Strengthening of RC columns by longitudinal CFRP sheets: Effect of strengthening technique
Strengthening of RC columns by longitudinal CFRP sheets: Effect of strengthening technique
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DOI：
10.1016/j.conbuildmat.2015.01.040
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发表时间：
2015-03
影响因子：
7.4
通讯作者：
N. Moshiri;A. Hosseini;D. Mostofinejad
中科院分区：
文献类型：
--
作者：
N. Moshiri;A. Hosseini;D. Mostofinejad
本文研究了纵向碳纤维增强聚合物（CFRP）作为外压加固材料对钢筋混凝土柱性能的影响。为此，浇筑了10根钢筋混凝土柱，其中5根直径为150毫米的圆形柱和5根尺寸为133毫米的方形柱。采用四种不同的方法，包括传统的外粘接加固（EBR）和近表面安装（NSM）技术，以及最近引入的沟槽法（GM）形式的沟槽外粘接加固（EBROG，发音为/ebrΛg/）和沟槽内外粘接加固（EBRIG，发音为/ EBRIG /）技术，对CFRP压缩试样进行了加固。对试件进行了单调单轴压缩试验，综合讨论了不同加固技术的效果。此外，采用基于图像的变形测量技术，即颗粒图像测速（PIV），进一步研究了纵向CFRP片材与混凝土基材之间的应力传递。试验结果表明，采用沟槽法（GM）将CFRP粘结在混凝土表面，可以延缓CFRP的屈曲，从而显著提高CFRP受压加固柱的承载能力。
In the present study, the effect of utilizing longitudinal carbon fiber reinforced polymer (CFRP), as external compression reinforcement, on the behavior of strengthened RC columns is investigated. To do so, 10 RC columns including 5 circular columns with diameter of 150 mm and 5 square columns with dimension of 133 mm were cast. Four different methods including conventional externally bonded reinforcement (EBR) and near surface mounted (NSM) techniques, as well as the recently introduced grooving method (GM) in the forms of externally bonded reinforcement on grooves (EBROG, to be pronounced as /ebrΛg/) and externally bonded reinforcement in grooves (EBRIG, to be pronounced as /ebrIg/) techniques were used to strengthen the specimens in compression with CFRP. The specimens were tested under monotonic uniaxial compression, and different effects of the strengthening techniques were comprehensively discussed. Furthermore, an image-based deformation measurement technique, i.e. particle image velocimetry (PIV) was used to further investigate the stress transfer between longitudinal CFRP sheet and concrete substrate. Experimental results demonstrated that utilizing grooving method (GM) for bonding CFRP to concrete surface postpones the CFRP buckling, and subsequently, a significant increase in load carrying capacity of strengthened RC columns by compression CFRP sheets was observed.