摘要
为了研究纤维增强材料包裹加固砖柱的轴压性能,进行了42个(14组)玻璃纤维(GFRP)布全长包裹加固砖砌体柱和12个(4组)未加固砖柱的轴压试验,探讨了GFRP布黏贴层数、试件长宽比、未加固试件轴压强度以及倒角半径等因素对加固效果的影响。试验结果表明,由于GFRP布的约束作用,延缓了砖柱初始裂缝的出现,采用GFRP布包裹加固砖柱能明显提高轴压极限强度与峰值应变,加固后试件的极限强度与黏贴层数呈线性关系。在考虑截面有效约束区和非有效约束区的基础上,提出了玻璃纤维布包裹加固砖柱的轴压极限强度与峰值应变的计算公式,计算结果和试验结果吻合较好。
In order to investigate the axial compressive performance of brick masonry columns wrapped by fiber reinforced plastic, forty-two （fourteen groups） brick masonry columns whole along wrapped by glass fiber reinforced plastic （GFRP） sheets for full column height and twelve （four groups） brick masonry columns for comparison were tested under axial compression. The parameters included layers of GFRP sheets, length-width ratio of specimens,ultimate strength of unreinforced specimens, and radius at the corners etc. The experimental results indicate that because of the GFRP confinement, the appearance of initial crack is postponed; GFRP sheet could obviously enhance ultimate axial compression strength and the peak value of brick masonry columns. The ultimate strength of retofitted column appeared to be linearly related to the number of GFRP layers. By considering the effective confinement area and the ineffective confinement area in the column section, an analytical model to predict the ultimate compression strength and peak value of brick masonry columns strengthened with GFRP sheets is developed. The results of the calculation have good agreement with that of experiments.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2009年第2期136-142,共7页
Journal of Building Structures
基金
福建省科技厅青年人才项目(2007F3007)
关键词
玻璃纤维
包裹加固
砖砌体柱
轴压极限强度
峰值应变
有效约束区
glass fiber reinforced plastics
wrapped strengthening
brick masonry column
ultimate axial compression strength
peak value of brick masonry columns
effective controlling area
