非均匀火灾作用下T形薄壁钢管混凝土柱耐火极限
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摘要
运用有限元软件ABAQUS模拟T形带肋薄壁钢管混凝土柱在非均匀受火全过程下的耐火极限,分析了不同受火方式下构件内部温度场和应力场的变化规律及联系,同时探讨加劲肋对二者产生的影响,在此基础之上分析载荷比、载荷偏心率、截面尺寸、计算长度、等因素对耐火极限的影响规律.研究结果表明:受火方式是构件耐火极限的决定因素;加劲肋间距对构件耐火性能影响较小;在不同受火方式下,计算长度、载荷比对耐火极限影响较大;偏心载荷对耐火极限影响复杂,偏向低温区可提高耐火极限.
The finite element software ABAQUS was used to simulate the entire process of T-shaped columns in non-uniform fire. Analysis was performed to study the change rule and relation between distribution of temperature and stress, at the meantime, research the influence of steel bar stiffeners on these two distribution. According to simulation results, the impact of load ratio, effective length, load eccentricity ratio, and steel bar spacing on fire resistance were analyzed. Results show that fire exposure way is determining factor on fire resistance. Steel bar spacing has slight influence on fire resistance. Under difference fire exposure way, effective length and load ratio are main factors on fire resistance. The influence of load angle and eccentricity are complex, and load toward region of low temperature is an effective measure to improve the fire resistance.
The finite element software ABAQUS was used to simulate the entire process of T-shaped columns in non-uniform fire. Analysis was performed to study the change rule and relation between distribution of temperature and stress, at the meantime, research the influence of steel bar stiffeners on these two distribution. According to simulation results, the impact of load ratio, effective length, load eccentricity ratio, and steel bar spacing on fire resistance were analyzed. Results show that fire exposure way is determining factor on fire resistance. Steel bar spacing has slight influence on fire resistance. Under difference fire exposure way, effective length and load ratio are main factors on fire resistance. The influence of load angle and eccentricity are complex, and load toward region of low temperature is an effective measure to improve the fire resistance.
引文
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[10]吕学涛.非均匀受火的方钢管混凝土柱抗火性能与设计[D].哈尔滨:哈尔滨工业大学,2010.
[2]杨远龙.T形组合柱力学性能研究[D].哈尔滨:哈尔滨工业大学,2011.
[3]黎志军,蔡健,谭哲东,等.带约束拉杆异形钢管混凝土柱力学性能的试验研究[J].工程力学,2011(S):124-129.LI Zhijun,CAI Jian,TAN Zhedong,et al.Experimental research on compressive behavior of normal-shaped concrete-filled steel tubular columns with binding bars[J].Engineering Mechanics,2011(S):124-129.
[4]王丹,吕西林.T形、L形钢管混凝土柱抗震性能试验研究[J].建筑结构学报,2005,26(4):39-44.WANG Dan,LV Xilin.Experimental study on seismic behavior of concrete-filled steel T-section and L-section columns[J].Journal of Building Structures,2005,26(4):39-44.
[5]张玉琢,刘海卿,吕学涛.“T”形钢管混凝土芯柱耐火极限数值分析[J].辽宁工程技术大学学报(自然科学版),2014,33(2):198-202.doi:10.3969/j.issn.1008-0562.2014.02.011.ZHANG Yuzhuo,LIU Haiqing,LV Xuetao.Fire resistance numerical analysis of concrete-filled steel tube core of T-shaped cross section[J].Journal of Liaoning Technical University(Natural Science),2014,33(2):198-202.doi:10.3969/j.issn.1008-0562.2014.02.011.
[6]吕学涛,张童,王微微,等.相邻两面受火矩形钢管钢筋混凝土柱耐火极限[J].辽宁工程技术大学学报(自然科学版),2014,33(2):346-349.doi:10.3969/j.issn.1008-0562.2014.03.012LV Xuetao,ZHANG Tong,WANG Weiwei,et al.Fire resistance of re ctangular hollow section steel columns filled with bar-reinforced co ncrete being exposure to adjacent-two-side fire[J].Journal of Liaoni ng Technical University(Natural Science)2014,33(3):346-349.doi:10.3969/j.issn.1008-0562.2014.03.012
[7]LIE T T,IRWIN R J.Fire resistance of rectangular steel columns filled with bar-reinforced concrete[J].Journal of Structural Engineering,1995,121(5):797-805.
[8]韩林海.钢管混凝土结构-理论与实践,2版[M].北京:科学出版社,2007.
[9]侯舒兰,韩林海,宋天诣.钢管混凝土叠合柱耐火性能分析[J].工程力学,2014,(S):109-114.HOU Shulan,HAN Linhai,SONG Tianyi.Analysis on concrete-encased CFST columns under fire[J].Engineering Mechanics,2014,(S):109-114.
[10]吕学涛.非均匀受火的方钢管混凝土柱抗火性能与设计[D].哈尔滨:哈尔滨工业大学,2010.