PROVIDING OF FIRE-RESISTANCE OF THE EXPLOITED STEEL CONSTRUCTIONS

Abstract

The  modern state of the question  is generalized, the tasks of researches are put, 
basic pre-conditions of application of defence of on-the-road steel build constructions are marked 
from  high  temperature  influences.  The  review  of  results  of  researches  of  different  aspects  of 
defence  of  constructions  is  resulted,  determinations  of  the  technical  state  in  the  process  of 
exploitation  after  different  influences  and  its  adjusting  by  repair,  strengthening  or  replacement. 
Works of the known scientists in this area, in which positions of theory of calculation of building 
constructions  are  expounded  taking  into  account  high  temperature  influences,  are  analysed.  The 
analysis of existent methods allowed to set that the methods of calculation of steel constructions, 
estimations of their technical state and ground of possibility of subsequent reliable exploitation of 
constructions of buildings and buildings, taken to the practical use absent after different influences.  
Procedure of planning, device and estimation of fire-resistance of steel constructions  in the 
process of exploitation is offered.  
The method of research of the technical state of steel constructions, damaged as a result of fire 
is  resulted.  During  implementation  of  works  a  hearth  and  reasons  of  fire,  size  of  maximal 
temperature at a fire, areas of thermal damages, is set, duration of heating in the different areas of 
fire etc. On the basis of findings a conclusion prepares about the technical state of constructions and 
possibility or impossibility of proceeding in their service ability.  
In accordance with requirements it is recommended to determine the criteria of estimation of 
the  technical  state  and  fire-resistance  of  material  and  constructions  a  project  and  normative 
document on the whole.  
The method of receipt of determining parameters of the technical state and fire-resistance of 
steel constructions is developed and approved. It is foreseen, that constructions and elements during 
all of life cycle as a result of senescence, degradation and other influences can consistently be in 
each of four technical states.  
The  results  of  estimation  of  the  technical  state  and  fire-resistance  of  constructions  of  the 
buildings, which got damage as a result of exploitation of both fire and measure on adjusting of the 
technical state and fire-resistance of constructions are presented.