Creep of domestic high strength Q960 steel at elevated temperature and its effect on fire resistance of steel columns
Li Xiang1 Wang Weiyong1,2 Zhang Yanhong1
1. School of Civil Engineering, Chongqing University, Chongqing 400045, China;2. Key Laboratory of New Technology for
Construction of Cities in Mountain Area of the Ministry of Education, Chongqing University, Chongqing 400045, China
Abstract：In order to obtain the creep strain of domestic high strength Q960 steel at elevated temperature, tensile creep tests at elevated temperatures were carried out to generate the creep-time curves under various temperature and stress levels. A creep model of Q960 steel suitable for analysis fire resistance of Q960 steel structure was proposed based on the test data. A finite element model was established to analyze the creep effect on the fire resistance of the Q960 steel column. The critical temperature of bare Q960 steel columns was obtained and compared with that code for fire safety of steel structures in buildings (GB 51249). The research results show that the Q960 steel has a noticeable creep strain when the temperature exceeds 600℃, and the higher the temperature is, the greater the total creep deformation is before fracture. The creep effect can significantly reduce the critical temperature and fire resistance of Q960 steel columns, and the critical temperature method in GB 51249 is not suitable for the Q960 steel columns. When the load ratio is less than 0.75, the calculation result of GB 51249 is unsafe. While when the load ratio is more than 0.75, the calculation result is conservative.
李翔 王卫永 张艳红. 国产高强度Q960钢高温蠕变及其对钢柱抗火性能影响[J]. 土木工程学报, 2021, 54(6): 26-34.
Li Xiang Wang Weiyong Zhang Yanhong. Creep of domestic high strength Q960 steel at elevated temperature and its effect on fire resistance of steel columns. 土木工程学报, 2021, 54(6): 26-34.
