Blast-induced vibrations in urban residential buildings

Performance of N-Z systems in the mitigation of underground blast induced vibration of structures

“…In the present study, the BIGM generated typically from an underground explosion is modeled by an exponentially decaying function by following Carvalho and Battista (2003). The blast loading on the structure,…”

“…Thus, the evaluation of the performance of structures under underground blast induced vibration is gaining importance. Constraints on space and cost as well as safety issues have limited the number of experimental investigations on structural response and damage due to blasting, though there are several simulation studies on this, such as by Dowding (1996), Hao and Wu (2001), Carvalho and Battista (2003), Wu and Hao (2005), and Hao and Wu (2005). To protect structures from the effects of underground explosions, various codes and regulations, like DIN 4150 (1984), DOD 6055 (1992, and the NATO (1993), recommend different criteria that were predominantly established from empirical correlations between observed damage and recorded peak velocities during field blast tests.…”

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

“…Moreover, as the epicentral distance in case of blast induced ground motion is much less than that of seismic ground motion, the attenuation and spatial variation of the underground blast action are more significant than that of the latter over the same propagation distance . Various models for such motions are provided by many researchers such as Carvalho and Battista (2003), Hao et al (2002), Hao and Wu (2005), Ma et al (1998) and Lu (2005), among others. Blast induced ground excitations can be generated numerically by the commercial software AUTODYN through its user subroutine function as given by Hao and Wu (2001), Ma et al (2000), Wu and Hao (2005), etc.…”

“…Nonlinear finite element analysis of an RC frame was conducted by Dhakal and Pan (2003) along with a conceptual discussion on structural response to ground shocks due to underground blast. Carvalho and Battista (2003) performed numerical as well as experimental studies on the intensity and characteristics of vibrations induced in an RC residential building due to underground construction blasting. Response of RC frame structures subjected to numerically simulated underground blast induced ground motions was investigated by Hao and Wu (2005), including the effects of spatial variations of blast ground motion and soil-structure interaction on structural response.…”

“…Noting that the fractional derivative model provides an improved ability to describe the damper behaviour over a wide frequency range (Makris and Constantinou, 1991) over the Maxwell model, the same is adopted in the present study. The underground blast induced ground motion considered in the present study corresponds to that generated from a typical construction blast and is obtained by following Carvalho and Battista (2003). For simplicity of the study, a single degree of freedom (SDOF) system structural model is considered.…”