CFRP加固钢筋再生混凝土梁的弯曲性能研究
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摘要
为研究再生混凝土梁的弯曲性能,进行了钢筋再生混凝土梁及其经CFRP加固后的受弯性能试验研究,分析了再生粗骨料取代率和CFRP加固层数对再生混凝土梁受力性能的影响,比较了钢筋再生混凝土梁加固前后的挠度和裂缝扩展情况。试验结果表明:再生混凝土梁的变形能力和受弯承载力较普通混凝土梁没有明显降低,但其刚度和延性均有所降低,可通过CFRP加固提高其刚度和极限荷载,但不能改善其变形能力; CFRP加固层数对钢筋再生混凝土梁的开裂荷载、屈服荷载和极限荷载影响较大,其中极限荷载受加固层数影响最大。通过理论计算和有限元分析,建立了钢筋再生混凝土梁及其经CFRP加固后的受弯承载力计算式,理论计算结果与钢筋再生混凝土梁的试验结果符合较好。研究成果可为再生混凝土梁的工程应用提供参考依据。
To investigate the flexural behavior of reinforced recycled aggregate concrete (RAC) beams,experimental studies were conducted and test parameters included replacement ratio of recycled coarse aggregate (RCA) and layers of carbon fiber reinforced polymer (CFRP) sheets. The deflection and crack development of reinforced recycled aggregate concrete beam before and after strengthening was compared. The results show that there is no obvious difference in ultimate load and deformability of the beams with or without RCA replacement,but the stiffness and ductility of the beam degrade with the RCA replacement. However,except for deformability,the stiffness and load carrying capacity can both be improved by CFRP reinforcement. The results also show that the crack load,yield load and the ultimate load all increase with the increasing layers of CFRP reinforcing arrangement,and among the effect of CFRP strengthening,the ultimate load is most pronounced. In addition,the theoritical calculation and finite element analysis to estimate the ultimate load for the CFRP strengthened beams are presented and the results agree well with the experimental ones,which can be used as a valuable reference for the application of recycled concrete beams in civil engineering.
To investigate the flexural behavior of reinforced recycled aggregate concrete (RAC) beams,experimental studies were conducted and test parameters included replacement ratio of recycled coarse aggregate (RCA) and layers of carbon fiber reinforced polymer (CFRP) sheets. The deflection and crack development of reinforced recycled aggregate concrete beam before and after strengthening was compared. The results show that there is no obvious difference in ultimate load and deformability of the beams with or without RCA replacement,but the stiffness and ductility of the beam degrade with the RCA replacement. However,except for deformability,the stiffness and load carrying capacity can both be improved by CFRP reinforcement. The results also show that the crack load,yield load and the ultimate load all increase with the increasing layers of CFRP reinforcing arrangement,and among the effect of CFRP strengthening,the ultimate load is most pronounced. In addition,the theoritical calculation and finite element analysis to estimate the ultimate load for the CFRP strengthened beams are presented and the results agree well with the experimental ones,which can be used as a valuable reference for the application of recycled concrete beams in civil engineering.
引文
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[15]SEARA-PAZ S,GONZALEZ-FONTEBOA B,MARTINEZ-ABELLA F,et al.Flexural performance of reinforced concrete beams made with recycled concrete coarse aggregate[J].Engineering Structures,2018,156:32-45.
[16]LIU H X,YANG J W,WANG X Z,et al.Experimental study on shear behavior of BFRP-reinforced recycled aggregate concrete deep beams without stirrups[J].KSCE Journal of Civil Engineering,2017,21(6):2289-2299.
[17]YAZDANBAKHSH A,BANK L C.The effect of shear strength on load capacity of FRP strengthened beams with recycled concrete aggregate[J].Construction and Building Materials,2016,102:133-140.
