Experimental, numerical and analytical analysis of a single-span steel portal frame exposed to fire

被引:5
|
作者
Lou, Guo-Biao [1 ]
Hou, Jing [1 ]
Qi, Hong-Hui [1 ]
Jiang, Yaqiang [2 ,3 ,4 ]
Zhong, Bo [2 ,3 ,4 ]
Pang, Yansong [1 ]
Li, Guo-Qiang [1 ]
机构
[1] Tongji Univ, Coll Civil Engn, Shanghai 200092, Peoples R China
[2] Minist Emergency Management, Sichuan Fire Res Inst, Chengdu 610036, Peoples R China
[3] Minist Emergency Management, Key Lab Fire Protect & Retardant Technol, Chengdu 610036, Peoples R China
[4] Natl Engn Res Ctr Fire & Emergency Rescue, Chengdu 610036, Peoples R China
基金
中国国家自然科学基金;
关键词
Steel portal frame; Fire; Numerical analysis; Thermo-mechanical behaviour theory; Thermo-mechanical behaviour stage; STRUCTURAL BEHAVIOR; CATENARY ACTION; BEAMS; PERFORMANCE;
D O I
10.1016/j.engstruct.2023.117417
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
The thermo-mechanical behaviour of single-span steel portal frames in fire conditions illustrates a sequential transition from an ambient temperature state through to eventual collapse, encompassing axial forces, moments and deformations. To investigate the thermo-mechanical behaviour, a fire test on an 8 m x 6 m steel portal frame assembly is conducted. Detailed thermal and structural responses of the frame are measured and presented. The experimental results reveal that the frame collapses post 31-min heating with a peak temperature approximating 800 degrees C. A typical inward collapse mode is observed. 2D and 3D finite element models are established and validated against experimental results, respectively. The numerical model is divided into three heating regions to mimic the behaviour exhibited during the fire scenario. Furthermore, a thermo-mechanical theory is proposed to analyse the fire behaviour of a single-span steel portal frame. Based on the fire response of a restrained steel beam, the thermo-mechanical behaviour can be segmented into four stages: the ambient temperature stage, thermal expansion stage, elasto-plastic stage and catenary stage. A comprehensive series of calculation formulas determine the displacement, internal forces and moments at different stages. The analytical computations exhibit a close consistence with the numerical results, within the deviation of 10% for the majority. This analytical method can be effortlessly employed for both the fire-resistant design and assessment of the current state of steel portal frames in fire conditions.
引用
收藏
页数:17
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