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(1 天津城建大學(xué)，天津市土木建筑結(jié)構(gòu)防護(hù)與加固重點(diǎn)實(shí)驗(yàn)室， 天津 300384；2 天津市地震工程研究所， 天津 300384)

［摘要］基于18根纖維布約束混凝土短柱試驗(yàn)，以纖維布類型、約束纖維布層數(shù)和核心混凝土種類作為試驗(yàn)變量。從破壞形態(tài)、極限強(qiáng)度提高率、約束比、應(yīng)變硬化FRP層數(shù)閾值進(jìn)行分析。試驗(yàn)結(jié)果表明：超高性能混凝土在纖維布約束下破壞為延性破壞，且完整性良好；碳纖維布比玻璃纖維布能更好地提高超高性能混凝土短柱的極限強(qiáng)度；約束比隨著纖維布層數(shù)增加而增大，碳纖維布的約束比大于玻璃纖維布；隨著核心混凝土強(qiáng)度的提高，出現(xiàn)應(yīng)變硬化現(xiàn)象所需要的最小約束比隨之增大，表現(xiàn)為需要纖維布層數(shù)閾值越來越大；極限強(qiáng)度比rσ及極限應(yīng)變與核心混凝土強(qiáng)度呈負(fù)相關(guān)，且都隨著纖維布層數(shù)的增加而增大。 

［關(guān)鍵詞］超高性能混凝土； 纖維布約束； 單軸壓縮試驗(yàn)； 極限強(qiáng)度提高率； 約束比 

中圖分類號：TU528 文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2021)11-0129-07

Study on axial compression performance research on UHPC short columns confined by fiber reinforced polymer

AN  Kaixuan1,  WANG  Xuyue1,  LIU  Zhongxian1,2,  LI  Huiwei1,  WANG  Hailiang1 

(1 Tianjin Key Laboratory of Civil Structure Protection and Reinforcing, Tianjin Chengjian University， Tianjin 300384， China；2 Tianjin Institute of Earthquake Engineering， Tianjin 300384， China) 

Abstract: Based on the experimental study of 18 fiber reinforced polymer (FRP) confined concrete short columns, type of FRP, FRP layers and the types of core concrete were taken as experimental variables. The failure modes, ultimate strength increased rate, confinement ratio, the strain hardening FRP layers threshold analysis results were analyzed. Experimental results show that: FRP confined ultra-high performance concrete (UHPC) short columns feature ductile failure and have good integrity when it is destroyed; the UHPC short columns is better strengthened by carbon fiber reinforced polymer (CFRP) than by glass fiber reinforced polymer (GFRP); the confinement ratio increases with the number of layers of FRP, and the confinement ratio of CFRP is higher than GFRP; with the increase of the strength of core concrete, the minimum confinement ratio required increases for appearing strain hardening, which is reflected by the increase of the strain hardening FRP layers threshold; the ultimate strength ratio (rσ) and ultimate strain of FRP confined concrete short column are negatively correlated with the strength of core concrete and increase with the number of layers of FRP. 

Keywords:ultra-high performance concrete； FRP confined concrete； uniaxial compression test； ultimate strength increased rate； confinement ratio

*國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(2015CB058002)，國家自然科學(xué)基金項(xiàng)目(51578362)。

 作者簡介：安凱旋，碩士研究生，Email:akx8611@126.com；通信作者：王旭月，博士，講師，Email:wangxuyue87@126.com。