Monitoring of traffic action local effects in highway bridge deck slabs and the influence of measurement duration on extreme value estimates

Abstract

In recent years, monitoring has offered a viable complement or even alternative to traditional analytical safety verification approaches. However, there still remains a lack of guidance for the use of monitored data in safety verification work. Limited resources often necessitate relatively short time frames for safety verification of problematic bridges. While the duration of monitoring is always an important consideration, it is rarely examined explicitly in terms of its influence on the predicted characteristic action effects. This work gives a novel approach for determining if a monitoring regime is sufficiently long to obtain a reliable extreme value estimate of the action effect. A case study of a highway bridge in Switzerland, with one year of continuous high-frequency measurements, is used to exemplify the approaches developed. The focus is on direct measurement of the traffic action effects in the bridge's deck slab reinforcement. A comprehensive statistical approach for determination of site-specific, element-specific extreme traffic action effects is presented.

Keywords::

• existing bridge examination
• extreme loading
• monitoring duration
• structural safety verification

Acknowledgements

The authors express their gratitude for the financial support provided by the European Commission 7th Framework Project, TEAM (PITN-GA-2009-238648). They are also grateful to the Swiss Federal Roads Authority for the opportunity to monitor the bridge presented in this study.

Notes

^1. Email: [email protected]

^2. Email: [email protected]