Viaduct SS335 (analysis)
A detailed assessment of the condition of an object.
Properties
Element type
:
Analysis
Summary
:
During the strenghtening works the clinometers raw data were analyzed to evaluate the plastic deflection recovery after the external pre-stressing was applied to the deck. Vibration-based damage detection techniques were used to identify the changes in the dynamic response of the system, such as Operational Modal Analysis (OMA) techniques, Power Spectral Density (PSD) and Frequency Domain Decomposition (FDD). A stable peak-picking analysis has been performed to track the natural frequencies evolution in the long-term period. Non-Linear Finite Element Analysis (NLFEA) and a model updating procedure were used to simulate the bridge behavior both in damaged and strengthened state. The FE model was also used to simulate a set of possible damaged scenarios to calculate the thresholds in terms of plastic rotations and frequency shifts for the long-term monitoring.
Case type
:
Consulting
Initiation of assessment
:
Monitoring
Predominant verification type
:
Design value criteria
Predominant verification scale
:
Structural system
Structural analysis
:
Model updating procedures and description of damage scenarios used to define thresholds based on reliability considerations
Physical intervention
:
Strengthening or upgrading
Operational intervention
:
Maintenance, Monitoring