GFRP管增强混凝土结构的轴压强度临界值

为完善和发展FRP管增强混凝土结构的设计与计算理论，在确定组合结构轴心受压时所经历的3个典型工作阶段后，运用经典层合板理论和组分材料相互约束条件，归纳出弹塑性阶段终点时约束管和核心混凝土的轴向应力预测方程．在壳体与核心柱体界面无黏接力的情况下，用合成法得到GFRP管增强混凝土柱轴心受压状态下的强度临界值，从而可以预测任意组合下该种结构的工作强度．分析了各性能参数对GFRP管混凝土结构轴心受压强度设计指标的影响，结果表明，纤维缠绕角与组合结构的强度临界值之间呈非线性变化状态，且在不同的缠绕角范围内，强度临界值呈现出不同的变化趋势．而含量比与强度临界值之间存在近似线性关系，且成正比．

Citical strength of GFRP tube reinforced concrete under axial compression

To develop the design and computational theory for FRP reinforced concrete structure and provide theoretical basis for its application, considering three typical service stages, axial stress expressions of GFRP tubes and concrete core were derived based on classical laminate theory and equilibrium of forces. Upon the assumption that there's no sticking force between GFRP shell and concrete core, proposed analytical measures and formulae to calculate critical strength of GFRP reinforced concrete columns under axial compression. Thus the practical service strength of the combined structure can be forecasted in advance. And in terms of the summary of experimental and analytical results, the analysis on effect of design parameters on strength of GFRP-concrete structure under axial compression was furthered. Results show that there's a nonlinear relationship between the fiber winding-angle and the critical strength of the combined structure, and the latter displays different tendency with the different winding angle. There's almost linear relationship between the content ratio and the critical strength. The latter increases gradually with the increase of the former.