内置碳纤维增强复材管的双管海水海沙混凝土柱轴压性能

Mechanical Properties of Double-Tube Seawater and Sea Sand Concrete Columns with Built-in CFRP Tubes Under Axial Compression

为了解决海水海沙混凝土在实际工程中的腐蚀问题,增强结构的抗震性能,提出了一种内置碳纤维增强复材(CFRP)管的双管海水海沙混凝土柱的新型结构,对12个内置CFRP管的双管海水海沙混凝土柱和4个普通钢管混凝土柱进行了轴向压缩试验,研究了钢管厚度和CFRP管层数对于其轴压性能的影响。试验结果表明,内部的CFRP管可以有效提高结构的承载力和延性,增强结构的抗压性能和变形能力。内置CFRP管的双管海水海沙混凝土柱的破坏往往伴随着其中1根CFRP管破坏,其余的CFRP管仍然可以提供约束,并在加载过程中依次破坏。基于面积等效和区域分割的理念,提出了内置CFRP管的双管海水海沙混凝土柱的轴压承载力计算式,并对预测精度和离散度进行了评估。

In order to solve the corrosion problems caused by seawater and sea sand concrete in the engineering practice and enhance the seismic performance of structure,a novel structure called double-tube seawater and sea sand concrete columns with built-in CFRP tubes was proposed.Axial compression test was performed on 12 double-tube seawater and sea sand concrete columns with built-in CFRP tubes and 4 concrete-filled steel tube columns.The effect of the thickness of steel tube and the layers of CFRP tube was investigated.Test results indicated that the built-in CFRP tube could improve the bearing capacity and deformation capacity of the structure.The failure of double-tube seawater and sea sand concrete columns with built-in CFRP tubes was usually accompanied by the failure of one of built-in CFRP tubes,while the rest of CFRP tubes could still provide confinement and broke in turn during loading.Based on the theory of area equivalence and area segmentation,a model for ultimate load of double-tube seawater and sea sand concrete columns with built-in CFRP tubes was proposed.Finally,the prediction accuracy and dispersion of the formula were evaluated.