摘要
通过对2根预应力钢带加固钢筋混凝土柱与2根未加固钢筋混凝土柱的力学性能进行对比试验,研究预应力钢带加固对钢筋混凝土轴心受压柱、偏心受压柱的破坏形态、承载力、刚度、变形能力的影响。试验结果表明：预应力钢带加固钢筋混凝土柱的破坏形态与未加固试件基本相同,但加固试件初裂荷载更大;加固后钢筋混凝土轴心受压试件、偏心受压试件承载力分别提高24%、20%,承载力提升效果显著;预应力钢带加固对轴心受压试件轴向刚度明显提高,从初始加载到荷载达到80%极限荷载的不同加载水平下,加固后轴压试件的轴向刚度与未加固试件轴向刚度的比值在1.12~1.18;经预应力钢带加固后,偏心受压试件极限荷载对应的侧向挠度增大了37%,偏压试件变形能力明显增强。
The mechanical behavior tests of two reinforced concrete columns strengthened by prestressed steel strips and two other comparative reinforced concrete columns without being strengthened were carried out to study the influence of prestressed steel strips on failure mode,bearing capacity,rigidity and deformation property of reinforced concrete under axial or eccentric load. Experimental results showed that the typical failure mode of reinforced concrete columns strengthened by prestressed steel strips were almost the same as that without being strengthened,but the incipient crack load became larger. The bearing capacity of specimens strengthened by prestressed steel strips under axial or eccentric load could be enhanced by 24% or 20%,respectively. In various loading states from the initial loading to 80% ultimate loading,the ratio of axial rigidity of axial compression specimen strengthened by prestressed steel strips ranged from 1. 12 to 1. 18. The lateral deflection of reinforced concrete columns strengthened by prestressed steel strips under eccentric load was increased by 37% as well as the deformability enhanced obviously.The effect of strengthening of prestressed steel strips was remarkable.
出处
《工业建筑》
CSCD
北大核心
2016年第3期155-159,共5页
Industrial Construction
基金
国家自然科学基金项目(51178226)
宁波市结构工程重点学科项目(XKL14D2072)
关键词
预应力钢带
钢筋混凝土柱
加固修复
prestressed steel strip
reinforced concrete columns
strengthened rehabilitation
