to provide an improved margin of safety for ledge capacity under a wide range of loading conditions. Consideration was given to ensure simplicity and practicality of the proposed design procedure.
出版年：	2018
论文唯一标识：	J-30Y2018V63N02024
英文栏目名称：	Parking Structures
期刊名称：	PCI-Prestressed Concrete Institute Journal
拼音刊名(出版物代码)：	J-30
卷：	63
期：	02
页码：	32-43