Abstract：The accidents of firefighter casualties caused by the fire-induced collapse of steel structures are frequent in recent years. It is urgent to carry out research on the early-warning method for building collapse under fire. Studies have shown that the collapse prediction of steel portal frames under fire can be achieved by measuring the micro deformation of the eaves and apex of the frame. However, the measurement technology of displacement under real fire still needs to be explored due to high temperature and hot smoke. This paper investigated the feasibility of InSAR Radar technology in the displacement measurement under fire through a test. A fire test was conducted on a scaled steel portal frame structure model, and the thermal and displacement responses of key points of the frame were measured by the Radar-based displacement measuring system. By comparing with the results of traditional guyed displacement meter, the effectiveness and veracity of the radar-based displacement measuring system for structural displacement test in fire were verified. A numerical model was established to simulate the fire performance of the test frame in ABAQUS. The analysis results indicate that the three-dimensional model considering the actions of secondary members can accurately simulate the collapse process of the steel portal frame in fire.
李国强 吉蔚 冯程远 王尧 李鑫杰 梁涛 石晓亮 刘潇. 火灾下门式钢刚架倒塌试验与雷达位移测试系统有效性研究[J]. 土木工程学报, 2021, 54(9): 56-65.
Li Guoqiang Ji Wei Feng Chengyuan Wang Yao Li Xinjie Liang Tao Shi Xiaoliang Liu Xiao. Collapse test of steel portal frame under fire and effective analysis of radar-based displacement measuring system. 土木工程学报, 2021, 54(9): 56-65.
