Abstract
The emergency situations and catastrophes with buildings and structures may be caused by both the short-time loads considerably exceeding the design load values and the cyclic loads exciting the fatigue damage in the structure material. The cyclic influence is characterized by the amplitude, the cycle asymmetry and the number of loading cycles. To reveal all the factors of a cyclic influence is possible by the on-line measurement of stresses or that of strains at the structure under observation.
Highlights
This work describes a methodology of processing of observations of the strains in longspan dome structures
The analysis of the data obtained proved that the determination of fatigue damage in the structures requires the consideration of all swing groups
One of the problems described in this study is the problem of study of the influence of the stress swing value in the loading cycles on the accumulation of fatigue damage
Summary
This work describes a methodology of processing of observations of the strains in longspan dome structures. The authors used different information processing methods including some one-parameter methods (extreme methods, maximum methods, consolidated swing methods) and a two-parameter method considering the cycle amplitude and the average cycle stress. The number of loading cycles as well as the degree of fatigue damage has been determined. The analysis of the data obtained proved that the determination of fatigue damage in the structures requires the consideration of all swing groups. The consideration of only maximum swing groups leads to nearly double underestimation of the degree of accumulated damage. The authors estimated that the degree of accumulation of fatigue damage may achieve its ultimate value for the design maintenance period of the structure concerned equal to 50 years
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