Abstract
This paper examines the issue of mathematical modelling of local destruction processes of flat reinforced concrete structures beyond design basis impacts. Analysis of the peculiarities of the local failure mechanisms, which are formed in wall concrete structures, was conducted. The paper shows that the processes of post-critical deformation of flat concrete structures occur through several mechanisms with the relevant strength criteria. The method of post-critical deformation modelling of reinforced concrete structures under biaxial stresses is proposed and justified. The modelling is conducted by the gradual change of the analysis model in the areas of failure using finite elements with stiffness parameters, which corresponds to the conditions of interaction between structure parts separated by a crack.
Highlights
The prediction of load-carrying building systems stress-strain state within the framework of project impacts is a standard procedure of engineering analysis and has a set of welldeveloped techniques based on the numerical methods
* Corresponding authors: ovk531@gmail.com, bozidarm@rambler.ru and the formation of main structural damage zones. Such disruptions can lead to two cases: to an increase in the volume of destruction in the building load-carrying system with the transition to global destruction of the system or to the localization of damages in the destruction zone without the spreading of destruction process in the load-carrying structure system
For stone structures under biaxial stressed state, the processes of post-critical deformation were investigated in [11, 12].According to the research results, it is established that several mechanisms of local destruction are formed, which have a mutual influence on the development of any of them
Summary
The prediction of load-carrying building systems stress-strain state within the framework of project impacts is a standard procedure of engineering analysis and has a set of welldeveloped techniques based on the numerical methods. The account of post-critical deformation of the structure allows to consider the decrease in the volume of elastic energy of the building load-carrying system in the formation process of inelastic deformations (local and main destructions).
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