Tepelné namáhání betonářské oceli

Abstract

This bachelor thesis analyzes the mechanical behavior of B500B reinforcing steel exposed to high temperatures ranging from 20 to 1000 °C. The theoretical framework defines the material characteristics of the reinforcement, its production technologies, and the mechanisms of structural degradation of the crystal lattice under thermal loading. Primary attention is paid to standardized tensile testing procedures according to ČSN EN ISO 6892-1 and ČSN EN ISO 6892-2. The experimental part describes the methodology and results of tensile tests performed on high-capacity testing equipment. Based on the measured data, stress-strain diagrams were constructed, and the tensile strength and modulus of elasticity values were determined for individual temperature levels. The results confirm a non-linear decrease in load-bearing capacity, with critical degradation identified above 500 °C. The observed trends are compared with Eurocode reduction factors and interpreted in terms of the fire safety of building structures.