高温中荷载对高温后钢筋混凝土梁受剪承载力的影响
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摘要
设置高温中和高温后不同的钢筋笼,用以区分高温中和高温后模型的异同,利用ABAQUS损伤塑性模型考虑混凝土损伤的积累,建立模拟高温中荷载对高温后钢筋混凝土梁受剪承载力影响的三维有限元分析模型。通过与试验结果的对比,验证了该模型具有较好的精度。采用该模型分析高温中不同荷载水平及作用位置对高温后钢筋混凝土梁受剪承载力的影响,结果表明:随着高温中荷载的增加,高温后钢筋混凝土梁受剪承载力降低;当高温中荷载小于其极限荷载的0.6倍时,受剪承载力降低较小,当高温中荷载大于其极限荷载0.6倍时,降低明显;对于高温中和高温后作用点相同的情况,剪跨比越小,受剪承载力下降越大;随着高温中荷载的增加,残余应变增大,但高温后刚度变化较小。
Based on ABAQUS concrete damaged plasticity material model,a 3D finite element model was built for simulating the effect of loads during high temperature on the shear strength of RC beams after fire.Two reinforcement cages were set,one for during high temperature and the other for after.The model was validated by comparing the simulation results with the real fire tests.By means of this model,the factors,load magnitude and location during high temperature,were studied for their influences on the shear strength of RC beams after fire.The results show that as the increasing of loads during high temperature,the shear bearing capacity decreases.While the load is less than 60 percent of the ultimate bearing capacity,the shear bearing capacity decreases slowly,and it decreases rapidly when the load is more than 60%.The results also show while the load location is the same during and after fire,the smaller the shear span ratio is,the more the shear bearing capacity decreases;as the increasing of load during high temperature,the residual strain grows but the stiffness changes little.
Based on ABAQUS concrete damaged plasticity material model,a 3D finite element model was built for simulating the effect of loads during high temperature on the shear strength of RC beams after fire.Two reinforcement cages were set,one for during high temperature and the other for after.The model was validated by comparing the simulation results with the real fire tests.By means of this model,the factors,load magnitude and location during high temperature,were studied for their influences on the shear strength of RC beams after fire.The results show that as the increasing of loads during high temperature,the shear bearing capacity decreases.While the load is less than 60 percent of the ultimate bearing capacity,the shear bearing capacity decreases slowly,and it decreases rapidly when the load is more than 60%.The results also show while the load location is the same during and after fire,the smaller the shear span ratio is,the more the shear bearing capacity decreases;as the increasing of load during high temperature,the residual strain grows but the stiffness changes little.
引文
[1]张家广,霍静思,肖岩.高温作用后钢筋混凝土短柱轴压力学性能试验研究[J].建筑结构学报,2011,32(4):117-124.(ZHANG Jiaguang,HUO Jingsi,XIAOYan.Experimental study on axial mechanical behaviorof reinforced concrete stub columns with pre-load afterexposure to high temperatures[J].Journal of BuildingStructures,2011,32(4):117-124.(in Chinese))
[2]Huo Jingsi,Huang Guowang,Xiao Yan,et al.Effectsof sustained pre-load on residual strength and stiffnessof concrete-filled steel tube after exposure to hightemperatures[J].Key Engineering Materials,2009,400/401/402:769-774.
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[12]吴波,马忠诚,欧进萍.高温后混凝土在重复荷载作用下的应力-应变关系[J].地震工程与工程振动,1997,17(3):37-43.(Wu Bo,Ma Zhongcheng,OuJinping.Stress-strain relations for concrete under cyclicloading after high temperature up to 800℃[J].Earthquake Engineering and Engineering Vibration,1997,17(3):37-43.(in Chinese))
[13]Chang Y F,Chen Y H,Sheu M S,Yao G C.Residualstress-strain relationship for concrete after exposure tohigh temperatures[J].Cement and Concrete Research,2006,36(10):1999-2005.
[14]Nielsen C V,Birani N.Residual fracture energy ofhigh-performance and normal concrete subject to hightemperatures[J].Materials and Structures,2003,36(8):515-521.
[15]Krtzig W B,Plling R.An elasto-plastic damagemodel for reinforced concrete with minimum number ofmaterial parameters[J].Computer and Structures,2004,82(15):1201-1215.
