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Publications in Scientific Journals:

B. Khalid, F. Ziegler:
"A novel aseismic foundation system for multipurpose asymmetric buildings";
Archive of Applied Mechanics, 82 (2012), 1423 - 1437.



English abstract:
The vulnerability of civil engineering structures with fundamental frequency, say roughly above
1Hz, (or buildings having less than ten stories), when exposed to the strong motion phase of an earthquake
is considerably reduced by means of base isolation. The low-pass filter for isolating horizontal vibrations is
redesigned where the classical elastomeric bearings are substituted by a number of prestressed helical steel
springs with pivoted columns along their vertical axes carrying a fraction of the dead weight and guiding the
remaining horizontal motion. The base-isolated building in its fundamental mode is considered to be rigid
and low-cost tuned liquid column gas dampers (TLCGDs), in optimal arrangement within the plan of the
basement of the building, supply the effective damping of the remaining horizontal vibrations. TLCGD-tuning
in a first step is performed by a simple transformation of the well-documented optimal parameters of the
tuned mass damper (TMD) followed by fine-tuning in state space. The action of the passive damping device
is commonly considered to be sufficient. Since the gas-spring effect somewhat counter acts changes in fluid
mass, the absorber can be used as a water reservoir. Compatible sliding elements are innovatively designed
to resist the motion of the building relative to the ground for sufficiently small disturbances by static friction,
thus complete the isolation system. However, during seismic excitation, the frictional contact is released over
much of the time to avoid excessive wear.

Keywords:
Vibration control · Base isolation · Asymmetric buildings · Tuned liquid column gas dampers · Seismic excitation


"Official" electronic version of the publication (accessed through its Digital Object Identifier - DOI)
http://dx.doi.org/10.1007/s00419-012-0667-8


Created from the Publication Database of the Vienna University of Technology.