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ID: <

10670/1.7eortf

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Consideration of speed pulses in the design of basic seismic insulation structures

Abstract

The movement of the soil in the regions close to the seismic source can present impulsive characteristics due to the directivity effects of the rupture. Thus, the acceleration records close to the seismogenic faults present large amplitudes; but it is in the time history of ground velocities where the impulsive character becomes more evident through high amplitude velocity pulses and long periods. These pulses are responsible for the high demands and damage to the structures. In the last decade seismic isolation devices have reached a high boom both in research and development with practical applications in buildings as an effective means of seismic protection. Essentially the technique consists of having low stiffness insulators as an interface between the foundations and the body of the building so that it is possible to concentrate the deformations in it while extending the structural period in search of smaller ordinates of the design spectrum. This methodology may not be efficient when the structure is located in an area exposed to near-field earthquakes; the insulation devices may carry the structural period to the spectral region dominated by the velocity pulses and therefore more severe. This work presents a methodology that allows to determine the regions of the acceleration spectra that are dominated by the velocity pulses that contain the movement of the ground. It consists of plotting a composite diagram ground velocity - Response spectrum - Time of occurrence of the maximum response (V-E-T). The proposed methodology may be helpful for the preliminary design of the basic seismic isolation devices.

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