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为了研究纤维增强材料包裹加固砖柱的轴压性能,进行了42个(14组)玻璃纤维(GFRP)布全长包裹加固砖砌体柱和12个(4组)未加固砖柱的轴压试验,探讨了GFRP布黏贴层数、试件长宽比、未加固试件轴压强度以及倒角半径等因素对加固效果的影响。试验结果表明,由于GFRP布的约束作用,延缓了砖柱初始裂缝的出现,采用GFRP布包裹加固砖柱能明显提高轴压极限强度与峰值应变,加固后试件的极限强度与黏贴层数呈线性关系。在考虑截面有效约束区和非有效约束区的基础上,提出了玻璃纤维布包裹加固砖柱的轴压极限强度与峰值应变的计算公式,计算结果和试验结果吻合较好。
In order to study the axial compression properties of brick columns strengthened with fiber-reinforced materials, 42 (14) GFRP bundles were hardened and the axial compressive strengths of 12 columns (4 groups) The effects of factors such as the bonding number of GFRP cloth, the aspect ratio of specimen, the axial compressive strength of un-strengthened specimen and the radius of chamfering on the reinforcement effect were discussed. The results show that due to the restraint effect of GFRP cloth, the initial crack of brick column is delayed. The reinforcement of brick columns with GFRP cloth can significantly improve the ultimate strength and peak strain of the axial compressive strength, the ultimate strength and the number of adhesive layers A linear relationship. Based on the consideration of the effective restraint zone and the non-effective restraint zone, the formulas for calculating the ultimate strength and peak strain of the axial compressive strength of a brick-framed brick-wrapped reinforced concrete column are proposed. The calculated results are in good agreement with the experimental results.