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A numerical study on fire endurance of wood beams exposed to three-side fire

查看全文 作　　者：Jin ZHANG 1, Qing-feng XU2, Yi-xiang XU3, Bin WANG1, Jing-xiang SHANG1 (1Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University, Nanjing 210096, China) (2Shanghai Key Laboratory of New Technology Research on Engineering Structure, Shanghai Research Institute of Building Sciences, Shanghai 200032, China) (3Department of Civil Engineering, Strathclyde University, Glasgow G12 8QQ, UK) 高影响力作者 出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》索引2012年第13卷第7期,共15页高影响力期刊 基　　金：Project supported by the National Natural Science Foundation of China (No. 51178115);the Priority Academic Program Development of Jiangsu Higher Education Institutions;the Shanghai Rising-Star Program (Nos. 11QH1402100 and 07QB14031), China 摘　　要：To investigate the fire endurance of wood beams exposed to three-side fire, we conducted bearing capacity tests of two wood beams and experiments of five wood beams exposed to three-side fire. The finite element software ANSYS was also used to predict the fire endurance of those beams with the indirect order coupling method. It was found that the fire endurance decreases as the load level increases, and the reduction ratio tends to decrease. In the case of a certain load level, the fire endurance is improved if the section size is increased or covered by the fire protection coating. The central deformation increases as the fire duration increases, and the ratio of increase tends to rise. On another note, an increase in the density of wood leads to a rise in the fire endurance of a given beam. From the finite element method (FEM) calculation results, the fire endurance decreases as the load level increases, and the reduction ratio tends to decrease. When the load level is greater than 0.5, the fire endurance is significantly reduced, and it does not change significantly when the load level changes. Lastly, for a load level magnitude below 0.5, the fire endurance and load level are proportional to one another. 关 键 词：Three-side fire Fire endurance Load level Fire prevention measures Finite element analysis Density of wood
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