Highway Straightening Structure (4th) between Lasarte and Andoaín

Abstract

This article describes the concept, design and analysis of a continuous concrete, capped type, overpass, prestressed with a 56° skewing angle. This article includes considerations regarding the savings in prestressed steel as a result of the skewing as compared to that which would have been produced by using a reinforced concrete slab, and on the structural prestress effects contemplated as a voluntary compensating action of external loads as well on the size of the passive reinforcement required for cutting and torsion stresses. It discusses the resistant mechanisms developed in a panel of this type and it points out relatively simple analysis procedures of same, subjected to lads which are normal on its plane and of obtention of horizontal action on piles caused by the forces and deformations imposed in same. Finally, construction aspects such as the solution adopted to eliminate bench walls, which can be of a practical interest, are detailed.