大尺寸鋼筋高強(qiáng)混凝土柱的軸心受壓性能*
符佳，杜修力，張建偉
- 摘 要
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符佳，杜修力，張建偉(北京工業(yè)大學(xué)城市與工程安全減災(zāi)省部共建教育部重點(diǎn)實(shí)驗(yàn)室， 北京 100124)［摘要］鋼筋混凝土構(gòu)件存在尺寸效應(yīng)現(xiàn)象，為了解大尺寸鋼筋高強(qiáng)混凝土柱的軸心受壓性能及其尺寸效應(yīng)規(guī)律，使用40 000kN多功能壓力機(jī)進(jìn)行不同幾何尺寸和不同配箍率的鋼筋高強(qiáng)混凝土柱軸心受壓性能試驗(yàn)。在試驗(yàn)基礎(chǔ)上，對(duì)比分析了不同幾何尺寸、不同配箍率的各試件破壞特征、極限承載力和變形。結(jié)果表明，大尺寸鋼筋高強(qiáng)混凝土柱軸心受壓承載力具有一定的尺寸效應(yīng)，變形能力尺寸效應(yīng)明顯，配箍率對(duì)其承載力及變形能力存在不同程度的影響。［關(guān)鍵詞］鋼筋高強(qiáng)混凝土柱； 配箍率； 軸心受壓性能； 尺寸效應(yīng)； 單調(diào)加載試驗(yàn)中圖分類號(hào)：TU398.7 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2013)05-0077-05Mechanical properties of large-size high-strength reinforced concrete columns under axial compressionFu Jia, Du Xiuli, Zhang Jianwei(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China)Abstract: In order to reveal the size effect law and the axial compression performance of large-size high-strength reinforced concrete columns, axial compression experiments of high-strength reinforced concrete columns with different geometric dimensions and stirrup ratio were carried out under 40 000kN multi-function press. Based on the experiments, the failure characteristic, the ultimate bearing capacity and the deformation of large\|size high\|strength reinforced concrete with different geometric dimensions and stirrup ratio were obtained. The results show that as to high-strength reinforced concrete columns with stirrups under axial loading, size effect exists in maximum carrying capacity and deformation capacity. Stirrup ratio has varying degrees of impact on maximum carrying capacity and deformation capacity.Keywords: high-strength reinforced concrete column; stirrup ratio; axial compression performance; size effect; monotonic loading test*國(guó)家自然科學(xué)基金重點(diǎn)項(xiàng)目（50838001），北京市優(yōu)秀人才培養(yǎng)項(xiàng)目（20081D051500182），北京市高校中青年骨干人才培養(yǎng)計(jì)劃資助項(xiàng)目(PHR201108009)作者簡(jiǎn)介：符佳，博士研究生，Email:grace516@emails.bjut.cn。參考文獻(xiàn)［1］MAIHOTRA V M. Are 4×8 inch concrete cylinders as good as 6×12 inch cylinders for quality control of concrete? ［J］. ACI Structural Journal, 1976, 73(1): 33-36.［2］SABINS G M, MIRZA S M. Size effects in model concrete［J］. Journal of the Structural Division, 1979, 105(6):1007-1020.［3］LESSARD M, CHALLAL O, AITCIN P C. Testing high strength concrete compressive strength［J］. ACI Materials Journal, 1993, 90(4):303-308.［4］中國(guó)土木工程學(xué)會(huì)高強(qiáng)混凝土委員會(huì). 高強(qiáng)混凝土結(jié)構(gòu)設(shè)計(jì)與施工指南［M］. 北京: 中國(guó)建筑工業(yè)出版社, l994.［5］黃煜鑌．混凝土脆性與力學(xué)參數(shù)的尺寸效應(yīng)及其相互關(guān)系的研究［D］. 重慶: 重慶大學(xué), 2002.［6］BAZANT Z P, KWON Y W. Failure of slender and stocky reinforced concrete columns: tests of size effect ［J］. Materials and Structures, 1994, 27(166): 7990.［7］MICHELE B, BAZANT Z P. Size effect in concrete columns: finite-element analysis with microplane model ［J］. Journal of Structural Engineering, 2001,127(12): 1382-1390.［8］NEMECEK J, BITTNAR Z. Experimental investigation and numerical simulation of postpeak behavior and size effect of reinforced concrete columns ［J］. Materials and Structures/Materiaux et Constructions, 2004, 37(267): 161-169.［9］SENE S, BARR B I G, ABUSIAF H F. Size effect in axially loaded reinforced concrete columns［J］. Journal of Structural Engineering, 2004, 130(4): 662-670.［10］杜修力,符佳,張建偉. 鋼筋混凝土柱軸心受壓性能尺寸效應(yīng)的大比尺試驗(yàn)研究［J］. 土木工程學(xué)報(bào), 2010,43(S2): 1-8.［11］GB 50010—2010 混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范［S］. 北京: 中國(guó)建筑工業(yè)出版社, 2011.
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