PROPERTIES ON THE BEHAVIOUR OF STEEL-REINFORCED CONCRETE STRUCTURES

Abstract

This review-analytical study examines how the thermophysical properties of concrete and steel influence the behavior of steel-reinforced concrete structures under climatic and fire-induced temperature actions. The aim is to systematize the main mechanisms of temperature-induced stresses and deformations and assess their effect on composite action. The methodology includes analysis, classification, comparison, and synthesis of published analytical, experimental, and numerical studies, supported by illustrative calculations of axial stresses, bending moments from temperature gradients, and shear forces in connectors. The results show that differences in thermal expansion, conductivity, and heat capacity generate self-equilibrated stresses, redistribute internal forces, reduce stiffness, and may decrease load-bearing capacity, especially in statically indeterminate systems and under fire. The scientific novelty lies in integrating these mechanisms within a unified interpretation and highlighting the governing role of shear connectors. The findings can support more reliable design models, while further research should refine predictive methods and expand experimental validation.