IHFRP约束混凝土圆柱轴压性能

为了研究层内混杂纤维布(IHFRP)对混凝土圆柱体的加固效果,通过24个混凝土圆柱体的轴心抗压性能试验,分析了各种IHFRP约束混凝土柱的破坏形式、承载力、变形性能和应力-应变全曲线.试验结果表明:IHFRP可显著改善柱的承载力及变形性能; 对于相同层数纤维布约束试件,随着IHFRP中碳纤维含量的增加,承载力增长显著; 相对于单一碳纤维布(CFRP)约束试件的峰值竖向应变,3种IHFRP约束试件峰值竖向应变提高了60%~100%; 将IHFRP应力-应变模型与试验曲线进行对比,拟合效果良好.试验结果为桥梁墩柱和框架柱等构件的加固设计提供了参考.

Axial compression performance of IHFRP confined concrete column

In order to study the reinforcement effect of intraply hybrid fiber reinforced polymer(IHFRP)on concrete columns, the failure mode, bearing capacity, deformation performances and stress-strain curves of various IHFRP confined concrete columns were analyzed through the tests for axial compression performances of 24 concrete columns. The results show that IHFRP can significantly improve the bearing capacity and deformation performances of the columns. For the specimens confined with the same layers of fiber reinforced polymer, the bearing capacity obviously increases with increasing the content of carbon fiber in IHFRP. Compared with the peak longitudinal strain of the specimens confined with single carbon fiber reinforced polymer(CFRP), the peak longitudinal strain of the specimens confined with three kinds of IHFRP gets enhanced by 60% to 100%. Through comparing the IHFRP stress-strain model with the experimental curves, it is noted that the good fitting effect can be obtained. The experimental results can provide the references for the enhancement design of such components as bridge pier columns and frame columns.