自密实微膨胀混凝土填充圆钢管约束钢筋混凝土柱轴压性能试验研究

姜海波; 李佳航; 李军生; 陈振侃; 叶嘉政

doi:10.13204/j.gyjzG21032003

自密实微膨胀混凝土填充圆钢管约束钢筋混凝土柱轴压性能试验研究

doi: 10.13204/j.gyjzG21032003

1. 广东工业大学土木与交通工程学院, 广州 510006;
2. 广州广明高速公路有限公司, 广州 511430;
3. 广州交通投资集团有限公司营运分公司, 广州 511430

基金项目:

国家自然科学基金项目(51778150)

广州市科技规划项目(201804010422)

2020年度广东省科技创新战略专项资金项目(pdjh2020b0179)。

详细信息

作者简介:
姜海波,男,1970年出生,博士,教授。电子信箱:hbjiang@gdut.edu.cn

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出版历程
- 收稿日期: 2021-03-20
- 网络出版日期: 2023-05-25
- 刊出日期: 2023-02-20

Experimental Research on Mechanical Properties of RC Columns Confined with Self-Compacting and Micro-Expanding Concrete Filled Circular Steel Tube Under Axial Compression

1. School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China;
2. Guangzhou Guangming Expressway Co., Ltd., Guangzhou 511430, China;
3. Guangzhou Communications Investment Group Co., Ltd., Operating Branch, Guangzhou 511430, China

摘要

摘要: 为了探究自密实微膨胀混凝土填充圆钢管(SMCFCST)约束钢筋混凝土(RC)柱的轴压性能,设计并制作了8根约束柱和1根无约束RC柱,并对其进行轴压试验。试验参数包括钢管厚度、自密实微膨胀填充混凝土强度、填充混凝土类型和初始轴压力。记录试件破坏模式和加载数据,并绘制相应的荷载-竖向变形曲线和荷载-应变曲线。结果表明:RC柱被SMCFCST约束后,其峰值荷载和延性均显著提高;随着钢管厚度增大,约束柱的峰值荷载显著增大;随着自密实微膨胀填充混凝土强度增大,约束柱的峰值荷载小幅增大;而填充混凝土类型和初始轴压力对约束柱峰值荷载的影响不明显。修改GB 50936-2014《钢管混凝土结构技术规范》公式,得到SMCFCST约束柱的轴压承载力预测公式。预测值与试验值比值的平均值为0.956,标准差为0.064。
- 自密实微膨胀混凝土 /
- 圆钢管 /
- 约束 /
- RC柱 /
- 轴压试验
Abstract: To investigate the mechanical properties of RC columns confined with self-compacting and micro-expanding concrete filled circular steel tube (SMCFCST) under axial compression, 8 confined RC columns and 1 unconfined RC column were designed and fabricated, and an axial compressive test was conducted. The test parameters including the thickness of the steel tube, the strength of self-compacting and micro-expanding filling concrete, the type of the filling concrete and the magnitude of the initial axial pressure were considered. The failure modes of specimens and the loading data were recorded, while the load versus vertical deformation curves and the load-strain curves were depicted accordingly. The results showed that the peak loads and ductility of the RC columns were significantly improved after being confined by SMCFCST. The peak loads of the confined columns were apparently increased with the increase of the thickness of steel tube. The peak loads of the confined columns were slightly increased with the increase of the strength of self-compacting and micro-expanding filling concrete. However, the effects of the type of filling concrete and the magnitude of the initial axial pressure on the peak loads of the confined columns were negligible. The formula from Technical Code for Concrete Filled Steel Tubular Structures (GB 50936-2014) was modified to obtain the predictive formula of the bearing capacity of the SMCFCST confined columns under axial compression. The average value of the ratio of the predicted value to the test value was 0.956, and the standard deviation was 0.064.
- self-compacting and micro-expanding concrete /
- circular steel tube /
- confinement /
- RC column /
- axial compression test

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