玄武岩纤维布约束高温损伤混凝土方柱轴压力学性能试验
|
摘要
对36个玄武岩纤维布增强聚合物基复合材料(BFRP)约束的高温损伤混凝土方柱和15个不同高温损伤的对比试件进行了轴压试验。试验表明,玄武岩纤维布横向约束能改变高温损伤后混凝土方柱的破坏形态,显著提高混凝土方柱的轴压强度和变形能力。其中三层玄武岩纤维布包裹的200℃、400℃、600℃和800℃高温损伤混凝土方柱轴压强度分别提高了48%、130%、206%和389%,轴向变形分别提高了433%、344%、319%和251%。采用典型的纤维增强聚合物基复合材料(FRP)约束常温未损伤混凝土轴压力学性能的设计模型预测FRP约束高温损伤混凝土的轴压强度和变形时存在较大的偏差。通过构建柱状膜结构静水压力平衡模型和约束混凝土方柱与FRP体积应变能平衡模型,分别改进了FRP约束混凝土方柱轴压极限应力和极限应变计算模型的基本形式。基于该基本形式和试验数据,分别确定了BFRP约束高温损伤混凝土方柱轴压极限应力和极限应变计算中与温度相关的参量,提出了适用于高温损伤混凝土方柱的轴压极限应力和极限应变的设计模型。
This paper presents an experimental study on the axial compressive behavior of 36 heat-damaged square columns wrapped by basalt fiber-reinforced polymer(BFRP)sheets and 15 reference columns after different levels of heat damage.The test results indicate that the BFRP confinement can change the failure mode of heat-damaged square columns and significantly enhance the strength and deformation properties of these columns.For the heatdamaged columns wrapped with three layers of BFRP sheets,the axial strengths of these columns after exposuring to 200℃,400℃,600℃ and 800℃ are increased by 48%,130%,206% and 389%,respectively;and the corresponding axial deformation increases are 433%,344%,319% and 251%,respectively.The typical ultimate stress and ultimate strain models for fiber-reinforced polymer(FRP)-confined undamaged concrete are not suitable for FRP-confined heat-damaged concrete.Through establishing the hydrostatic pressure balance equation of the cylindrical FRP membrane as well as proposing the volumetric strain energy models of confined concrete and BFRP sheets,the basic formulas defined for the axial ultimate stress and axial ultimate strain of FRP confined fire-damaged concrete columns are modified.The temperature-dependent variables in the proposed formulas were determinedbased on the presented experimental results,and therefore,design-oriented models were established for axial ultimate stress and axial ultimate strain of FRP-confined heat-damaged square concrete columns.
This paper presents an experimental study on the axial compressive behavior of 36 heat-damaged square columns wrapped by basalt fiber-reinforced polymer(BFRP)sheets and 15 reference columns after different levels of heat damage.The test results indicate that the BFRP confinement can change the failure mode of heat-damaged square columns and significantly enhance the strength and deformation properties of these columns.For the heatdamaged columns wrapped with three layers of BFRP sheets,the axial strengths of these columns after exposuring to 200℃,400℃,600℃ and 800℃ are increased by 48%,130%,206% and 389%,respectively;and the corresponding axial deformation increases are 433%,344%,319% and 251%,respectively.The typical ultimate stress and ultimate strain models for fiber-reinforced polymer(FRP)-confined undamaged concrete are not suitable for FRP-confined heat-damaged concrete.Through establishing the hydrostatic pressure balance equation of the cylindrical FRP membrane as well as proposing the volumetric strain energy models of confined concrete and BFRP sheets,the basic formulas defined for the axial ultimate stress and axial ultimate strain of FRP confined fire-damaged concrete columns are modified.The temperature-dependent variables in the proposed formulas were determinedbased on the presented experimental results,and therefore,design-oriented models were established for axial ultimate stress and axial ultimate strain of FRP-confined heat-damaged square concrete columns.
引文
[1]李国强,吴波,韩林海.结构抗火研究进展与趋势[J].建筑钢结构进展,2006,8(1):1-13.LI Guoqiang,WU Bo,HAN Linhai.Development of the research on fire-resistance of structures[J].Progress in Steel Building Structures,2006,8(1):1-13(in Chinese).
[2]王铮.混凝土高温后力学性能的试验研究[D].大连:大连理工大学,2010.WANG Zheng.Experimental study on mechanical properties of concrete after high temperature[D].Dalian:Dalian University of Technology,2010(in Chinese).
