CROSS Safety Report
Fatigue failure of bridge cross-girder
Overview
During a planned examination of a bridge, a cross-girder was found to have failed via fatigue.
Key Learning Outcomes
For asset owners and managers:
- Regular inspections and maintenance can help keep a structure safe before it deteriorates and requires costly repairs
- Be aware that safety-critical defects may be hidden behind linings and connection plates
- The risks posed by hidden defects should be managed appropriately. Hidden Critical Element (HCE) inspections should be carried out by suitably qualified and experienced personnel.
- Further guidance can be found in CIRIA document: Hidden defects in bridges. Guidance for detection and maintenance (C764)
For civil and structural design engineers:
- Careful consideration should be given to the fatigue design of safety critical structures such as bridges
Full Report
Find out more about the Full Report
The Full Report below has been submitted to CROSS and describes the reporter’s experience. The text has been edited for clarity and to ensure anonymity and confidentiality by removing any identifiable details. If you would like to know more about our secure reporting process or submit a report yourself, please visit the reporting to CROSS-UK page.
During a planned examination of a bridge, a cross-girder was found to have failed via fatigue. According to the reporter, it is likely that the fatigue crack formed behind the connecting gusset plate to the main girder from a stress point at the top of the web.
The fatigue crack would be undetectable as it was hidden by the connecting gusset plate. The remaining section of the web and bottom flange then failed through shear, causing the girder to drop by around 15mm. Fatigue may have been exacerbated by the end bearing deflection of the main girder.
Submit a report
Your report will make a difference. It will help to create positive change and improve safety.
Our secure and confidential safety reporting system gives professionals the opportunity to share their experiences to help others.
Feedback
No feedback has yet been published for this page.
Expert Panel Comments
Expert Panels comment on the reports we receive. They use their experience to help you understand what can be learned from the reports. If you would like to know more, please visit the CROSS-UK Expert Panels page.
There are no Expert Panel comments on this report. The Expert Panels are only asked to comment on selected reports. These are normally reports where there is an opportunity for them to help you understand what can be learned from the report.