钢管混凝土组合柱在标准火与真实火中的行为比较
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摘要
以实际工程中常用的钢管混凝土组合柱为研究对象,通过ABAQU S大型有限元软件模拟钢管混凝土组合柱在标准火和真实火中的截面温度分布、应力、变形、破坏形态、耐火极限等力学行为。其中标准火选用ISO-834标准火模型,真实火采用欧洲规范Eurocode 1 Part 1-2中的参数火模型来近似模拟真实火灾的温度—时间关系。研究发现,钢管混凝土柱在两种火场环境中的行为差异很大,真实火中的冷却过程对钢管混凝土的破坏起重要的影响。基于本研究,还初步得到火灾过程中环境温度的升温速度、柱火灾荷载比等对钢管混凝土组合柱的抗火性能的影响。
Concrete filled steel tubular(CFST) column,which has been widely used in real projects,was chosen as the research objects in this paper.A large-scale finite element analysis model of CFST using ABAQUS program was established to analyze the temperature distributions,stress,deformations,failure modes,fire resistance limit of CFST column in the ISO-834 standard fire and natural fire.Parametric temperature-time curves in Eurocode 1 Part 1-2 were used to approximate the temperature versus time relations in natural fire.The research shows that CFST columns behaves differently in natural fire from the standard fire.Based on the current analysis,the effects of the fire heating rate,load ratio,etc.on the fire resistance of CFST columns are also summarized.
Concrete filled steel tubular(CFST) column,which has been widely used in real projects,was chosen as the research objects in this paper.A large-scale finite element analysis model of CFST using ABAQUS program was established to analyze the temperature distributions,stress,deformations,failure modes,fire resistance limit of CFST column in the ISO-834 standard fire and natural fire.Parametric temperature-time curves in Eurocode 1 Part 1-2 were used to approximate the temperature versus time relations in natural fire.The research shows that CFST columns behaves differently in natural fire from the standard fire.Based on the current analysis,the effects of the fire heating rate,load ratio,etc.on the fire resistance of CFST columns are also summarized.
引文
[1]韩林海,杨华,霍静思,等.标准火灾作用后矩形钢管混凝土柱剩余承载力的研究[J].工程力学,2002,19(5):78-86.Han L H,Yang H,Huo J S,et al.Residual strengthof concrete filled steel tubular columns with rectangu-lar sections after exposure to standard fire[J].Engi-neering Mechanics,2002,19(5):78-86.
[2]林晓康,韩林海.ISO-834标准火灾作用后方钢管混凝土构件滞回性能试验研究[J].地震工程与工程振动,2003,23(4):188-194.Lin X K,Han L H.Cyclic behavior of concrete-filledSHS(square hollow section)columns after exposureto ISO-834 standard fire[J].Earthquake Engineeringand Engineering Vibration,2003,23(4):188-194.
[3]霍静思,韩林海.ISO-834标准火灾作用后钢管混凝土轴压刚度和抗弯刚度的研究[J].工业建筑,2004,34(1):21-25,28.Huo J S,Han L H.Research on the axial and flexuralrigidity of concrete-filled steel tubes after exposure toISO-834 standard fire[J].Industrial Construction,2004,34(1):21-25,28.
[4]International Standard ISO834 Fire-resistance TestsElements of Building Construction,Amendment 1,A-mendment 2[S],1980.
[5]Lie T T.Fire resistance of circular steel columnsfilled with bar-reinforced concrete[J].Journal ofStructural Engineering,1994,120(5):1489-1509.
[6]韩林海,徐蕾,经建生,等.钢管混凝土柱的防火保护层厚度[J].消防科学与技术,2001,(6):1-4.Han L H,Xu L,Jing J Sh,et al.Fire protection ma-terials thickness of concrete filled steel tubular column[J].Fire Science and Technology,2001,(6):1-4.
[7]杨有福,冯九斌,徐蕾,等.钢管混凝土柱防火保护层厚度实用计算方法研究[J].钢结构,2001,16(6):39-42.Yang Y F,Feng J B,Xu L,et al.Method of calcu-lating fire spray materials thickness of concrete filledsteel pipe columns[J].Steel Construction,2001,16(6):39-42.
