Study on corollary of seismic base isolation system on buildings with soft storey

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Study on corollary of seismic base isolation system on buildings with soft storey

Author: A. B. M. Saiful Islam1 *, Mohammed Jameel , Syed Ishtiaq Ahmad and Mohd Zamin Jumaat | Size: 0.33 MB | Format: PDF | Quality: Unspecified | Publisher: nternational Journal of the Physical Sciences Vol. 6(11), pp. 2654-2661, 4 June, 2011 Available DOI: 10.5897/AJBM10.516 ISSN 1992 - 1950 ©2011 Academic Journals | Year: 2011 | pages: 8

Soft storey buildings are characterized by having a storey which has a lot of open spaces. This soft
storey creates a major weak point in an earthquake. Since soft stories are classically associated with
retail spaces and parking garages, they are often on the lower stories of a building, which means that
when they collapse, they can take the whole building down with them, causing serious structural damage
which may render the structure totally unusable. In this study, efforts have been given to examine the
effect of incorporation of isolator on the seismic behavior of buildings subjected to the appropriate
earthquake for medium risk seismicity region. It duly ensures incorporating isolator with all relevant
properties as per respective isolators along with its time period and damping ratio. Effort has also been
made here to build up a relationship for increasing storey height and the changes for incorporating
isolator with same time period and damping ratio for both lead rubber bearing (LRB) and high damping
rubber bearing (HDRB). Dynamic analyses have been carried out using response spectrum and time
history analysis. Behavioral changes of structural parameters are investigated. The study reveals that the
values of structural parameters reduce a large amount while using isolator. However, LRB is found
beneficial than HDRB. The structure experiences huge storey drift at the soft storey level that may be
severe and cause immature failure. The amount of masonry infill is very vital for soft storey buildings as
its decrement increases reasonable displacements.

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