倒角半径与加载速率对FRP弱约束方形混凝土柱的承载能力影响

doi:10.19936/j.cnki.2096-8000.20210728.010

复合材料科学与工程 ›› 2021, Vol. 0 ›› Issue (7): 63-67.DOI: 10.19936/j.cnki.2096-8000.20210728.010

倒角半径与加载速率对FRP弱约束方形混凝土柱的承载能力影响

马晨雨¹, 姬宇鹏¹, 刘大为¹, 刘昊源¹, 曹玉贵^2*

1.武汉理工大学土木工程与建筑学院,武汉430070;
2.武汉理工大学道路桥梁与结构工程湖北省重点实验室,武汉430070

收稿日期:2021-02-17 出版日期:2021-07-28 发布日期:2021-08-04
通讯作者: 曹玉贵(1984-),男,博士,副研究员,主要从事FRP混凝土复合结构方面的研究,caoyugui@163.com。
作者简介:马晨雨(2000-),男,学士,主要从事FRP约束混凝土的抗压强度方面的研究。
基金资助:
国家自然科学基金(51808419);武汉理工大学自主创新研究基金项目(2020-TJ-B1-03)

The effect of corner radius and strain rate on the compressive strength of FRP weakly confined square concrete

MA Chen-yu¹, JI Yu-peng¹, LIU Da-wei¹, LIU Hao-yuan¹, CAO Yu-gui^2*

1. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China;
2. Hubei Key Laboratory of Roadway Bridge and Structure Engineering, Wuhan University of Technology, Wuhan 430070, China

Received:2021-02-17 Online:2021-07-28 Published:2021-08-04

摘要/Abstract

摘要： 为研究倒角半径和应变速率对纤维增强复合材料(FRP)弱约束混凝土方柱抗压强度的影响规律,对20个FRP弱约束混凝土方柱进行了不同加载速率的轴压试验,探讨混凝土柱倒角半径和应变速率对FRP约束混凝土力学性能的影响,并绘制了相应的应力-应变关系曲线。结果表明:随着试件倒角半径的增加,FRP弱约束混凝土的抗压强度呈现增大的趋势;随着应变速率的增大,FRP弱约束混凝土的抗压强度也呈现增大的趋势;并采用试验结果对现有的抗压强度模型进行评估,发现不同加载速率下FRP强约束混凝土圆柱的抗压强度模型可以用于预测不同加载速率下FRP弱约束混凝土方柱的抗压强度。

关键词: 倒角半径, 应变速率, FRP弱约束混凝土, 抗压强度, 模型评估, 复合材料

Abstract: Fiber-reinforced polymer (FRP) has been widely used in repair or confinement concrete column. However, most of research has been conducted on the mechanical behavior of FRP strong confined circular concrete. Few studies had focused on the mechanical behavior of FRP weakly confined square cylinder. In order to study the influence of the corner radius ratio and strain rate on the compression mechanical properties of FRP weakly confined square cylinder, an experiment of 20 specimens with different corner radius was carried out under different strain rates. The typical stress-strain curves were drawn based on the test data. The test results show that the compressive strength of FRP weakly confined square cylinder increased with the increase of both corner radius ratio and strain rate. The test results are used to evaluate the existing compressive strength model, and it was found that the existing compressive strength model can be used to predict the compressive strength of FRP weakly confined square concrete under different loading rates.

Key words: corner radius, strain rate, FRP weakly confined concrete, compressive strength, model evaluation, composites

中图分类号:

TB332

马晨雨, 姬宇鹏, 刘大为, 刘昊源, 曹玉贵. 倒角半径与加载速率对FRP弱约束方形混凝土柱的承载能力影响[J]. 复合材料科学与工程, 2021, 0(7): 63-67.

MA Chen-yu, JI Yu-peng, LIU Da-wei, LIU Hao-yuan, CAO Yu-gui. The effect of corner radius and strain rate on the compressive strength of FRP weakly confined square concrete[J]. COMPOSITES SCIENCE AND ENGINEERING, 2021, 0(7): 63-67.

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倒角半径与加载速率对FRP弱约束方形混凝土柱的承载能力影响

The effect of corner radius and strain rate on the compressive strength of FRP weakly confined square concrete

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