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Structural Engineering and Mechanics Volume 39, Number 5, September10 2011 , pages 683-701 DOI: https://doi.org/10.12989/sem.2011.39.5.683 |
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The effect of soil-structure interaction on inelastic displacement ratio of structures |
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Muberra Eser and Cem Aydemir
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| Abstract | ||
| In this study, inelastic displacement ratios and ductility demands are investigated for SDOF systems with period range of 0.1-3.0 s. with elastoplastic behavior considering soil structure interaction. Earthquake motions recorded on different site conditions such as rock, stiff soil, soft soil and very soft soil are used in analyses. Soil structure interacting systems are modeled with effective period, effective damping and effective ductility values differing from fixed-base case. For inelastic time history analyses, Newmark method for step by step time integration was adapted in an in-house computer program. Results are compared with those calculated for fixed-base case. A new equation is proposed for inelastic displacement ratio of interacting system (CR) as a function of structural period of interacting system (T), strength reduction factor (R) and period lengthening ratio (T/T). The proposed equation for which takes the soil-structure interaction into account should be useful in estimating the inelastic deformation of existing structures with known lateral strength. | ||
| Key Words | ||
| soil-structure interaction; inelastic displacement ratio; ductility demand; lateral strength; seismic analysis | ||
| Address | ||
| Muberra Eser and Cem Aydemir: Department of Civil Engineering, Yildiz Technical University, Istanbul, Turkey | ||