[16]Kordina K,Ehm C,Schneider U.Effect of biaxialloading on the high temperature behaviour of concrete[C]//Proceedings of the First Symposium on FireSafety Science.Washington DC,USA:GaithersburgHemisphere Publish Corporation,1986:281-290.
[17]EN 1992-1-2 Eurocode 2:design of concretestructure:part 1-2:general rules:structural fire design[S].Brussels:European Committee forStandardization,2004.
[18]吴波,梁悦欢.高温后混凝土和钢筋强度的统计分析[J].华南理工大学学报:自然科学版,2008,36(12):13-20.(Wu Bo,Liang Yuehuan.Statiscalanalysis of strengths of concrete and steel bar after high-temperature treatment[J].Journal of South ChinaUniversity of Technology:Natural Science Edition,2008,36(12):13-20.(in Chinese))
[19]日本建筑省.建筑物综合防火设计[M].孙金香,高伟,译.天津:天津科技翻译出版公司,1994:780.(Japan Construction Ministry.Building fire safetydesign[M].Translated by SUN Jin-xiang,GAO Wei.Tianjin:Tianjin Science and Technology Translationand Publishing Corporation,1994:780.(inChinese))
[20]陆洲导.钢筋混凝土梁对火灾反应研究[D].上海:同济大学,1989:19.(Lu Zhoudao.Fire responseanalysis of reinforced concrete beams[D].Shanghai:Tongji University,1989:19.(in Chinese))
[21]刘文燕,黄鼎业,华毅杰.混凝土表面对流换热系数测试方法探讨[J].四川建筑科学研究,2004,30(4):87-89.(Liu Wenyan,Huang Dingye,Hua Yijie.Probe into test method of heat convection coefficient ofconcrete[J].Sichuan Building Science,2004,30(4):87-89.(in Chinese))
[22]张建荣,刘照球.混凝土对流换热系数的风洞实验研究[J].土木工程学报,2006,39(9):39-42,61.(Zhang Jianrong,Liu Zhaoqiu.A study on theconvective heat transfer coefficient of concrete in windtunnel experiment[J].China Civil EngineeringJournal,2006,39(9):39-42,61.(in Chinese))
[23]EN 1991-1-2 Eurocode 1:actions on structure:part 1-2:general actions:actions on structures exposed to fire[S].Brussels:European Committee forStandardization,2002.
[24]苏磊.受火后混凝土结构抗剪性能试验与理论研究[D].上海:同济大学,2011:106-130.(SU Lei.Experimental and theorotical research on shear behaviorof concrete structure after fire[D].Shanghai:TongjiUniversity,2011:106-130.(in Chinese))
[2]Huo Jingsi,Huang Guowang,Xiao Yan,et al.Effectsof sustained pre-load on residual strength and stiffnessof concrete-filled steel tube after exposure to hightemperatures[J].Key Engineering Materials,2009,400/401/402:769-774.
[3]陈鸣,金贤玉,胡文清.钢筋混凝土梁火烧后残余抗剪强度的研究[J].浙江大学学报:自然科学版,1995,29(1):98-107.(Chen Ming,Jin Xianyu,HuWenqing.Residual shear strength of reinforced concretebeams after firing[J].Journal of Zhejiang University:Natural Science,1995,29(1):98-107.(in Chinese))
[4]肖建庄.高性能混凝土深梁火灾反应及火后抗剪性能[J].结构工程师,2008,24(5):112-118.(XiaoJianzhuang.HPC deep beams:their fire response andshear resistance after fire[J].Structural Engineers,2008,24(5):112-118.(in Chinese))
[5]Hsu J H,Lin C S.Effect of fire on the residualmechanical properties and structural performance ofreinforced concrete beams[J].Journal of FireProtection Engineering,2008,18(4):245-274.
[6]Maruta M,Yamazaki M,Miyashita T.A study on shearbehavior of reinforced concrete beams subjected to long-term heating[J].Nuclear Engineering and Design,1995,156(1/2):29-37.
[7]El-Hawary M M,Ragab A M,El-Azim A A,Elibiari S.Effect of fire on shear behaviour of RC beams[J].Computers&Structures,1997,65(2):281-287.
[8]Khana M S,Prasadb J,Abbasa H.Shear strength ofRC beams subjected to cyclic thermal loading[J].Construction and Building Materials,2010,24(10):1869-1877.
[9]Birtel V,Mark P.Parameterized finite elementmodeling of RC beam shear failure[C]//Proceedingsof the 19th Annual International ABAQUS Users’Conference.Boston,USA:ABAQUS Inc.,2006:95-108.
