| 屈立军,史可贞.钢筋混凝土矩形梁在实际火灾下正截面承载力数值计算[J].火灾科学,2009,18(2):59-64. |
| 钢筋混凝土矩形梁在实际火灾下正截面承载力数值计算 |
| Numerical analysis of fire resistance of rectangular RC beam exposed to fire in a compartment |
| 投稿时间：2009-02-04 修订日期：2009-03-18 |
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| DOI：10.3969/j.issn.1004-5309.年.期.顺序 |
| 基金项目:国家科技支撑计划项目资助,课题编号:2006BAK06B05-1 |
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| 中文关键词: 钢筋混凝土梁 实际火灾 火灾荷载 开口因子 承载力 |
| 英文关键词:RC beam Fire in a compartment Fire load Ventilation factor Fire resistance. |
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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,以建筑结构耐火理论为基础,采用数值计算方法研究钢筋混凝土矩形梁的正截面承载力。研究结果表明:梁的承载力随火灾房间温度升高而变小,在温度达到最大值后承载力达到最小值。火灾房间火灾荷载越大,开口因子越小,火作用越大,梁的最小承载力越小;反之相反。相同条件下梁支座截面的承载力要大于跨中截面 |
| 英文摘要: |
| In order to evaluate the fire resistance of RC beam,minimum resistance of the RC Rectangular beam exposed to the fire in a compartment is studied by numerical analysis,based on the theory of structure fire resistance.The result illustrates that with the temperature increases,fire resistance of the RC beam gradually decreases.When the temperature of in compartment reaches the highest,fire resistance of the RC beam is the lowest.Higher fire load in a compartment leads to smaller ventilation factor and lower fire resistance of the RC beam.On the same conditions the fire resistance of beam subjected to positive moment is lower than that of beam subjected to negative moment. |
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