耐火钢-混凝土组合梁耐火极限和承载力
发布时间：2018-11-14 16:15
【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.
[Abstract]:In order to obtain the flexural ultimate load-time curve of the section of fireproof steel-concrete composite beam under standard temperature rise and the fire resistance limit of composite beam under certain load ratio, based on the test results of high-temperature mechanical properties of Q345-FR steel sheet of Wuyang Iron and Steel Co. The high temperature steady-state analysis and transient analysis of fire resistance of refractory steel-concrete composite beams were carried out by finite element method. The effects of concrete slab size, steel beam section size, coating thickness and load ratio on the bearing capacity and fire resistance of composite beams at high temperature were investigated. A formula for calculating the bearing capacity and fire resistance limit of refractory steel composite beams at high temperature is presented. The calculated results are in good agreement with the finite element results. The results of finite element method and CECS200:2006 method are compared. The results show that the procedure method is conservative, the longer the fire is, the greater the conservative degree is. It is suggested that it is more reasonable to calculate the temperature of web plate and lower flange separately and to calculate the fire resistance of refractory steel-concrete composite beam by the modified code method.
【作者单位】： 浙江大学建筑工程学院;
【分类号】：TU398.9
本文编号：2331669
[Abstract]:In order to obtain the flexural ultimate load-time curve of the section of fireproof steel-concrete composite beam under standard temperature rise and the fire resistance limit of composite beam under certain load ratio, based on the test results of high-temperature mechanical properties of Q345-FR steel sheet of Wuyang Iron and Steel Co. The high temperature steady-state analysis and transient analysis of fire resistance of refractory steel-concrete composite beams were carried out by finite element method. The effects of concrete slab size, steel beam section size, coating thickness and load ratio on the bearing capacity and fire resistance of composite beams at high temperature were investigated. A formula for calculating the bearing capacity and fire resistance limit of refractory steel composite beams at high temperature is presented. The calculated results are in good agreement with the finite element results. The results of finite element method and CECS200:2006 method are compared. The results show that the procedure method is conservative, the longer the fire is, the greater the conservative degree is. It is suggested that it is more reasonable to calculate the temperature of web plate and lower flange separately and to calculate the fire resistance of refractory steel-concrete composite beam by the modified code method.
【作者单位】： 浙江大学建筑工程学院;
【分类号】：TU398.9
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