SVIBOR - Papers quoted in CC - project code: 2-11-415

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Papers quoted in Current Contents on project 2-11-415


Quoted papers: 3
Other papers: 3
Total: 6


Title: FATIGUE FAILURE DUE TO A RANDOM STRESS PROCESS

Authors:
Diklic, Dea (9682)
Diklic, Dea (9682)
Journal: Stability of Steel Structures,Preliminary Report,International Colloquium
Volume: II.
Year: 1995
Pages: from 369 to 376
Number of references: 1
Language: engleski
Summary: The essential characteristic of earthquake is its irregularity,its random character.Although the time variation of the random vibration cannot be predicted,the probability of a given value being within a certain range is predictable on statistical basis.The problem is that the unlimited ground-motion data in form of accelerograms are not avilable,so the representative stochastic model couldn't be established directly by statistical analysis.For practical purposes artificially generated process must be simple enough,but must possess the same statistical characteristics as a real seismic record and both of them must have the equivalent respone spectra.From this viewpoint the exciting forces are idealised as Gaussian,stationary and ergodic process with an ideally white spectrum of constant density over all frequencies.The building will be designed to resist the whole ensemble of possible time histories,which have in statistical sense the common trait.When the excitation is a stationary,ergodic and normal random process,the respone will be diferent,but also of the same nature. The engineer is able to express the mean square value of the response of the system in terms of displacement,acceleration, stress or he can choose by himself the suitable level of reliability for the certain building or he can predict the fatigue life under random earthquake excitation,while the estimation of extreme value of stress is possible and just the estimation of risk is of a great interest for metal constructions. The purpose of this paper is to illustrate the possibilities of theory of random vibrations in connection with estimation of failure probability.The variable amplitude sevice life is predicted by using an adaption of the Palmgren-Miner damage model to find the damage caused by each stress cycle.The cumulative total of cyclic damage is then used to predict the expected mean time of failure.The results are plotted for diferent values of system damping.
Keywords: Random vibrations,random stress process,fatigue failure,ideal white noise,stationary process,ergodic process


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