Response of Steel Moment and Braced Frames Subjected to Near-Source Pulse-Like Ground Motions by Including Soil-Structure Interaction Effects
Abstract: Most seismic
regulations are usually associated with fixed-base structures, assuming that
elimination of this phenomenon leads to conservative results and engineers are
not obliged to use near-fault earthquakes. This study investigates the effect
of soil–structure interaction on the inelastic response of MDOF steel
structures by using well known Cone method. In order to achieve this, three
dimensional multi-storey steel structures with moment and braced frame are
analysed using non-linear time history method under the action of 40 near-fault
records. Seismic response parameters, such as base shear, performance of
structures, ductility demand and displacement demand ratios of structures
subjected to different frequency-contents of near-fault records including pulse
type and high-frequency components are investigated. The results elucidate that
the flexibility of soil strongly affects the seismic response of steel frames.
Soil–structure interaction can increase seismic demands of structures. Also,
soil has approximately increasing and mitigating effects on structural
responses subjected to the pulse type and high frequency components. A
threshold period exists below which can highly change the ductility demand for
short period structures subjected to near-fault records.
Keywords: Near-Fault
Earthquakes; Soil-Structure Interaction; Cone Model; Steel Structure; Ductility
Demand
Author: Pooriya Ayough, Sara
Mohamadi, Seyed Ali Haj Seiyed Taghia
Journal Code: jptsipilgg170009
