Fire Safety Science Digital Archive

The present paper indicates finite element models which are capable of pursuing behaviors of high strength bolted beam-beam rigid joints and overall steel frames subject to fire. The finite element analysis takes into account thermal expansions and nonlinear stress-strain relationships of heated materials, and geometrical nonlinearities due to finite deformation. The beam joints in the finite element models consist of 3D H-sectional models assembled by flange plates, web plate and splice plates which are 2D rectangular elements. A gap between the splice plate and the beam is connected with a bolt element which has an elasto-plastic shear spring. The bolt elements have relationships between shear stresses and shear deformations for JIS F10T under various member temperatures. Further, a typical collapse mode of a steel frame with beam joints is clarified with the above finite element analysis