| Περίληψη: | An earthquake damage warning system –called Intensiometer- has been
proposed as a low cost alternative to the widely used traditional earthquake warnbased system. The rapid evaluation of integrated circuits, sensor and
microcontrollers technologies over the last decades, as well as the reducing price
and size, would make possible the development of such a low cost earthquake
damage warning system. The most important improvement of the proposed
system is the insertion of a new ground motion parameter CAV5 - cumulative
absolute velocity after application of 5 cm/ sec2
threshold acceleration. In the
present study, based on the relationship ground motion-damage, CAV5 have
been found to be suitable parameter to describe the damage potential of a
ground motion. The damage warning system was developed to quantify and
report the earthquake intensity, with the aim of an Engineering Intensity Scale
(EIS). Engineering Intensity Scale has been constructed based on the
relationship between CAV5 parameter and Modified Mercalli Intensity (MMI) scale
and embedded into the damage warning device. The Intensiometer has been
developed to analyze the three components of an earthquake record and to
trigger only the event of a damaging earthquake, typically MMI VI or greater. The
Intensiometer is not triggered by smaller, non-damaging earthquakes or other
sources of vibration such as vehicles, and construction equipment.
Two were the aims of this research study. One was to detect an appropriate
ground motion parameter capable to describe the damage potential of a ground
motion. The second one was to incorporate the selected parameter into a
damage warning system to minimize the hazards of catastrophic ground motion.
The benefits of developing a damage potential warning system are multiple,
including site specific applications, building automation strategy, shut off gas and
water valves damage, shut down industrial processes, lock/unlock electronic
doors, control elevators, protect assets and supplies, as well as a low-cost single
user approach, such as for a typical homeowner.
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