Trezzo sull'Adda Bridge

Template:Short description Template:Template other The Trezzo sull'Adda Bridge or Trezzo Bridge was a medieval bridge at Trezzo sull'Adda in Lombardy, Italy, spanning the Adda river. Completed in 1377, the single-arch bridge held the record for the largest span for over four hundred years, until the beginnings of the Industrial Age,Template:SfnpTemplate:SfnpTemplate:SfnpTemplate:Sfnp while it was not until the early 20th century that masonry bridges with larger openings were constructed.Template:Sfnp

History

The Trezzo Bridge was built between 1370 and 1377 by order of the lord of Milan Bernabò Visconti.Template:Sfnp Fortified with towers, it provided access to the Visconti Castle high above the Adda.Template:Sfnp During a siege in 1416, the condottiero Carmagnola deliberately caused the structure to collapse by weakening one of its abutments.Template:Sfnp

Its single arch featured a span of ,Template:SfnpTemplate:SfnpTemplate:SfnpTemplate:SfnpTemplate:Sfnp according to other sources even as much as .Template:Sfnp By comparison, the second largest pre-industrial bridge vault, the French Pont de Vieille-Brioude, spans .Template:Sfnp The rise of the segmental arch was ca. , with a span-to-rise ratio of 3.3:1.Template:Sfnp The arch rip, measured at the springing, was thick,Template:Sfnp corresponding to a favourable ratio of rib thickness to clear span of only 1/32. The sandstone bridge was almost wide.Template:Sfnp Today, the two abutments with overhanging remnants of the arch vault are all that remain.Template:Sfnp

The Trezzo Bridge was not matched until the metal Wearmouth Bridge of the same span was built at Sunderland, England, in 1796.Template:Sfnp Longer masonry arch spans were not achieved until the 1903 Adolphe Bridge in Luxembourg.Template:Sfnp

File:Castello di Trezzo1.JPG

The Trezzo sull'Adda Bridge provided access to the Visconti Castle over the Adda. At the left-hand side, one abutment with remnants of the sharply rising arch vault is visible.

See also

• Pont de Vieille-Brioude (54 m span)
• Pont Grand (Tournon-sur-Rhône) (49.2 m span)
• Castelvecchio Bridge (48.7 m span)
• Pont du Diable (Céret) (45.45 m span)
• Nyons Bridge (40.53 m span)
• Puente de San Martín (Toledo) (40 m span)
• Ponte della Maddalena (37.8 m span)
• Pont del Diable (37.3 m span)
• Dyavolski most (13 m span)

External links

• Trezzo sull'Adda Bridge at StructuraeTemplate:EditAtWikidataTemplate:WikidataCheck
• Lombardia Beni Culturali – Ponte fortificato (ruderi), Trezzo sull'Adda (MI)