Study of seismic control systems on the behaviour of industrial storage racks

Sorourian, S

Study of seismic control systems on the behaviour of industrial storage racks

Sorourian, S

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Publication Type:: Thesis
Issue Date:: 2014

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Field	Value	Language
dc.contributor.author	Sorourian, S
dc.date.accessioned	2015-11-27T03:51:24Z
dc.date.available	2015-11-27T03:51:24Z
dc.date.issued	2014
dc.identifier.uri	http://hdl.handle.net/10453/38390
dc.description	University of Technology Sydney. Faculty of Engineering and Information Technology.	en_AU
dc.description.abstract	Steel storage racks are structures which are used in factories and warehouses to store goods and merchandises. They consist of uprights, beams and braces made of cold-formed steel, and although they are very light in comparison with conventional structures, they are designed to carry very heavy loads. Storage racks are designed to resist horizontal loads in orthogonal directions using two different frame systems: moment resisting frames in down aisle direction and braced frames in cross aisle direction. The design of racks is different from typical buildings because they are made of slender thin walled members, hence, making them sensitive to global, local, and distortional buckling if overloaded. Moreover; the connections demonstrate highly nonlinear behaviours under loading. Due to the aforementioned reasons, the design of racks poses major challenges for engineers especially in seismic regions where mitigating the vulnerability of racks is important. The objective of this numerical and experimental research was to investigate the seismic behaviour of storage racks and to establish the effectiveness of two alternative control systems to improve the performance of the racks under seismic loads. The control systems studied are new generation passive dampers: (i) a pounding tuned mass damper (PTMD) and (ii) a base isolation system. Full scaled shake table testing was performed at the University of Technology, Sydney (UTS) to study the dynamic behaviour of storage racks and to verify the numerical models. As part of the research, numerical models based on the Finite Element Method (FEM) were developed and applied to conduct parametric analyses of the racks in order to compare the seismic response of cross aisle braced frames of different heights with and without control devices. The FEM results showed that PTMD dampers enhance by up to 40% the seismic behaviour of racks under 5 meters height while the base isolation system was more effective for tall racks. Financial support for this research was provided by Dexion.	en_AU
dc.format	Thesis (PhD)
dc.language.iso	en_AU	en_AU
dc.relation	https://opus.lib.uts.edu.au/bitstream/10453/38390/2/02whole.pdf
dc.rights	The author owns the copyright in this thesis including all reproduction and reuse rights for the work. The work may not be altered without the permission of the copyright owner. Attribution is essential when quoting or paraphrasing from this thesis.
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	au.edu.uts.lib/ppc
dc.title	Study of seismic control systems on the behaviour of industrial storage racks	en_AU
dc.type	Thesis	en_AU
utslib.copyright.status	open_access

Abstract:

Steel storage racks are structures which are used in factories and warehouses to store goods and merchandises. They consist of uprights, beams and braces made of cold-formed steel, and although they are very light in comparison with conventional structures, they are designed to carry very heavy loads. Storage racks are designed to resist horizontal loads in orthogonal directions using two different frame systems: moment resisting frames in down aisle direction and braced frames in cross aisle direction. The design of racks is different from typical buildings because they are made of slender thin walled members, hence, making them sensitive to global, local, and distortional buckling if overloaded. Moreover; the connections demonstrate highly nonlinear behaviours under loading. Due to the aforementioned reasons, the design of racks poses major challenges for engineers especially in seismic regions where mitigating the vulnerability of racks is important. The objective of this numerical and experimental research was to investigate the seismic behaviour of storage racks and to establish the effectiveness of two alternative control systems to improve the performance of the racks under seismic loads. The control systems studied are new generation passive dampers: (i) a pounding tuned mass damper (PTMD) and (ii) a base isolation system. Full scaled shake table testing was performed at the University of Technology, Sydney (UTS) to study the dynamic behaviour of storage racks and to verify the numerical models. As part of the research, numerical models based on the Finite Element Method (FEM) were developed and applied to conduct parametric analyses of the racks in order to compare the seismic response of cross aisle braced frames of different heights with and without control devices. The FEM results showed that PTMD dampers enhance by up to 40% the seismic behaviour of racks under 5 meters height while the base isolation system was more effective for tall racks. Financial support for this research was provided by Dexion.

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http://hdl.handle.net/10453/38390