Advanced Steel Construction

Vol. 12, No. 2, pp.134-153 (2016)


OPTIMUM POSITION OF STEEL OUTRIGGER SYSTEM FOR HIGH RISE COMPOSITE BUILDINGS SUBJECTED TO WIND LOADS

 

Sabrina Fawzia1,* and Tabassum Fatima2

1, 2 Science and Engineering Faculty, School of Civil Engineering and Built Environment,

Queensland University of Technology, Brisbane 4000, Queensland, Australia

*(Corresponding author: E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it. )

Received: 16 January 2015; Revised: 17 June 2015; Accepted: 3 July 2015

 

DOI:10.18057/IJASC.2016.12.2.4

 

ABSTRACT:

The responses of composite buildings under wind loads clearly become more critical as the buildingbecomes taller, less stiff and more lightweight. When the composite building increases in height, the stiffness of thestructure becomes more important factor and introduction to belt truss and outrigger system is often used to providesufficient lateral stiffness to the structure. Most of the research works to date is limited to reinforced concretebuilding with outrigger system of concrete structure, simple building plan layout, single height of a building, onedirection wind and single level of outrigger arrangement. There is a scarcity in research works about the effectiveposition of outrigger level on composite buildings under lateral wind loadings when the building plan layout, heightand outrigger arrangement are varied. The aim of this paper is to determine the optimum location of steel belt andoutrigger systems by using different arrangement of single and double level outrigger for different size, shape andheight of composite building. In this study a comprehensive finite element modelling of composite buildingprototypes is carried out, with three different layouts (Rectangular, Octagonal and L shaped) and for three differentstorey (28, 42 and 57-storey). Models are analysed for dynamic cyclonic wind loads with various combination ofsteel belt and outrigger bracings. It is concluded that the effectiveness of the single and double level steel belt andoutrigger bracing are varied based on their positions for different size, shape and height of composite building.

 

Keywords:Steel structure, Lateral deflection, Outriggers, Composite building, Multi-storey, Wind load

 

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