相邻两面受火的方钢管约束钢筋混凝土柱耐火极限
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摘要
运用ABAQUS有限元软件建立相邻两面受火的方钢管约束钢筋混凝土柱,并将计算结果与试验结果进行对比,两者吻合良好。通过模拟方钢管约束钢筋混凝土构件在相邻两面受火条件下的温度场和力学场,研究一定参数范围内长细比、含钢率、配筋率、荷载比、荷载偏心率等参数对构件耐火极限的影响,最后针对影响耐火极限的各项参数提出耐火极限简化计算式。研究表明:长细比、荷载比、荷载偏心率对试件耐火极限影响显著。含钢率与配筋率对构件耐火极限影响较小。
The computational model of square tubed reinforced concrete columns under two-adjacent-surface fire action was established with ABAQUS finite element software. The simulated results were in good agreement with test data. The temperature field and mechanical field of square tubed reinforced concrete columns exposed to fire on two adjacent surfaces were studied. And the effects of slenderness ratio,steel ratio,reinforcement ratio,load ratio and load eccentricity on the fire resistance of the specimens were investigated in a certain range of parameters. Finally,the simplified formula for calculating the fire resistance was proposed according to the parameters that affect the fire resistance. The research showed that slenderness ratio,load ratio,and load eccentricity could significantly affect the fire resistance of the specimen. Steel ratio and bar ratio had little effect on the fire resistance of the specimens.
The computational model of square tubed reinforced concrete columns under two-adjacent-surface fire action was established with ABAQUS finite element software. The simulated results were in good agreement with test data. The temperature field and mechanical field of square tubed reinforced concrete columns exposed to fire on two adjacent surfaces were studied. And the effects of slenderness ratio,steel ratio,reinforcement ratio,load ratio and load eccentricity on the fire resistance of the specimens were investigated in a certain range of parameters. Finally,the simplified formula for calculating the fire resistance was proposed according to the parameters that affect the fire resistance. The research showed that slenderness ratio,load ratio,and load eccentricity could significantly affect the fire resistance of the specimen. Steel ratio and bar ratio had little effect on the fire resistance of the specimens.
引文
[1]周绪红,刘界鹏.钢管约束混凝土柱的性能与设计[M].北京:科学出版社,2010.
[2]周绪红,甘丹,刘界鹏,等.方钢管约束钢筋混凝土轴压短柱试验研究与分析[J].建筑结构学报,2011,32(2):68-74.
[3]齐宏拓.钢管约束混凝土轴压和偏压构件静力性能研究[D].哈尔滨:哈尔滨工业大学,2014.
[4]刘发起.火灾下与火灾后圆钢管约束钢筋混凝土柱力学性能研究[D].哈尔滨:哈尔滨工业大学,2014.
[5]潘雁翀.受火后圆钢管约束钢筋混凝土轴压短柱静力性能研究[D].哈尔滨:哈尔滨工业大学,2013.
[6]杨华,吕学涛,张素梅.单面受火的矩形钢管混凝土柱截面温度场分析[J].天津大学学报,2010,43(5):392-399.
[7]杨华,刘发起,吕学涛,等.三面受火的矩形钢管混凝土柱受力机理与耐火极限[J].建筑钢结构进展,2011,13(6):56-63.
[8]吕学涛,杨华,张素梅,等.非均匀火灾作用下方钢管混凝土柱受力机理研究[J].建筑结构学报,2013,34(3):35-44.
[9]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.
[10]张玉琢,吕学涛.单面受火的方钢管约束钢筋再生混凝土柱耐火极限[J].建筑结构学报,2018(增刊1):175-182.
[11]吕学涛,杨华,张素梅.相对两面受火方钢管混凝土耐火极限[J].工业建筑,2012,42(6):148-152.
[12]LIE T T.Fire Resistance of Circular Steel Columns Filled with Bar-Reinforced Concrete[J].Journal of Structural Engineering,ASCE,1994,120(5):1489-1509.
[13]CEN(European Committee for Standardization).BS EN 1994-1-2,Eurocode 4-Design of Composite Steel and Concrete StructuresPart 1-2,General Rules-Structural Fire Design[S].London:British Standards Institution,2005.
[14]LIE T T,STRINGER D C.Calculation of the Fire Resistance of Steel Hollow Structural Section Columns Filled with Plain Concrete[J].Canadian Journal of Civil Engineering,1994,21(3):382-385.
[2]周绪红,甘丹,刘界鹏,等.方钢管约束钢筋混凝土轴压短柱试验研究与分析[J].建筑结构学报,2011,32(2):68-74.
[3]齐宏拓.钢管约束混凝土轴压和偏压构件静力性能研究[D].哈尔滨:哈尔滨工业大学,2014.
[4]刘发起.火灾下与火灾后圆钢管约束钢筋混凝土柱力学性能研究[D].哈尔滨:哈尔滨工业大学,2014.
[5]潘雁翀.受火后圆钢管约束钢筋混凝土轴压短柱静力性能研究[D].哈尔滨:哈尔滨工业大学,2013.
[6]杨华,吕学涛,张素梅.单面受火的矩形钢管混凝土柱截面温度场分析[J].天津大学学报,2010,43(5):392-399.
[7]杨华,刘发起,吕学涛,等.三面受火的矩形钢管混凝土柱受力机理与耐火极限[J].建筑钢结构进展,2011,13(6):56-63.
[8]吕学涛,杨华,张素梅,等.非均匀火灾作用下方钢管混凝土柱受力机理研究[J].建筑结构学报,2013,34(3):35-44.
[9]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.
[10]张玉琢,吕学涛.单面受火的方钢管约束钢筋再生混凝土柱耐火极限[J].建筑结构学报,2018(增刊1):175-182.
[11]吕学涛,杨华,张素梅.相对两面受火方钢管混凝土耐火极限[J].工业建筑,2012,42(6):148-152.
[12]LIE T T.Fire Resistance of Circular Steel Columns Filled with Bar-Reinforced Concrete[J].Journal of Structural Engineering,ASCE,1994,120(5):1489-1509.
[13]CEN(European Committee for Standardization).BS EN 1994-1-2,Eurocode 4-Design of Composite Steel and Concrete StructuresPart 1-2,General Rules-Structural Fire Design[S].London:British Standards Institution,2005.
[14]LIE T T,STRINGER D C.Calculation of the Fire Resistance of Steel Hollow Structural Section Columns Filled with Plain Concrete[J].Canadian Journal of Civil Engineering,1994,21(3):382-385.