建筑结构学报2026，Vol.47Issue(6)：37-49,13.DOI:10.14006/j.jzjgxb.2026.0033
火灾下弦支穹顶结构热力学响应试验研究
Experimental study on thermodynamic response of suspendome structures under fire conditions
摘要
Abstract
To investigate the mechanical responses of large-space structures under fire conditions,a 1/5-scale suspendome model with a span of 12 m and a height of 2 m was designed and constructed to perform fire tests under varying fire source powers and ventilation conditions.The objectives were to characterize the air temperature field,the temperature distributions of components,and the mechanical response during fire.The experimental results demonstrate that the internal air temperature field exhibits pronounced spatial non-uniformity under fire conditions.As the fire source power increases from 143.20 kW to 358.00 kW and the opening factor decreases from 0.14 m1/2 to 0.04 m1/2,the maximum internal air temperature rises from 67.30℃to 183.92℃,with an increase of approximately 173.28%.Under a fire source power of 358.00 kW,the maximum structural deformation does not exceed 6 mm,remaining within the elastic range and below the displacement limit specified in JGJ 7-2010'Technical specification for space frame structures',indicating a high overall stability.Under fire conditions,all hoop cables of the suspendome structure relax due to thermal expansion,resulting in a decrease in prestress of 1.30%to 48.11%.The outer hoop cables show the highest rate of prestress reduction,while the inner hoop cables experience a smaller rate of reduction.The FDS field simulation method can effectively calculate the air temperature inside the structure under fire conditions,and the finite element analysis model can effectively predict the structural response under fire conditions.关键词
弦支穹顶/受火试验/热力耦合/场模拟/结构响应Key words
suspendome structure/fire experiment/thermal coupling/field simulation/structural response分类
建筑与水利引用本文复制引用
刘红波,赵建雄,郭刘潞,孟湘凯,赵子豪..火灾下弦支穹顶结构热力学响应试验研究[J].建筑结构学报,2026,47(6):37-49,13.基金项目
国家自然科学基金青年科学基金项目(52308191),河北省青年科学基金D类项目(E2025402005). （52308191）
