Mechanical Response under Natural Fire of Barrel Shape Shell Structure

摘要

In this paper, thermo-mechanical analysis of the structural shell construction exposed to natural fire is presented. A barrel shape coverlet with dimensions of 40m x 80m is a roof system covers the shopping arcade. The braced shell structure is made of steel rectangular hollow sections. The steel construction is a support for a special glass system. Behaviour of structure under natural fire conditions is considered as the main goal of research. Fire is simulated with the use of FDS software. Then, adiabatic surface temperatures are transferred into the non-linear Abaqus finite element analysis as boundary conditions for thermo-mechanical analysis. The 3D geometry FE computational model is prepared using 3D beam finite elements with mechanical and thermal degrees of freedom. CFD and FE analyses are sequentially coupled using special individually designed scripts. The analyses show influence of natural fire on the structural behaviour of the roof.