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This research paper discusses the problem of the strain state formation in the bearing system through its lifespan. It is demonstrated that in the general case the seismic events (being quite rare natural acts) can impact the structures which, by the time an earthquake hits, will experience strains developed during the period preceding the earthquake. Consequently, the accurate seismic load calculation for the bearing system in view of the seismic events shall account for the strain state developed in the structures prior to the seismic event. Analysis of the customary computational techniques used in seismic load calculations for bearing systems and employing the response spectrum method reveals, that in the context of a single-stage calculation method it is possible to introduce only one model of external relations that corresponds to either the long-term loading effect or to the short-term seismic loads. Such approach is not aligned with the true-life pattern of external relations, which is subject to changes through the life span. For the purposes of accurate prediction of seismic response in buildings, it is proposed to use a multistage calculation method with the stage-to-stage inheritance of the stress-strain state. At that, at any stage it is possible to modify the properties of external relations. Compared are the calculation results of the seismic impact test model employing the customary calculation techniques and the multistage calculation method with adjustment of the external relations model to correspond with the lifespan mode. The outcome of the research proves that the use of the customary single-stage calculation method leads to significant simplification of the bearing system strain model, as well as to inaccuracy of the seismic response prediction result. Based on the research outcome, the single-stage calculation method is advised. It permits to take into account developments in the external relations model through the building lifespan.

Determination seismic effect of buildings and structures, taking into account changes model of external relations within the life cycle