Vibration analysis on large-scale drainage pumping station

摘要

An FEM model was established for analyzing the vibratory propagation characteristics of large scale pumping stations, whose structures arc in the majority of cases made of concrete. Vibration analysis of a station, which was 98 meters in length.)meters in width and 34 meters in height, was carried out in a frequency range of 0-100 Hz. Analysis results were compared with those of measurements and they showed good agreement. Furthermore, factors affecting the accuracy of analysis were investigatedand the results are as the following : (1) Vibration responses at locations nearby the excitation source could be estimated by analyzing neighboring portions of the structure, (2) Spring constants of thc ground had influence only on a low frequency range, and (3) Damping ratios were frequency dependent, having great influence on responses at locations away from the excitation source.