Strengthening of steel members in compression by mortar-filled FRP tubes
Strengthening of steel members in compression by mortar-filled FRP tubes
复制标题
砂浆填充 FRP 管对钢构件的抗压加固
DOI：
10.1016/j.tws.2012.11.001
复制
发表时间：
2013-03-01
影响因子：
6.4
通讯作者：
Ye, Lieping
中科院分区：
文献类型：
--
作者：
Feng, Peng;Zhang, Yanhua;Ye, Lieping
本文介绍了一种提高钢构件抗压屈曲性能的加固方法，即在钢构件外部套上一根填充砂浆的FRP管，在管的端部用FRP布包裹。通过对18个双向对称截面试件的轴压试验，得到了试件的荷载应变发展规律和破坏形态，提高了试件的承载能力和延性。研究了芯钢截面大小、长细比和端部包裹玻璃钢布层数对试件性能的影响。结果表明，加固后构件的破坏模式由钢构件中高度处的整体屈曲破坏转变为钢端的局部破坏。结果表明，其承载能力提高44-215%，延性提高877%。建立了加固试件的分段模型，计算结果与试验结果吻合较好。(C)2012爱思唯尔有限公司。保留所有权利。
A strengthening approach to improve the buckling resistance of steel members in compression is introduced in this paper, where a mortar-filled FRP tube is sleeved outside the steel member and wrapped with FRP fabrics at the ends of the tube. Through axial compression tests on 18 specimens with bi-axial symmetrical cross-section, the load-strain development and failure modes were obtained and improved load bearing capacity and ductility were evidenced. The effects of the cross-section of core steel, slenderness and FRP fabric layers wrapped at the ends of specimens were investigated. It was found that, after strengthening, the failure modes changed from steel yielding at the mid-height of the steel member due to global buckling to local damage at the steel end. As a result, the load bearing capacity increased by 44-215% and ductility increased by up to 877%. The segmentation model was developed for strengthened specimens, by which the calculated load bearing capacity agrees well with the experimental result. (C) 2012 Elsevier Ltd. All rights reserved.