Seismic Behavior of High-rise Building having Symmetric and Asymmetric Setback with Steel Bracing
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Date
2017-11
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Addis Ababa University
Abstract
Construction of vertical geometric irregular buildings is very common due to space,
architectural and functional constraints. This paper is concerned with the behaviour of
various vertical geometrical irregularities of symmetric and asymmetric setback by
different types of bracing. For this study twenty five story buildings 12 modeling have
been analyzed considering different types of vertical geometric irregularities and different
steel bracings using response spectrum analysis with the help of ETABS 2015 software.
The response of the these setback structures are obsereved with lateral displacement, story
drift, shear force and bending moment.
From addition of X type brace, V type brace and Inverted V type brace shows that use of
X-type of bracing is found more efficent and significantly contributes to the structural
stiffness and reduces the maximum interstorey drift and lateral displacement of the frames.
This study may help the practicing engineers to improve and understanding about seismic
susceptibility of setback buildings, and using steel bracing is one of the advantageous
concepts which can be used to strengthen or retrofit the existing structures..
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Keywords
symmetric and asymmetric setback, Steel Bracing, RC building, Response Spectrum Analysis