Using Mushroom Shaped Basements Under
Buildings As An Isolator In Order To Reduce
The Earthquake Effect On Structures
Author(s)
A. Beirami Shahabi & M. Barghian
Abstract
A new base isolation method for reducing the destructive effect of earthquakes is
proposed. In this method mushroom shaped basements are used under structures
as base isolation. These basements have a spherical surface and are located on
foundations. Basements have arms that are connected to structure columns.
When the length of the arm is less than the radius of the spherical surface, their
action is similar to a spring, and so when a displacement in a structure happens, a
returning force is applied to the structure and the stability of the structure is
guaranteed. The specific of these springs is that their stiffness can easily be set.
The stiffness can be adjusted in such a way that firstly, the force applied to the
structure under earthquake load will be acceptable and, secondly, the maximum
displacement will not exceed allowable limit.
The basements together with the structure were modeled as a one-degree of
freedom system of a mass spring and damper. A FORTRAN program was
written to determine the response of the system against earthquake acceleration.
Three different earthquakes were considered. The results show that using the
proposed method is very effective in reducing the action of earthquakes on
structures.
Keywords: seismic isolation, passive control, mushroom shaped basements, ball
bearing isolation.
1 Introduction
Now a days base isolation is a new thought as an seismic design approach in
which the earth movement due to earthquake is limited from transmission to a
building, therefore the hazards of earthquake to structures are reduced [1].
Keywords
seismic isolation, passive control, mushroom shaped basements, ball
bearing isolation.
Related Book
Other papers in this volume
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