Concrete frame viaduct over national road no. S3 occurred to be to week under the dead load just after construction. Several investigations and concept works were done to develop a final way of strengthening. Finally span was reinforced by additional steel plates bolted to the bottom part and two concrete ribs placed instead of crash barriers on the road. Designed strengthening was fully implemented and several tests were performed to proof a final capacity of viaduct. Results of testing and conclusions are included.
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