中文核心期刊
CSCD来源期刊
中国科技核心期刊
RCCSE中国核心学术期刊
Journal of Chongqing Jiaotong University(Natural Science)

Journal of Chongqing Jiaotong University(Natural Science) ›› 2023, Vol. 43 ›› Issue (1): 1-9.DOI: 10.3969/j.issn.1674-0696.2024.01.01

• Transportation Infrastructure Engineering •    

Effect of Flange Size on Shear Behavior of Geopolymer Concrete T-Beams

SONG Jianxiong1,2,3, MAO Yuguang1,2,3, LIU Yiwei1,2,3, SU Jie1,2,3, DU Yunxing1,2,3, SHI Caijun1,2,3   

  1. (1. Key Laboratory for GACEM & ATH, College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China; 2. International Innovation Center for G & ACEMH, College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China; 3. Key Laboratory of BS & EE of the Ministry of Education, Hunan University, Changsha 410082, Hunan, China)
  • Received:2023-03-28 Revised:2023-05-10 Published:2024-01-19

翼缘尺寸对地聚物混凝土T形梁抗剪性能的影响

宋建雄1,2,3，毛宇光1,2,3，刘翼玮1,2,3，苏捷1,2,3，杜运兴1,2,3，史才军1,2,3   

  1. (1. 湖南大学 土木工程学院 绿色先进土木工程材料及应用技术湖南省重点实验室，湖南 长沙 410082； 2.湖南大学 湖南省绿色与先进土木工程材料国际创新合作中心，湖南 长沙 410082； 3. 湖南大学 建筑安全与节能教育部重点实验室，湖南 长沙 410082)
  • 作者简介:宋建雄（1997—），男，湖南岳阳人，硕士研究生，主要从事结构力学及建筑材料方面的研究。E-mail：songjianxiong@hnu.edu.cn 通信作者：史才军（1963—），男，江苏宜兴人，教授，博士，博士生导师，主要从事水泥基材料方面的研究。E-mail：cshi@hnu.edu.cn
  • 基金资助:
    国家自然科学基金项目(52072054)

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Abstract: To investigate the effect of flange size on the shear behavior of geopolymer concrete T-beams, the shear test under concentrated loading was performed on 1 conventional reinforced concrete (RC) and 4 geopolymer concrete (GC) T-beams with different flange sizes. The relative parameters of T-beam specimens such as the load-carrying capacity, deflection, rebar strains, failure mode and crack propagation were obtained by the test. The research results indicate that the GC T-beam has similar crack propagation, failure mode and shear capacity to the RC T-beam, but its stiffness and diagonal section cracking load are lower, and the strain of longitudinal bars and stirrups in the mid span is larger. By increasing the ratio of flange thickness to effective height of the cross-section from 0.24 to 0.48, the stiffness of GC T-beam increases, the strain of the longitudinal bars in the mid span decreases, and the shear capacity increases by 12.7%. The normalized shear behavior strength of geopolymer concrete increases by 25.3%. When the flange width exceeds twice the web width, the continuous increase of the flange width can reduce the strain of the longitudinal bars in the mid span, but the stiffness, shear capacity, and the normalized shear behavior strength of geopolymer concrete will no longer increase. The calculation results of design code ACI 318-19 and Eurocode 2 significantly underestimate the shear capacity of the GC T-beams, and those of GB50010-2010 are close to the test values. To better predict the shear capacity of GC T-beam, it is recommended to increase the shear force provided by the effective shear area of the flange in the calculation formula of shear capacity.

Key words: bridge engineering; construction structure engineering; construction material engineering; geopolymer concrete; T-beams; flange size; shear behavior

摘要： 为探究翼缘尺寸对地聚物混凝土T形梁抗剪性能的影响，对1根普通混凝土和4根不同翼缘尺寸的地聚物混凝土T形梁进行了集中荷载下的抗剪试验；试验获得了T形梁试件的承载力、挠度、钢筋应变、破坏模式及裂缝的开展等相关参数。研究结果表明：地聚物混凝土T形梁具有与普通混凝土T形梁相似的裂缝扩展、破坏模式及抗剪承载力，但其刚度和斜截面开裂荷载较低，跨中纵筋和箍筋的应变较大；将翼缘厚度与截面有效高度比值从0.24增大到0.48时，地聚物混凝土T形梁的刚度增大、跨中纵筋应变减小，抗剪承载力提高了12.7%，地聚物混凝土的归一化抗剪强度增大了25.3%；当翼缘宽度超过两倍腹板宽度时，继续增大能减小跨中纵筋应变，但地聚物混凝土T形梁的刚度、抗剪承载力及地聚物混凝土归一化抗剪强度不再增大。规范ACI 318—19和Eurocode 2的计算结果明显低估了地聚物混凝土T形梁的抗剪承载力，GB 50010—2010较接近试验值。为更好预测地聚物混凝土T形梁的计算抗剪承载力，建议在抗剪承载力计算公式中增加翼缘有效受剪面积所提供的剪力。

关键词: 桥梁工程；建筑结构工程；建筑材料工程；地聚物混凝土；T形梁；翼缘尺寸；抗剪性能

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