[10]雷拓,钱江,刘成清.混凝土损伤塑性模型应用研究[J].结构工程师,2008,24(2):22-27.(Lei Tuo,Qian Jiang,Liu Chengqing.Application of damagedplasticity model for concrete[J].Structral Engineers,2008,24(2):22-27.(in Chinese))
[11]吴波,马忠诚,欧进萍.高温后混凝土变形特性及本构关系的试验研究[J].建筑结构学报,1999,20(5):42-49.(WU Bo,MA Zhongcheng,OU Jinping.Experimental research on deformation and constitutiverelationship of concrete under axial loading and hightemperature[J].Journal of Building Structures,1999,20(5):42-49.(in Chinese))
[12]吴波,马忠诚,欧进萍.高温后混凝土在重复荷载作用下的应力-应变关系[J].地震工程与工程振动,1997,17(3):37-43.(Wu Bo,Ma Zhongcheng,OuJinping.Stress-strain relations for concrete under cyclicloading after high temperature up to 800℃[J].Earthquake Engineering and Engineering Vibration,1997,17(3):37-43.(in Chinese))
[13]Chang Y F,Chen Y H,Sheu M S,Yao G C.Residualstress-strain relationship for concrete after exposure tohigh temperatures[J].Cement and Concrete Research,2006,36(10):1999-2005.
[14]Nielsen C V,Birani N.Residual fracture energy ofhigh-performance and normal concrete subject to hightemperatures[J].Materials and Structures,2003,36(8):515-521.
[15]Krtzig W B,Plling R.An elasto-plastic damagemodel for reinforced concrete with minimum number ofmaterial parameters[J].Computer and Structures,2004,82(15):1201-1215.
[16]Kordina K,Ehm C,Schneider U.Effect of biaxialloading on the high temperature behaviour of concrete[C]//Proceedings of the First Symposium on FireSafety Science.Washington DC,USA:GaithersburgHemisphere Publish Corporation,1986:281-290.
[17]EN 1992-1-2 Eurocode 2:design of concretestructure:part 1-2:general rules:structural fire design[S].Brussels:European Committee forStandardization,2004.
[18]吴波,梁悦欢.高温后混凝土和钢筋强度的统计分析[J].华南理工大学学报:自然科学版,2008,36(12):13-20.(Wu Bo,Liang Yuehuan.Statiscalanalysis of strengths of concrete and steel bar after high-temperature treatment[J].Journal of South ChinaUniversity of Technology:Natural Science Edition,2008,36(12):13-20.(in Chinese))
[19]日本建筑省.建筑物综合防火设计[M].孙金香,高伟,译.天津:天津科技翻译出版公司,1994:780.(Japan Construction Ministry.Building fire safetydesign[M].Translated by SUN Jin-xiang,GAO Wei.Tianjin:Tianjin Science and Technology Translationand Publishing Corporation,1994:780.(inChinese))
[20]陆洲导.钢筋混凝土梁对火灾反应研究[D].上海:同济大学,1989:19.(Lu Zhoudao.Fire responseanalysis of reinforced concrete beams[D].Shanghai:Tongji University,1989:19.(in Chinese))
[21]刘文燕,黄鼎业,华毅杰.混凝土表面对流换热系数测试方法探讨[J].四川建筑科学研究,2004,30(4):87-89.(Liu Wenyan,Huang Dingye,Hua Yijie.Probe into test method of heat convection coefficient ofconcrete[J].Sichuan Building Science,2004,30(4):87-89.(in Chinese))
[22]张建荣,刘照球.混凝土对流换热系数的风洞实验研究[J].土木工程学报,2006,39(9):39-42,61.(Zhang Jianrong,Liu Zhaoqiu.A study on theconvective heat transfer coefficient of concrete in windtunnel experiment[J].China Civil EngineeringJournal,2006,39(9):39-42,61.(in Chinese))
[23]EN 1991-1-2 Eurocode 1:actions on structure:part 1-2:general actions:actions on structures exposed to fire[S].Brussels:European Committee forStandardization,2002.
[24]苏磊.受火后混凝土结构抗剪性能试验与理论研究[D].上海:同济大学,2011:106-130.(SU Lei.Experimental and theorotical research on shear behaviorof concrete structure after fire[D].Shanghai:TongjiUniversity,2011:106-130.(in Chinese))
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