玻璃纤维增强复材管自密实微膨胀活性粉末混凝土短柱轴压性能试验研究

祝明桥; 李智; 张紫薇

doi:10.13204/j.gyjzG20050301

玻璃纤维增强复材管自密实微膨胀活性粉末混凝土短柱轴压性能试验研究

doi: 10.13204/j.gyjzG20050301

1. 湖南科技大学土木工程学院, 湖南湘潭 411201;
2. 湖南省智慧建造装配式被动房工程技术研究中心, 湖南湘潭 411201

基金项目:

国家自然科学基金项目（51578236）；湖南省自然科学基金项目（2020JJ4313）；湖南省重点实验室开放基金项目（19K033）。

详细信息

作者简介:
祝明桥,男,1968年出生,博士,教授。电子信箱:1531290279@qq.com

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出版历程
- 收稿日期: 2020-05-03
- 网络出版日期: 2021-09-16
- 刊出日期: 2021-09-16

EXPERIMENTAL STUDY ON AXIAL COMPRESSION PERFORMANCE OF SHORT COLUMN COMPOSED OF GFRP TUBE FILLED WITH SELF-COMPACTING AND MICRO-EXPANDED RPC

1. School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China;
2. Hunan Engineering Research Center for Intelligently Prefabricate Passive House, Xiangtan 411201, China

摘要

摘要: 配制出了一种常温养护下流动度大于255 mm的高性能、高强度的自密实微膨胀活性粉末混凝土（RPC），并填充至玻璃纤维增强复材（GFRP）管。对GFRP自密实微膨胀RPC短柱进行轴压性能试验，考虑GFRP管材成型工艺、混凝土膨胀剂和构件受力方式等设计参数，重点分析试件破坏过程及形态、应力-应变曲线及构件承载力。结果表明：GFRP纤维丝±45°缠绕的GFRP管RPC短柱力学性能优越，该组合柱应力-应变曲线呈二次线性增长，组合柱破坏时，GFRP纤维丝被拉断，管内约束混凝土被压碎，其极限承载能力是无约束RPC短柱的1.6倍左右。混凝土膨胀剂改善了组合短柱的变形性，其极限应变约为无膨胀剂柱的1.4倍。Teng的理论计算模型能较好地适用全截面受压的GFRP管自密实微膨胀RPC短柱。
- 自密实微膨胀 /
- 活性粉末混凝土 /
- GFRP管 /
- 成型工艺 /
- 轴心受压
Abstract: A kind of self-compacting micro-expanded reactive powder concrete (RPC) with high performance and high strength was prepared. The RPC was cured at conventional temperature and its fluidity was greater than 255 mm. The RPC was filled into glass fiber-reinforced plastic (GFRP) tubes. The axial compression performance tests of GFRP tube filled with self-compacting micro-expaned RPC tube filled with short column were carried out. The axial compression performance tests of GFRP tube filled with self-compacting micro-expanded RPC short column were carried out. The effects of design parameters such as GFRP tube forming process, concrete expansion agent and the stress mode of members on the mechanical properties of the structure were considered in the tests. The failure mode, stress-strain curve and member bearing capacity were analyzed emphatically. The results showed that the mechanical properties of GFRP tube RPC short column with GFRP filament wound ±45° were the best, and the stress-strain curve of the composite column increased in a quadratic linear manner. When the composite column was damaged, the GFRP fibers were broken and the confined concrete in the tube was crushed. Its ultimate bearing capacity was about 1.6 times that of the unconstrained RPC short column. The concrete expansion agent improved the deformability of the combined short column, and its ultimate strain was about 1.4 times that of the column without the expansion agent. The theoretical calculation model of Teng was suitable for the GFRP tube filled with self-compacting micro-expaned RPC short column under full-section compression.
- self-compacting micro-expanded /
- reactive powder concrete /
- GFRP tube /
- forming process /
- axial compression

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