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INFLUENCE OF EFFECTIVE DURATION OF （有效持续时间的影响）
1234 INFLUENCE OF EFFECTIVE DURATION OF STRONG MOTION ON ELASTIC RESPONSE SPECTRA 1 2 Farzaneh HAMEDI And Mohsen TEHRANIZADEH SUMMARY In this paper the influence of effective duration of strong motion, soil condition, magnitude and shape of accelerogram time history on elastic response spectra have been investigated. A total of 108 Iran’s horizontal acceleration components strong motion records are selected. These accelerograms are catagorized in accordance with their earthquake parameters and soil condition of recording station and the influence of different conditions are plotted in graphs. In all cases the response spectra have been calculated for a structure with a damping ratio of 5%. Analytical results show that the influence of soil condition is very significant on the shape of response spectra. The influence of effective duration of strong motion, has been studied by definition based on energy of accelerogram. It can be seen that an increase in effective duration, causes reduction in the slope of response spectra in long period part and increases the spectral values. INTRODUCTION Response spectrum is the most suitable tool developed so far for expressing the excitation response relationship in earthquake engineering and seismic design. Although it is an indirect measure of ground motion intensity, it expresses maximum response directly which is a major co
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