高温下钢筋混凝土异形柱空间框架的试验研究
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摘要
开展了3榀足尺钢筋混凝土异形柱空间框架在ISO834标准升温过程下的明火试验,考察了荷载水平和梁柱刚度比对框架破坏形态、关键部位变形历程以及耐火极限的影响.试验结果表明:破坏阶段框架梁呈现出类似悬链索的受力形态;框架节点不同方向水平线位移和该方向相邻框架梁的轴向膨胀量密切相关;框架梁不变、梁柱刚度比增大时,在升温中、后期异形柱空间框架的节点转角呈现更为明显的减小甚至反向趋势;较大的荷载水平会使框架更容易达到其耐火极限,但梁柱刚度比却对框架耐火极限影响不大.研究表明,从结构层次进行抗火研究可以更全面地把握结构及其各组成部分的火灾行为.
Three full-scale reinforced concrete space frames with specially-shaped columns were tested following the ISO834 standard heating process,and the influences of loading level and beam-to-column stiffness ratio on the failure mode,displacement-time curve and fire resistance of the specimens were investigated.Experimental results show that(1) the frame beams in the failure stage reveal a force pattern similar to catenary action;(2) the horizontal linear displacement of the frame joints in different directions are closely related to the axial expansion of the adjacent frame beam in the same direction;(3) when the frame beam keeps unchanged,the rotation of beam-to-column joints obviously decreases and even becomes opposite with the increase of column stiffness ratio in the middle and later stages of the test;and(4) high loading levels make the specimen reach its fire resistance more easily,but the beam-to-column stiffness ratio has no obvious effect on fire resistance.It is thus concluded that the research on the fire resistance of a total structure is more convenient to the investigation of fire performance of the structure and its components.
Three full-scale reinforced concrete space frames with specially-shaped columns were tested following the ISO834 standard heating process,and the influences of loading level and beam-to-column stiffness ratio on the failure mode,displacement-time curve and fire resistance of the specimens were investigated.Experimental results show that(1) the frame beams in the failure stage reveal a force pattern similar to catenary action;(2) the horizontal linear displacement of the frame joints in different directions are closely related to the axial expansion of the adjacent frame beam in the same direction;(3) when the frame beam keeps unchanged,the rotation of beam-to-column joints obviously decreases and even becomes opposite with the increase of column stiffness ratio in the middle and later stages of the test;and(4) high loading levels make the specimen reach its fire resistance more easily,but the beam-to-column stiffness ratio has no obvious effect on fire resistance.It is thus concluded that the research on the fire resistance of a total structure is more convenient to the investigation of fire performance of the structure and its components.
引文
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[9]李晓轩,严士超.钢筋混凝土T形柱斜撑框架抗震性能试验研究[J].建筑结构,2001,31(1):19-22.Li Xiao-xuan,Yan Shi-chao.Experimental study on earth-quake resistant behavior of RC T-shaped column bracedframe[J].Building Structure,2001,31(1):19-22.
[10]吴波,徐玉野.高温下钢筋混凝土异形柱的试验研究[J].建筑结构学报,2007,28(5):24-31.Wu Bo,Xu Yu-ye.Experimental study on reinforced con-crete columns with special shaped cross section subjec-ted to high temperature[J].Journal of Building Struc-tures,2007,28(5):24-31.
[11]姚亚雄,朱伯龙.钢筋混凝土框架结构抗火试验研究[J].同济大学学报,1996,24(6):619-624.Yao Ya-xiong,Zhu Bo-long.Experimental studies on fire-resistance of reinforced concrete frames[J].Journal ofTongji University,1996,24(6):619-624.
[12]时旭东,过镇海.高温下钢筋混凝土框架受力性能的试验研究[J].土木工程学报,2000,33(1):36-45.Shi Xu-dong,Guo Zhen-hai.Experimental investigationof behavior of reinforced concrete frames at elevated tem-perature[J].China Civil Engineering Journal,2000,33(1):36-45.
[13]GB/T9978—1999,建筑构件耐火试验方法[S].
[14]B P休斯.钢筋混凝土设计的极限状态理论[M].俞同华,译.上海:同济大学出版社,1995:396-397.
