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为了研究GFRP筋—钢筋混合配筋混凝土板的耐久性及抗弯性能,以混凝土碳化深度到达钢筋表面为标志,结合钢筋表面去钝化时间最小均值计算公式,对比分析6组不同配筋布置的GFRP筋—钢筋混合配筋混凝土板的耐久性。推导GFRP筋—钢筋混合配筋混凝土板适筋破坏的正截面受弯承载力计算公式,利用推导的受弯承载力计算公式对7组具有相同整体配筋率、不同GFRP筋与钢筋面积比的混合配筋板的抗弯承载力进行计算。研究结果表明:GFRP筋与钢筋合理混合布置,可较大程度地提高混凝土结构的耐久性和抗弯承载力。将钢筋布置于远离迎风面、角区的中间位置时,构件耐久寿命比传统的截面单一钢筋配筋方式延长1.19倍,耐久性达到最佳效果;随GFRP筋与钢筋面积比的增加,构件抗弯承载力提高的百分比最大可达到52.7%,且抗弯承载力随面积比的增加而增大。
In order to study the durability and flexural performance of GFRP tendon-reinforced concrete reinforced concrete slab, the concrete surface depth of carbonation reached the sign of steel reinforcement, combined with the formula of least-mean-time to depassivation of steel surface, GFRP tendons - durability of reinforced concrete slabs. The formulas for calculating the flexural bearing capacity of GFRP tendon - reinforced concrete slab with proper reinforcement failure were deduced. Based on the formula of flexural capacity calculated, the flexural strength of seven groups with the same overall reinforcement ratio, different GFRP tendons and reinforcement area ratio The flexural capacity of hybrid slab is calculated. The results show that: GFRP tendons and steel reasonable mixed arrangement, can greatly improve the durability of concrete structures and flexural capacity. When the reinforcement is arranged in the middle away from the windward surface and the corner area, the durable life of the component is 1.19 times longer than that of the traditional single-section steel reinforcement and the durability is optimized. With the increase of the area ratio of the GFRP reinforcement to the reinforcement, The maximum percentage of flexural capacity increases up to 52.7%, and the flexural capacity increases with the increase of area ratio.