基于强度退化的震损加固型钢混凝土柱抗剪承载力分析
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摘要
为了建立碳纤维布或外包钢套震损加固型钢混凝土柱的抗剪承载力计算式,基于碳纤维布或外包钢套加固型钢混凝土柱试验研究,分析了原柱材料的地震损伤以及混凝土受剪机理的差异,比较了不同抗剪模型建立的抗剪承载力计算值的差异性。经验证,计算值与其试验值吻合较好,说明基于强度退化的震损加固型钢混凝土柱抗剪承载力计算公式是可行的。基于GB50010-2010、ACI318-08和CSA-04三种不同抗剪模型建立的抗剪承载力计算值差异较大,说明震损加固柱中钢筋混凝土承担剪力的分析不容忽视。
In order to establish a formula for calculating the shear capacity of the seismic-damaged steel reinforced concrete(SRC)columns strengthened with CFRP or enveloped steel jacket,the earthquake damage of the original column material and the difference in shear mechanism of the concrete were analyzed based on laboratory experiments.Shear bearing capacities calculated from different shear models were compared.The comparison showed that the calculated results agreed well with the experimental results,indicating that the calculation formula of shear bearing capacity of SRC columns based on strength degradation was feasible.Based on GB 50010—2010,ACI318-08,and CSA-04,three different shear models were established,and the calculated values of shear capacity were quite different.This indicated that the analysis of the shear strength of RC in the strengthened seismic-damaged SRC column cannot be ignored.
In order to establish a formula for calculating the shear capacity of the seismic-damaged steel reinforced concrete(SRC)columns strengthened with CFRP or enveloped steel jacket,the earthquake damage of the original column material and the difference in shear mechanism of the concrete were analyzed based on laboratory experiments.Shear bearing capacities calculated from different shear models were compared.The comparison showed that the calculated results agreed well with the experimental results,indicating that the calculation formula of shear bearing capacity of SRC columns based on strength degradation was feasible.Based on GB 50010—2010,ACI318-08,and CSA-04,three different shear models were established,and the calculated values of shear capacity were quite different.This indicated that the analysis of the shear strength of RC in the strengthened seismic-damaged SRC column cannot be ignored.
引文
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[20]卢亦焱,刘兰,张华,等.外包角钢与碳纤维布复合加固钢筋混凝土柱抗剪承载力计算方法[J].工程力学,2008,25(5):157-162.Lu Y Y,Liu L,Zhang H,et al.Calculation method of sheer capacity of RC column combination strengthened with angle steel and CFRP[J].Engineering Mechanics,2008,25(5):157-162.(in Chinese)
[21]叶列平,赵树红,李全旺,等.碳纤维布加固混凝土柱的斜截面受剪承载力计算[J].建筑结构学报,2000,21(2):59-67.Ye L P,Zhao Sh H,Li Q W,et al.Calculation of shear strength of concrete column strengthened with carbon fiber reinforced plastic sheet[J].Journal of Building Structures,2000,21(2):59-67.(in Chinese)
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[23]张云峰.碳纤维布加固震损钢筋混凝土柱抗震性能研究[D].包头:内蒙古科技大学,2012.Zhang Y F.Experimental research on the seismic performances of damaged reinforced concrete columns strengthened with carbon fiber reinforced plastics[D].Baotou:Inner Mongolia University of Science and Technology,2012.
[2]Samuel A B.Review of strengthening techniques for masonry using fiber reinforced polymers[J].Composite Structures,2017,161:246-255.
[3]郑山锁,侯丕吉,张宏仁,等.SRHSHPC框架结构地震损伤试验研究[J].工程力学,2012,29(7):84-92.Zheng Sh S,Hou P J,Zhang H R,et al.Experimental study on seismic damage of SRHSHPC frame structure[J].Engineering Mechanics,2012,29(7):84-92.(in Chinese)
[4]Pan Z F,Li B.Truss-arch model for shear strength of shear-critica reinforced concrete columns[J].Journal of Structural Engineering,2013,139(4):548-560.
[5]董宇光,吕西林,丁子文.型钢混凝土剪力墙抗剪承载力计算公式研究[J].工程力学,2007,24(增1):114-118.Dong Y G,Lyu X L,Ding Z W.Calculation method for shear resistant capacity of steel reinforced concrete walls[J].Engineering Mechanics,2007,24(Sup 1):114-118.(in Chinese)
[6]许成祥,万冲,潘航,等.震损型钢混凝土框架柱外包钢加固试验研究[J].四川建筑科学研究,2017,43(2):42-47.Xu Ch X,Wan Ch,Pan H,et al.Experimental study on steel reinforced concrete frame columns strengthened with steel angles and strips damaged by simulated earthquake[J].Sichuan Building Science,2017,43(2):42-47.(in Chinese)
[7]Peng Sh,Xu Ch X,Lu M X,et al.Experimental research and finite element analysis on seismic behavior of CFRP-strengthened seismic-damaged composite steel-concrete frame columns[J].Engineering Structures,2018,(155):50-60.
