Influence of the location of resistant cores on the seismic response of a reinforced concrete three-dimensional frame equipped with HDRB base isolation devices
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abstract
The present work addresses the structural behaviour of three-dimensional reinforced
concrete buildings with concrete cores of resistant walls and seismic isolation. In
this study a single asymmetric concrete core was placed in a 10 floor 3D building
and then a set of numerical analyses were made for several geometric arrangements
without and with High-Damping Rubber Bearings (HDRB). This base isolation
system is used in order to reduce the structural seismic response and its associated
damage. In order to evaluate the importance of the basic location of these structural
elements, a parametric study was carried out changing the in-plan core location
associated with symmetrical and asymmetrical structural distribution of the in-plan
stiff core. The buildings were modelled using the commercial package SAP-2000
and the seismic analyses were carried out in accordance with the new European
Code for seismic analysis and design: Eurocode 8 (EC8); the national annex was
used to define the Portuguese elastic spectra.
