纤维布加固锈蚀混凝土柱抗剪承载力的试验研究  

SHEAR STRENGTH OF CORRODED REINFORCED CONCRETE COLUMN WRAPPED BY FIBER SHEET WITH LARGE DUCTILITY

作　　者：张闯[1] 张大伟[1] 赵羽习[1] 段安[1] 

机构地区：[1]浙江大学结构工程研究所,杭州310058

出　　处：《工业建筑》2016年第7期183-187,共5页Industrial Construction

基　　金：中央高校基本科研业务费专项资金资助项目(2015FZA4018;2015FZA4019);交通运输部建设科技项目(2014 318 494 020)

摘　　要：采用复材对苯二甲酸乙二醇酯(PET)纤维布对不同箍筋锈蚀程度混凝土方柱进行外包加固。通过水平低周往复加载的方式,研究了PET纤维布外包损伤钢筋混凝土柱的约束机理,并通过试验结果分析了箍筋锈蚀对柱进行PET纤维布抗剪加固的影响。试验结果表明:随着箍筋锈蚀率的增大,柱的抗剪承载力下降;损伤钢筋混凝土柱在经过PET纤维布加固后,试验柱的极限承载力得到了明显提高,但PET纤维布的利用率随着箍筋锈蚀率的增大而降低。根据试验结果分析,提出考虑箍筋锈蚀率的PET纤维布抗剪折减系数k_(pf)和PET纤维布加固锈蚀钢筋混凝土柱受剪承载力计算模型,计算值与试验值吻合较好。Polyeethylene Terephthalate（ PET） fibers were used to strengthen RC columns with corroded stirrups.Cyclic loading tests were conducted for RC column specimens to investigate the effect of PET wrapping and stirrup corrosion. It was concluded that the shear strength of the specimens decraeased with increasing of degree of corrosion of stirrups,while the ultimate bearing capacity was enhanced obviously after PET sheet strengthening. The efficiency of PET wrapping decrased with increase of degree of corrosion of stirrups. Based on the test results,a reduction factor k_（pf） reflecting effect of corrosion and shear strength prediction model of the corroded RC columns after PET wrapping were proposed,whose calculated results agreed well with test values.

关 键 词：大延性 纤维布 箍筋锈蚀 低周往复荷载 剪切强度 

分 类 号：TU375.3[建筑科学—结构工程]