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CLC number: TU317

On-line Access: 2015-04-03

Received: 2014-09-13

Revision Accepted: 2015-01-09

Crosschecked: 2015-03-23

Cited: 0

Clicked: 1937

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Li-jun Hou

http://orcid.org/0000-0002-5401-0226

Shi-lang Xu

http://orcid.org/0000-0003-4711-0883

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Journal of Zhejiang University SCIENCE A 2015 Vol.16 No.4 P.251-264

10.1631/jzus.A1400274


Experimental study of the shear properties of reinforced ultra-high toughness cementitious composite beams


Author(s):  Li-jun Hou, Zhi-yong Luan, Da Chen, Shi-lang Xu

Affiliation(s):  Key Laboratory of Coastal Disaster and Defence of Ministry of Education, Hohai University, Nanjing 210098, China; more

Corresponding email(s):   slxu@zju.edu.cn

Key Words:  Ultra-high toughness cementitious composite (UHTCC), Shear-span ratio, Stirrups, Shear strength, Diagonal crack, Shear mechanism


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Li-jun Hou, Zhi-yong Luan, Da Chen, Shi-lang Xu. Experimental study of the shear properties of reinforced ultra-high toughness cementitious composite beams[J]. Journal of Zhejiang University Science A, 2015, 16(4): 251-264.

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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.

The paper presents results of an experimental series on ultra-high toughness cementitious composites (UHTCC), which the authors explain to be what has elsewhere been defined as SHCC, or strain-hardening cement-based composites. Shear-dominant beams were designed and built, considering parameters of shear span to depth, level of shear reinforcing steel or stirrups, and reference reinforced concrete elements of similar concrete compressive strength class. Distinct differences in behaviour of R/UHTCC and R/C beams are reported, including significantly reduced shear crack widths in R/UHTCC, and no splitting cracking and debonding along flexural steel in R/UHTCC beams. Minimum stirrups are argued to be replaceable by the fibre reinforcement, based on the results indicating that no synergy in fact exists in combining fibre and stirrup reinforcement, and in the shear enhancement that the fibres add already. The tied-arch and truss analogies are proposed for modelling short and slender R/UHTCC beams respectively. I believe that these results are of interest to the readers of this journal .

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

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。

关键词:UHTCC;剪跨比;箍筋;剪切性能;抗剪机理

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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