[18]梁金福,燕柳斌,赵君君,等.CFRP板条嵌入式加固钢筋混凝土梁抗弯性能试验研究[J].工业建筑,2009,39(2):100-117.(LIANG Jinfu,YAN Liubin,ZHAO Junjun,et al.Experimental study of bending performance of RC beams strengthened with nearsurface mounted CFRP plate[J].Industrial Construction,2009,39(2):100-117.(in Chinese))
[19]曾宪桃,成香莉,高保彬.内嵌碳纤维增强塑料板条抗弯加固混凝土梁试验研究[J].工程力学,2008,25(12):106-122.(ZENG Xiantao,CHENGXiangli,GUO Baobin.Experimental study on flexural characteristics of RC beams strengthened with nearsurface mounted CFRP laminates[J].Engineering Mechanics,2008,25(12):106-122.(in Chinese))
[20]肖建庄,雷斌,黄健,等.再生混凝土梁抗弯理论与可靠度分析[J].东南大学学报(自然科学版),2010,40(6):1247-1251.(XIAO Jianzhuang,LEIBin,HUANG Jian,et al.Bending theory and reliability of recycled concrete beams[J].Journal of Southeast University(Natural Science Edition),2010,40(6):1247-1251.(in Chinese))
[21]过镇海,张秀琴,张大成,等.混凝土应力-应变全曲线的试验研究[J].建筑结构学报,1982,3(1):1-12.(GUO Zhenhai,ZHANG Xiuqin,ZHANGDacheng,et al.Experimental investigation of the complete stress-strain curve of concrete[J].Journal of Building Structures,1982,3(1):1-12.(in Chinese))
[22]OBAIDAT Y T,HEYDEN S,DAHLBLOM O.The effect of CFRP and CFRP/concrete interface models when modelling retrofitted RC beams with FEM[J].Composite Structures,2010,92(6):1391-1398.
[23]胡琼,严佳川,邹超英.再生混凝土梁正截面受弯承载力计算模式研究[J].四川大学学报(工程科学版),2009,41(3):195-201.(HU Qiong,YANJiachuan,ZOU Chaoying.Calculation model of flexural capacity of normal section of the recycled concrete beam[J].Journal of Sichuan University(Engineering Science Edition),2009,41(3):195-201.(in Chinese))
[2]FALESCHINI F,Zanini M A,PELLEGRINO C,et al.Sustainable management and supply of natural and recycled aggregates in a medium-size integrated plant[J].Waste Management,2016,49:146-155.
[3]刘超,白国良,张玉,等.再生混凝土梁斜裂缝宽度试验研究[J].建筑结构学报,2016,37(增刊2):16-23.(LIU Chao,BAI Guoliang,ZHANG Yu,et al.Experimental study on widths of diagonal cracks of recycled aggregate concrete beams[J].Journal of Building Structures,2016,37(Suppl.2):16-23.(in Chinese))
[4]KONG D,LEI T,ZHENG J,et al.Effect and mechanism of surface-coating pozzalanics materials around aggregate on properties and ITZ microstructure of recycled aggregate concrete[J].Construction and Building Materials,2010,24:701-708.
[5]RANGEL C S,AMARIO M,PEPE M,et al.Tension stiffening approach for interface characterization in recycled aggregate concrete[J].Cement and Concrete Composites,2017,82:176-189.
[6]TAM V W Y,GAO X F,TAM C M.Microstructural analysis of recycled aggregate concrete produced from two-stage mixing approach[J].Cement and Concrete Research,2005,35(6):1195-1203.
[7]董江峰,袁书成,侯敏,等.中空夹层钢管再生混凝土短柱受压性能分析[J].建筑材料学报,2014,17(4):627-633.(DONG Jiangfeng,YUAN Shucheng,HOU Min,et al.Mechanical behavior of recycled aggregate concrete filled double skin steel tube columns[J].Journal of Building Materilas,2014,17(4):627-633.(in Chinese))
[8]TAHAR Z,NGO T,KADRI E H,et al.Effect of cement and mixture on the utilization of recycled aggregate in concrete[J].Construction and Building Materials,2017,149:91-102.
[9]ZHANG Z,ZHANG Y,YAN C,et al.Influence of crushing index on properties of recycled aggregates pervious concrete[J].Construction and Building Materials,2017,135:112-118.
