Analysis of structures under fire loading

This study aims to understand the way the members of a structure act while part of the structure is subjected to fire. How many members are high deflected, their situation, and their role on the collapse of the whole building is also in the scope of this study. A finite element analysis program (STAAD PRO v8i) is used to analyze the 3D structure. The temperature is applied to one compartment, and the type of temperatures that to be applied to the members of that compartment are uniform temperature and gradient temperature. Whether the member is exposed to the same rate of the temperature along its length or the rate of the temperature increases gradually along the length of the member, is also considered. The deterioration of the mechanical properties as the temperature increases has a great importance. From the results it is noted that the highest deflection happens in the fired compartment, and only the members of the neighboring compartments of the fired compartment have a considerable deflection to be mentioned, especially in the floors higher than the fired compartment.Key words: Multi structure; temperature analysis; thermal loading