Design optimisation of drag struts for seismic and wind loading in multi-storied structures

Reynolds, Brayden (2021) Design optimisation of drag struts for seismic and wind loading in multi-storied structures. [USQ Project]

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REYNOLDS Brayden dissertation_redacted.pdf

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Modern-day structures are becoming increasingly complex, the requirement for energy dissipation research for seismic and wind loadings is becoming critical for structural optimisation. These dissipation devices allow ductility (the ability to withstand tensile stress under plastic deformation without failure) within a bracing system or base fixture in a seismic event by acting as a sacrificial component or a vibration mitigation control in a wind event. Effective designs of the energy dissipation system are critical in how a system responds; an efficient design reduces loading throughout a structure.

Optimisation of a drag strut would allow the introduction of ductility in a member that is a critical component of any building. A drag strut is a component that transmits load axially throughout a structure. Therefore, purlins, tie-beams, etc., can work as a drag strut if responsible for withstanding compression in a bracing system. Optimising drag struts is not a replacement but may aid in the capacity design of a structure, allowing for energy dissipation and potentially life-saving minutes during a significant event.

The research focused on adapting existing industry techniques to validate the feasibility of the concept; therefore, the research optimised scenario was the connection between a concrete floor slab and a vertical tilt panel with an EA drag strut combining the two. The research utilised non-linear simulation and a scaled model on a shake table to replicate vibration deflections during ground excitation. The investigation found that a reduction in vertical section by 53% allowed localised stress distribution in the reduced area, allowing for flexure in the drag strut if aligned with the construction gap between panels, minimising deformation before yielding, and forming a plastic deformation zone during excessive loads in a significant event. The concept achieved minimal ductility, preventing a reduction in seismic loads; however, it allowed for capacity design and a potential relationship with a rocking panel concept due to its flexible nature.

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Item Type: USQ Project
Item Status: Live Archive
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 - 31 Dec 2021)
Supervisors: Banerjee, Sourish
Qualification: Bachelor of Engineering (Honours) (Civil)
Date Deposited: 03 Jan 2023 04:17
Last Modified: 26 Jun 2023 01:56
Uncontrolled Keywords: seismic, wind, loading, optimisation, dissipation, ductility, bracing, vibration mitigation, drag strut

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