[10]陈宗平,周春恒,梁莹,等.高温后钢筋再生混凝土梁受力性能试验及承载力计算[J].建筑结构学报,2017,38(4):98-108.(CHEN Zongping,ZHOUChunheng,LIANG Ying,et al.Mechanical behavior and calculation on bearing capacity of reinforced recycled aggregate concrete beam after elevated temperature[J].Journal of Building Structures,2017,38(4):98-108.(in Chinese))
[11]曹万林,巩晓雪,叶涛萍,等.不同再生骨料取代率的再生混凝土梁受弯性能试验研究[J].自然灾害学报,2017,26(4):10-18.(CAO Wanlin,GONGXiaoxue,YE Taoping,et al.Experiment of the flexural performance of recycled concrete beams with different recycled aggregate replecement ratios[J].Journal of Natural Disasters,2017,26(4):10-18.(in Chinese))
[12]陈爱玖,王璇,解伟,等.再生混凝土梁受弯性能试验研究[J].建筑材料学报,2015,18(4):589-595.(CHEN Aijiu,WANG Xuan,XIE Wei,et al.Experimental research on flexural property of recycled concrete beam[J].Journal of Building Materials,2015,18(4):589-595.(in Chinese))
[13]胡琼,黄清,邹超英.部分再生混凝土梁的试验[J].哈尔滨工业大学学报,2009,41(6):38-42.(HU Qiong,HUANG Qing,ZOU Chaoying.Experimental study on partial recycled concrete beams[J].Journal of Harbin Institute of Technology,2009,41(6):38-42.(in Chinese))
[14]KNAACK A M,KURAMA Y C,ASCE M.Behavior of reinforced concrete beams with recycled concrete coarse aggregates[J].Journal of Structural Engineering,2015,141(3):B4014009.
[15]SEARA-PAZ S,GONZALEZ-FONTEBOA B,MARTINEZ-ABELLA F,et al.Flexural performance of reinforced concrete beams made with recycled concrete coarse aggregate[J].Engineering Structures,2018,156:32-45.
[16]LIU H X,YANG J W,WANG X Z,et al.Experimental study on shear behavior of BFRP-reinforced recycled aggregate concrete deep beams without stirrups[J].KSCE Journal of Civil Engineering,2017,21(6):2289-2299.
[17]YAZDANBAKHSH A,BANK L C.The effect of shear strength on load capacity of FRP strengthened beams with recycled concrete aggregate[J].Construction and Building Materials,2016,102:133-140.
[18]梁金福,燕柳斌,赵君君,等.CFRP板条嵌入式加固钢筋混凝土梁抗弯性能试验研究[J].工业建筑,2009,39(2):100-117.(LIANG Jinfu,YAN Liubin,ZHAO Junjun,et al.Experimental study of bending performance of RC beams strengthened with nearsurface mounted CFRP plate[J].Industrial Construction,2009,39(2):100-117.(in Chinese))
[19]曾宪桃,成香莉,高保彬.内嵌碳纤维增强塑料板条抗弯加固混凝土梁试验研究[J].工程力学,2008,25(12):106-122.(ZENG Xiantao,CHENGXiangli,GUO Baobin.Experimental study on flexural characteristics of RC beams strengthened with nearsurface mounted CFRP laminates[J].Engineering Mechanics,2008,25(12):106-122.(in Chinese))
[20]肖建庄,雷斌,黄健,等.再生混凝土梁抗弯理论与可靠度分析[J].东南大学学报(自然科学版),2010,40(6):1247-1251.(XIAO Jianzhuang,LEIBin,HUANG Jian,et al.Bending theory and reliability of recycled concrete beams[J].Journal of Southeast University(Natural Science Edition),2010,40(6):1247-1251.(in Chinese))
[21]过镇海,张秀琴,张大成,等.混凝土应力-应变全曲线的试验研究[J].建筑结构学报,1982,3(1):1-12.(GUO Zhenhai,ZHANG Xiuqin,ZHANGDacheng,et al.Experimental investigation of the complete stress-strain curve of concrete[J].Journal of Building Structures,1982,3(1):1-12.(in Chinese))
[22]OBAIDAT Y T,HEYDEN S,DAHLBLOM O.The effect of CFRP and CFRP/concrete interface models when modelling retrofitted RC beams with FEM[J].Composite Structures,2010,92(6):1391-1398.
[23]胡琼,严佳川,邹超英.再生混凝土梁正截面受弯承载力计算模式研究[J].四川大学学报(工程科学版),2009,41(3):195-201.(HU Qiong,YANJiachuan,ZOU Chaoying.Calculation model of flexural capacity of normal section of the recycled concrete beam[J].Journal of Sichuan University(Engineering Science Edition),2009,41(3):195-201.(in Chinese))