GFRP-钢混合配筋混凝土结构使用寿命预测方法研究
Research on the service life prediction method of concrete structure with hybrid reinforcement of GFRP bars and steel bars

为了研究GFRP-钢混合配筋混凝土结构的使用寿命，由素混凝土以及混凝土环境下钢筋、GFRP筋三者使用寿命预测方法特点出发，探讨混合配筋结构中混凝土耐久性能、GFRP筋与钢筋面积比影响下结构使用寿命预测方法，提出混合配筋混凝土结构使用寿命预测优化模型。利用提出的预测模型对GFRP筋-钢混合配筋T梁结构使用寿命进行分析。研究结果表明：混合配筋混凝土结构的使用寿命由混凝土、钢筋以及GFRP筋3种材料共同决定，且随着混凝土的耐久性能及配筋面积比的差异，整体结构使用寿命也有所不同。混凝土的耐久性能较差时，整体使用寿命由混凝土决定；混凝土耐久性能较好时，整体使用寿命由GFRP筋与钢筋面积比以及混凝土环境中钢筋与GFRP筋使用寿命共同决定；该预测模型可用于混合配筋混凝土结构剩余使用寿命评估及其维修加固决策。
In order to study the service life prediction method of concrete structure with hybrid reinforcement of GFRP bars and steel bars, based on the service life prediction feature of plain concrete and reinforced bars, GFRP bars in concrete environment, the structure service life prediction method under the influence of concrete durability and GFRP and steel bars area ratio was discussed and the service life prediction model of hybrid reinforced concrete structure was proposed. The proposed prediction model was used to analyze the service life of the hybrid reinforced T beams. Results show: the service life of the hybrid reinforced concrete structure is determined by three kinds of materials of the concrete, steel bar and GFRP bar, and with the difference of the concrete durability and reinforcement ratio, the service life of the overall structure is also different. When the concrete durability is poor, the structure service life is decided by the concrete durability; When the durability of concrete is better, the structure service life is determined by the different area ratios and the service life of the steel bars and GFRP bars in the concrete environment; The prediction model can be used to evaluate the residual service life of the hybrid reinforced concrete structures and the decision making of maintenance and reinforcement