Numerical study of thermal-mechanical behavior of 2D composite steel-concrete frames
Palavras-chave:
composite frames, fire situation, thermal-structural analysis, CS-ASA, RPHM/MCD couplingResumo
The purpose of this study is to apply the advanced numerical methodology developed and implemented
in the CS-ASA/FA (Computational System for Advanced Structural Analysis/Fire Analysis) and CS-ASA/FSA
(Fire Structural Analysis) to understand the thermal-mechanical behavior of 2D composite steel-concrete frames
in fire situation. The analysis is carried out on two-level approaches, the first referring to the structural element
cross-section. In this step, the temperature field is calculated using a transient heat transfer model, from where the
degradation of stiffness and strength parameters are obtained when the materials are exposed to fire. The second-
level stage is related to inelastic second order analysis (ISOA) of the composite steel-concrete structural system
under high temperatures. In the ISOA context via finite element method (FEM), a co-rotational formulation is used
to follow the large displacements and rotations of the structural model, and the material elasto-plastic behavior is
simulated through the Refined Plastic Hinge Method (RPHM) and Strain Compatibility Method (SCM) coupling.
Finally, the structural modeling studied seeks to validate the proposed numerical strategy using the results found
in literature.
