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原文传递 Ledge behavior and strength of long-span L-shaped beams

题名：	Ledge behavior and strength of long-span L-shaped beams
其他题名：	1.PCI Industry Handbook Committee.2010.PCI Design Handbook:Precast and Prestressed Concrete.7th ed.Chicago,IL:PCI.
正文语种：	英文
作者：	Mohamed K. Nafadi
关键词：	Global stress;ledge;ledge capacity;ledge reinforcement;load;long span;L-shaped beams;punching shear;reinforcement detail;spandrel
摘要：	The ledge design procedure in the seventh edition of the PCI Design Handbook: Precast and Prestressed Concrete has been called into question by several engineers and researchers since 1985. Specifically, the ledge punching-shear capacities predicted by the PCI procedure overestimate the failure loads observed in several previous laboratory tests and analytical studies. This paper presents the results of the second phase of an extensive experimental program conducted on nine full-scale, long-span, L-shaped beams with ledge heights from 8 to 18 in. (200 to 450 mm). The main objectives of this study were to investigate the effects on ledge capacity of several significant parameters, such as global stress, prestressing, ledge height, and concrete strength. In addition, the study also investigated the efficiency of selected special reinforcement details. The experimental results demonstrated that increasing the global stress significantly reduces ledge capacity, while the use of prestressing increases the capacity. The research also demonstrated that concentrating the ledge reinforcement at the load location can significantly increase the ledge capacity, offering a practical design alternative for carrying heavy loads.
出版年：	2018
论文唯一标识：	J-30Y2018V63N02026
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：	50-66