Viaduct SS335 (object state)
A condition of an object at a particular time, reflecting the object's ability to fulfil it's requirements.
Properties
Element type
:
Object state
Summary
:
Following an inspection, some cracks were found at the inner surface of the slab, due to the failure of a significant number of pre-stressing tendons caused by a diffuse corrosive phenomenon. Strengthening works were necessary, the solution chosen was the adoption of an external pre-stressing system. The Sacertis SHM system installed in April 2019 was developed for both the short and long-term monitoring. Each span is equipped with a chain made by five biaxial MEMS clinometers and five triaxial MEMS accelerometers. The system is completed by two gateways, one per carriageway and a power line communication to connect all the devices to the network. In each sensor box are present a temperature and humidity detectors. Prior information available were: drawings, design documents, results of thorough investigation of the damaged span. A calibrated non-linear FE model based on the static load test and dynamic characterization of the structural response (in both the damaged state and after the strenghtening works) has been used to determine the warning and alarm thresholds levels.
Prior information
:
Design standards, Drawings, Design documents, Previous inspections, Monitoring data, Numerical models
Performance indicator
:
Deformation, Displacement, Dynamic response (acceleration/damping/frequencies), Material mechanical properties, Cracks (width/length/pattern)
Inspection method
:
IoT and sensor systems
Relations with other elements
The inspection method used in this case study to determine the object state was "IoT and sensor systems". This can include any of the following surveying technologies. Click one of the links below for more information:
IoT and sensor systems