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STRUCTURE
RESPONSE
The response of structures to blasting vibrations is characterized in term of relative cracking potential. Special wall-mounted sensors record vibratory motions of the gross structure, mid-walls, and existing wall cracks. Blast-induced wall motions are compared with other normal vibrations such as those generated by wind forces and human activities. Differential wall displacement time histories are employed to compute wall trains and compared with strains required to crack wall structure materials and other construction components. Crack motions sensors are used to compare blast-induced opening and closing of an existing wall crack with the static, weather induced crack movement from variations in temperature and humidity as well as with dynamic forces of wind and normal household activities.
Comparative structure studies are an excellent public relations tool that clearly demonstrates that the effects of blasting on structures are negligible compared with other normal and expected forces that can lead to cracking such as the natural aging of construction materials, human-induced vibrations, and weather changes.
Aimone-Martin Associates, LLC are leaders in structure response studies. We have refined instrumentation and analytical techniques first used by the U.S. Bureau of Mines for over 45 structures of various designs adjacent to mines, quarries and construction sites(1). Our studies convince home owners, regulators, and permitting agencies that blasting with the U.S Bureau of Mines recommended safe criteria for frequency-based ground vibrations does not result in structure cracking.
Our studies have successfully prevented the closure of two quarries and two construction sites to date. Our studies have increased public awareness that blasting can be conducted safely and in a manner that is protective to off-site structures.
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construction
equipment vibration
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