Experimental study on multi-panel retrofitted steel transmission towers

Mills, Julie E. and Ma, Xing and Zhuge, Yan (2012) Experimental study on multi-panel retrofitted steel transmission towers. Journal of Constructional Steel Research, 78. pp. 58-67. ISSN 0143-974X

Abstract

Due to the increasing demands on power supply and telecommunication services, existing transmission towers are frequently being required to carry extra loads above their initial design limits. A range of methods have therefore been used to increase the capacity of existing towers by retrofitting them in some way. This paper addresses steel lattice transmission towers with main leg members retrofitted by steel angles through bolted double steel angle connectors, a method that is widely used in practice but to date with little theoretical research to support it. Three unreinforced tower models and four groups of retrofitted tower models with and without preloading have been tested in the structural laboratories at the University of South Australia. The experimental results verify the effectiveness of the retrofitting method. Load sharing analysis shows that axial loads can be effectively transferred between original tower members and reinforcing members through the bolted-splice system. Preloading reduces the load sharing in reinforcing members in the early loading stage but does not have significant influence on the ultimate strength of the whole structure.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to published version due to publisher copyright policy.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 24 Mar 2013 07:18
Last Modified: 21 Jul 2014 05:12
Uncontrolled Keywords: steel lattice tower; transmission tower; retrofitting; load transfer lag; preloading
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090505 Infrastructure Engineering and Asset Management
09 Engineering > 0905 Civil Engineering > 090506 Structural Engineering
09 Engineering > 0913 Mechanical Engineering > 091307 Numerical Modelling and Mechanical Characterisation
Socio-Economic Objective: B Economic Development > 87 Construction > 8798 Environmentally Sustainable Construction > 879899 Environmentally Sustainable Construction not elsewhere classified
Identification Number or DOI: 10.1016/j.jcsr.2012.06.004
URI: http://eprints.usq.edu.au/id/eprint/21562

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