THE REFINED METHOD FOR THE STRENGTH CALCULATIONG OF THE NORMAL SECTION OF THE BENDABLE FERROCONCRETE ELEMENTS INFLUENCED BY THE ELEVATED TEMPERATURES UNDER THE ACTIONS OF THE LOW-CYCLE LOAD.

Abstract

The refined method for the strength calculation of the bendable ferroconcrete  elements influenced bu the elevated temperatures under the actions of the low-cycle loads on the basis of the structurisation of the calculation method aceording to the results of the experimental research of the stress-strain state of these at the short-term heating and the low-cycle loads. 

Existing methodology of experimental research of concrete and reinforced bending concrete elements, dependent upon influence of raised temperatures for temporary and small cyclical loadings were supplemented and perfected. Experimentally established specialties of strong and deformed properties of hard concrete in heated state for temporary and small cyclical loadings. The experimental results and impact of short-term and small cycle loading under elevated temperatures on deformation lauer extreme compressed zone of concrete. Low-cycle load during brief heating has influence on the change of strain in extreme layer of the compressed zone of concrete, was observed at the stages of loading and unloadingIt is established that the deformation of the compressed zone of concrete is elasto-plastic and increases under the influence of temperature under the unilateral short-term and low-cycle loads.        

As the result, the improvements to method of  calculation of reinforced concrete bending elements strength under joint influence of small cycles loadings and raised temperatures. The comparative ahalysis of the theoretical guantities confirms the acceptance of the proposed improvements to this method.