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Assessment of U-type wrought iron railway bridges

Assessment of U-type wrought iron railway bridges
Assessment of U-type wrought iron railway bridges
A number of assessment codes and guides exist that take into account the particular details of old U-frame types and riveted wrought iron construction; however, a significant number of old bridges still have details that cause difficulty in reliable assessment or require very conservative assumptions, giving low assessed capacity. In this paper, an alternative assessment method using non-linear finite-element analysis of an old U-frame railway bridge is presented. By using the analysis results, some guidelines and recommendations are suggested that are considered to be useful for the assessment by the engineering community. However, this approach also has limitations, as it is reliant on assumptions that can be difficult to confirm without extensive field monitoring and experimental testing. The analysis results showed that main girders with non-code-compliant U frames do indeed benefit from a low but significant level of restraint to resist lateral torsional buckling and also that girders that are marginally non-compact based on codified assessment methods may actually have sufficient local stability to provide additional flexural capacity beyond the elastic moment capacity.
bridges/field testing, monitoring, bridges, buildings, structures & design, field testing & monitoring
58-67
Canning, Lee
8450ecaf-2967-4203-b00b-9b978d0ed9c1
Kashani, Mohammad Mehdi
d1074b3a-5853-4eb5-a4ef-7d741b1c025d
Canning, Lee
8450ecaf-2967-4203-b00b-9b978d0ed9c1
Kashani, Mohammad Mehdi
d1074b3a-5853-4eb5-a4ef-7d741b1c025d

Canning, Lee and Kashani, Mohammad Mehdi (2016) Assessment of U-type wrought iron railway bridges. Proceedings of the Institution of Civil Engineers - Engineering History and Heritage, 169 (2), 58-67. (doi:10.1680/jenhh.15.00017).

Record type: Article

Abstract

A number of assessment codes and guides exist that take into account the particular details of old U-frame types and riveted wrought iron construction; however, a significant number of old bridges still have details that cause difficulty in reliable assessment or require very conservative assumptions, giving low assessed capacity. In this paper, an alternative assessment method using non-linear finite-element analysis of an old U-frame railway bridge is presented. By using the analysis results, some guidelines and recommendations are suggested that are considered to be useful for the assessment by the engineering community. However, this approach also has limitations, as it is reliant on assumptions that can be difficult to confirm without extensive field monitoring and experimental testing. The analysis results showed that main girders with non-code-compliant U frames do indeed benefit from a low but significant level of restraint to resist lateral torsional buckling and also that girders that are marginally non-compact based on codified assessment methods may actually have sufficient local stability to provide additional flexural capacity beyond the elastic moment capacity.

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More information

Accepted/In Press date: 1 February 2016
e-pub ahead of print date: 10 March 2016
Published date: 1 May 2016
Keywords: bridges/field testing, monitoring, bridges, buildings, structures & design, field testing & monitoring
Organisations: Infrastructure Group

Identifiers

Local EPrints ID: 406353
URI: http://eprints.soton.ac.uk/id/eprint/406353
PURE UUID: c9f9db4b-4768-4453-9fd3-dee108c36b95
ORCID for Mohammad Mehdi Kashani: ORCID iD orcid.org/0000-0003-0008-0007

Catalogue record

Date deposited: 10 Mar 2017 10:45
Last modified: 26 Nov 2019 01:27

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Contributors

Author: Lee Canning

University divisions

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