| 钢筋混凝土底框架结构框架中柱耐火性能试验研究 |
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| 引用本文： | 屈立军,彭天国,李胜利,李焕群,王跃琴,王兴波. 钢筋混凝土底框架结构框架中柱耐火性能试验研究[J]. 土木工程学报, 2011, 0(2) |
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| 作者姓名： | 屈立军 彭天国 李胜利 李焕群 王跃琴 王兴波 |
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| 作者单位： | 中国人民武装警察部队学院; |
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| 基金项目： | 国家“十一五”科技支撑计划项目(2006BAK06B05-1) |
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| 摘 要： | 底框架结构因其自身特点耐火性较差,可能在火灾中发生倒塌。为正确评估该类结构的耐火性能,以木方为燃料进行6栋建筑火灾试验。结果表明:①与钢筋混凝土全框架相比,底框架结构耐火性差,当下部商业用房存在较多可燃物,人为干预火灾失效时倒塌可能性较大。②钢筋混凝土构件在火灾中的热膨胀变形较大,混凝土的后期强度对耐火性能影响也很大,评估或预测该类结构的耐火性能时必须考虑温度内力和混凝土的后期强度。③混凝土龄期在1年半以上,立方体强度不超过50MPa时,火灾中一般不会发生爆裂。④建筑物竖向变形和中柱裂缝可作为中柱失效的预兆:在火灾轰燃后60m in以上,当建筑物竖向变形在10m in内压缩均值达到2mm;当四面受火柱的混凝土本体在其截面宽度(或高度)中间部位发生竖向裂缝,尤其是形成较长或较宽裂缝,或某处出现较密集裂缝时。建议:当下部商用房间火灾荷载较大时,采用增大截面尺寸的方式适当降低轴压比。
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| 关 键 词： | 底框架结构中柱 耐火性能 膨胀变形 后期强度 裂缝 失效 |
Experimental study on fire resistance of interior column in bottom RC frame |
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| Qu Lijun Peng Tianguo Li Shengli Li Huanqun Wang Yueqin Wang Xingbo. Experimental study on fire resistance of interior column in bottom RC frame[J]. China Civil Engineering Journal, 2011, 0(2) |
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| Authors: | Qu Lijun Peng Tianguo Li Shengli Li Huanqun Wang Yueqin Wang Xingbo |
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| Affiliation: | Qu Lijun Peng Tianguo Li Shengli Li Huanqun Wang Yueqin Wang Xingbo (Chinese People's Armed Police Forces Academy,Langfang 065000,China) |
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| Abstract: | Because of its characteristics,Bottom RC frame is poor in fire resistance,and,may collapse when in fire.In order to evaluate the fire resistance capability of this type of structure correctly,fire tests were carried out separately in six buildings,using wood as fuel.The results show that:(1) Bottom RC frame is worse than the RC frame in fire resistance.The building is more likely to collapse,when much more fuel is deposited in the first floor of the building and human intervention fire failed.(2) RC structu... |
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| Keywords: | interior column in bottom RC frame fire resistance thermal expansion deformation post-strength crack failure |
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