Abstract
Fire as one of the extraordinary load is essential to study in all its aspects. It evolve to study the fire development as well as the structural analysis of elements subjected to the fire. The present paper deals with steel beam fire resistance determination by these two approaches (analytical and numerical) and compares the results.
Highlights
The difference in structure loading by fire depends on the different phases of the fire that we recognize
Simplified fire models are sufficient for general practice but they are limited in size of the fire sections, in size of the fire load and distribution of thermal energy
The simplest fire models are nominal temperature curves indicating of dependence gas temperature on time in the fire section
Summary
The difference in structure loading by fire depends on the different phases of the fire that we recognize. In the first phase of the fire (pre-flashover) the temperature remains relatively low and the structural elements are not more stressed by temperature. The temperature rises rapidly, the second phase of fire (flesh over) occurs and the temperature load on the structure is extreme. Simplified fire models are sufficient for general practice but they are limited in size of the fire sections, in size of the fire load and distribution of thermal energy. Improved models consider more exact thermal and temperature distribution in fire section [9]. The simplest fire models are nominal temperature curves indicating of dependence gas temperature on time in the fire section. Nominal temperature curve (Fig. 2) indicates fire section temperature dependence only on time of fire [8]. When θθtt is gas temperature in relevant fire section [°C] and t is time [min]
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