[8]杨有福,韩林海.钢管混凝土柱防火保护层计算方法研究[J].工业建筑,2004,34(1):14-17.Yang Y F,Han L H.Research on calculating methodfor fire protection of concrete-filled steel tubularcolumns[J].Industrial Construction,2004,34(1):14-17.
[9]宋天诣.火灾后钢-混凝土组合框架梁-柱节点的力学性能研究[D].北京:清华大学,2010.Song T Y.Research on post-fire performance of steel-concrete composite beam-column joints[D].Beijing:Tsinghua University,2010.
[10]韩林海.钢管混凝土结构—理论与实践(第二版)[M].北京:科学出版社,2007.Han L H.Concrete Filled Steel Tubular Structure-Theory and Practice[M].Beijing:Science Press,2007.
[11]Yang H,Han L H,Wang Y C.Effects of heating andloading histories on post-fire cooling behavior of con-crete-filled steel tubular columns[J].Journal of Con-structional Steel Research,2008,64(5):556-570.
[12]European Committee for Standardization.Eurocode1.EN 1991-1-2:2002.Actions on Structures-Part1-2:General Actions-Actions on Structures Exposed toFire[S].Brussels,2002.
[2]林晓康,韩林海.ISO-834标准火灾作用后方钢管混凝土构件滞回性能试验研究[J].地震工程与工程振动,2003,23(4):188-194.Lin X K,Han L H.Cyclic behavior of concrete-filledSHS(square hollow section)columns after exposureto ISO-834 standard fire[J].Earthquake Engineeringand Engineering Vibration,2003,23(4):188-194.
[3]霍静思,韩林海.ISO-834标准火灾作用后钢管混凝土轴压刚度和抗弯刚度的研究[J].工业建筑,2004,34(1):21-25,28.Huo J S,Han L H.Research on the axial and flexuralrigidity of concrete-filled steel tubes after exposure toISO-834 standard fire[J].Industrial Construction,2004,34(1):21-25,28.
[4]International Standard ISO834 Fire-resistance TestsElements of Building Construction,Amendment 1,A-mendment 2[S],1980.
[5]Lie T T.Fire resistance of circular steel columnsfilled with bar-reinforced concrete[J].Journal ofStructural Engineering,1994,120(5):1489-1509.
[6]韩林海,徐蕾,经建生,等.钢管混凝土柱的防火保护层厚度[J].消防科学与技术,2001,(6):1-4.Han L H,Xu L,Jing J Sh,et al.Fire protection ma-terials thickness of concrete filled steel tubular column[J].Fire Science and Technology,2001,(6):1-4.
[7]杨有福,冯九斌,徐蕾,等.钢管混凝土柱防火保护层厚度实用计算方法研究[J].钢结构,2001,16(6):39-42.Yang Y F,Feng J B,Xu L,et al.Method of calcu-lating fire spray materials thickness of concrete filledsteel pipe columns[J].Steel Construction,2001,16(6):39-42.
[8]杨有福,韩林海.钢管混凝土柱防火保护层计算方法研究[J].工业建筑,2004,34(1):14-17.Yang Y F,Han L H.Research on calculating methodfor fire protection of concrete-filled steel tubularcolumns[J].Industrial Construction,2004,34(1):14-17.
[9]宋天诣.火灾后钢-混凝土组合框架梁-柱节点的力学性能研究[D].北京:清华大学,2010.Song T Y.Research on post-fire performance of steel-concrete composite beam-column joints[D].Beijing:Tsinghua University,2010.
[10]韩林海.钢管混凝土结构—理论与实践(第二版)[M].北京:科学出版社,2007.Han L H.Concrete Filled Steel Tubular Structure-Theory and Practice[M].Beijing:Science Press,2007.
[11]Yang H,Han L H,Wang Y C.Effects of heating andloading histories on post-fire cooling behavior of con-crete-filled steel tubular columns[J].Journal of Con-structional Steel Research,2008,64(5):556-570.
[12]European Committee for Standardization.Eurocode1.EN 1991-1-2:2002.Actions on Structures-Part1-2:General Actions-Actions on Structures Exposed toFire[S].Brussels,2002.
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