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Structural Engineering and Mechanics Volume 45, Number 5, March10 2013 , pages 655-676 DOI: https://doi.org/10.12989/sem.2013.45.5.655 |
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Soil structure interaction effects on structural parameters for stiffness degrading systems built on soft soil sites |
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Muberra Eser Aydemir
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| Abstract | ||
| In this study, strength reduction factors and inelastic displacement ratios are investigated for SDOF systems with period range of 0.1-3.0 s considering soil structure interaction for earthquake motions recorded on soft soil. The effect of stiffness degradation on strength reduction factors and inelastic displacement ratios is investigated. The modified-Clough model is used to represent structures that exhibit significant stiffness degradation when subjected to reverse cyclic loading and the elastoplastic model is used to represent non-degrading structures. The effect of negative strain – hardening on the inelastic displacement and strength of structures is also investigated. Soil structure interacting systems are modeled and analyzed 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 inhouse computer program. New equations are proposed for strength reduction factor and inelastic displacement ratio of interacting system as a function of structural period (T̃, T), ductility (u) and period lengthening ratio (T̃/T). | ||
| Key Words | ||
| soil-structure interaction; stiffness degradation; strength reduction factor; inelastic displacement ratio; ductility demand; structural analysis | ||
| Address | ||
| Muberra Eser Aydemir: Department of Civil Engineering, Istanbul Aydin University, Istanbul, Turkey | ||