Internal force redistribution of a reinforced concrete beam-supporting column transfer structure in fire

Abstract

By use the ABAQUS software, the internal force redistribution law are analyzed. The research result shows that the internal force redistribution of the transfer structure at high temperature starts from the thermal expansion of the members directly exposed to fire, and transfers from the high temperature area to the normal temperature area under the interaction between the members. The changes of internal forces of structural members are mainly manifested as follows: The beam section produces obvious pressure or tension; The bending moment of beam and column members in high temperature zone changes obviously and the direction may change; The internal forces of beam and column members that not directly affected by the high temperature will change to varying degrees under the interaction between the members.