[3]过镇海.常温和高温下混凝土材料和构件的力学性能[M].北京:清华大学出版社,2005:305-318.GUO Zhenhai.Mechanical properties of concrete materials and members at normal and elevated temperatures[M].Beijing:Press of Tsinghua University,2005:305-318(in Chinese).
[4] GAN W Y,DAI J G,TENG J G.Simple method for predicting temperatures in reinforced concrete beams exposed to a standard fire[J].Advances in Structural Engineering,2014,17(4):573-589.
[5] JIANG T,TENG J G.Behavior and design of slender FRPconfined circular RC columns[J].Journal of Composites for Construction,2013,17(4):443-453.
[6]欧阳利军.玄武岩纤维与碳纤维加固混凝土构件试验与理论研究[D].上海:同济大学,2011.OUYANG Lijun.Experimental and theoretical study of basalt fiber and carbon fiber reinforced concrete members[D].Shanghai:Tongji University,2011(in Chinese).
[7]欧阳利军,丁斌,陆洲导,等.玄武岩纤维与碳纤维加固短柱抗震试验研究[J].同济大学学报(自然科学版),2013,41(2):166-172.OUYANG Lijun,DING Bin,LU Zhoudao,et al.Experimental study on seismic performance of short columns strengthened with BFRP and CFRP[J].Journal of Tongji University(Natural Science),2013,41(2):166-172(in Chinese).
[8] DAI J G,BAI Y L,TENG J G.Behavior and modeling of concrete confined with FRP composites of large deformability[J].Journal of Composites for Construction,2011,15(6):963-973.
[9] TOUTANJI H,HAN M,GILBERT J,et al.Behavior of large-scale rectangular columns confined with FRP composites[J].Journal of Composites for Construction,2010,14(1):62-71.
[10]中华人民共和国住房和城乡建设部.纤维增强复合材料建设工程应用技术规范:GB50608—2010[S].北京:中国计划出版社,2010.Ministry of Housing and Urban-Rural Development of the People’s Republic of China.Technical code for infrastructure application of FRP composites:GB50608—2010[S].Beijing:China Planning Press,2010(in Chinese).
[11] America Concrete Institute.Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures:ACI 440.2R[S].Farmington Hills:ACI,2008.
[12] YAQUB M,BAILEY C G.Repair of fire damaged circular reinforced concrete columns with FRP composites[J].Construction and Building Materials,2011,25(1):359-370.
[13] YAQUB M,BAILEY C G.Cross sectional shape effects on the performance of post-heated reinforced concrete columns wrapped with FRP composites[J].Composite Structures,2011,93(3):1103-1117.
[14] LENWARI A,RUNGAMORNRAT J, WOONPRASERT S.Axial compression behavior of fire-damaged concrete cylinders confined with CFRP sheets[J].Journal of Composites for Construction,2016,20(5):04016027.
[15] BISBY L A,CHEN J F,LI S Q,et al.Strengthening firedamaged concrete by confinement with fiber-reinforced polymer wraps[J].Engineering Structures,2011,33(12):3381-3391.
[16] YAQUB M,BAILEY C G,NEDWELL P.Axial capacity of post-heated square columns wrapped with FRP composites[J].Cement and Concrete Composites,2011,33(6):694-701.
[17]欧阳利军,许峰,陆洲导.玄武岩纤维布约束高温损伤混凝土轴压力学性能[J].复合材料学报,2018,35(8):2002-2013.OUYANG Lijun,XU Feng,LU Zhoudao.Axial compressive behavior of BFRP-confined damaged concrete after exposed to elevated temperatures[J].Acta Materiae Compositae Sinica,22018,35(8):2002-2013(in Chinese).
[18] PHAM T M,HADI M N S.Stress prediction model for FRP confined rectangular concrete columns with rounded corners[J].Journal of Composites for Construction,2014,18(1):04013019.
[19] ZENG J J,GUO Y C,GAO W Y,et al.Behavior of partially and fully FRP-confined circularized square columns under axial compression[J].Construction and Building Materials,2017,152:319-332.
[20]中华人民共和国住房和城乡建设部.混凝土结构加固设计规范:GB50367—2013[S].北京:中国建筑工业出版社,2013.Ministry of Housing and Urban-Rural Development of the People’s Republic of China.Design code for strengthening concrete structure:GB50367—2013[S].Beijing:China Architecture and Building Press,2013(in Chinese).
[21] LAM L,TENG J G.Ultimate condition of fiber reinforced polymer-confined concrete[J].Journal of Composites for Construction,2004,8(6):539-548.
[22] JIAN C L,OZBAKKALOGLU T.Hoop strains in FRP-confined concrete columns:Experimental observations[J].Materials and Structures,2015,48(9):2839-2854.
