Zhejiang University Press
Hangzhou
Zhejiang University Press, co-published with Springer
11582
1673-565X
1862-1775
Journal of Zhejiang University-SCIENCE A
Applied Physics & Engineering
J. Zhejiang Univ. Sci. A
Engineering
Mechanical Engineering
Civil Engineering
Classical and Continuum Physics
Industrial Chemistry/Chemical Engineering
16
16
12
4
4
7
2015
4
11
2015
4
2015
Zhejiang University and Springer-Verlag Berlin Heidelberg
2015
27
10.1631/jzus.A1400274
1
Experimental study of the shear properties of reinforced ultra-high toughness cementitious composite beams
钢筋增强超高韧性水泥基复合材料梁的剪切性能试验研究
251
264
2015
9
3
2014
9
13
2015
1
9
2015
10
1
Zhejiang University and Springer-Verlag Berlin Heidelberg
2015
Li-jun
Hou
Zhi-yong
Luan
Da
Chen
Shi-lang
Xu
slxu@zju.edu.cn
0000 0004 1760 3465
grid.257065.3
Key Laboratory of Coastal Disaster and Defence of Ministry of Education
Hohai University
Nanjing
210098
China
0000 0004 1759 700X
grid.13402.34
College of Civil Engineering and Architecture
Zhejiang University
Hangzhou
310058
China
Abstract
This paper presents an experimental investigation into the shear behavior of reinforced ultra-high toughness cementitious composite (UHTCC) beams through flexural tests under a point loading, where UHTCC shows tension strain-hardening and multiple cracking characteristics. The varied parameters include shear-span ratios of about 2.06, 3.08, and 4.11, and web reinforcement ratios of 0%, 0.25%, 0.37%, and 0.55%. The experimental results reveal that reinforced UHTCC (RUHTCC) beams have superior shear resistance compared with reinforced concrete (RC) beams and show stable crack propagation and multiple cracking behaviors in shear. The use of UHTCC as the matrix of beams can serve as a replacement for minimum web reinforcement. A small amount of stirrups used in RUHTCC slender beams results in a more ductile flexure-shear or even flexural failure. However, the use of stirrups in both short beams and RUHTCC slender beams brings little improvement in ultimate shear strength, and thus no shear synergy between UHTCC and stirrups is obtained. A tied-arch model and a truss model can be used to represent the shear mechanism of RUHTCC short and slender beams, respectively. UHTCC web subjected to tension can be considered as inclined tension web members in a truss model for RUHTCC slender beams.
摘要
目的
揭示不同剪跨比和配箍率的钢筋增强超高韧性水泥基复合材料 (RUHTCC) 梁的抗剪性能, 为超高韧性水泥基复合材料 (UHTCC) 用于结构关键抗剪部位提供参考。
方法
基于抗剪试验结果, 阐明剪跨比和配箍率对 RUHTCC 梁抗剪性能的影响, 明确 UHTCC 与箍筋之间的复合抗剪效应, 揭示 RUHTCC 梁的抗剪机理。
方法
以剪跨比和配箍率为变量参数, 通过 RUHTCC 梁在跨中集中荷载作用下的弯曲试验, 研究 RUHTCC 梁的剪切裂缝形态、 荷载-挠度行为、 破坏模式、 开裂剪切强度和极限剪切强度等抗剪性能, 并结合试验结果, 分析 RUHTCC 梁的剪力传递机理。
结论
1. RUHTCC 梁呈现出优良的剪切抗力以及稳态的斜裂缝扩展过程和多缝剪切开裂行为。 2. 配置少量的箍筋可将典型的剪切破坏转变为较为延性的弯剪破坏甚至弯曲破坏。 然而, 箍筋的配置并未显著提高 RUHTCC 梁的抗剪能力, 同时耦合 UHTCC 与箍筋也没有表现出协同抗剪效应。 3. 拉杆-拱模型和桁架-拱模型可用以描述 RUHTCC 短梁和细长梁的抗剪机理。
Key words
Ultra-high toughness cementitious composite (UHTCC)
Shear-span ratio
Stirrups
Shear strength
Diagonal crack
Shear mechanism
关键词
UHTCC
剪跨比
箍筋
剪切性能
抗剪机理
Project supported by the National Natural Science Foundation of China (No. 51408186), the Natural Science Foundation of Jiangsu Province (Nos. BK20140853 and BK20130843), and the Program of Introducing Talents of Discipline to Universities (No. B12032), China
ORCID: Li-jun HOU,
http://orcid.org/0000-0002-5401-0226
; Shi-lang XU,
http://orcid.org/0000-0003-4711-0883
ftp_PUB_17-03-24_05-06-31.zip11582-2015-Article-27.pdfPDF1.4