型钢混凝土构件截面温度场有限元分析  

FINITE ELEMENT ANALYSIS OF TEMPERATURE FIELD IN CROSS SECTION OF STEEL REINFORCED CONCRETE MEMBERS

作　　者：徐树全 杨冬冬 曾庆龙 高广臣 XU Shuquan,YANG Dongdong,ZENG Qinglong,GAO Guangchen(1 Architectureal Design and Research Institute ,Harbin Institute of Technology, Harbin 150090,China;2 School of Civil Engi., Harbin Institute of Technology, Harbin 150090,Chin)

机构地区：[1]哈尔滨工业大学建筑设计研究院,哈尔滨150090 [2]哈尔滨工业大学土木工程学院,哈尔滨150090

出　　处：《低温建筑技术》2018年第7期51-56,共6页Low Temperature Architecture Technology

摘　　要：采用ABAQUS有限元软件,对规范规定的最小截面尺寸和最小混凝土保护层厚度的型钢混凝土柱、梁和剪力墙截面的温度场进行了分析,考虑了型钢和混凝土间的界面接触热阻,分析了型钢含钢率以及火灾降温段的影响。结果表明:考虑界面接触热阻可得到更为精确的温度结果;型钢含钢率越大,型钢截面的最大温度越低;考虑火灾降温段的影响时,内部型钢存在升温滞后现象,型钢含钢率在4%~5%范围内时,一级耐火升温时间的型钢混凝土柱、梁、剪力墙的型钢最大温度分别为314.27℃、485.32℃和428.51℃。对于内部型钢位置处的最大温度,可偏于保守的参照钢筋混凝土截面的计算结果取值。Finite element（FE） models by commercial software ABAQUS are built to analyze the temperature distribution of steel reinforced concrete（SRC） member sections including columns,beams as well as shear walls. The minimum cross-section dimensions and concrete cover depths were selected to do the analysis according to the designing codes. The thermal resistance between concrete surface and profile surface was considered in the FE model and the influence of steel ratio and fire cooling phase was investigated. It is found that the simulation results will be more accurate if the thermal resistance is considered and the increasing of steel ratio will result in lower temperature in the steel profile section.When the effect of fire cooling section is considered, There is a phenomenon of temperature rise hysteresis for internal steels. When the steel content of steel bars is in the range of 4% to 5%, the maximum temperatures of the profiled steel concrete columns, beams, and shear walls of the first time fire-resistance heating time are 314.27℃, 485.32℃, and 428.51℃. The temperature results of reinforced concrete sections can be conservatively adopted for SRC sections.

关 键 词：型钢混凝土 温度场 有限元 含钢率 热阻 降温段 

分 类 号：TU375[建筑科学—结构工程]