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（英文）  

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

作　　者：Li-jun HOU Zhi-yong LUAN Da CHEN Shi-lang XU 

机构地区：[1]Key Laboratory of Coastal Disaster and Defence of Ministry of Education, Hohai University [2]College of Civil Engineering and Architecture, Zhejiang University

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2015年第4期251-264,共14页浙江大学学报（英文版）A辑（应用物理与工程）

基　　金：Project supported by the National Natural Science Foundation of China(No.51408186);the Natural Science Foundation of Jiangsu Province(Nos.BK20140853 and BK20130843);the Program of Introducing Talents of Discipline to Universities(No.B12032),China

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。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 strainhardening 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.

关 键 词：UHTCC 剪跨比 箍筋 剪切性能 抗剪机理 

分 类 号：TU375[建筑科学—结构工程]