Fire Performance Analysis Of Partial Encaed Concrete (PEC) Columns And Steel Beam Composite Frame Under Local Fire

As a kind of indeterminate structure,the interaction between the building components is strong,which leads to internal force redistribution after fire exposure.The paper is based on the integrality structure which can precisely respond the performance of the frame under fire.Civil buildings always have clear boundaries which can limit the fire spread to other space.So far,the fire performance analysis of composite frame under local fire has not been reported.In this paper,steel-concrete composite plane frame under local fire was used as an example,failure mode,fire resistance,deformation of beams and columns of the plane frame were studied.The main contents of this thesis can be summarized as follows:1.By using ABAQUS software,after determing the material parameters of concrete and steel,3-D finite element model was established to calculate the temperature field distribution and the fire resistance behavior of PEC columns,composite beam-column joints,composite plane frame under local fire condition,which was validated by some test data.2.Two steel-concrete composite plane frame model was established and ABAQUS was used to investigate two failure modes of the plane frame under local fire in different condition.3.Under column failure mode,fire resistance of the plane frame,deformation of beams and columns,and internal force at column base were studied.4.Under beam failure mode,fire resistance of the plane frame,deformation of beams and columns,and internal force at column base were studied.