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（1 湖南大學(xué)土木工程學(xué)院， 長(zhǎng)沙 410082；2 工程結(jié)構(gòu)損傷診斷湖南省重點(diǎn)實(shí)驗(yàn)室（湖南大學(xué)）， 長(zhǎng)沙 410082）

［摘要］為了研究鋼筋、玄武巖增強(qiáng)復(fù)合材料（BFRP）包裹層數(shù)及預(yù)損傷對(duì)BFRP約束鋼筋混凝土（RC）圓柱軸壓力學(xué)性能的影響，對(duì)22個(gè)直徑242mm、高726mm的混凝土圓柱（包括20個(gè)RC圓柱以及2個(gè)素混凝土圓柱）開展軸壓試驗(yàn)。試驗(yàn)結(jié)果表明：縱筋對(duì)BFRP約束RC圓柱的極限強(qiáng)度有較明顯貢獻(xiàn)，箍筋對(duì)BFRP約束RC圓柱極限強(qiáng)度和極限應(yīng)變均有較明顯貢獻(xiàn)；BFRP約束可有效改善損傷RC圓柱的極限強(qiáng)度和極限應(yīng)變，但無法恢復(fù)RC圓柱因損傷而降低的初始剛度；損傷會(huì)降低BFRP約束RC圓柱的極限強(qiáng)度和初始剛度，且降低的程度隨著損傷水平的增加而增加。最后，提出了BFRP約束損傷RC圓柱強(qiáng)度模型及極限應(yīng)變模型，模型預(yù)測(cè)值與試驗(yàn)值吻合較好。

［關(guān)鍵詞］鋼筋混凝土圓柱； BFRP； 預(yù)損傷； 強(qiáng)度模型； 極限應(yīng)變模型

中圖分類號(hào)：TU375-3文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)02-0119-06

Study on axial compressive mechanical behavior of damaged reinforced concrete cylinder columns confined with BFRP

MA Gao1,2, ZOU Yafeng1, HE Qingfeng1, WU Longfei1

(1 College of Civil Engineering, Hunan University, Changsha 410082, China; 2 Hunan Provincial Key Lab on Damage Diagnosis for Engineering Structures (Hunan University), Changsha 410082, China)

Abstract:To study the influences of steel bars, basalt fiber reinforced polymer (BFRP) layers and pre-damaged levels on axial compressive mechanical behavior of reinforced concrete (RC) cylinder columns, axial compression tests on 22 concrete columns with a diameter of 242mm and a height of 726mm (including 20 RC cylinder columns and 2 plain concrete cylinder columns) were carried out. The experimental results show that the longitudinal reinforcements have obvious contribution to the ultimate strength of BFRP-confined RC cylinder columns, and the stirrups have noticeable contribution to both the ultimate strength and ultimate strain of BFRP-confined RC cylinder columns. The ultimate strength and ultimate strain of the damaged RC cylinder columns reduced by the damage can be effectively improved by BFRP confinement, but the initial stiffness of RC cylinder columns reduced by the damage cannot be restored. The ultimate strength and initial stiffness of the BFRP-confined RC cylinder columns were reduced due to damage, and the degree of reduction increases with the increase of the damaged level. The strength model and ultimate strain model of BFRP-confined damaged RC cylinder columns were proposed, and the predictive results are in good agreement with the experimental results.

Keywords:reinforced concrete cylinder column; basalt fiber reinforced polymer; pre-damage; strength model; ultimate strain model

*國(guó)家自然科學(xué)基金項(xiàng)目（51878268），湖南省自然科學(xué)基金項(xiàng)目（2020JJ4195），既有工業(yè)建筑非工業(yè)化改造技術(shù)研究（2016YFC0701308）。

作者簡(jiǎn)介：馬高，博士，副教授，博士生導(dǎo)師，Email：magao@hnu.edu.cn。