Abstract
This paper presents some important results of a thorough investigation into the seismic behaviour of a wide range of Base Isolated multistorey structures. The benefits of implementing BI systems are highlighted. The reduction and distribution patterns of lateral inertia forces due to the inclusion of this isolation system are specifically discussed.
Highlights
During the last two decades the Base Isolation (BI) technique has gained increasing recognition as indicated by the application of various BI systems to a large number of bridges, several multistorey buildings and some power plants in countries which have high seismic risk
In New Zealand alone .there are more than 20 Base Isolated (BI) bridges and three BI multistorey buildings, namely the William Clayton Building in Wellington [1], Union House in Auckland [2] and the Wellington Police
As a result the design practice at present still relies upon a series of deterministic time history analyses with direct step-by-step integration which are impractical for design purposes but appear unable to give the designer a clear insight into the seismic behaviour of BI multistorey structures
Summary
During the last two decades the Base Isolation (BI) technique has gained increasing recognition as indicated by the application of various BI systems to a large number of bridges, several multistorey buildings and some power plants in countries which have high seismic risk. As a result the design practice at present still relies upon a series of deterministic time history analyses with direct step-by-step integration which are impractical for design purposes but appear unable to give the designer a clear insight into the seismic behaviour of BI multistorey structures. Based on the results obtained, the above research was directed to accomplish its second objective which is to develop a simple design procedure for this type of structure. A proposed design approach is described in an accompanying paper( 5 l
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