Factors affecting the architectural design of base isolated buildings

Abstract

Why do a research report on base isolation? The short answer is the lack of concise and comprehensive information available for those architects interested in using base isolation to protect their clients' buildings from earthquake damage. Most architects are aware that New Zealand has a heavy exposure to earthquakes. The occurrence of a devastating earthquake in this country is not a question of whether it will happen, but when! Consequently, the seismic design code (NZS 4203) [1] indirectly limits architects to the choice of building materials and structural configurations which are deemed acceptable for buildings located near active seismic regions. In 1987, my interest in base isolation was stimulated by an article in "Architecture" magazine [2], written by the architect Christopher Arnold. His enthusiasm encouraged me to search out further information on the subject. Unfortunately, the information I found was far too technical for architects to digest. Through my frustration, I was determined that architects working in this earthquake prone country should be made aware of this alternative method of seismic prevention. Engineers cannot always be relied upon to suggest base isolation as an option for new buildings. Indeed, Forell et al [3] believe that many engineers are either too traditional, or too inexperienced themselves to confidently attempt a base isolation design. In such cases the motivation to consider the use of base isolation must come from the architect.