碳纤维聚合物筋约束钢纤维混凝土柱双轴弯曲性能研究
RESEARCH ON BIAXIAL BENDING PERFORMANCE OF STEEL FIBER REINFORCED CONCRETE COLUMNS CONFINED BY CARBON FIBER POLYMER BARS
刘恺亮 1黄锐 2周芬 2杨晓3
作者信息
- 1. 郑州铁路职业技术学院,郑州 451460
- 2. 四川省公路规划勘察设计研究院有限公司,成都 610041
- 3. 太原科技大学材料科学与工程学院,太原 030024
- 折叠
摘要
为研究碳纤维增强聚合物(carbon fiber reinforced polymer,CFRP)加固对钢筋混凝土柱力学行为的影响,开展了双轴弯曲载荷下CFRP约束素混凝土柱和钢纤维混凝土细长柱压弯性能试验,探究钢纤维掺量、CFRP层数以及载荷偏心距对柱试件抗弯特性的影响.试验结果表明,与参照组(无CFRP)相比,CFRP的环箍作用显著提高了钢筋混凝土柱强度、延性以及抗变形能力.同时,还提出了一种在轴向载荷和双向弯曲作用下适合CFRP约束钢筋混凝土细长柱的数值计算方法,该方法引入了约束混凝土的双折线本构模型以及钢筋、CFRP的应力应变模型,对CFRP约束钢筋混凝土柱结构性能进行预测,计算结果与实测值均吻合较好.
Abstract
To investigate the effect of carbon fiber reinforced polymer(CFRP)reinforcement on the mechanical behavior of reinforced concrete columns,compression and bending performance tests were conducted on CFRP confined plain concrete columns and steel fiber reinforced concrete slender columns under biaxial bending loads.The effects of steel fiber content,number of CFRP layers,and load eccentricity on the bending characteristics of column specimens were investigated.The experimental results show that compared with the reference group(without CFRP),the hoop effect of CFRP significantly improves the strength,ductility,and deformation resistance of reinforced concrete columns.At the same time,a numerical calculation method suitable for CFRP constrained reinforced concrete slender columns under axial load and bidirectional bending was proposed.This method introduces a double-line constitutive model for constrained concrete and stress-strain models for steel bars and CFRP to predict the structural performance of CFRP constrained reinforced concrete columns.Both in terms of load deflection curve and ultimate bearing capacity,the calculated results are in good agreement with the measured values.
关键词
碳纤维增强聚合物/混凝土柱/双轴弯曲/环箍作用/载荷-挠度曲线Key words
carbon fiber reinforced polymer/concrete columns/biaxial bending/hooping effect/load deflection curve引用本文复制引用
基金项目
国家自然科学基金(41530639)
四川省科技厅重点研发项目(2020YFS036)
出版年
2024
NETL
NSTL
万方数据