| 1年持续载荷下GFRP-混凝土组合梁长期性能试验 |
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| 引用本文： | 薛伟辰,张士前,梁智殷. 1年持续载荷下GFRP-混凝土组合梁长期性能试验[J]. 复合材料学报, 2016, 33(5): 998-1008. DOI: 10.13801/j.cnki.fhclxb.20160112.004 |
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| 作者姓名： | 薛伟辰 张士前 梁智殷 |
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| 作者单位： | 同济大学 建筑工程系, 上海 200092 |
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| 基金项目： | 国家“973”计划(2012CB026200) |
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| 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0.230 mm及0.164 mm,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。
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| 关 键 词： | GFRP-混凝土组合梁 混凝土收缩徐变 GFRP蠕变 1年持续载荷 长期挠度 有限元参数分析 计算建议 |
| 收稿时间： | 2015-10-27 |
Long-term property test of GFRP-concrete composite beam under sustained load for one year |
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| XUE Weichen,ZHANG Shiqian,LIANG Zhiyin. Long-term property test of GFRP-concrete composite beam under sustained load for one year[J]. Acta Materiae Compositae Sinica, 2016, 33(5): 998-1008. DOI: 10.13801/j.cnki.fhclxb.20160112.004 |
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| Authors: | XUE Weichen ZHANG Shiqian LIANG Zhiyin |
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| Affiliation: | Department of Structural Engineering, Tongji University, Shanghai 200092, China |
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| Abstract: | The glass fiber reinforced plastic (GFRP)-concrete composite beam consists of a concrete slab on the upper side,a GFRP profile on the lower side and shear connectors to connect these two sides.A test study was con-ducted on the behaviors of two GFRP-concrete composite beams (non-prestressed and external prestressed composite beams each had one)under sustained load for one year.A time-dependent finite element parametric analysis of 24 GFRP-concrete composite beams,taking coupling effect of the shrinkage and creep of concrete and creep of GFRP profile into account,was carried out for 50 years.The results show that long-term deflections of the non-prestressed and external prestressed composite beams are 1.42 and 2.91 times of their respective instantaneous deflections under sustained load for one year.The long-term slips of the non-prestressed and external prestressed composite beams are 0.230 mm and 0.164 mm,respectively.Compared with initial slips,the terminal slips of the two composite beams increase by 53.3% and 58.2%,respectively.The ratios of long-term deflection to the instantaneous deflection for the non-prestressed composite beam are between 1.50-1.56 while the ratios of the long-term deflection to the instan-taneous deflection for the external prestressed composite beam are between 3.03-6.08.Based on the above resear-ches,calculation proposals of long-term deflections of GFRP-concrete composite beams were proposed. |
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| Keywords: | GFRP-concrete composite beam concrete shrinkage and creep GFRP creep sustained load for one year long-term deflection finite element parametric analysis calculation proposals |
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