[2]康谷贻,巩长江.单调及低周反复荷载作用下异形截面框架柱的受剪性能[J].建筑结构学报,1997,18(5):22-31.Kang Gu-yi,Gong Chang-jiang.Shear properties of T andL-shaped section frame columns under monotonic and ho-rizontal lowcyclic loadings[J].Journal of Building Struc-tures,1997,18(5):22-31.
[3]郑明星,唐家祥.异形柱框架结构计算模型探讨[J].华中科技大学学报:城市科学版,2002,19(4):17-19.Zheng Ming-xing,Tang Jia-xiang.Discussion on the calcu-lating model of lightweight framed structures with special-shaped columns[J].Journal of Huazhong University ofScience and Technology:Urban Science,2002,19(4):17-19.
[4]曹祖同,陈云霞,吴戈,等.钢筋混凝土异形柱框架节点强度的研究[J].建筑结构,1999,29(1):42-46.Cao Zu-tong,Chen Yun-xia,Wu Ge,et al.Research onshear strength of RC beam to special-shaped column joints[J].Building Structures,1999,29(1):42-46.
[5]曹万林,胡国振,崔立长,等.钢筋混凝土带暗柱异形柱抗震性能试验及分析[J].建筑结构学报,2002,23(1):16-20,26.Cao Wan-lin,Hu Guo-zhen,Cui Li-chang,et al.Experi-ment and analysis of seismic behaviour of the L,T-shapedcolumns with concealed columns[J].Journal of BuildingStructures,2002,23(1):16-20,26.
[6]黄选明,曹万林,崔建升,等.带交叉钢筋T形截面短柱抗震性能试验研究[J].地震工程与工程振动,2003,23(1):90-94.Huang Xuan-ming,Cao Wan-lin,Cui Jian-sheng,et al.Experiment and analysis of seismic behavior of short T-shaped columns with crossed reinforcing bars[J].Earth-quake Engineering and Engineering Vibration,2003,23(1):90-94.
[7]曹万林,黄选明,王普山,等.带交叉筋十字形短柱抗震性能试验研究[J].地震工程与工程振动,2002,22(5):41-45.Cao Wan-lin,Huang Xuan-ming,Wang Pu-shan,et al.Ex-periment and analysis of seismic behavior of short+_shaped columns with crossed reinforcing bars[J].Earth-quake Engineering and Engineering Vibration,2002,22(5):41-45.
[8]刘军进,吕志涛,冯健.9层(带转换层)钢筋混凝土异形框架结构模型振动台试验研究[J].建筑结构学报,2002,23(1):21-26.Liu Jun-jin,L櫣Zhi-tao,Feng Jian.Study on shaking tabletest of a 9 storey RC frame model with specially shapedcolumns and transfer storey[J].Journal of BuildingStructures,2002,23(1):21-26.
[9]李晓轩,严士超.钢筋混凝土T形柱斜撑框架抗震性能试验研究[J].建筑结构,2001,31(1):19-22.Li Xiao-xuan,Yan Shi-chao.Experimental study on earth-quake resistant behavior of RC T-shaped column bracedframe[J].Building Structure,2001,31(1):19-22.
[10]吴波,徐玉野.高温下钢筋混凝土异形柱的试验研究[J].建筑结构学报,2007,28(5):24-31.Wu Bo,Xu Yu-ye.Experimental study on reinforced con-crete columns with special shaped cross section subjec-ted to high temperature[J].Journal of Building Struc-tures,2007,28(5):24-31.
[11]姚亚雄,朱伯龙.钢筋混凝土框架结构抗火试验研究[J].同济大学学报,1996,24(6):619-624.Yao Ya-xiong,Zhu Bo-long.Experimental studies on fire-resistance of reinforced concrete frames[J].Journal ofTongji University,1996,24(6):619-624.
[12]时旭东,过镇海.高温下钢筋混凝土框架受力性能的试验研究[J].土木工程学报,2000,33(1):36-45.Shi Xu-dong,Guo Zhen-hai.Experimental investigationof behavior of reinforced concrete frames at elevated tem-perature[J].China Civil Engineering Journal,2000,33(1):36-45.
[13]GB/T9978—1999,建筑构件耐火试验方法[S].
[14]B P休斯.钢筋混凝土设计的极限状态理论[M].俞同华,译.上海:同济大学出版社,1995:396-397.
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