Abstract: The fire resistance rating of fire door depends on its fire insulation and fire integrity. The fire insulation of the steel fire door are related to the thermal conductivity of the door core material and the thickness of the door leaf, while the fire integrity is mostly related to the structure of the fire door. Unreasonable arrangement of stiffeners, hinges and other structures of the fire door will lead to excessive deformation of the door leaf and loss of fire integrity of the fire door. By analyzing the fire resistance of fire door through finite element method and optimizing the setting of stiffener and hinge, the deformation of fire door leaf can be reduced and the fire resistance of fire door can be improved.

Key words: fire protection, fire door；fire resistance；finite element analysis