Stress analysis during the construction phase
Measurements were taken between ribs R14 and R14’ with an evenly distributed loading and at ribs R22 and R22’ with selective loading.
This checked the actual longitudinal and transverse deformation of the bridge. The conformity between the computer model and the construction was also checked to verify the structure’s effective rigidity.
To capture the data around forty XY71-3/120 strain gages were installed with two measuring grids offset by 90°. The adhesive used was two-component X60 adhesive with a composite material with an aluminum layer, ABM 75, acting as the covering agent.
Because of the length of the bridge, the measuring points were connected in a 6-wire circuit, which excluded measurement error as a result of voltage loss in the cables.
The MGCplus amplifier system with ML801 and AP815i modules were also used. Because of the high atmospheric humidity, the biggest challenge was choosing the right adhesives and protective materials, as well as laying the cables.
The data was recorded for about a week by catman®Professional software and delivered excellent results.