Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Gade Valley Viaduct: Management and Resolution of a Critical Fatigue Life Shortfall
Gade Valley Viaduct is a multi-span composite multi-box girder viaduct of total length 440 m that on completion in 1986 formed the final link in the M25 orbital motorway around London, UK, and now carries around 200 000 vehicles per day. Severe theoretical fatigue life shortfalls have been identified in the critical bottom flange areas in tension where the flange plate is only 8 mm thick and vulnerable to small cracks.
This paper describes the management strategy, detailed assessment and rehabilitation design employed to keep the structure safe and open to traffic while returning the structure to a robust state which is fit for the future. Substantial innovation was necessary in the assessment to minimise the extent of the required intervention including location-specific fatigue assessment using panel distortion measured by laser scanning and strain gauge monitoring to measure actual stress cycles. The design of the strengthening required the assessment of fatigue life-expired details under revised loading to determine the tolerance of past damage, and weld treatment by plasma dressing to eliminate past damage where tolerance of damage could not be established. An extensive programme of non-destructive testing and inspection has been used to assure safety during the implementation of the strengthening scheme.
Gade Valley Viaduct: Management and Resolution of a Critical Fatigue Life Shortfall
Gade Valley Viaduct is a multi-span composite multi-box girder viaduct of total length 440 m that on completion in 1986 formed the final link in the M25 orbital motorway around London, UK, and now carries around 200 000 vehicles per day. Severe theoretical fatigue life shortfalls have been identified in the critical bottom flange areas in tension where the flange plate is only 8 mm thick and vulnerable to small cracks.
This paper describes the management strategy, detailed assessment and rehabilitation design employed to keep the structure safe and open to traffic while returning the structure to a robust state which is fit for the future. Substantial innovation was necessary in the assessment to minimise the extent of the required intervention including location-specific fatigue assessment using panel distortion measured by laser scanning and strain gauge monitoring to measure actual stress cycles. The design of the strengthening required the assessment of fatigue life-expired details under revised loading to determine the tolerance of past damage, and weld treatment by plasma dressing to eliminate past damage where tolerance of damage could not be established. An extensive programme of non-destructive testing and inspection has been used to assure safety during the implementation of the strengthening scheme.
Gade Valley Viaduct: Management and Resolution of a Critical Fatigue Life Shortfall
Bonnett, Joanna (Autor:in) / Percy, Robert (Autor:in) / Robinson, Peter (Autor:in) / Hardy-Bishop, Phil (Autor:in) / Singh, Santosh (Autor:in) / Hughes, Derek (Autor:in) / Nicholls, Tony (Autor:in)
Structural Engineering International ; 29 ; 570-574
02.10.2019
5 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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