Seismic design of yielding structures on flexible foundations |
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| Authors: | Masoud Moghaddasi Gregory A MacRae J? G Chase Misko Cubrinovski Stefano Pampanin |
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| Institution: | 1. Buildings & Places, AECOM, Auckland, New Zealand;2. Department of Civil Natural Resources Engineering, University of Canterbury, Christchurch, New Zealand;3. Department of Mechanical Engineering, University of Canterbury, Christchurch, New Zealand |
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| Abstract: | This paper introduces a simple method to consider the effects of inertial soil–structure interaction (SSI) on the seismic demands of a yielding single‐degree‐of‐freedom structure. This involves idealizing the yielding soil–structure system as an effective substitute oscillator having a modified period, damping ratio, and ductility. A parametric study is conducted to obtain the ratio between the displacement ductility demand of a flexible‐base system and that of the corresponding fixed‐base system. It is shown that while additional foundation damping can reduce the overall response, the effects of SSI may also increase the ductility demand of some structures, mostly being ductile and having large structural aspect ratio, up to 15%. Finally, a design procedure is provided for incorporation of the SSI effects on structural response. Copyright © 2015 John Wiley & Sons, Ltd. |
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| Keywords: | soil– structure interaction yielding structures displacement ductility demand detrimental soil– structure interaction effects displacement‐based design procedure |
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