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（1 蘭州交通大學(xué)道橋工程災(zāi)害防治技術(shù)國家地方聯(lián)合工程實(shí)驗(yàn)室， 蘭州 730070； 2 甘肅恒路交通勘察設(shè)計(jì)院有限公司， 蘭州 730070；  3 中鐵二十一局集團(tuán)有限公司， 蘭州 730070）

［摘要］為了得到核心混凝土缺陷率與缺陷位置對(duì)鋼管混凝土構(gòu)件承載力的影響規(guī)律，進(jìn)行了27根不同缺陷率與缺陷位置的鋼管混凝土構(gòu)件承載力試驗(yàn)。試驗(yàn)分析結(jié)果得出：缺陷率相同的條件下，中心位置缺陷時(shí)，鋼管混凝土構(gòu)件承載力損失較小，管壁側(cè)位置缺陷時(shí)，鋼管混凝土構(gòu)件承載力損失較大； 缺陷率為5%時(shí)，中心位置缺陷試件較無缺陷試件承載力損失14%，管壁側(cè)缺陷試件較無缺陷試件承載力損失0%； 缺陷率為20%時(shí)，中心位置缺陷試件較無缺陷試件承載力損失35%，管壁側(cè)位置缺陷試件較無缺陷試件承載力損失59%； 缺陷位置相同時(shí)，缺陷率越大其承載力損失越大，彈塑性階段的歷程越短； 內(nèi)部缺陷對(duì)鋼管混凝土構(gòu)件承載力影響較大，工程中應(yīng)嚴(yán)格控制鋼管混凝土構(gòu)件的內(nèi)部缺陷。

［關(guān)鍵詞］鋼管混凝土； 缺陷率； 缺陷位置； 承載力； 內(nèi)部缺陷

中圖分類號(hào)：TU398-7文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)02-0078-07

Influence of defect rate and location of core concrete on the bearing capacity of concrete-filled steel tubular

ZHANG Rongling1, HAO Zhaofeng1, MA Lina1, NING Guixia1, LI Zhiyang2, GAO Fei3

(1 National and Provincial Joint Engineering Laboratory of Road & Bridge Disaster Prevention and Control, Lanzhou Jiaotong University, Lanzhou 730070, China; 2 Traffic Survey and Design Institute of Gansu Henglu Co., Ltd., Lanzhou 730070, China； 3 China Railway 21st Bureau Group Co., Ltd., Lanzhou 730070, China)

Abstract:In order to obtain the influence law of core concrete defect rate and location on the bearing capacity of concrete-filled steel tubular members, 27 concrete-filled steel tubular members with different defect rate and location were tested. The results show that, under the same defect rate, the bearing capacity loss of concrete-filled steel tubular members is smaller when the center location is defective, and the bearing capacity loss of concrete-filled steel tubular members is larger when the side of the pipe wall location is defective. When the defect rate is 5%, the bearing capacity of the defective specimen at the center position is 14% lower than that without defects, and the bearing capacity of the defective specimen at the side of the pipe wall is 20% lower than that without defects. When the defect rate is 20%, the bearing capacity of the defective specimen at the center position is 35% lower than that without defects, and the bearing capacity of the defective specimen at the side of the pipe wall is 59% lower than that without defects. With the same defect location, the larger the failure rate, the greater the bearing capacity loss and the shorter the elastoplastic stage. Internal defects have a great impact on the bearing capacity of concrete-filled steel tubular members, so internal defects of concrete-filled steel tubular members should be strictly controlled in engineering.

Keywords:concrete-filled steel tube; defect rate; defect location; bearing capacity; internal defect

*國家自然科學(xué)基金(51768033，52068042)，長江學(xué)者和創(chuàng)新團(tuán)隊(duì)發(fā)展計(jì)劃滾動(dòng)支持(IRT_15R29)。

作者簡介：張戎令，博士，教授，碩士生導(dǎo)師，Email: mogzrlggg@163.com。