[23] HADI M N S,PHAM T M,LEI X.New Method of strengthening reinforced concrete square columns by circularizing and wrapping with fiber-reinforced polymer or steel straps[J].Journal of Composites for Construction,2013,17(2):229-238.
[24] WANG L M,WU Y F.Effect of corner radius on the performance of CFRP-confined square concrete columns:Test[J].Engineering Structures,2008,30(2):493-505.
[25] WANG Z,WANG D,SMITH S T,et al.CFRP-confined square RC columns.I:Experimental investigation[J].Journal of Composites for Construction,2012,16(2):150-160.
[26] WANG Z,WANG D,SMITH S T,et al.CFRP-confined square RC columns:II—Cyclic axial compression stressstrain model[J].Journal of Composites for Construction,2012,16(2):161-170.
[27] LAM L,TENG J G.Design-oriented stress-strain model for FRP-confined concrete in rectangular columns[J].Journal of Reinforced Plastics and Composites, 2003, 22(13):1149-1186.
[28] CSUKA B,KOLLAR L P.Analysis of FRP confined columns under eccentric loading[J]. Composite Structures,2012,94(3):1106-1116.
[29] CALLADINE C R.Theory of shell structures[M].1st ed.Cambridge:Cambridge University Press,1983:80-118.
[30]刘鸿文.材料力学[M].5版.北京:高等教育出版社,2011:14-16.LIU Hongwen.Mechanics of materials[M].5th ed.Beijing:Higher Education Press,2011:14-16(in Chinese).
[31] PHAM T M,HADI M N S.Strain estimation of CFRP confined concrete columns using energy approach[J].Journal of Composites for Construction,2013,17(6):04013001.
[32] OZBAKKALOGLU T,JIAN C L,VINCENT T.FRP-confined concrete in circular sections:Review and assessment of stress-strain models[J].Engineering Structures,2013,49(2):1068-1088.
[33] ILKI A,PEKER O,KARAMUK E,et al.FRP retrofit of low and medium strength circular and rectangular reinforced concrete columns[J].Journal of Materials in Civil Engineering,2008,20(2):169-188.
[2]王铮.混凝土高温后力学性能的试验研究[D].大连:大连理工大学,2010.WANG Zheng.Experimental study on mechanical properties of concrete after high temperature[D].Dalian:Dalian University of Technology,2010(in Chinese).
[3]过镇海.常温和高温下混凝土材料和构件的力学性能[M].北京:清华大学出版社,2005:305-318.GUO Zhenhai.Mechanical properties of concrete materials and members at normal and elevated temperatures[M].Beijing:Press of Tsinghua University,2005:305-318(in Chinese).
[4] GAN W Y,DAI J G,TENG J G.Simple method for predicting temperatures in reinforced concrete beams exposed to a standard fire[J].Advances in Structural Engineering,2014,17(4):573-589.
[5] JIANG T,TENG J G.Behavior and design of slender FRPconfined circular RC columns[J].Journal of Composites for Construction,2013,17(4):443-453.
[6]欧阳利军.玄武岩纤维与碳纤维加固混凝土构件试验与理论研究[D].上海:同济大学,2011.OUYANG Lijun.Experimental and theoretical study of basalt fiber and carbon fiber reinforced concrete members[D].Shanghai:Tongji University,2011(in Chinese).
[7]欧阳利军,丁斌,陆洲导,等.玄武岩纤维与碳纤维加固短柱抗震试验研究[J].同济大学学报(自然科学版),2013,41(2):166-172.OUYANG Lijun,DING Bin,LU Zhoudao,et al.Experimental study on seismic performance of short columns strengthened with BFRP and CFRP[J].Journal of Tongji University(Natural Science),2013,41(2):166-172(in Chinese).
[8] DAI J G,BAI Y L,TENG J G.Behavior and modeling of concrete confined with FRP composites of large deformability[J].Journal of Composites for Construction,2011,15(6):963-973.
[9] TOUTANJI H,HAN M,GILBERT J,et al.Behavior of large-scale rectangular columns confined with FRP composites[J].Journal of Composites for Construction,2010,14(1):62-71.
[10]中华人民共和国住房和城乡建设部.纤维增强复合材料建设工程应用技术规范:GB50608—2010[S].北京:中国计划出版社,2010.Ministry of Housing and Urban-Rural Development of the People’s Republic of China.Technical code for infrastructure application of FRP composites:GB50608—2010[S].Beijing:China Planning Press,2010(in Chinese).
[11] America Concrete Institute.Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures:ACI 440.2R[S].Farmington Hills:ACI,2008.
