聚乙烯醇纤维水泥砂浆钢筋网加固RC柱偏压性能试验研究  

Study on bearing capacity of PVA-ECC steel mesh reinforced concrete column subjected to eccentric load

作　　者：卜良桃[1] 袁超[1] 鲁晨[1] 陶剑剑[1] 

机构地区：[1]湖南大学土木工程学院,长沙410082

出　　处：《建筑结构》2013年第8期82-88,9,共8页Building Structure

基　　金：长沙市科技重点项目(K1109115-11)

摘　　要：针对采用聚乙烯醇纤维水泥砂浆(PVA-ECC)钢筋网加固的RC柱的一次受力偏压性能进行了研究。通过对8根大、小偏心受压柱在单调荷载作用下的对比试验,研究分析了这种加固方法对偏压柱的极限承载力、破坏形态、荷载-挠度曲线及裂缝分布等的影响机理和规律。试验结果表明,PVA-ECC钢筋网薄层加固是一种有效的加固方法,能够较显著地提高偏压RC柱的承载力、峰值应变、延性、刚度及抗裂性能。最后,在考虑截面有效约束区和非有效约束区及界面传递剪力的基础上,建立了PVA-ECC加固钢筋混凝土偏压柱的承载力计算公式。Bearing capacity of polyvinyl alcohol-engineered cementitious composites （PVA-ECC）steel mesh reinforced concrete column subjected to one-off eccentric load was studied. Comparison experiments of 8 specimens including large eccentric columns and small eccentric columns under monotonic loadings were conducted, in which the influence of this kind of strengthening method on ultimate bearing capacity, failure mode, load-deflection curve and the cracking behavior of the columns were analyzed. Results show that PVA-ECC steel mesh technology greatly increases the bearing capacity, peak strain, ductility, stiffness and crack resistance properties of strengthened columns. The formula of bearing capacity of strengthened columns is set up, considering the effectively confined area and the ineffectively confined area in the column section and the transfer of shear force.

关 键 词：聚乙烯醇纤维水泥砂浆 钢筋网 偏压柱 一次受力 承载力 

分 类 号：TU375.3[建筑科学—结构工程]