Limit Height-to-width Aspect Ratios For Slender
Base Isolated Objects Of Heritage Architecture
Author(s)
S. Petrovčič, D. Koren & V. Kilar
Abstract
Seismic isolation has become a realistic alternative for decreasing the seismic
vulnerability of heritage architecture. This article deals with a special technical
aspect of base isolation design of slender rigid objects on elastomeric isolators,
by considering the condition that the isolators cannot bear any tensile forces
under simultaneous horizontal and vertical ground excitations. The main
parameters that govern the response in this case are a) mass, mass position and
height-to-width aspect ratios of the superstructure, b) stiffness, damping and plan
arrangement of the isolators and c) expected horizontal as well as vertical
earthquake acceleration components and their interconnections. The limit
height-to-width aspect ratios were obtained for horizontal and vertical
accelerations from the Eurocode 8 response spectra, as well as from dynamic
analyses of seven near-fault ground motion records. The results are presented as
maximum allowable aspect ratios for different vibration periods, ground
conditions and design ground accelerations. The inclusion of vertical
accelerations in governing equations is extremely important because different
horizontal and vertical seismic loading combinations might significantly
influence the maximum allowable height-to-width aspect ratios. The article
concludes that the results from the response spectrum analysis are conservative.
Although, in some ground motion records, the critical combination of horizontal
and vertical response accelerations can also produce smaller limit height-towidth
aspect ratios.
Keywords: base isolation, elastomeric isolators, limit aspect ratios, vertical and
horizontal ground excitations.
Keywords
base isolation, elastomeric isolators, limit aspect ratios, vertical and
horizontal ground excitations
Related Book
Other papers in this volume
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