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The present paper describes a method of detection of road irregularities using the accelerations recorded by the smartphones of drivers of different classes of vehicles.
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The results obtained using the acceleration recorded in the middle of the span (sensor #2) show similar behavior for the all cases analyzed.
The results obtained using the acceleration recorded in the middle of the span (sensor #6) show similar behavior for the three mass arrangements analyzed, Fig. 11 shows the results for the third case at the first level of decomposition, it is seen that the discontinuity is not significant enough to be detected.
Fourier spectra of two horizontal motions were calculated using the acceleration records with a duration of 81.92 s including S-wave portion.
(2) The proposed method does not account for the direction of wave propagation, but uses the acceleration record that exhibits the largest PGA to quantify resonance effect.
Consequently, the structural response (e.g., acceleration, displacement) at the non-instrumented floors remains unknown and needs to be estimated using the acceleration data recorded at the instrumented floors.
Figure 12 shows the acceleration time history of the first four motions involved in this scenario (note that the Aegion record was applied twice) in comparison with the accelerations recorded at the decks of the two piers.
The acceleration recorded by the smartphone is processed further.
Site amplification defined as the peak value of spectrum ratio was investigated using surface and base accelerations recorded in a number of KiK-net down-hole arrays in Japan during three major earthquakes.
Using damping ratios inferred from accelerations recorded during earthquakes in instrumented buildings in California this paper evaluates the Rayleigh damping model commonly used in seismic analysis of buildings.
When 1000 queries were used, the acceleration was only 2.9.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com