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King Charles Bridge - Structural Assessment

Surbiton, Kingston-upon-Thames

VEDA undertook an assessment of the metallic elements of a road bridge spanning a four-track rail line between London and Guildford.

The masonry arch bridge in King Charles Road, Surbiton, southwest London, was already subject to vehicle access restrictions and three-tonne load capacity. Bollards were in situ to protect non-carriageway elements and, ultimately, prevent vehicles loading the pavement structure. 

VEDA was contracted to investigate the capacity of the wrought iron pavement support elements located either side of the road bridge, which is owned by Network Rail (NR).

Following investigation and analysis of the structure’s elasticity and load bearing capacity under Level 1 Assessment criteria to BS5400, VEDA proceeded to a Level 2 Assessment. Designed to appreciate stress in elements of the bridge through nonlinear analysis, the second assessment indicated that despite deformation of the pedestrian support structure, load bearing capacity remained sufficient. 

The bridge’s current profile was presented using different colours to demonstrate deformation levels. Once modelled, VEDA engineers were able to confirm if those deformations remained within the design limits. It also enabled an elemental review of the structure, upon which informed decisions could be made as to where to strengthen the pedestrian support, and where not to. 

VEDA provided a strength proposal to increase bridge’s capacity to seven tonnes and identified improvements that could be made to allow a greater load capacity than its current standard. 

The bridge falls under the jurisdiction of both NR and the Highways Agency and, as such, they have a shared responsibility for assuring it is adequate for pedestrian and vehicle use.


Project Details:

Project Name: King Charles Bridge
Type of Project: Structural Assessment
Client: B & M McHugh
Date completed: July 2016


Services Provided:

  • Structural Assessment
  • Rail Engineering

 
 
 

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