[12] YAQUB M,BAILEY C G.Repair of fire damaged circular reinforced concrete columns with FRP composites[J].Construction and Building Materials,2011,25(1):359-370.
[13] YAQUB M,BAILEY C G.Cross sectional shape effects on the performance of post-heated reinforced concrete columns wrapped with FRP composites[J].Composite Structures,2011,93(3):1103-1117.
[14] LENWARI A,RUNGAMORNRAT J, WOONPRASERT S.Axial compression behavior of fire-damaged concrete cylinders confined with CFRP sheets[J].Journal of Composites for Construction,2016,20(5):04016027.
[15] BISBY L A,CHEN J F,LI S Q,et al.Strengthening firedamaged concrete by confinement with fiber-reinforced polymer wraps[J].Engineering Structures,2011,33(12):3381-3391.
[16] YAQUB M,BAILEY C G,NEDWELL P.Axial capacity of post-heated square columns wrapped with FRP composites[J].Cement and Concrete Composites,2011,33(6):694-701.
[17]欧阳利军,许峰,陆洲导.玄武岩纤维布约束高温损伤混凝土轴压力学性能[J].复合材料学报,2018,35(8):2002-2013.OUYANG Lijun,XU Feng,LU Zhoudao.Axial compressive behavior of BFRP-confined damaged concrete after exposed to elevated temperatures[J].Acta Materiae Compositae Sinica,22018,35(8):2002-2013(in Chinese).
[18] PHAM T M,HADI M N S.Stress prediction model for FRP confined rectangular concrete columns with rounded corners[J].Journal of Composites for Construction,2014,18(1):04013019.
[19] ZENG J J,GUO Y C,GAO W Y,et al.Behavior of partially and fully FRP-confined circularized square columns under axial compression[J].Construction and Building Materials,2017,152:319-332.
[20]中华人民共和国住房和城乡建设部.混凝土结构加固设计规范:GB50367—2013[S].北京:中国建筑工业出版社,2013.Ministry of Housing and Urban-Rural Development of the People’s Republic of China.Design code for strengthening concrete structure:GB50367—2013[S].Beijing:China Architecture and Building Press,2013(in Chinese).
[21] LAM L,TENG J G.Ultimate condition of fiber reinforced polymer-confined concrete[J].Journal of Composites for Construction,2004,8(6):539-548.
[22] JIAN C L,OZBAKKALOGLU T.Hoop strains in FRP-confined concrete columns:Experimental observations[J].Materials and Structures,2015,48(9):2839-2854.
[23] HADI M N S,PHAM T M,LEI X.New Method of strengthening reinforced concrete square columns by circularizing and wrapping with fiber-reinforced polymer or steel straps[J].Journal of Composites for Construction,2013,17(2):229-238.
[24] WANG L M,WU Y F.Effect of corner radius on the performance of CFRP-confined square concrete columns:Test[J].Engineering Structures,2008,30(2):493-505.
[25] WANG Z,WANG D,SMITH S T,et al.CFRP-confined square RC columns.I:Experimental investigation[J].Journal of Composites for Construction,2012,16(2):150-160.
[26] WANG Z,WANG D,SMITH S T,et al.CFRP-confined square RC columns:II—Cyclic axial compression stressstrain model[J].Journal of Composites for Construction,2012,16(2):161-170.
[27] LAM L,TENG J G.Design-oriented stress-strain model for FRP-confined concrete in rectangular columns[J].Journal of Reinforced Plastics and Composites, 2003, 22(13):1149-1186.
[28] CSUKA B,KOLLAR L P.Analysis of FRP confined columns under eccentric loading[J]. Composite Structures,2012,94(3):1106-1116.
[29] CALLADINE C R.Theory of shell structures[M].1st ed.Cambridge:Cambridge University Press,1983:80-118.
[30]刘鸿文.材料力学[M].5版.北京:高等教育出版社,2011:14-16.LIU Hongwen.Mechanics of materials[M].5th ed.Beijing:Higher Education Press,2011:14-16(in Chinese).
[31] PHAM T M,HADI M N S.Strain estimation of CFRP confined concrete columns using energy approach[J].Journal of Composites for Construction,2013,17(6):04013001.
[32] OZBAKKALOGLU T,JIAN C L,VINCENT T.FRP-confined concrete in circular sections:Review and assessment of stress-strain models[J].Engineering Structures,2013,49(2):1068-1088.
[33] ILKI A,PEKER O,KARAMUK E,et al.FRP retrofit of low and medium strength circular and rectangular reinforced concrete columns[J].Journal of Materials in Civil Engineering,2008,20(2):169-188.