| 引用本文: | 刘发起,吉力阿木,杨冬冬,杨华.真实火作用下圆钢管约束钢筋混凝土柱抗火性能[J].哈尔滨工业大学学报,2018,50(12):38.DOI:10.11918/j.issn.0367-6234.201801050 |
| LIU Faqi,JILI Amu,YANG Dongdong,YANG Hua.Fire performance of circular steel tube confined reinforced concrete columns exposed to natural fire[J].Journal of Harbin Institute of Technology,2018,50(12):38.DOI:10.11918/j.issn.0367-6234.201801050 |
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| 真实火作用下圆钢管约束钢筋混凝土柱抗火性能 |
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刘发起1,2,吉力阿木1,2,杨冬冬1,2,杨华1,2
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(1.结构工程灾变与控制教育部重点实验室(哈尔滨工业大学),哈尔滨150090; 2.土木工程智能防灾减灾工业和信息化部重点实验室(哈尔滨工业大学),哈尔滨150090)
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| 摘要: |
| 为分析圆钢管约束钢筋混凝土柱在真实火灾下的抗火性能,通过ABAQUS软件建立了有限元分析模型,包括温度场分析模型和耐火极限分析模型,主要考察参数为火灾升温速率、升温时间以及构件荷载比.真实火灾的温度-时间关系采用欧洲规范Eurocode 1 Part 1-2建议的参数火灾模型计算,并选取了ISO-834标准火灾作为对比.分析结果表明:真实火灾的升温速率越快、升温时间越短,构件的截面温度梯度越大；真实火灾作用下,圆钢管约束钢筋混凝土柱不仅可能会在升温过程中发生破坏,也可能会在降温过程中发生破坏；基于等效曝火时间的方法,将计算得到的真实火灾下耐火极限转换为标准火灾下的等效耐火极限,当真实火灾升温速率小于标准火灾速率时,采用标准火灾曲线得到的耐火极限比等效耐火极限小；而当真实火灾升温速率大于标准火灾时,采用标准火灾曲线得到的耐火极限比等效耐火极限大,即按标准火灾下进行的设计偏于不安全,建议按照真实火灾进行抗火设计. |
| 关键词: 圆钢管约束钢筋混凝土柱 真实火灾 有限元分析 耐火极限 等效曝火时间 |
| DOI：10.11918/j.issn.0367-6234.201801050 |
| 分类号:TU398+.9 |
| 文献标识码:A |
| 基金项目:国家重点研发计划专项(2016YFC0701203)；国家自然科学基金(51508131)；哈工大结构灾变与控制教育部重点实验室开放基金 (HITCE201610) |
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| Fire performance of circular steel tube confined reinforced concrete columns exposed to natural fire |
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LIU Faqi1,2,JILI Amu1,2,YANG Dongdong1,2,YANG Hua1,2
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(1.Key Lab of Structures Dynamic Behavior and Control ( Harbin Institute of Technology), Ministry of Education, Harbin 150090, China; 2.Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters (Harbin Institute of Technology), Ministry of Industry and Information Technology, Harbin 150090, China)
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| Abstract: |
| To investigate the fire performance of circular steel tube confined reinforced concrete (STCRC) columns exposed to natural fire, a finite element model including thermal analysis model and stress analysis model was developed using the software ABAQUS. The main considered parameters were fire heating rate, heating duration time and load ratio. Parametric temperature-time curves recommended by Eurocode 1 were employed as the temperature curves of natural fire, and the ISO-834 standard fire curve was selected as a comparison. The results showed that the faster heating rate and the shorter heating duration time of nature fire resulted in the higher temperature gradient of the composite cross section. Circular STCRC columns exposed to natural fire might fail in the heating phase or the cooling phase. Based on the method of equivalent fire exposure time, the fire resistance under natural fire and standard fire could be converted reciprocally and then compared with each other. It was found that fire safety design with ISO-834 standard fire curve was conservative when the heating rate of natural fire was slower than that of the standard fire. However, fire safety design with ISO-834 standard fire curve was unsafe when the heating rate of natural fire was faster than that of the standard one. Thus, natural fire curve in fire safety design is recommended for this condition. |
| Key words: circular steel tube confined reinforced concrete column natural fire finite element analysis fire resistance equivalent exposure time |
