Ultimate shear resistance of ultra-high performance fiber reinforced concrete-normal strength concrete beam

Ji He; Liu Chao

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Ultimate shear resistance of ultra-high performance fiber reinforced concrete-normal strength concrete beam

机译：超高性能纤维混凝土-标准强度混凝土梁的极限抗剪强度

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The composite element of ultra-high performance fiber reinforced concrete (UHPFRC) and normal strength concrete (NC) is an effective way to take full advantage of the material properties of UHPFRC and NC. In this paper, the calculation method for UHPFRC-NC composite beams with stirrups based on ultimate equilibrium theory is proposed. The shear resistance of composite beams is divided into three parts: compression zone, stirrups and UHPFRC layer. The shear contribution of stirrups and compression zone is calculated according to the force equilibrium state of the free body of the composite beam. The shear contribution of the UHPFRC layer is calculated based on the fracture pattern of the single hinge in the UHPFRC layer. Then the calculation method is modified considering the size effect. Subsequently, the shear experiment of the UHPFRC-NC composite beams is conducted to test the validity of the calculation method and study the influence of the UHPFRC layer, longitudinal reinforcement and size effect on the composite beams. Meanwhile, the universality of the method is verified based on the cantilever shear experiments of other researchers.

机译：超高性能纤维增强混凝土（UHPFRC）和中强度混凝土（NC）的复合元素是充分利用UHPFRC和NC的材料性能的有效途径。提出了基于极限平衡理论的带箍筋UHPFRC-NC复合梁的计算方法。复合梁的抗剪强度分为三个部分：压缩区，箍筋和UHPFRC层。根据组合梁自由体的力平衡状态，计算箍筋和压缩区的剪切贡献。根据UHPFRC层中单个铰链的断裂模式，计算UHPFRC层的剪切贡献。然后考虑尺寸效应修改计算方法。随后，进行了UHPFRC-NC组合梁的剪力试验，以验证计算方法的有效性，并研究了UHPFRC层，纵向钢筋和尺寸效应对组合梁的影响。同时，基于其他研究人员的悬臂剪切实验，验证了该方法的通用性。

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来源
《Engineering Structures》 |2020年第15期|109825.1-109825.16|共16页
作者
Ji He; Liu Chao;
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作者单位

Tongji Univ Civil Engn Sch Dept Bridge Engn Siping Rd 1239 Shanghai Peoples R China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
Ultra-high performance fiber reinforced concrete-normal strength concrete beam; Ultimate shear resistance; Ultimate equilibrium theory; Experiment; Size effect;

机译：超高性能纤维增强混凝土-普通强度混凝土梁;极限剪切强度;极限平衡理论;实验;尺寸效果;

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专利

1. Numerical analysis on shear resistance of ultra-high performance concrete-normal strength concrete composite beam [J] . He Ji, Chao Liu Structural concrete . 2021,第2期

机译：超高性能混凝土正常强度混凝土复合梁剪切电阻的数值分析
2. Structural behavior of ultra-high performance fiber reinforced concrete-normal strength concrete or high strength concrete composite members [J] . Hussein Luaay, Amleh Lamya Construction and Building Materials . 2015,第sepa15期

机译：超高性能纤维增强混凝土-普通强度混凝土或高强度混凝土复合构件的结构性能
3. Shear strengthening of reinforced concrete beams using prefabricated ultra-high performance fiber reinforced concrete plates: Experimental and numerical investigation [J] . Sakr Mohammed A., Sleemah Ayman A., Khalifa Tarek M., Structural concrete . 2019,第3期

机译：预制超高性能纤维混凝土板对钢筋混凝土梁的抗剪加固：试验和数值研究
4. EFFECT OF SMALL CIRCULAR OPENING ON THE SHEAR AND FLEXTURAL BEHAVIOR AND ULTIMATE STRENGTH OF REINFORCED CONCRETE BEAMS USING NORMAL AND HIGH STRENGTH CONCRETE [C] . World conference on earthquake engineering . 2004

机译：小圆形开口对钢筋混凝土梁的剪切和弯曲行为及终极强度的影响
5. Investigation of Strength-Enhancement Mechanism and Size Effect on Ultimate Shear Strength of Steel Fiber-Reinforced Concrete (SFRC) Slender Beams [D] . Zarrinpour, Mohammad Reza. 2016

机译：钢纤维钢筋混凝土（SFRC）纤维梁极限剪切强度的强度增强机理和大小效应研究
6. Experimental Study on Shear Behavior of Steel Fiber Reinforced Concrete Beams with High-Strength Reinforcement [O] . Jun Zhao, Jingchao Liang, Liusheng Chu, 2018

机译：高强度钢筋钢纤维混凝土梁抗剪性能的试验研究
7. Mechanical properties of various concrete after high temperature exposure Mechanical property of various types of concrete after high temperature exposure is investigated. Considering compressive strength requirement for a vertical element in high rise building, concrete specimens with various design strengths of 35, 80, 100, and 150 MPa were tested. Particularly, the influence of incorporated steel fiber on fire resistance is of interest in this study. Experimental results show that the fire resistance depends on the design strength and steel fiber content. Normal strength concrete (NSC) of a design strength of 35 MPa or high performance concrete (HPC) of 80-100 MPa does not spall when exposed to 100-400 °C of temperature. However, an explosive spalling occurs at 300 °C when the HPCs contain 1 vol. of steel fiber. Ultra-high performance concrete (UHPC) of a design strength of 150 MPa and 1.5 vol. of steel fiber also shows dramatic spalling at 300 °C. The experimental results found in this study can contribute to a better understanding of the behaviors of HPC and UHPC under fire and the role of steel fiber on the fire resistance. [O] . 2017

机译：研究了高温暴露后各种混凝土高温曝光机械性能各种混凝土的机械性能。考虑到高层建筑中垂直元件的抗压强度要求，测试了35,80,100和150MPa各种设计强度的混凝土试样。特别是，在这项研究中，掺入钢纤维对耐火性的影响。实验结果表明，耐火性取决于设计强度和钢纤维含量。在暴露于100-400°C的温度时，80-100MPa的设计强度为35MPa或高性能混凝土（HPC）的正常强度混凝土（NSC）不会击落。然而，当HPC含有1体积的钢纤维的百分比时，爆炸性剥落发生在300℃。超高性能混凝土（UHPC）的设计强度为150 MPa和1.5 Vol。钢纤维的百分比也显示出300℃的剧烈剥落。本研究中发现的实验结果可以有助于更好地了解在火灾中的HPC和UHPC的行为以及钢纤维对耐火性的作用。
8. Ultra-High Performance Fiber-Reinforced Concrete (UHPFRC) for Infrastructure Rehabilitation Volume 2: Behavior of Ultra-High Strength Concrete Bridge Deck Panels Compared to Conventional Stay-In-Place Deck Panels. [R] . Myers, J. J., Gora Venancio, V. 2017

机译：用于基础设施修复的超高性能纤维增强混凝土（UHpFRC）第2卷：超高强度混凝土桥面板与传统的现场甲板面板相比的行为。

Ultimate shear resistance of ultra-high performance fiber reinforced concrete-normal strength concrete beam

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