Bearing replacements for Forth Road Bridge approach viaducts, London

25 April, 2016 | 18:00 - 20:30

Bearing replacements for Forth Road Bridge approach viaducts, London

About this event

The existing Forth Road Bridge spans the Firth of Forth in Scotland. The main suspension bridge, with central span of 1006 m, has two multi-span approach viaducts leading up to the main crossing.

The deck of the approach viaducts comprises a pair of longitudinal steel box girders supporting a series of transversely spanning steel girders, both acting compositely with a reinforced concrete deck. The steel girders of the approach viaducts are supported on steel roller and rocker bearings on concrete portal piers which vary in height between 11 m and 40 m.

An initial study of the bearings identified that the rollers had locked up due to corrosion and distortion, and the concrete beneath the bearings and elsewhere on the pier tops had deteriorated due to chloride contamination.

Assessment showed that structural deficiencies in the pier were exacerbated by both the concrete deterioration and change in articulation. These factors led to the decision to replace all the bearings on the viaducts.

The presentation, based on the award winning paper, will cover:

  • The considered bearing replacement options
  • The assessment of box girders and piers, as built
  • Solutions for bearing replacement - corbels and steelwork
  • Cathodic protection


18:00 Registration and refreshments
18:30 Welcome from the Chair
18:35 Main lecture
19:15 Questions and answers session 
19:35 Summation from the Chair
19:40 Drinks reception
20:30 Finnish

Delegates can access the paper online prior the event.

Event materials

The following materials are available for download:


Chris Hendy

John Beswick
Chris Hendy, Atkins Fellow and Head of Bridge Design and Technology

Chris is an Atkins Fellow and Head of Bridge Design and Technology. He is Chairman of the UK BSI bridge committee, Chairman of the UK’s Steel Bridge Group and Chairman of fibUK. He is a member of the CEN Working Groups looking after the next generation of steel and steel-concrete bridge Eurocodes.

In 2012 he was awarded the Royal Academy of Engineering Silver Medal and was elected a Fellow of the Royal Academy in 2013. In recent years Chris has led some of Atkins’ most complex award winning bridge projects including the design and construction supervision of the cable replacements of the 225 m span cable stayed Penang Bridge (Malaysia), the design of the 152 m span balanced cantilever New Medway Road Bridge, the design of the 67 km long Dubai Metro Viaducts, the bearing replacements and strengthening for the Forth Road Bridge and the main cable management of the Severn Suspension Bridge.

Dr Ana M Ruiz-Teran​

John Beswick
Dr Ana M Ruiz-Teran,  Lecturer in Structural Engineering

Dr Ana M Ruiz-Teran is a Lecturer in Structural Engineering at the Department of Civil and Environmental Engineering at Imperial College London. Her teaching, research and professional experience are focused on the area of Bridge Engineering. She was graduated at the University of Cantabria, Spain, as Ingeniero de Caminos, Canales y Puertos (6-year MEng in Civil Engineering), specialized in Structural Engineering, with Matrícula de Honor, being awarded the First National Prize for the Top Spanish Graduate in Civil Engineering. She spent more than five years working in industry for the companies Apia XXI, and Arenas y Asociados, Ingenieria de Diseño, as a chartered bridge engineer, being involved in the design and construction of many singular bridges. She completed a PhD on innovative types of cable-stayed bridges at the University of Cantabria, with Sobresaliente Cum Laude, being awarded with the prize for the best PhD in Engineering at this institution. She wasawarded the FIB Diploma 2009 for Research. Her academic career started at the University of Castilla-La Mancha, Spain, as teaching assistant, and, after completing a post-doctoral research period at Imperial College London, she was appointed Principal Lecturer at the University of East London. In 2011 she was appointed Lecturer at Imperial College London.

Her teaching experience includes both undergraduate and postgraduate courses in structural engineering. Her main research interests are related to the structural response and design criteria of innovative bridge types (such as under-deck and combined cable-stayed bridges, curved and spatial arch-bridges, and cable-supported bridges), the accidental breakage of stay cables, and the dynamic response of slender road bridges and footbridges under live load. She is also Chartered Member of the Institution of Civil Engineers, Corporate Member of the Spanish Institution of Civil Engineers (Colegio de Ingenieros de Caminos, Canales y Puertos), and member of several international scientific and technical associations (such as IABSE, IASS, FIB, and ACHE).