Bearing strength of constructions of building and building with steel framework at high temperature influences

Abstract

Purpose. Development of measures for providing of load-bearing capacity of steel structures of building and building at the action of power and high temperature factors, renewal of term of exploitation or necessity of change of fireproof measures opti on. Method. The analysis of the state of capital assets, technical equipment of the systems of life-support in Ukraine and emergencies which took place on them lately, testifies to their critical condition. For further safe exploitation of building and building with   steel framework it is necessary to conduct permanent diagnostics of constructions, determine the controlled parameters of constructions (d escriptions of durability and deformability of materials, bending and moving of constructions), develop the methods of calcula tion and methods of defence of constructions in accordance with the requirements of operating normative documents, including, from temperature influences.Methodical approaches are expounded in relation to the calculation of steel constructions on temperature influences. For the heating engineering calculation of separate construction take into account the location of project fire in relation to th is construction.  Results.  As development of fire results in the uneven heating, decline of descriptions of materials and destruction of load carrying structures, wall protection, warehoused properties and equipment, it is necessary to set the law of measuring of Physical and mechanical properties of materials of constructions by the corresponding alpha tests of standards of metal at heating to the different temperatures.  Scientific novelty.  Resulted suggestion in relation to determination of calculation bearing strength of steel constructions at the united action of power and temperature factors, given suggestion on the ground of possi bility of their further exploitation. The calculations of constructions must be conducted taking into account the changing at heating deformed state and Physical and mechanical properties of materials of elements of constructions.  Practical meaningfulness.  The offered methodology allows to decide next tasks: to work out the complex of associate measures in relation to determination of parameters of the tensely-deformed state at the united action of power and temperature factors; to set the sizes of parameters and criteria of the technical state of steel constructions, building and building on the whole on results calculations; to work out models and methods of calculation of t he tensely-deformed state which arises up during development of fire.