Title:
Optimum Locations of Outriggers in a Concrete Tall Building to Reduce Differential Axial Shortening
Author(s):
Han‑Soo Kim
Publication:
IJCSM
Volume:
13
Issue:
Appears on pages(s):
Keywords:
shortening, outrigger, tall building, optimization, concrete, creep
DOI:
10.1186/s40069-018-0323-y
Date:
2/28/2019
Abstract:
Differential axial shortening (DAS) in a tall building can produce adverse effects on its structural and nonstructural
elements. Therefore, DAS should be considered in the design phase and appropriate measures should be taken to
reduce its unfavorable effects. In this study, the utilization of outriggers, which has been originally designed to reduce
lateral displacements, is proposed to reduce DAS. The optimum locations of outriggers that minimize the maximum
DAS are determined by an optimization method. The integrality requirement posed by the outrigger locations, which
should be given as integer numbers, is resolved by piecewise quadratic interpolation with discrete analysis results. The
proposed optimization method stably yielded optimum solutions for a total of 24 design cases. The optimum design
results show that although the maximum DAS decreases as the number of outriggers increases, the maximum DAS
does not decrease significantly when the number of outriggers is greater than 2.