Time Dependent Stochastic Characteristics of the Lateral Random Vibration of Tall Structures with Circular Cross-Sectionby R. J. Scherer, Univ of Karlsruhe, Germany,
H. Keβler, Univ of Karlsruhe, Germany,
Abstract: From full scale measurement of the pressure field at three levels of a concrete chimney with 230 m height the lift coefficient is deduced and the lateral oscillation is investigated. The influence of vortex shedding on the lateral excitation is of special interest and the stochastic characteristics of the vortex shedding process are analysed. As a preliminary result it is found that the shedding process is a time dependent stochastic process with a remarkably high correlation in the vertical direction. The shedding frequency is very stable in certain time intervals and changes suddenly from interval to interval. It is suggested to model these intervals by a Poisson process and to take the shedding frequency to be independently normal distributed. During each interval the usually used assumption of a narrow banded stationary process is adequate.
Subject Headings: Stationary processes | Vortex shedding | Time dependence | Wind power | Field tests | Chimneys | Oscillations
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