1年持续载荷下GFRP-混凝土组合梁长期性能试验  

Long-term property test of GFRP-concrete composite beam under sustained load for one year

作　　者：薛伟辰[1] 张士前[1] 梁智殷 

机构地区：[1]同济大学建筑工程系,上海200092

出　　处：《复合材料学报》2016年第5期998-1008,共11页Acta Materiae Compositae Sinica

基　　金：国家"973"计划(2012CB026200)

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。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.

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 

分 类 号：TU398.9[建筑科学—结构工程] TB332[一般工业技术—材料科学与工程]