Axial performance of hollow concrete columns reinforced with GFRP composite bars with different reinforcement ratios
Axial performance of hollow concrete columns reinforced with GFRP composite bars with different reinforcement ratios
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DOI：
10.1016/j.compstruct.2019.01.096
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发表时间：
2019-04-01
影响因子：
6.3
通讯作者：
Mendis, Priyan
中科院分区：
文献类型：
--
作者：
AlAjarmeh, Omar S.;Manalo, Allan C.;Mendis, Priyan
空心混凝土柱 (HCC) 是一种结构高效的建筑系统，并且使用的材料较少。传统上，HCC 是用钢筋加固的，但钢筋很容易腐蚀。本研究探讨了使用玻璃纤维增强聚合物 (GFRP) 复合材料棒作为 HCC 的增强材料，并评估了增强比例对 HCC 结构行为的影响。总共制备了六种用不同配筋率（1.78%、1.86%、2.67%、2.79%、3.72 和 4.00%）的 GFRP 筋纵向加固的 HCC，并研究了它们的行为。通过改变钢筋直径（12.7 毫米、15.9 毫米和 19.1 毫米）和钢筋数量（4、6、8 和 9 根钢筋）来实现不同的配筋率。结果表明，增加钢筋的直径和数量可以提高 HCC 的强度、延展性和约束效率。对于具有相同配筋率的柱，使用更多且更小直径的 GFRP 钢筋比使用更少和更大直径钢筋的柱的约束效率高 12%。嵌入 HCC 的 GFRP 棒的压碎应变为极限拉伸应变的 52.1%。最后，通过考虑混凝土的贡献以及高达 3000 i ca 的贡献，可以可靠地预测 GFRP 增强 HCC 的轴向载荷能力。在纵向钢筋中。
A hollow concrete column (HCC) is a structurally efficient construction system and uses less material. Conventionally, HCCs are reinforced with steel bars, which are prone to corrosion. This study explored the use of glass-fiber-reinforced-polymer (GFRP) composite bars as reinforcement for HCCs and evaluated the effect of the reinforcement ratio on HCC structural behavior. A total of six HCCs reinforced longitudinally with GFRP bars with different reinforcement ratios (1.78%, 1.86%, 2.67%, 2.79%, 3.72, and 4.00%) were prepared and their behavior was investigated. The different reinforcement ratios were achieved by changing the bar diameter (12.7 mm, 15.9 mm, and 19.1 mm) and number of bars (4, 6, 8, and 9 bars). The results show that increasing the diameter and number of bars enhanced the strength, ductility and confinement efficiency of HCC. For columns with equal reinforcement ratios, using more and smaller-diameter GFRP bars yielded 12% higher confinement efficiency than in the columns with fewer and larger-diameter bars. The crushing strain of the GFRP bars embedded the HCC was 52.1% of the ultimate tensile strain. Lastly, the axial-load capacity of the GFRP-reinforced HCC can be reliably predicted by considering the contribution of the concrete and up to 3000 i ca . in the longitudinal reinforcement.