Seismic Energy Demand Mapping of Regions Using Energy-Based Methodology

Abstract eng:
Different seismic hazard maps, showing probable peak ground accelerations and velocities or intensities in terms of magnitudes and damage indices, which were developed for specific regions in the world, are based on past earthquake records. They are useful source of information in predicting the affects of future earthquakes. With these maps, seismic spectra or artificial earthquakes could be produced to estimate the seismic forces acting on the structures. The earthquakes produce energy and depending on the level of intensity of the earthquake and the natural period of the structure including the effect of soil-structure interaction, the produced energy (named as input energy) is imparted into to the structure. If the total input energy is known, the structure could be designed in such as way that its members dissipate enough energy and sudden collapse could be prevented. This paper introduces a concept and a procedure to determine the input energy through constructing regional seismic energy demand contours. The analysis is based on obtaining an attenuated earthquake record, using a bi-linear hysteresis SDOF system and the equation of motion integrated in the displacement domain, and producing charts showing the relationship between input energy, mass, period and scaled ground motion intensity. These charts are then incorporated into seismic energy demand contours or mapping of a selected region.

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