火灾下钢管混凝土叠合柱-RC梁平面框架内力重分布
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摘要
火灾下钢管混凝土叠合柱-RC梁平面框架结构会产生膨胀变形.由于框架梁、柱的相互约束作用,框架结构不能自由膨胀变形,结构中发生内力重分布,影响框架结构的耐火性能.建立钢管混凝土叠合柱-RC梁平面框架有限元模型,用现有相关试验数据对有限元模型进行对比验证.利用该有限元模型在荷载和ISO-834标准升温作用下对钢管混凝土叠合柱-RC梁平面框架结构的内力重分布进行分析,并进行柱火灾荷载比和梁火灾荷载比不同作用下框架结构内力重分布的参数分析.研究表明:框架结构特征截面处内力变化剧烈;柱火灾荷载比和梁火灾荷载比对框架结构内力重分布产生显著影响,火灾作用下框架节点处梁端弯矩最大值约为常温值的3.8倍,应加强结构节点设计.
In case of fire, expansion deformation may occur in a framed structure with concrete-filled steel tube reinforced composite column and RC beam, but the framed structure can not implement freely the expanding deformation due to the mutual restriction of the column and reinforced and the redistribution of internal force occurs in the framed structure, affecting the fire resistance performance of the framed structure. A finite element model of plane framed structure with concrete-filled steel tube reinforced composite(CFSTRC) column and RC beam was established and it was validated with relevant test data. The internal force redistribution of the plane frame structure was analyzed under the load and ISO-834 standard temperature rise and the parametric analysis of the internal force redistribution of the frame under different column-to-fire load ratio and the beam-to-fire load ratio was also carried out. The investigation result showed that the internal forces would change greatly at the characteristic section of the framed structure, the column-to-fire load ratio and the beam-to-fire load ratio would have a significant influence on the internal forced redistribution of the framed structure, the maximum bending moment at the joint of the frame would be about 3.8 times of that at normal temperature of beam end in joint in case of fire, so that the design of the joint of the structure should be strengthened.
In case of fire, expansion deformation may occur in a framed structure with concrete-filled steel tube reinforced composite column and RC beam, but the framed structure can not implement freely the expanding deformation due to the mutual restriction of the column and reinforced and the redistribution of internal force occurs in the framed structure, affecting the fire resistance performance of the framed structure. A finite element model of plane framed structure with concrete-filled steel tube reinforced composite(CFSTRC) column and RC beam was established and it was validated with relevant test data. The internal force redistribution of the plane frame structure was analyzed under the load and ISO-834 standard temperature rise and the parametric analysis of the internal force redistribution of the frame under different column-to-fire load ratio and the beam-to-fire load ratio was also carried out. The investigation result showed that the internal forces would change greatly at the characteristic section of the framed structure, the column-to-fire load ratio and the beam-to-fire load ratio would have a significant influence on the internal forced redistribution of the framed structure, the maximum bending moment at the joint of the frame would be about 3.8 times of that at normal temperature of beam end in joint in case of fire, so that the design of the joint of the structure should be strengthened.
引文
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[11] LIE T T.Fire resistance of circular steel columns filled with bar-reinforced concrete [J].Journal of Structural Engineering,1994,120(5):1489-1509.
[12] International Organization for Standardization.Fire-resistance tests elements of building construction:part 1,general requirements ISO-834 [S].Geneva,Switzerland:International Organization for Standardization,1999.
[13] 韩林海,宋天诣.钢-混凝土组合结构抗火设计原理 [M].北京:科学出版社,2012:356-370.
[14] 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,2007:542-547.
[15] 包延红,孙建刚,王文达,等.钢管混凝土叠合柱-钢筋混凝土梁平面框架耐火性能有限元分析 [J].建筑结构学报,2015,36(增刊1):47-53.
[16] 中国工程建设标准化协会.钢管混凝土叠合柱结构技术规程:CECS 188:2005 [S].北京:中国计划出版社,2005.
[2] 徐蕾,刘玉彬.钢管混凝土叠合柱耐火性能研究 [J].建筑结构学报,2014,35(6):33-41.
[3] 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,2014,31(增刊):109-114.
[4] 冯颖慧,沈陶,楼文娟,等.内配圆钢管的钢骨混凝土柱火灾后剩余承载力研究 [J].工业建筑,2008,38(3):16-19.
[5] 时旭东,过镇海.高温下钢筋混凝土框架的受力性能试验研究 [J].土木工程学报,2000,33(1):36-45.
[6] 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.
[7] 陈适才,任爱珠,陆新征.火灾下空间混凝土框架结构的反应分析与模拟 [J].自然灾害学报,2007,16(6):88-92.
[8] 吴波,何喜洋.高温下钢筋混凝土框架的内力重分布研究 [J].土木工程学报,2006,39(9):54-61.
[9] HAN Linhai,WANG Weihua,YU Hongxia.Experimental behaviour of reinforced concrete (RC) beam to concrete-filled steel tubular (CFST) column frames subjected to ISO-834 standard fire [J].Engineering Structures,2010,32(10):3130-3144.
[10] 周侃,韩林海,宋天诣.钢管混凝土柱-RC梁平面框架耐火性能分析 [J].工程力学,2014,31(增刊1):41-45.
[11] LIE T T.Fire resistance of circular steel columns filled with bar-reinforced concrete [J].Journal of Structural Engineering,1994,120(5):1489-1509.
[12] International Organization for Standardization.Fire-resistance tests elements of building construction:part 1,general requirements ISO-834 [S].Geneva,Switzerland:International Organization for Standardization,1999.
[13] 韩林海,宋天诣.钢-混凝土组合结构抗火设计原理 [M].北京:科学出版社,2012:356-370.
[14] 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,2007:542-547.
[15] 包延红,孙建刚,王文达,等.钢管混凝土叠合柱-钢筋混凝土梁平面框架耐火性能有限元分析 [J].建筑结构学报,2015,36(增刊1):47-53.
[16] 中国工程建设标准化协会.钢管混凝土叠合柱结构技术规程:CECS 188:2005 [S].北京:中国计划出版社,2005.