[8]许成祥,卢梦潇,杨炳,等.碳纤维布加固震损型钢混凝土柱抗震性能试验研究[J].土木工程学报,2016,49(增2):51-56.Xu Ch X,Lu M X,Yang B,et al.Experimental research on seismic behavior of CFRP-strengthened seismicdamaged SRC columns[J].China Civil Engineering Journal,2016,49(Sup 2):51-56.(in Chinese)
[9]孙艳,杨建明,许成祥,等.碳纤维布加固震损SRC柱抗震性能有限元分析[J].广西大学学报(自然科学版),2017,42(1):18-27.Sun Y,Yang J M,Xu Ch X,et al.Finite element analysis of CFRP strengthened seismic-damaged SRC columns[J].Journal of Guangxi University(Natural Science Edition),2017,42(1):18-27.(in Chinese)
[10]刘杰东.震损钢筋混凝土框架滞回模型研究[D].重庆:重庆大学,2015.Liu J D.Research on modeling of hysteretic characteristics of RC frames damaged during earthquake[D].Chongqing:University of Chongqing,2015.(in Chinese)
[11]郑山锁,王唯,李龙,等.基于纤维模型的型钢混凝土柱精细化建模分析[J].广西大学学报(自然科学版),2012,37(2):197-203.Zheng Sh S,Wang W,Li L,et al.Accurate modeling of SRC columns based on OpenSEES[J].Journal of Guangxi University(Natural Science Edition),2012,37(2):197-203.(in Chinese)
[12]赵树红,叶列平.基于桁架-拱模型理论对碳纤维布加固混凝土柱受剪承载力的分析[J].工程力学,2001,18(6):135-140.Zhao Sh H,Ye L P.Shear strength analysis of concrete column retrofitted with CFRP sheet based on strutarch model[J].Engineering Mechanic,2001,18(6):135-140.(in Chinese)
[13]混凝土结构加固技术规程:GB50367-2006[S].北京:中国建筑工业出版社,2006.Design code for strengthening concrete structure:GB50367-2006[S].Beijing:China Architecture&Building Press.(in Chinese)
[14]碳纤维片材加固修复混凝土结构技术规程:CECS146-2003[S].北京:中国计划出版社,2006.Technical specification for strengthening concrete structures with carbon fiber reinforced polymer laninate:CECS146-2003[S].Beijing:China Planning Press,2003.(in Chinese)
[15]混凝土结构设计规范:GB50010-2010[S].北京:中国建筑工业出版社,2010.Code for design of concrete structures:GB50010-2010[S].Beijing:China Architecture&Building Press,2010.(in Chinese)
[16]魏建萍,张兴虎.基于桁架-拱模型理论对实腹式型钢混凝土短柱受剪承载力的分析[J].建筑钢结构进展,2011,13(4):52-56.Wei J P,Zhang X H.Analysis on the shear bearing capacity of solid-webbed steel reinforced concrete short column based on tnassed arch model[J].Progress in Steel Building Structures,2011,13(4):52-56.(in Chinese)
[17]组合结构设计规范:JGJ138-2016[S].北京:中国建筑工业出版社,2006.Code for design of composite structures:JGJ138-2016[S].Beijing:China Architecture&Building Press.(in Chinese)
[18]ACI Committee 318.Building code requirements for structural concrete and Commentary:ACI318R-08[S].Farmington(MI):American Concrete Institute,2008.
[19]CSA Committee A23.3.Design of concrete structures:CSA A23.3-04[S].Mississauga:Canadian Standards Association,2004.
[20]卢亦焱,刘兰,张华,等.外包角钢与碳纤维布复合加固钢筋混凝土柱抗剪承载力计算方法[J].工程力学,2008,25(5):157-162.Lu Y Y,Liu L,Zhang H,et al.Calculation method of sheer capacity of RC column combination strengthened with angle steel and CFRP[J].Engineering Mechanics,2008,25(5):157-162.(in Chinese)
[21]叶列平,赵树红,李全旺,等.碳纤维布加固混凝土柱的斜截面受剪承载力计算[J].建筑结构学报,2000,21(2):59-67.Ye L P,Zhao Sh H,Li Q W,et al.Calculation of shear strength of concrete column strengthened with carbon fiber reinforced plastic sheet[J].Journal of Building Structures,2000,21(2):59-67.(in Chinese)
[22]Jin Ch H,Pan Z F,Meng Sh P,et al.Seismic behavior of shear-critical reinforced high-strength concrete columns[J].Journal of Structural Engineering,2015,141(8):04014198.
[23]张云峰.碳纤维布加固震损钢筋混凝土柱抗震性能研究[D].包头:内蒙古科技大学,2012.Zhang Y F.Experimental research on the seismic performances of damaged reinforced concrete columns strengthened with carbon fiber reinforced plastics[D].Baotou:Inner Mongolia University of Science and Technology,2012.