Barabash M. Numerical simulation of the stress-strain state of structures considering life cycle of buildings.

The object of research - building structures at all stages of their life cycle; objective - to present complex of theoretically proven methods for numerical simulation of stress strain state of the structures during stages of their life cycle and based on methods for analysis of structures with account of nonlinear deformation; methods - theoretical methods of structural theory; methods for mathematical simulation of stress strain state of bearing structures; methods of elastic theory and solid mechanics for evaluation of actual stress strain state; numerical methods - finite element method (FEM); methods of mathematical statistics and probability theory for evaluation of results; method of simulation modeling Monte-Carlo; methods of reliability theory to examine safe operation of structure at the stage of erection and maintenance; results - to present methods for simulation and analysis of high-rise buildings and structures with account of actual behaviour of structures at all stages of their life cycle; for the first time: presented and proved scientific aspects that taken together may be qualified as new promising direction for simulation of building structures with account of their 3D behaviour and modifications in stress strain state at every stage of life cycle; new technique for simulation and analysis of buildings with account of actual behaviour of structures at all stages of their life cycle, the technique considers modifications in stress strain state, rheological properties of materials and emergency situations; new method for differential stiffnesses that considers modulus of elasticity and stiffness properties variable along the bar length; for arbitrary section, displacement of gravity centre and angle of pure rotation are considered. New method of 'sequential stiffnesses' simulates modifications in stress strain state in time for RC structures according to rheological properties of reinforced concrete; further developed concepts of numerical simulation of life cycle process: erection, loading with account of crack propagation, behaviour of structure in time with account of rheological properties of materials, adaptability of structures to design loads; introduced in regulations of Ukraine DBN V.2.2-24: 2009 'Design of high-rise civil and residential buildings'. Appendix E. Methods for analysis on progressive collapse; DSTU-H B.26-ХХ: 2014 'Items of cellular concrete of autoclave hardening', DSTU-H B V.2.6-ХХХ: 201Х 'Manual on design of monolithic reinforced concrete buildings and structures'; in software packages LIRA-SAPR, SAPFIR, KALIPSO; in engineering practice in design companies of Ukraine as well as in the countries of near and far abroad