摘要
为了得到标准升温下耐火钢-混凝土组合梁截面抗弯极限承载力-时间曲线和一定荷载比下组合梁的耐火极限,基于舞钢耐火钢Q345-FR钢板高温力学性能试验结果,采用有限元方法对耐火钢-混凝土组合梁的抗火性能进行高温稳态分析和瞬态分析.考察混凝土板尺寸、钢梁截面尺寸、涂料厚度、荷载比等参数对高温下组合梁承载力和耐火极限的影响.提出耐火钢组合梁高温下承载力和耐火极限计算公式,公式计算结果与有限元结果非常吻合.将有限元计算结果与规程CECS200:2006方法的计算结果进行对比分析,结果表明规程方法偏于保守,受火时间越长,保守程度越大;建议将腹板和下翼缘的温度分开计算,修正后的规范方法计算耐火钢-混凝土组合梁的抗火性能更为合理.
The fire performances of FRSCCB at both steady and transient state were analyzed based on the high-temperature mechanical properties of the Q345 fire-resistant steel produced by the Wuyang Iron and Steel Co.Ltd.in order to analyze the fire resistance time and the bending bearing capacity of fire-resistant steel-concrete composite beams（FRSCCB）.The effects of the section size of concrete slab and steel beam,the load-ratio and the fire-insulation thickness of the steel beam on both the fire resistance time and the bending bearing capacity were analyzed.The simplified calculation formulas for predicting the bending bearing capacity and the fire resistance time were deduced with high accuracy compared with the finite element（FE）results.The FE results were compared with the bending bearing capacity predicted by Chinese code CECS200：2006.The code method is over conservative when the fire duration time is long.The temperature of the web is suggested to be calculated separately from that of the bottom flange.It is more reasonable to analyze the fire resistance of the FRSCCB by the improved method.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2017年第8期1482-1493,共12页
Journal of Zhejiang University：Engineering Science
基金
国家"十二五"科技支撑计划资助项目(2012BAJ13B04)
关键词
耐火钢
钢-混凝土组合梁
耐火极限
抗弯承载力
抗火设计
fire-resistant steel
steel-concrete composite beam
fire resistance
bending bearing capacity
fire-resistant design
作者简介
蒋翔（1989-）男,博士生,从事钢结构稳定性和抗火等研究.ORCID：0000-0002-9164-3452.E-mail：dvl@zu.edu.cn
通信联系人：童根树,男,教授,博导.ORCID：0000-0002-3985-8425.E-mail：tonggs@zu.edu.cn
