INFLUENCE OF INPUT MOTION SCALING METHODS ON DECOUPLED SSI DYNAMIC ANALYSIS
Abstract
Propagation of seismic waves through soil deposits may considerably alter their
characteristics at surface. This ultimately influences the seismic performance of structures.
The influences of soil deposits are included in seismic codes (e.g. Eurocode 8, EC8) by means
of proposed design response spectra for different soil classes used in design or retrofitting
of structures. Nevertheless, a smooth design response spectrum cannot always represent
spectral response of an actual input motion over an engineering period of interest due to
its irregular spectral shape. Subsequently, the seismic performance of a structure may be
insufficient when a design response spectrum is used. The interaction between soil and
structure may also affect the structural behaviour. This study aims to demonstrate the
impact of adoption of input motions and soil deposits with soil classes B, C and D on the
seismic behaviour of one-bay, 1-storey structure modelled in OpenSEES For this purpose,
two different approaches are chosen; (i) seven input motions recorded on ground surface
are modified and applied to the model, (ii) seven outcrop motions are scaled according to
EC8 and processed through the ideal soil deposits by conducting nonlinear site response
analysis, then applied to the model. The results indicate that the model is exposed to more
drift responses when it is on softer soil deposit. In addition, imposing input motions
obtained at surface from nonlinear site response analysis cause higher drift responses than
directly applying input motions.
Keywords
Soil classes , Design response spectrum , Outcrop/surface motion
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