Analysis, Design and Construction of Two Extremely Skewed and Slender Post-Tensioned Concrete Bridges (original) (raw)

The paper summarises the main issues found in the design, construction and launching of two large and highly skewed post-tensioned concrete slabs built along the A4 motorway connecting Milan and Turin. The twin slabs (one for each carriageway) are characterised by a very high skew (61°) and a record spanto-thickness ratio. Introducing the edge beams does change the reactions at the 5 + 5 equally spaced bearings. Nonetheless, the increase of the vertical reaction at the obtuse corner is almost insignificant and it was further reduced by introducing suitable distortions. This has a positive effect on the slab stresses because the strength of the slab at the obtuse corner with the edge beam is much more compared to the same slab without edge beams. To further increase shear and torsional strength at the obtuse corner, the edge beams shaped like an inverted L along most of the span, become rectangular closer to the above mentioned supports.