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玻璃纤维增强树脂(GFRP)-混凝土组合梁由上部混凝土板和下部GFRP型材以及连接二者的抗剪连接件组成。开展了2根GFRP-混凝土组合梁(非预应力及施加体外预应力组合梁各1根)在1年持续载荷下行为的试验研究。考虑混凝土收缩徐变及GFRP型材蠕变耦合的影响,开展了50年的24根GFRP-混凝土组合梁时随有限元参数分析。结果表明:在1年持续载荷下,非预应力与施加体外预应力组合梁长期挠度分别为其初始挠度的1.42倍及2.91倍;非预应力与预应力组合梁中连接件的长期滑移分别为0.230mm及0.164mm,相比初始滑移2种组合梁的最终滑移分别增加了53.3%和58.2%;50年后,非预应力组合梁长期挠度与初始挠度的比值在1.50~1.56之间;而施加体外预应力组合梁长期挠度与初始挠度的比值在3.03~6.08之间。基于以上研究提出了GFRP-混凝土组合梁长期挠度的计算建议。
Glass Fiber Reinforced Resin (GFRP) - A concrete composite beam consists of an upper concrete slab and a lower GFRP profile, together with a shear connection connecting the two. The experimental research on the behavior of two GFRP-concrete composite beams (one non-prestressed and one externally applied prestressed composite beam) under 1-year sustained load was carried out. Considering the effect of concrete shrinkage and creep and the creep coupling of GFRP profiles, the FEA analysis of 24 GFRP-concrete composite beams during 50 years was carried out. The results show that the long-term deflections of non-prestressed and externally prestressed composite beams are 1.42 times and 2.91 times of their initial deflections at 1-year continuous loads respectively. The long-term slip of non-prestressed and prestressed composite beams Which is 0.230mm and 0.164mm, respectively, increased by 53.3% and 58.2% respectively compared with the initial slip of the two kinds of composite beams. After 50 years, the ratio of long-term deflection and initial deflection of non-prestressed composite beams was between 1.50 and 1.56 While the ratio of long-term deflection and initial deflection of externally applied prestressed composite beams is between 3.03 and 6.08. Based on the above research, the long-term deflection of GFRP-concrete composite beams is proposed.