梁纵筋黏结状况对矿渣地聚物混凝土梁柱中节点抗震性能的影响

doi:10.3969/j.issn.1674-0696.2022.11.12

重庆交通大学学报（自然科学版） ›› 2022, Vol. 41 ›› Issue (11): 89-98.DOI: 10.3969/j.issn.1674-0696.2022.11.12

梁纵筋黏结状况对矿渣地聚物混凝土梁柱中节点抗震性能的影响

毛宇光1,2,3，刘钰中1,2,3，杜运兴1,2,3，苏捷1,2,3，胡翔1,2,3，史才军1,2,3

(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)

收稿日期:2022-04-15 修回日期:2022-10-21 发布日期:2023-01-04
作者简介:毛宇光(1996—)，男，江西赣州人，博士研究生，主要从事结构抗震、新型建筑材料性能的研究。E-mail: ygmao@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，主要从事水泥和混凝土、新型建筑材料性能的研究。E-mail: cshi@hnu.edu.cn
基金资助:
国家自然科学基金项目(51638008)

Effect of Bond Condition of Beam Longitudinal Bars on Seismic Performance of Slag Geopolymer Concrete Beam-Column Joints

MAO Yuguang1,2,3, LIU Yuzhong1,2,3, DU Yunxing1,2,3, SU Jie1,2,3, HU Xiang1,2,3, SHI Caijun1,2,3

(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:2022-04-15 Revised:2022-10-21 Published:2023-01-04

摘要/Abstract

摘要： 为了研究梁纵筋黏结状况对矿渣地聚物混凝土梁柱中节点抗震性能的影响，制备了1个普通混凝土梁柱中节点试件及3个不同黏结状况的矿渣地聚物混凝土梁柱中节点试件，开展了低周反复加载试验；分析了节点试件裂缝发展趋势、破坏模式、滞回曲线以及梁纵筋应变值的变化；讨论了节点试件的延性、强度、刚度、耗能能力及节点核心区剪切变形等抗震性能。结果表明：在低周反复荷载作用下，较低的梁纵筋黏结强度和较大的节点梁纵筋滑移量使得矿渣地聚物混凝土中节点抗震性能比普通混凝土中节点差；增大轴压比或增大节点梁纵筋贯穿段长度能改善矿渣地聚物混凝土中节点梁纵筋的黏结状况，从而改善其抗震性能；针对GB 50010—2010《混凝土结构设计规范》关于矿渣地聚物混凝土中节点黏结状况限制条件的空白提出了建议值。

关键词: 桥梁工程；建筑结构工程；建筑材料工程；矿渣地聚物混凝土；梁柱节点；中节点；抗震性能

Abstract: To investigate the effect of beam longitudinal bars bond condition on the seismic performance of slag geopolymer concrete (GC) beam-column joints, one common concrete beam-column joint specimen and three geopolymer concrete beam-column joint specimens with different bonding conditions were prepared, and low cycle repeated loading tests were carried out. The crack development trend, failure mode, hysteretic curve, and strain values of beam longitudinal bars of joint specimens were analyzed. Seismic performance, including ductility, strength and stiffness degradation, energy dissipation capacity, and shear deformation of joint specimens, was discussed. The results show that: under the action of low cycle repeated load, the low bond strength of beam longitudinal bars and the large slip of beam longitudinal bars make the seismic performance of joints in geopolymer concrete worse than that in ordinary concrete. Increasing the axial compression ratio or increasing the length of the beam longitudinal reinforcement penetration can improve the bonding condition of the joint beam longitudinal reinforcement in the GC joints, which further improves its seismic performance. According to the blank of the limiting conditions of joint bond conditions of geopolymer concrete in GB 50010-2010 Code for Design of Concrete Structures, the recommended values are proposed.

Key words: bridge engineering; construction structure engineering; construction material engineering; slag geopolymer concrete; beam-column joints; interior joints; seismic performance

中图分类号:

毛宇光1,2,3，刘钰中1,2,3，杜运兴1,2,3，苏捷1,2,3，胡翔1,2,3，史才军1,2,3. 梁纵筋黏结状况对矿渣地聚物混凝土梁柱中节点抗震性能的影响[J]. 重庆交通大学学报（自然科学版）, 2022, 41(11): 89-98.

MAO Yuguang1,2,3, LIU Yuzhong1,2,3, DU Yunxing1,2,3, SU Jie1,2,3, HU Xiang1,2,3, SHI Caijun1,2,3. Effect of Bond Condition of Beam Longitudinal Bars on Seismic Performance of Slag Geopolymer Concrete Beam-Column Joints[J]. Journal of Chongqing Jiaotong University(Natural Science), 2022, 41(11): 89-98.

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梁纵筋黏结状况对矿渣地聚物混凝土梁柱中节点抗震性能的影响

Effect of Bond Condition of Beam Longitudinal Bars on Seismic Performance of Slag Geopolymer Concrete Beam-Column Joints

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