Arcos de Alconétar Viaduct (analysis)
Properties
The phenomenon produced considerable damage at intermediate sections of the arch. The movement was an antimetric vibration of the arch in its plane with a frequency of 0, 70Hz (second mode).
A dynamic data acquisition system was installed and more than 2.600 wind events were recorded between February and June 2006. Aerodynamic deflectors were installed (see picture below).
They proved to be very effective in suppressing or reducing the formation of vortexes.
However, It was decided to keep the dynamic monitoring system with the bridge opens to traffic to survey the structural behavior under the wind action. The opportunity was taken to obtain information regarding joint movements and other environmental actions.
The total amount of sensors is 54 (thermometers, anemometers-vanes, accelerometers, and lasers for joint displacements)."Relations with other elements
Other initiation of assessment: Verification of the correct structural behavior due to the vibration problem detected during construction.
Other physical intervention: Physical intervention (strengthening/Upgrading) will only be considered if the structural behavior during working life is found to be not suitable.