Critical temperature of regular pyramidic space truss in non-uniform fire temperature field

To ensure fire safety design for grid roof structures of large space buildings,the whole process response of regular pyramidic space truss is analyzed by nonlinear infinite element method to calculate different structural schemes.A series of critical temperatures are used to evaluate the fire performance for regular pyramidic space trusses on non-uniform fire temperature fields.The parameters for determining the critical temperatures,structure loading ratio and the coefficient for describing the non-uniform fire temperature field were considered as the key parameters.Fitting the relation of the critical temperature with key parameters by least square method,the practical equation for determining the critical temperature of regular pyramidic space trusses can be obtained.The calculated example shows that the practical equation can calculate the critical temperature for regular pyramidic space trusses.