Babik K. Seismic safety assessment for buildings, structures and constructions with using of risk theory

Task on development of engineer technique for assessment of buildings, structures and constructions safety under seismic loads is realizing in thesis. Assessment of structural risk is a key moment for rational design of new structures and estimation of existing buildings and structures seismic resistance. Analysis of destructive earthquakes and experimental researches shows that such assessment should be carry out with using of calculation accelerograms for seismic influences taking into consideration the structures spatial work with distributed or concentrated mass, features of structure nonlinear deformation, interaction of upper structure with base. That task decision by nonlinear dynamic calculation for multi degree of freedom spatial system with alone solution is very laborious and it is not realise by any known calculation method. Engineer technique is proposed in scientific work. It permits to execute the dynamic calculations on building structures under accelerograms influence and to estimate risks on structures failure taking into consideration a nonlinear materials work. Maiden proposals are based on statements of simplified procedures (e.g. by Z. Freeman, Canada) foreseeing a dynamic calculation of single degree of freedom system a nonlinear reaction of which likes to nonlinear reaction of multi degree of freedom system at intensive seismic influence. Proposed technique permits to get parameters of nonlinear seismic reaction in design as well as existing buildings, structures and constructions at influence of calculation accelerograms. Way for taking into account of higher forms of oscillations is presented for calculation of high-rise buildings. Key words: seismic safety, multi degree of freedom spatial system, calculation accelerogram, nonlinear reaction, system-analogue, structural risk, higher oscillation forms, calculation model, program complex, dynamic certification.