By M.R. Willford, P. Young
ISBN-10: 1904482295
ISBN-13: 9781904482291
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Extra info for A Design Guide for Footfall Induced Vibration of Structures
Example text
14) 4. 7. e. T is smaller), which increases the overall RMS response. The relationship between vRMS and footfall rate is therefore not quite linear, having an exponent slightly greater than 1. To calculate the maximum possible response, it is only necessary to calculate the response at the fastest walking speed. 7 Graph of impulsive response versus footfall rate. 4 Simplified and approximate methods for floors Whilst the detailed methods of the previous sections enable responses to be predicted for any structure, simplified methods are included below for certain regular rectangular floor bays of uniform properties which can be approximated reasonably well as simply supported plates having equal or different stiffnesses in the two orthogonal directions.
The modal mass of each mode derived by the rectangular plate calculation is one quarter of the total mass. 55. 16 First four mode shapes of the floor. A finite element model of the floor was constructed including the back span and the columns. 16. It can be seen that the natural frequencies from the FE analysis are slightly higher than from the rectangular plate calculation. This is due to the influence of the back span and the inclusion of the columns in the analysis. The measured frequency of the first mode is slightly higher than that predicted by the FE analysis.
UNGAR, E. , Floor Vibration Due to Human Activity, AISC Design Guide Series No. 11, 1997. 2 WYATT, T. , Design Guide on the Vibration of Floors, Steel Construction Institute Publication 076, London, 1989. 3 BS 5400: Part 2 (1978) Appendix C Vibration Serviceability Requirements for Foot and Cycle Track Bridges. 4 GORDON, C. , The Control of Vibration in Buildings, BBN Laboratories, 1988. 5 GORDON, C. , Generic Vibration Criteria for Vibration-Sensitive Equipment, SPIE Conference, 1999. , YOUNG, P.
A Design Guide for Footfall Induced Vibration of Structures by M.R. Willford, P. Young
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