# Centenario Bridge (analysis)

A detailed assessment of the condition of an object.

## Properties

Element type

:

Analysis

Summary

:

"The solution adopted to know the force of the stay cables at any moment is based on dynamic instrumentation with accelerometers. The total amount of sensors is 120. In addition to other complementary sensors, each of the 88 cables has an accelerometer continuously monitored at a rate of 100 readings per second. A volume of 900 million data is generated daily.

With this amount of data, two parallel processes are carried out in real-time:

- Statistical analysis, which provides the minimum, average, maximum, and RMS acceleration levels in intervals of 3 seconds (short span) and 10 minutes (long span).
- Spectral analysis, which provides the main vibration frequency of each stay cable (and, immediately, the force) obtained from the application of the FFT (Fast Fourier Transform) together with a special algorithm developed for this purpose.

Both processes take place at the bridge, automatically and without any human intervention.

The measured values of the cable forces feed the structural model of the bridge, allowing decision making."Case type

:

Consulting

Initiation of assessment

:

Required reliability check, Structural deterioration, Other

Predominant verification type

:

Engineering judgement

Predominant verification scale

:

Damage/deterioration location

Structural analysis

:

Ultimate limit state, Fatigue limit state, Proxy limit state

Information updating

:

Direct bayesian

Physical intervention

:

Repair

Operational intervention

:

Monitoring

## Relations with other elements

Other initiation of assessment is: Corrosion in the stay cables

Proxy limit state (e.g. corrosion initiation)