火灾下钢筋混凝土梁温度场数值模拟研究  

Numerical Simulation of Temperature Field of Reinforced Concrete Beams under Fire

作　　者：刘宽宇 杨晓娟 汤铁铮 刘俊[1] 金晓清[1] LIU Kuanyu;YANG Xiaojuan;TANG Tiezheng;LIU Jun;JIN Xiaoqing(School of Aeronautics and Astronautics,Chongqing University,Chongqing 400044,China;Xiamen Zhonggou Information Technology Co.,Ltd.,Xiamen 361000,China)

机构地区：[1]重庆大学航空航天学院,重庆400044 [2]厦门中构信息技术有限公司,福建厦门361000

出　　处：《河南科技》2023年第2期31-34,共4页Henan Science and Technology

基　　金：厦门市建设科技计划项目“钢筋桁架楼承板力学与耐火性能改良研究”(XJK2020-1-18);厦门市建设科技计划项目“装配式建筑预制构件抗震力学性能研究”(XJK2021-1-18)。

摘　　要：【目的】为研究钢筋混凝土梁在火灾作用下的抗火性能。【方法】运用ABAQUS有限元软件来建立钢筋混凝土梁传热模型,模拟钢筋混凝土梁截面在四面受火作用下的温度场变化情况,并分析梁截面温度的分布规律,从而研究防火涂层类型、涂层厚度对梁截面温度场分布的影响。【结果】研究结果表明,在涂有三种不同防火涂层后,梁截面温度会有不同程度的降低,涂抹相同类型涂料时,涂层越厚,同一时刻下钢筋的温度越低。相对而言,膨胀型防火涂料(超薄型和薄型)对梁截面温度的降低作用更明显。【结论】因此,防火涂层能有效提高钢筋混凝土梁的耐火性能。[Purposes]In order to study the fire resistance of reinforced concrete beams under fire.[Methods]A heat transfer model of reinforced concrete beam was established using ABAQUS finite element software to simulate the temperature field changes of beam cross-section under the action of fire on all sides.The temperature distribution law of beam cross-section was also examined,as well as the effects of fireproof coating type and coating thickness on the temperature field.[Findings]The results indicated that three distinct types of fireproof coatings lowered the temperature of the beam cross-section to varying degrees after application.The greater the coating thickness,the lower the temperature at the reinforcement at the same time when the same type of fireproof coating is applied.Relatively speaking,the intumescent fireproof coating(ultra-thin and thin)has a more pronounced impact on lowering the temperature of the beam section.[Conclusions]Accordingly,fireproof coatings might significantly increase the fire resistance of reinforced concrete beams.

关 键 词：钢筋混凝土梁 有限元 温度场 防火涂层 

分 类 号：TU375.1[建筑科学—结构工程]