Fluid viscous damper in mitigation of structural vibration effect due to underground blast

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 fractionalderivative 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.Keywords: blast induced ground motion; cylindrical pot fluid viscous damper; fractional derivative Maxwell model.Reference to this paper should be made as follows: Mondal, P.D., Ghosh, A. and Chakraborty, S. (2014) 'Fluid viscous damper in mitigation of structural vibration effect due to underground blast', Int.

Performance assessment of an earthquake-based optimally designed fluid viscous damper under blast loading

“…Miyamoto and Taylor (2000) evaluated the effectiveness of an FVD under blast loading and demonstrated that structures equipped with an FVD provide an effective way to control the blast response of the structure. Mondal et al (2014) showed the effectiveness of an FVD in reducing peak structural displacement under underground explosions. These researches have been focused on only the blast performance of the FVD when this control system is originally employed for controlling the structures under seismic loading and its seismic performance should also be evaluated.…”

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