FRP-钢复合管约束高强混凝土轴压短柱试验研究  

Experimental Research on FRP-steel Composite Tube Confined High-strength Concrete Short Column Under Axial Compression

作　　者：张剑瑞 何泽朝 马恺泽[2] ZHANG Jian-rui;HE Ze-zhao;MA Kai-ze(The Engineering Design Academy of Chang an University Co.,Ltd.,Xi'an,Xi'an 710061,Shaanxi,China;College of Civil Engineering,Chang an University,Xi'an 710061,Shaanxi,China)

机构地区：[1]西安长安大学工程设计研究院有限公司,陕西西安710061 [2]长安大学建筑与土木工程学院,陕西西安710061

出　　处：《建筑科学与工程学报》2022年第6期113-121,共9页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(51578077);陕西省自然科学基础研究计划项目(2017JM5037)。

摘　　要：为研究纤维增强复合材料(FRP)-钢复合管约束高强混凝土短柱的轴压性能,以混凝土强度、钢管厚度、FRP层数和种类为参数开展了轴压试验研究,分析了试件的约束机制、破坏机理、轴向荷载-应变曲线和环向荷载-应变曲线。结果表明:所有试件表现出相似的破坏特征,即FRP发生断裂、钢管鼓曲变形明显,增加钢管厚度和混凝土强度均可有效提高短柱的极限承载力,但增加混凝土强度会降低短柱的变形能力,加快其承载力下降速率;增加FRP层数可以明显提高短柱的承载能力和塑性变形能力,并延缓承载力下降速率,但对短柱弹性段和下降段的刚度以及强化平台段影响较小;碳纤维增强复合材料(CFRP)对短柱极限承载力的提高要优于玻璃纤维增强复合材料(GFRP),但CFRP约束的短柱承载力下降速率更快;与CFRP相比,GFRP对短柱刚度退化的延缓作用要更明显;FRP断裂时,测点位置CFRP、GFRP的应变仅为极限应变的0.54倍、0.56倍;提出的短柱轴压承载力和峰值应变计算方法的计算结果与试验结果吻合良好。An experimental study on high-strength concrete short columns confined by FRP-steel composite tube was carried out to study the axial compression performance,and the variables included the strength of concrete,the thickness of steel tube,the layer and type of FRP.The restraint mechanism,failure mechanism,axial and circumferential load-vertical strain curves of the specimens were investigated.The results show that all specimens show similar failure modes,FRP is broken and the steel is buckled and deformed obviously.The increases in the thickness of steel tube and strength of concrete can effectively improve the ultimate bearing capacity of the short columns,but the increase of concrete strength weakens the deformation capacity and increases the degradation rate of the bearing capacity.The increase in the layer number of FRP improves the bearing and plastic deformation capacities of the short columns,and decreases the degradation rate of the bearing capacity,but it has little effect on the stiffness in the elastic and decline stages and the strengthening platform stage.The improvement of CFRP on the bearing capacity is more obvious than that of GFRP,but the short columns confined by CFPR shows a faster degradation rate in the bearing capacity.Compared with CFRP,GFRP delays the stiffness degradation of short columns more obviously.When FRP breaks,the strains of CFRP and GFRP at the measured point are only 0.54 times and 0.56 times of the limit strain.The calculated results of the proposed calculation methods of axial bearing capacity and peak strain of short columns are in good agreement with the experimental results.

关 键 词：FRP-钢复合管 轴心受压 极限承载力 变形能力 峰值应变 

分 类 号：TU398.9[建筑科学—结构工程]