Fluid viscous damper in mitigation of structural vibration effect due to underground blast Online publication date: Sat, 31-Jan-2015
by Papiya D. Mondal; Aparna Ghosh; Subrata Chakraborty
International Journal of Materials and Structural Integrity (IJMSI), Vol. 8, No. 4, 2014
Abstract: Blast induced ground vibration, caused by underground explosions, can result in substantial damage to nearby structures. In the present study, an investigation is made on the possible reduction of structural vibration effect due to underground blast by using the fluid viscous damper (FVD). The blast load is modelled by an exponentially decaying function representative of a typical rock blast. The cylindrical pot FVD is considered for which the fractional-derivative Maxwell model is adopted. The dynamic response analysis of the structure-FVD system is performed in the time domain by an equivalent single degree of freedom (SDOF) viscous oscillator approach which is also compared with the response obtained by the discrete Fourier transform (DFT) approach. It is generally observed that the peak structural displacement due to underground blast can be effectively reduced by the FVD while a limited amount of reduction in the peak absolute acceleration of the structure is obtained.
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