ВОГНЕСТІЙКІСТЬ БУДІВЕЛЬ ІЗ ВРАХУВАННЯМ ЗМІНИ НАПРУЖЕНОГО СТАНУ БУДІВЕЛЬНИХ КОНСТРУКЦІЙ ПІД ЧАС ПОЖЕЖІ

Abstract

Тhe analysis of the state of the issue of fire resistance of frame buildings taking into account the change of stress state of
structures during fire, the experimental base of tests of natural fragments of buildings, the analysis of test results of
natural fragments of buildings, the influence of joint work of building structures on stress change buildings, change of fire resistance of elements of a framework and the building as a whole. The results of tests of natural fragments of buildings in Cardington are presented, concerning the redistribution of stresses at the joints of structures, changes in the static scheme of floor slabs, and their influence on the behavior of columns of frame structures during fire. The reasons for the increase of bearing moments in inseparable structures and the forces arising from the compression of thermal expansion of structures during a fire are considered. A comparative evaluation of the behavior of twospan floor slabs, depending on the method of their reinforcement.