CFRP-PVC管混凝土轴压中长柱承载力研究  

Study on behavior of concrete-filled CFRP-PVC tubular slender columns under axial compression

作　　者：麻胜兰 姜绍飞[1] 

机构地区：[1]福州大学,福建福州350108

出　　处：《土木工程学报》2014年第1期99-106,共8页China Civil Engineering Journal

基　　金：福建省杰出青年基金(2009J06027)

摘　　要：考虑海洋地区恶劣环境下结构易腐蚀的特点,PVC管混凝土外缠包CFRP约束结构被提出,虽然对其短柱静力性能进行了较多的研究,但尚缺少CFRP-PVC管混凝土中长柱的力学性能的报道。基于此,对4组不同长细比的构件进行试验研究,在此基础上,建立有限元数值模型,在用试验结果验证其有效性的基础上,进行了混凝土强度、CFRP层数、长细比等参数分析,最后研究给出典型的稳定系数φ和长细比λ关系曲线以及承载力简化计算公式。研究结果表明长细比、FRP条带层数及混凝土强度是影响承载力的主要因素,随着长细比的增大构件承载力降低;CFRP层数的增加提高了构件的承载力,但增加到一定层数时承载力提高不明显;随着混凝土强度的提高,构件的承载力提高不明显;提出的承载力公式理论计算值与试验结果吻合良好,表明该式对实际工程计算具有一定的参考意义。Considering the corrosion of infrastructures under the harsh ocean environment, a new composite structure called concrete, confined by FRP-PVC tubes, is proposed. Although lots of research is focused on the static behaviors of such structures, rare research on the performances of the slender columns has been reported. Therefore, the behavior of slender concrete-filled CFRP-PVC tubular columns under axial compression is studied. Four specimens with different slenderness ratio were tested and compared with numerical analysis results to validate the effectiveness of the analysis method. Factors, such as the number of CFRP layer, concrete compressive strength and the slenderness ratio, that will affect the performance are investigated by the developed method. Finally, the typical φ-λ relation curve and the bearing capacity formula are proposed for the CFRP-PVC confined concrete columns. The results show that the axial load decreases with the slenderness ratio and the bearing capacity increases when the CFRP layer or concrete compressive strength grows. However, the concrete strength increases less when the number of CFRP layers adds up to some extent. The analytical values by the proposed formula agree well with the test results, which indicate that the proposed formula can provide reference for the practical engineering analysis.

关 键 词：CFRP—PVC管 中长柱 稳定承载力 长细比 稳定系数 

分 类 号：TU375.3[建筑科学—结构工程]