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原文传递 Shear Strength of Beams Made Using Hybrid Fiber-Engineered Cementitious Composites

题名：	Shear Strength of Beams Made Using Hybrid Fiber-Engineered Cementitious Composites
其他题名：	ACI(American Concrete Institute).(1996)."State of the art report of fiber reinforced concrete."ACI 544.1R-96,Farmington Hills,MI(Re-approved in 2009).
正文语种：	英文
作者：	Yazan Alrefaei
关键词：	Beam;Composites;Hybrid fibers;Multiple cracking;Shear;Strength;Strain hardening;Metal and composite structures
摘要：	This paper reports the results of an experimental investigation of the shear behavior of beams made using hybrid fiber-engineered cementitious composites (HFECC). The paper specifically deals with the shear behavior of beams made using strain hardening engineered cementitious composites that incorporate relatively low volume ratios (Vf ≤ 2％) of discontinuous, randomly distributed hybrid fibers (steel and polyethylene) and how the strain hardening characteristics of the fiber composite impact the shear behavior of the beam. A total of 21 beams reinforced with longitudinal steel bars and with various combinations of polyethylene (PE) and steel (ST) fibers were tested in a threepoint loading setup at a shear span to depth ratio of 3. The total volume fraction of the fibers in the composites ranged from 0 to 2％, and the matrix was either cementitious paste or cementitious mortar. The beams were tested in controlled deformations to enable capturing the postpeak behavior. It is shown that HFECC made using cementitious paste was effective in increasing the shear strength by up to 8 times relative to the nonfibrous matrix. In addition, the ductility, multiple cracking behavior, and shear strain capacity of the beams were considerably improved. Improvements were also observed in the HFECC beams made with cementitious mortar but to a lesser extent, in which the shear strength increased up to 3 times relative to the nonfibrous matrix. The results also showed that when used in HFECC, the PE fibers were nearly as effective as steel fibers in increasing the shear strength. The addition of fibers allowed the beams to reach or exceed their calculated flexural capacity in spite of the relatively large longitudinal reinforcement ratio used. A fiber volume of 1％ is shown to be an adequate minimum shear reinforcement for beams with compressive strengths ranging from 40 to 65 MPa, irrespective of the hybridization ratio and the binding matrix.
出版年：	2018
论文唯一标识：	P-26Y2018V144N01006
英文栏目名称：	ANNIVERSARY PAPERS
doi：	10.1061/(ASCE)ST.1943-541X.0001924
期刊名称：	Journal of Structural Engineering
拼音刊名(出版物代码)：	P-26
卷：	144
期：	01
页码：	49-58