Rigorous assessment of existing overhead line gantries for the Elizabeth line

Author: S. Fryer, M. Couchman and T. Eckhart (all BuroHappold Ltd)

Date published

2 July 2018

Price
Free
Access Resource
Back to Previous

Rigorous assessment of existing overhead line gantries for the Elizabeth line

The Structural Engineer
Author

S. Fryer, M. Couchman and T. Eckhart (all BuroHappold Ltd)

Date published

2 July 2018

Author

S. Fryer, M. Couchman and T. Eckhart (all BuroHappold Ltd)

Price

Free

Access Resource

This paper describes a rigorous analysis approach that was used to assess the suitability of existing overhead line equipment (OLE) gantries for the Elizabeth line (Crossrail) scheme, resulting in significant programme and cost savings, as well as sustainability benefits.

Synopsis

The Elizabeth line will use above-ground sections of existing Great Eastern and Great Western tracks between Stratford and Maidenhead where new overhead line equipment (OLE) and traction power supply will be installed.

The OLE is supported by gantries of various types and configurations. In the case of the Great Eastern, the gantries date from the electrification of UK railways in the 1940s.

Initial structural assessment carried out had shown that existing gantries on the route were inadequate to carry increased loading from the upgraded OLE. However, a rigorous procedure incorporating detailed non-linear structural analysis was developed that eliminated some of the inherent conservatism in traditional codified approaches. Particular benefit was found in the case of the many types of slender structure where buckling was a governing factor. Using non-linear techniques, it was possible to demonstrate that families of structures were suitable for incorporation in the Crossrail (Elizabeth line) scheme.

This paper describes the approach that was used. The project is remarkable for significant programme and cost savings that were accomplished using sophisticated engineering analysis. It is also noteworthy from a sustainability point of view, as it allowed the existing infrastructure to be reused.

Additional information

Format:
PDF
Pages:
5
Publisher:
The Institution of Structural Engineers

Tags

Transport & its Infrastructure Climate change Assessment of Structures Construction management Structural analysis Issue 7

Related Resources & Events

The Structural Engineer
<h4>What can you do if you are convinced a structure will work but can’t prove it to code?</h4>

What can you do if you are convinced a structure will work but can’t prove it to code?

The article explores ways to justify reuse of existing structures through a thorough understanding of the original building structure, and engineer’s intent.

Date ‐ 1 June 2021
Author ‐ Jessica Foster
Price ‐ £9
Guidance
<h4>Appraisal of existing structures (Third edition)</h4>

Appraisal of existing structures (Third edition)

Comprehensive, step-by-step guidance for structural engineers needing to check and report on the adequacy of an existing structure.

Date ‐ 1 October 2010
Author ‐ Various (Institution Task Group)
Price ‐ £32.50/£42.25/£65.00
The Structural Engineer
<h4>Analysing existing structures: a brief introduction</h4>

Analysing existing structures: a brief introduction

This article discusses the analysis and modification of existing structures for new uses, allowing return on investment to be maximised and reducing the need for present-day carbon emissions from new construction.

Date ‐ 1 June 2021
Author ‐ Mathai Mathew
Price ‐ £9