FIRST EXCURSION PROBABILITY AND PEAK RESPONSE OF A SHEAR BEAM UNDER HIGH FREQUENCY SEISMIC EFFECTS

Abstract eng:
In present paper selected results of a study of non-stationary random vibrations of a shear beam excited by time segments of band limited white noise are presented. The root mean square (rms) and peak response of the shear beam is studied for two characteristic frequency bands: the conventional 1-4Hz and higher frequency 4-16Hz, characteristic for rockburst ground motion. The “switching off” fundamental modes for high frequency excitations results in characteristic overshoot of the stationary response level by the non-stationary rms response and an amplification of the response in the upper part of the shear beam.

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