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Analysis of outrigger-braced RC supertall buildings: core-supported & tube-in-tube lateral systems

Kafina, R. and Sagaseta, J. (2018) Analysis of outrigger-braced RC supertall buildings: core-supported & tube-in-tube lateral systems The Structural Design of Tall and Special Buildings, 28 (1), e1567. pp. 1-22.

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Abstract

This study is primarily focused on the approximate analysis of reinforced concrete outriggers which are commonly used in the design and construction of Supertall Buildings subject to distributed horizontal loads. Existing global analysis formulae that provide preliminary results for lateral deflections and moments are reviewed for two lateral load resisting systems, namely Core-Supported-with-Outrigger system (CSOR) and less frequent Tube-in-Tube-with-Outrigger system (TTOR). These formulae are only applicable for CSOR and neglect the reverse rotation of the outrigger actually suffered due to the propping action from the outer columns; and give rather high predictions of the deflections compared to advanced numerical FE models. An improved model is proposed which overcomes this issue, and provides more consistent results to FE predictions. The same can also be extended to TTOR. Several case studies are investigated to verify the accuracy of the proposed methodologies. The global analysis is followed by the local analysis of reinforced concrete outrigger beams using strut-and-tie modelling and nonlinear finite element analysis to obtain optimised reinforcement layouts (reduction of quantities of reinforcement). The results highlight the different challenges in detailing such structural members which are heavily loaded (high congestion of reinforcement) and the behaviour at failure can be brittle.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Authors :
NameEmailORCID
Kafina, R.
Sagaseta, J.J.Sagaseta@surrey.ac.uk
Date : 21 December 2018
DOI : 10.1002/tal.1567
Copyright Disclaimer : © John Wiley & Sons Ltd. 2018. This is the peer reviewed version of the following article: Kafina, R, Sagaseta, J. Analysis of outrigger‐braced reinforced concrete supertall buildings: Core‐supported and tube‐in‐tube lateral systems. Struct Design Tall Spec Build. 2019; 28:e1567, which has been published in final form at https://doi.org/10.1002/tal.1567 . This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Uncontrolled Keywords : Supertall building; Reinforced concrete; Outrigger; Tube-in-tube; Lateral systems; Simplified model
Depositing User : Clive Harris
Date Deposited : 04 Oct 2018 15:23
Last Modified : 08 Nov 2019 02:08
URI: http://epubs.surrey.ac.uk/id/eprint/849572

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