EFFECT OF SOIL-STRUCTURE INTERACTION ON SEISMIC RESPONSE
OF HIGH-RISE BUILDINGS
(A Case Study of Jakarta, Indonesia)
ABSTRACT
The effects of soil-structure interaction (SSI) had been recognized to give a beneficial
effect to the seismic response of the structure. Therefore, structures are generally
designed without considering SSI to give a conservative design. However, recent
studies show that the effects of SSI may be detrimental to the seismic response of
structure and neglecting SSI in analysis may lead to unconservative design. In this
study, the effects of SSI are analyzed for typical high-rise building in Jakarta,
Indonesia. Nonlinear dynamic time history analyses are performed for 3 different
foundation models (fixed, pile, and raft foundation) to asses the effects of SSI on
seismic response of the buildings for different foundation types. The inclusion of
seismic SSI is modeled through dynamic beam on nonlinear Winkler foundation
method. The nonlinear behavior of the structure is modeled using lumped plasticity
model. The nonlinear response history analysis (NLRHA) of the structure is
performed under maximum considered earthquake (MCE) level for Jakarta city. The
scaled strong motion records from 5 famous earthquakes around the world and 2
earthquakes from Indonesia are used to cover the wide variability of the earthquake
characteristics. The results show that the effects of SSI in term of peak story shear and
moment had been reduced when considering SSI. However, in some part of the
building the response from the SSI analysis gives a larger response compared to the
non-SSI analysis. Therefore, the effects of SSI on this building are not always
beneficial but may be detrimental in some part of the building. The detrimental effects
of SSI are also identified from interstory drift response. The consideration of SSI has
increased the plastic deformation of the building. The effects of foundation types on
the SSI analyses only influence the response at the podium level while the response
above the podium level remain no effects. At the podium level, less response is
provided from raft foundation case with SSI consideration.
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