Mandal, S.K
(2009)
Distance of Structure causes amplification or reduction in vibration magnitude with an increase in height of measurement.
Journal of Mines, Metals & Fuels, 57 (10).
pp. 327-334.
ISSN 0022-2755
Abstract
Seismic energy generated due to detonation of explosive causes environmental degradation and give rise to socio-environmental complaints. Based on frequency of vibration and amplification in vibration magnitude with an increase in height of measurement on a structure, vibration magnitude i.e., ppv, measured near the foundation of structure has been considered as the main parameter for safety of structures. The paper, here, discusses about anomaly to general observation i.e., instead of amplification, reduction in ppv with an increase in height of measurement on a structure. The paper, with the help of vector analyses has also attempted to justify that distance of structure from the place of blasting, magnitude of each component and the component triggering the structure of vibration plays an important role for such occurrence. The paper communicates that when longitudinal wave component triggers the structure to vibrate, amplification in vibration magnitude is observed with an increase in height of measurement. On the contrary, when vertical or transverse component triggers the structure to vibrate, attenuation in vibration magnitude is observed with an increase in height of measurement. The paper, lastly, communicates that in addition to limiting vibration magnitude for safety of structures, quantum of energy transmitted to the structure in accordance with strength properties of the structure should be analyzed to ascertain safe vibration limit for structures
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