Volume 4, Issue 3

Optimum Positioning of Outriggers to Reduce Differential Column Shortening Due to Long Term Effects in Tall Buildings

Author

Kiran Kamath, Shashikumar Rao* and Shruthi

Abstract

In the present study, a 60-storey 3-D RC frame with core wall at the centre is considered for finding out the shortening of column. The parameter considered to reduce the effect of differential column shortening is the effects of outriggers at different levels under the action of elastic, creep and shrinkage shortening. It was found that the differential column shortening is reduced by 34% when one outrigger is introduced at the optimum level of H/h1=1.715. Along with this optimum position of the outrigger, another outrigger is introduced at different levels to further reduce the differential column shortening and the optimum position of second outrigger is found out that will give the minimum differential column shortening. It was found that second outrigger at H/h2=1.33 level reduces the differential shortening by 14% in addition to that reduced by first outrigger. The present analysis is carried out using a finite element software MIDASGen and by plotting storey height versus differential column shortening between the outer peripheral column and the core wall for different positions of the outriggers.

DOI

https://doi.org/10.62226/ijarst20150320

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