Structural Engineering and Mechanics

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Parametric analysis of hybrid outrigger system under wind and seismic loads

  • Neethu Elizabeth Johna (Department of Civil Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education) ;
  • Kiran Kamath (Department of Civil Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education)
  • Received : 2022.09.26
  • Accepted : 2023.04.12
  • Published : 2023.05.25
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Abstract

In tall constructions, the outriggers are regarded as a structural part capable of effectively resisting lateral loads. This study analyses the efficacy of hybrid outrigger system in high rise RCC building for various structural parameters identified. For variations in α, which is defined as the ratio of the relative flexural stiffness of the core to the axial rigidity of the column, static and dynamic analyses of hybrid outrigger system having a virtual and a conventional outrigger at two distinct levels were conducted in the present study. An investigation on the optimal outrigger position was performed by taking the results from absolute maximum inter storey drift ratio (ISDmax), roof acceleration (accroof), roof displacement (disproof), and base bending moment under both wind and seismic loads on analytical models having 40, 60 and 80 storeys. An ideal performance index parameter was introduced and was utilized to obtain the optimal position of the hybrid outrigger system considering the combined response of ISDmax, accroof, disproof and, criteria required for the structure under wind and seismic loads. According to the behavioural study, increasing the column area and outrigger arm length will maximise the performance of the hybrid outrigger system. The analysis results are summarized in a flowchart which provides the optimal positions obtained for each dependent parameter and based on ideal performance index which can be used to make initial suggestions for installing a hybrid outrigger system.

Keywords

Acknowledgement

We would like to thank the Manipal Academy of Higher Education, Manipal, Karnataka, India for all the support provided.

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