碳纤维布约束混凝土方柱的轴心受压性能

通过16个混凝土方形试件的轴压试验，研究了碳纤维布约束混凝土方柱的受压性能。试验表明，碳纤维布约束混凝土方柱截面存在有效约束区和非有效约束区，当加固率较小时，碳纤维布约束混凝土方柱的荷载-变形关系曲线有下降段。对碳纤维布约束混凝土方柱的荷载-变形关系进行了数值模拟分析，和试验结果的比较表明，分析方法正确。最后根据287个试件的数值试验结果，提出了避免出现荷载-变形关系曲线下降段的碳纤维布约束混凝土方柱界限加固率表达式。

Axial Compression Performance of Concrete Prisms Confined by Carbon Fiber Composite Sheets

Through axially compressed tests of 16 concrete prisms, mechanical behavior of concrete prisms confined by carbon fiber composite sheets is investigated. For a prism, the section may be divided into one effectively confined zone and four ineffectively confined zones. And there may be a descending branch in the load - deformation curve for a strengthened concrete prism if the strengthening ratio is small, Numerical calculation method of the load - deformation relationship for concrete prisms confined by carbon fiber composite sheets is developed, Comparing with the testing results, it is concluded that the proposed method is effective. Based on the numerical simulation results for 287 prisms using the proposed method, an expression of the balanced carbon fiber strengthening ratio to guaranty that there is no descending branch in the load -deformation curve for a strengthened concrete prism is proposed.