SVIBOR - Project code: 2-11-415

MINISTRY OF SCIENCE AND TECHNOLOGY

Strossmayerov trg 4, HR - 10000 ZAGREB
tel.: +385 1 459 44 44, fax: +385 1 459 44 69
E-mail: ured@znanost.hr

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Project code: 2-11-415

Applications of Random Noise Theory to Earthquake Engineering

Main researcher: DIKLIĆ, DEA (9682)

Assistants

JECIĆ, ZDENKO (900596)

Type of research: applied
Duration from: 01/01/91. to 12/31/93.

Papers on project (total): 6
Papers on project quoted in Current Contents: 3

Institution name: Arhitektonski fakultet, Zagreb (54)
Department/Institute: Department for Applied Mechanics
Address: Kačićeva 26
City: 10000 - Zagreb, Croatia

Communication: Phone: 385 (0)1 323332 ku†a; Phone: 385 (0)4561 246 fakultet; Fax: 385 (0)1 442024

Summary: It is shown that if the stress is a stationary narrow band Gaussian random process,then the peaks have the Rayleigh distribution.The variable-amplitude service life is predicted by using an adaptation of the Palmgren-Miner damage model to find the damage caused by each stresss-cycle.The cumulativ total of all cyclic damages is then used to predict the expected mean time to failure.The results are ploted for different values of system damping.Numerical examples are given to illustrate the simplicity and accuracy of the approach method.

Keywords: random vibrations,random stress process,fatigue failure,ideal white noise,stationary process,ergodic process

Research goals: A random vibration is one whose instantaneous value is notpredictable. 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.At moment I am interested in random vibrations largely because of its ability to cause failure! When the stress is a stationary narrow-band Gaussian random process,the problem of predicting fatigue failure becomes very difficult.The theory of fatigue of metals is far from complete although the general outlines seem to be well establised. The method is presented by which the safety of the building against earthquake can be estimated in terms of the probability of failure.The results of analysis are programmed for numerical evaluation of the inputs.The analysis of this type may be usefully employed for the economic design of tall buildings,of nuclear power industry and many other vital and complex engineering systems.This statistical display of structural response gives engineers more confidence in designing the structure then the deterministic manner.

OTHER ACHIEVEMENTS

Name: Prijevod knjige autora: Salvadori,Heller:Structure in Architecture,The Bilding of Buildings.Knjiga je odobrena kao Sveučilišni udžbenik, nalazi se u tisku, očekujem izdanje tokom listopada 1995.
Type of achievement: Teaching aids and educatio
Authors: Prof.dr.Dea Diklić,dipl.ing.

Other information about the project.


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