BFRP网格增强ECC复合加固混凝土圆柱轴压性能研究
Compressive behavior of concrete columns strengthened with BFRP textile reinforced ECC
李大强 1黄晓斌 1万旭荣 1彭晓 1陈轩2
作者信息
- 1. 南昌市城市规划设计研究总院集团有限公司,江西 南昌 330038
- 2. 西安建筑科技大学 土木工程学院,陕西 西安 710055
- 折叠
摘要
为研究玄武岩纤维网格增强工程水泥基复合材料(BFRP-ECC)加固混凝土圆柱的轴压力学性能,对BFRP(basalt fiber reinforced polymer)网格增强 ECC(engineered cementitious composites)和BFRP网格增强水泥砂浆(BFRP-mortar)复合加固混凝土柱进行了轴压对比试验,分析了BFRP-ECC加固混凝土柱的破坏模式、承载力和变形能力等.采用ABAQUS有限元软件建立BFRP网格-基质复合加固混凝土柱数值模型,并通过对比模拟结果与试验结果验证了有限元建模的准确性;同时,考虑了核心混凝土柱初始损伤的影响,建立了复合材料加固损伤混凝土柱有限元分析模型,研究了BFRP-ECC加固损伤混凝土圆柱各部件的受力特点和破坏模式等.结果表明:采用BFRP网格增强水泥基质加固混凝土柱可以显著提高其承载力和变形能力,其中:ECC作为基质时效果更优;BFRP-ECC加固混凝土柱破坏具有延性特征,核心区塑性变形分布均匀;核心柱初始损伤对BFRP-ECC复合加固混凝土柱破坏模式的影响较小,且ECC以及BFRP网格仍表现出良好的协调变形能力.
Abstract
To study the axial compression performance of BFRP(basalt fiber reinforced polymer)reinforced ECC(engineered cementitious composites)composite reinforced concrete columns,BFRP-ECC and BFRP-mortar reinforced concrete columns were tested under axial compression,and the damage mode,bearing capacity and deformation ability of BFRP-grid reinforced ECC reinforced concrete column were analyzed.The finite element software ABAQUS was used to established finite element models of BFRP-matrix reinforced columns,and the accuracy of finite element modeling was verified by comparing simulation results with experimental results.Meanwhile,finite element models of BFRP-ECC reinforced damaged columns were established,considering the effect of initial damage on core concrete columns,and the stress characteristics and failure modes of various components of BFRP-ECC reinforced damaged concrete columns were obtained.The results showed that the bearing capacity and deformation capacity of concrete columns strengthened with cement matrix reinforced with BFRP grid can be significantly improved,and the effect was better when the ECC was used as matrix.The failure of BFRP-ECC reinforced concrete column possessed ductility characteristics and uniform plastic deformation distribution of the core area.The initial damage of the core column has little effect on the failure mode of BFRP-ECC composite reinforced concrete columns,and the ECC and BFRP grid still show good deformation coordination ability.
关键词
BFRP网格/ECC/破坏模式/受压性能/初始损伤Key words
BFRP grid/ECC/failure mode/compressive behavior/initial damage引用本文复制引用
基金项目
中国博士后科学基金面上项目(2021M693876)
国家自然科学基金项目(51278395)
出版年
2024
NETL
NSTL
万方数据