1年持续载荷下GFRP-混凝土组合梁长期性能试验

发布时间：2018-06-28 00:55

本文选题：GFRP-混凝土组合梁 + 混凝土收缩徐变　；参考：《复合材料学报》2016年05期

【摘要】：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。
[Abstract]:Glass fiber reinforced resin (GFRP)-concrete composite beams are composed of upper concrete slabs, GFRP profiles and shear connectors. The behavior of two GFRP- concrete composite beams (1 unprestressed beam and 1 externally prestressed composite beam) under continuous load for one year was studied. Considering the effect of shrinkage and creep of concrete and creep coupling of GFRP profile, 24 GFRP- concrete composite beams were analyzed with finite element method. The results show that the long-term deflection of unprestressed and externally prestressed composite beams is 1.42 and 2.91 times of its initial deflection respectively under one year continuous load. The long-term slippage of joints in unprestressed and prestressed composite beams is 0.230mm and 0.164mm respectively, which is 53.3% and 58.2% higher than that of initial slippage respectively, and the ratio of long-term deflection to initial deflection of unprestressed composite beams is between 1.50 and 1.56 after 50 years. The ratio of long-term deflection to initial deflection of externally prestressed composite beam is between 3.03 and 6.08. Based on the above research, the calculation suggestion of long-term deflection of GFRP-concrete composite beam is put forward.
【作者单位】：同济大学建筑工程系;
【基金】：国家“973”计划(2012CB026200)
【分类号】：TU398.9

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