| Abstract: | This paper considers the problem of random vibrations and the reliability of slender tower-shaped structures subjected to seismic excitations. Applying the concept of evolutionary spectra and the uniformly modulated random process as a model of strong ground motion, the response statistics are derived. Peak response values and reliability are then estimated. Results are related to Modified Mercalli and Arias intensities. With the aid of the Fast Fourier Transform technique a numerical analysis of peak response and reliability of a high-rise reinforced concrete chimney has been carried out. Results indicate the location of seismic failures in the upper half of the shaft of the chimney. Finally, the paper briefly examines the influence of strong motion duration on the peak response and reliability. |
