耐火钢-混凝土简支组合梁抗火性能

发布时间：2018-06-27 08:34

本文选题：耐火钢 + 组合梁　；参考：《哈尔滨工业大学学报》2017年12期

【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.
[Abstract]:In order to study the deformation behavior and fire resistance limit of fire resistant steel-concrete simply supported composite beams, Based on the finite element software Abaqus analysis model, the fire resistance performance of fire resistant steel-concrete simply supported composite beams protected by fire resistant coating and fireproof slab was simulated under the standard temperature rising condition. The effects of load ratio, fire protection layer, material strength, section size and longitudinal reinforcement in concrete floor on the fire resistance limit of composite beams are analyzed. The results show that the load ratio and the thickness of the fire proof cover are the two most important factors affecting the fire resistance of the fire resistant steel-concrete simply supported composite beams. The thickness of steel beam and the width of flange have a certain beneficial effect on the fire resistance of steel-concrete composite beam. The material strength, steel beam height and slab thickness, floor width and the diameter of longitudinal steel bar in the floor have little effect on the fire resistance limit of the fireproof steel-concrete simply supported composite beam. Under the same condition, the fire-proof board has better fire-proof protection effect than the fire-proof coating. When the load ratio is 0.5 ~ 0.7, the fire resistance limit of steel-concrete simply supported composite beam is increased by 35% and 40% after replacing ordinary steel with refractory steel, and the thickness of fire resistant coating can be reduced by about 30%. The fire resistance limit of simply supported composite beams with refractory steel and concrete is calculated by using the method of China Code (CECs 200: 2006), which is less conservative than the results of finite element calculation.
【作者单位】：浙江大学建筑工程学院;
【基金】：国家科技支撑计划(2012BAJ13B04)
【分类号】：TU352.5;TU398.9

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