| 屈立军,史可贞.钢筋混凝土矩形梁的当量耐火时间[J].火灾科学,2009,18(3):168-174. |
| 钢筋混凝土矩形梁的当量耐火时间 |
| T-equivalent used to assess the fire resistance of RC rectangular beam |
| 投稿时间：2009-04-16 修订日期：2009-06-10 |
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| DOI：10.3969/j.issn.1004-5309.年.期.顺序 |
| 基金项目:国家科技支援计划项目资助,课题编号:2006BAK06B05-1 |
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| 中文关键词: 钢筋混凝土梁 当量耐火时间 火灾荷载 开口因子 |
| 英文关键词:RC beam T-equivalent Fire load Ventilation factor |
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| 中文摘要: |
| 为了正确评估钢筋混凝土矩形梁在实际火灾条件下的承载力,以一般室内火灾轰燃后的房间平均温度-时间曲线为火作用,以热传导和建筑结构耐火理论为基础,以梁在实际和标准火灾下的承载力相等为等效准则,用数值计算方法研究梁的当量耐火时间,并用最小二乘法导出其计算公式。火灾房间火灾荷载越大,开口因子越小,梁的当量耐火时间越长;反之越短。所给梁的当量耐火时间可用于建筑结构性能化耐火设计与评估:当火灾荷载密度较大,开口因子较小时加大梁的截面参数以获得安全性,反之,减小截面参数以获得经济性。 |
| 英文摘要: |
| In order to evaluate the fire resistance of RC beam exposed to the fire in a compartment,the equivalent fire-resistance time of the beam is studied by numerical analysis,based on the theory of unsteady heat transfer,in terms of the principle that the RC beam exposed to the post-flashover fire of a compartment and standard fire has equal bearing capacity.The equivalent fire-resistance time regression formula is fitted.The result illustrates that higher fire load or smaller ventilation factor in a compartment would achieve longer equivalent fire-resistance time of the RC beam.The regression formula given in this paper can be applied to fire resistance design and evaluation of the RC beam: if with higher fire load or smaller ventilation factor,bigger cross-section beam should be adopted to acquire safety;otherwise,smaller cross-section beam can be adopted. |
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