Fluid viscous damper in mitigation of structural vibration effect due to underground blast. (27th January 2015)

• Record Type: Journal Article
• Authors: Mondal, Papiya D.; Ghosh, Aparna; Chakraborty, Subrata
• Is Part Of: International journal of materials and structural integrity. Volume 8:Number 4(2014)
• Page Start: 273
• Page End: 290
• Publication Date: 2015-01-27
• Subjects: blast induced ground motion -- cylindrical pot fluid viscous damper -- fractional derivative Maxwell model; Materials -- Testing -- Periodicals; Strength of materials -- Periodicals; Structural dynamics -- Periodicals; Structural analysis (Engineering) -- Periodicals; 620.112
• Languages: English
• ISSNs: 1745-0055

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.