基于模型温度场更新的钢框架结构抗火混合模拟研究  

Fire resistance hybrid simulation of steel frame structure based on model temperature field updating

作　　者：蔡新江[1,2] 刘超 施涵远 毛小勇[1,2] Cai Xinjiang;Liu Chao;Shi Hanyuan;Mao Xiaoyong(School of Civil Engineering,Suzhou University of Science and Technology,Suzhou Jiangsu 215011,China;Jiangsu Key Laboratory of Structural Engineering,Suzhou University of Science and Technology,Suzhou Jiangsu 215011,China)

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215011 [2]苏州科技大学江苏省结构工程重点实验室,江苏苏州215011

出　　处：《消防科学与技术》2025年第1期68-73,共6页Fire Science and Technology

基　　金：国家自然科学基金项目(51778395);江苏高校“青蓝工程”;江苏省“333工程”;江苏高校优势学科建设工程(PAPD)。

摘　　要：为提高抗火混合模拟中数值子结构的精度,结合模型更新技术,进行基于温度场更新的抗火混合模拟研究,建立火灾下两层两跨钢框架模型,识别试验子结构中实测的温度参数,更新数值子结构中与试验子结构受火情况相同部分的单元节点温度,以此提高混合模拟中数值子结构的计算精度。结果表明:该方法可以实现根据试验子结构的数据更新模型温度场并且进行结构抗火分析,计算得到的耐火极限、极限应力状态与整体结构模拟较为吻合,耐火极限时间误差为7%,极限状态应力误差为1%。因此,文中所提方法较为可靠,能够为进一步提高结构抗火混合试验方法的适用性提供参考。In order to improve the accuracy of the numerical substructure in the hybrid simulation of fire resistance,combined with the model updating technology,the hybrid simulation of fire resistance based on temperature field updating is carried out.A two stories and two spans steel frame model under fire is established to identify the measured temperature parameters in the experimental substructure.The element node temperature of the same part of the numerical substructure is updated to improve the calculation accuracy of the numerical substructure in the hybrid simulation.The results show that the method can update the temperature field of the model according to the data of the test substructure and analyze the fire resistance of the structure.The calculated fire resistance limit and ultimate stress state are in good agreement with the overall structure simulation.The error of fire resistance limit time is 7%,and the error of ultimate state stress is 1%.Therefore,the method proposed in this paper is more reliable and can provide a reference for further improving the applicability of the structural fire resistance hybrid test method.

关 键 词：钢框架 结构抗火 混合模拟 模型更新 耐火极限 

分 类 号：TU391[建筑科学—结构工程] TU352.5