FRP管增强混凝土结构的轴压极限强度

通过对组合结构轴心受压后期强化阶段力学特征及组分材料相互约束条件的研究,归纳出FRP管与核心混凝土的轴压极限应力预测公式;运用合成法得到FRP管混凝土的轴压极限强度;分析了各设计参数对组合结构轴压极限强度的影响。结果表明,纤维缠绕角与组合结构轴压极限强度之间呈非线性变化状态,且在不同的缠绕角范围内,轴压极限强度的变化趋势不同,组合结构达到强度极值点的纤维最佳缠绕角为72°。而约束管含量比与轴压极限强度之间近似呈正比关系。

Axial Ultimate Compressive Strength of FRP-tube Reinforced Concrete Structure

By studying the mechanics characteristics of the axial compression of the combined structure in the late reinforcement service stage and the restricted condition of the composition materials,the predicted expression of the axial compressive ultimate stress of FRP-tube reinforced concrete is concluded.The axial compressive ultimate strength of the FRP reinforced concrete is obtained by synthesis method.The effect of the design parameters on the axial ultimate compressive strength of the combined structure is analyzed.The result shows that there's a nonlinear relationship between the fiber winding angle and the axial ultimate compressive strength and the best winding angle was 72 degrees at the maximum strength point of the combined structure.The axial ultimate compressive strength almost increases gradually with the increase of the content proportion of FRP tube.