Modelling of steel lattice tower angle legs reinforced for increased load capacity

Zhuge, Yan and Mills, Julie E. and Ma, Xing (2012) Modelling of steel lattice tower angle legs reinforced for increased load capacity. Engineering Structures, 43. pp. 160-168. ISSN 0141-0296

Abstract

As a result of changes in design code requirements for wind loads, increased demand for electrical power, and the growing communication industry, retrofitting of existing steel lattice towers has become an important strategy in the transmission tower industry. At present there are two main reinforcing methods that are used in practice for lattice transmission towers. The first method involves adding a number of horizontal braces (diaphragms) to the mid-length of slender, inadequately braced members along the height of the tower; while the second method is focused on strengthening the capacity of the existing legs only by retrofitting them with additional members. In this paper, the most effective leg retrofitting method has been investigated through an experimental testing program using a one-panel angle leg retrofitting model and a non-linear finite element (FEM) model. A 3D continuum element was developed to model the panels and bolted connections and the results are compared with those obtained from experiments, with good agreement. The model was then simplified using a simple locking system where a special technique was developed to simulate the bolt slip, which was found to be a critical issue from the experiments. The simplified model can then be extended to multi-panel modelling.


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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 02:05
Last Modified: 21 Jul 2014 05:10
Uncontrolled Keywords: steel lattice transmission tower; retrofitting; finite element modelling
Fields of Research : 12 Built Environment and Design > 1204 Engineering Design > 120405 Models of Engineering Design
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.engstruct.2012.05.017
URI: http://eprints.usq.edu.au/id/eprint/21561

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