The Colombo bridge was built across the Mannu river in Sardinia, (Italy) between 1966-68. This bridge consists of 15 spans, each 15 m in length, 12 of these span the Mannu river and 3 span a railway. The bridge deck is constructed out of precast pretensioned concrete I-beams, 0.80 m spacing with overlaid precast parts. It is based on a continuous pier cap, which is supported by 4 piers, each made of 2 circular columns. Continuous foundation beams distribute loads down to 0.60 m reinforced concrete piles. In 1992 serious static damage was identified and the 2 circular columns were connected together, thus becoming a unique structure. In 2002 due to increased heavy traffic, serious static risk and serious deterioration of the building materials, a total renovation of the structure including all structural aspects, from bridge deck to foundation piles was undertaken. Core samples of the concrete from the piers and foundation were examined and reinforcing rebars mapped, direct load testing on the foundation piles were also carried out. The renovation project, the extensive non destructive experimental tests and the testing of the load carrying capacity of the piles are disclosed in the following report.
Estensive Restoration of the Colombo Bridge (Sardinia)
DE NICOLO, BARBARA;MISTRETTA, FAUSTO;
2003-01-01
Abstract
The Colombo bridge was built across the Mannu river in Sardinia, (Italy) between 1966-68. This bridge consists of 15 spans, each 15 m in length, 12 of these span the Mannu river and 3 span a railway. The bridge deck is constructed out of precast pretensioned concrete I-beams, 0.80 m spacing with overlaid precast parts. It is based on a continuous pier cap, which is supported by 4 piers, each made of 2 circular columns. Continuous foundation beams distribute loads down to 0.60 m reinforced concrete piles. In 1992 serious static damage was identified and the 2 circular columns were connected together, thus becoming a unique structure. In 2002 due to increased heavy traffic, serious static risk and serious deterioration of the building materials, a total renovation of the structure including all structural aspects, from bridge deck to foundation piles was undertaken. Core samples of the concrete from the piers and foundation were examined and reinforcing rebars mapped, direct load testing on the foundation piles were also carried out. The renovation project, the extensive non destructive experimental tests and the testing of the load carrying capacity of the piles are disclosed in the following report.
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