Concurrent effects of inertial and kinematic soil-structure interactions on strength-ductility-period relationship

Ahmadi, Ehsan (2019) Concurrent effects of inertial and kinematic soil-structure interactions on strength-ductility-period relationship. Soil Dynamics and Earthquake Engineering, 117, 174-189. (doi:10.1016/j.soildyn.2018.10.043).

Abstract

As a key stage of performance-based seismic design of structures, strength-ductility-period relationship is used to determine either inelastic strength or ductility ratio of the structure with a specific fundamental vibration period. On the other hand, period, strength, and ductility demands of structures are significantly affected by inertial and kinematic soil-structure interactions. Hence, this study addresses strength-ductility-period relationship of structures with embedded foundations subjected to non-pulse earthquakes. To achieve this goal, a soil-foundation-structure interaction system well suited for parametric study was used: the soil beneath the rigid foundation was considered as a half-space, the foundation was modelled using a stack of discretised embedded disks, and the structure was modelled as an equivalent single-degree-of-freedom oscillator. A number of soil-foundation-structure interaction systems defined according to key interaction dimensionless parameters were analysed subjected to a suit of 40 non-pulse ground motions. The results show that ductility ratio spectra are significantly influenced by inertial and kinematic interaction effects. It is also found that equal displacement rule can be either valid or invalid under different soil-foundation-structure interaction effects. Further, a practice-oriented mathematical expression was recommended for ductility ratio of soil-foundation-structure interaction systems, which can find use in performance evaluation of existing structures with embedded foundation.

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