| 引用本文: | 蒋翔,童根树,张磊.耐火钢-混凝土简支组合梁抗火性能[J].哈尔滨工业大学学报,2017,49(12):68.DOI:10.11918/j.issn.0367-6234.201610101 |
| JIANG Xiang,TONG Genshu,ZHANG Lei.Fire-resistance performance of simply supported fire-resistant steel-concrete composite beams[J].Journal of Harbin Institute of Technology,2017,49(12):68.DOI:10.11918/j.issn.0367-6234.201610101 |
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| 摘要: |
| 为研究耐火钢-混凝土简支组合梁在火灾下的变形性能和耐火极限，基于有限元软件ABAQUS建立的分析模型分别对采用防火涂料和防火板保护的耐火钢-混凝土简支组合梁标准升温下的抗火性能进行模拟.分析了荷载比、防火保护层、材料强度、截面尺寸、混凝土楼板中纵向钢筋等因素对组合梁耐火极限的影响.结果表明：荷载比和防火保护层厚度是影响耐火钢-混凝土简支组合梁抗火性能最重要的两个因素.钢梁板件厚、翼缘宽等对耐火钢-混凝土组合梁的抗火性能有一定有利影响.材料强度、钢梁高和楼板厚、楼板宽和楼板中纵向钢筋直径对耐火钢-混凝土简支组合梁的耐火极限影响不大.同等条件下防火板比防火涂料具有更好的防火保护效果.当荷载比为0.5~0.7时，使用耐火钢替换普通钢后钢-混凝土简支组合梁的耐火极限提高35%~40%，可减小防火涂料厚度30%左右.采用中国规范(CECS 200：2006)中的方法计算耐火钢-混凝土简支组合梁的耐火极限，和有限元计算结果相比荷载比较小时偏保守.
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| 关键词: 耐火钢 组合梁 参数分析 抗火性能 耐火极限 |
| DOI：10.11918/j.issn.0367-6234.201610101 |
| 分类号:TU352.5; TU375.1 |
| 文献标识码:A |
| 基金项目:国家科技支撑计划(2012BAJ13B04) |
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| Fire-resistance performance of simply supported fire-resistant steel-concrete composite beams |
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JIANG Xiang,TONG Genshu,ZHANG Lei
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(Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China)
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| Abstract: |
| To study the fire performances of the simply supported fire-resistant steel-concrete composite beams (FRSCCB), the simply supported FRSCCB with fireproof coating and fire-proof board under standard fire were simulated by the finite element (FE) software ABAQUS. The effects of the load-ratio, the fire-insulation of the steel beam, the strength of materials, the section profiles and the diameter of longitudinal rebars in the concrete slab on the fire performance of the simply supported FRSCCB were analyzed. It is shown that the two most important factors, which influence the fire resistance for the simply supported FRSCCB, are the load-ratio and the fire-insulation thickness of the steel beam. The thicknesses of the beam plates and the width of the beam flange have favorable effect on the FRSCCB performance, but the strength of materials, the height of the beam, the thickness of the slab and diameter of the rebars have less influence. The fire-proof board has better fire-proof protection effect than the fire-proof coating under the same condition. When load ratio is 0.5~0.7, the fire-resistance limitation is increased by over 35% and the fire-insulation thickness can be decrease by 30% when the FRSCCB is used. The simplified calculation method for predicting the fire resistance limit according to Chinese code (CECS 200:2006) is conservative compared with the FE results when the load-ratio is small.
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| Key words: fire-resistant steel composite beam parameter analysis fire resistance performance fire resistance limit |
