火灾后中空夹层高强钢管混凝土柱轴压机理分析
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摘要
为了研究火灾后中空夹层高强钢管混凝土柱(高强CFDST)受压力学性能,选用合理的夹芯混凝土本构关系,利用ABAQUS有限元分析软件建立了计算模型,通过试验对有限元模型进行了验证,验证结果吻合较好。剖析了不同受火时间、空心率、外钢管屈服强度和混凝土抗压强度对火灾后高强CFDST受压力学性能的影响,对其典型曲线进行机理分析,揭示内外钢管与混凝土之间的相互作用力。结果表明:随着受火时间的增加,高强CFDST极限承载力减小;随着外钢管屈服强度由Q345变为Q460,核心混凝土和外钢管承载力占总承载力的比例发生了变化,核心混凝土由60%变为30%,外钢管由25%变为50%;高强外钢管屈服强度的变化对火灾后高强CFDST的极限承载力影响较大。
In order to study the compressive mechanical properties of concrete filled double-skin high-strength steel tubular column( high-strength CFDST) after fire,a reasonable constitutive relation of sandwich concrete was selected in the paper,and a calculation model was established by using ABAQUS finite element analysis software. The influence of fire time,hollow ratio,yield strength of external steel tube and compressive strength of concrete on mechanical properties of high-strength CFDST columns was analyzed. The typical curves of high-strength CFDST composite members were analyzed,and the interaction forces between internal and external steel tubes with concrete were analyzed. The results showed that with the increase of fire time,the ultimate bearing capacity of high-strength CFDST decreased. With the change of yield strength of external steel tube from Q345 to Q460,the ratio of the bearing capacity of core concrete and external steel tube to the total bearing capacity had changed. The proportion of core concrete had changed from 60% to 30%,and the proportion of external steel tube from 25% to 50%,the change of yield strength of external steel tube had a significant effect on the ultimate bearing capacity of high-strength CFDST after fire.
In order to study the compressive mechanical properties of concrete filled double-skin high-strength steel tubular column( high-strength CFDST) after fire,a reasonable constitutive relation of sandwich concrete was selected in the paper,and a calculation model was established by using ABAQUS finite element analysis software. The influence of fire time,hollow ratio,yield strength of external steel tube and compressive strength of concrete on mechanical properties of high-strength CFDST columns was analyzed. The typical curves of high-strength CFDST composite members were analyzed,and the interaction forces between internal and external steel tubes with concrete were analyzed. The results showed that with the increase of fire time,the ultimate bearing capacity of high-strength CFDST decreased. With the change of yield strength of external steel tube from Q345 to Q460,the ratio of the bearing capacity of core concrete and external steel tube to the total bearing capacity had changed. The proportion of core concrete had changed from 60% to 30%,and the proportion of external steel tube from 25% to 50%,the change of yield strength of external steel tube had a significant effect on the ultimate bearing capacity of high-strength CFDST after fire.
引文
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[2]刘晓,鲍俊涛,王兵.火灾后中空夹层钢管混凝土轴压组合柱力学性能有限元研究[J].建筑结构学报,2015,36(增刊1):298-304.
[3]余鑫,陶忠.中空夹层钢管混凝土轴压短柱火灾后剩余承载力的试验研究[J].工业建筑,2009,39(4):9-13.
[4] IMANI R,MOSQUEDA G,BRUNEAU M. Experimental Study on Post-Earthquake Fire Resistance of Ductile Concrete-Filled Double Skin Tube Columns[J].Journal of Structural Engineering,ASCE,2014,92(10):1-10.
[5]尧国皇,韩林海.高强钢管混凝土构件承载力计算方法初探[J].工业建筑,2007,37(2):96-99.
[6]韩林海.钢管混凝土结构:理论与实践[M].2版.北京:科学出版社,2007.
[7]林晓康.火灾后钢管混凝土压弯构件的滞回性能研究[D].福州:福州大学,2006.
[8] TAO Z,WANG X Q,UY B,et al. Stress-Strain Curves of Structural and Reinforcing Steels After Exposure to Elevated Temperatures[J].American Society of Civil Engineers,2013,25:1306-1316.
[9]鲍俊涛.火灾后中空夹层钢管混凝土构件受压力学性能研究[D].沈阳:沈阳大学,2016.
[10]黄宏,陶忠,韩林海.圆中空夹层钢管混凝土柱轴压工作机理研究[J].工业建筑,2006,36(11):11-14.
[11] XIONG M X,XIONG D X,LIEW J Y R. Axial Performance of Short Concrete Filled Steel Tubes with High-and Ultra-High-Strength Materials[J].Engineering Structures,2017,136:494-510.
[12]谭克锋,蒲心诚,蔡绍怀.钢管超高强混凝土的性能与极限承载能力的研究[J].建筑结构学报,1999(1):10-15.