Completed in 2005, this is the first steel bridge in the Spanish High-Speed Railway (HSR), included in the section between Barcelona and the French Border. The 1,883 ft (574 m) long Llinars HSR bridge comprises two parts: a 1,008 ft (307 m) long steel–concrete structure crossing the highway and a continuous prestressed concrete box girder over the Mogent River with a maximum span of 157 ft (48 m).
The location of the piers was controlled by the highly skewed angle of the highway crossing and by the launching process used to erect the bridge. The steel bridge is a king post truss with curved diagonals. The truss supports a composite steelconcrete deck. The 56 ft (17 m) wide bridge accommodates two ballasted tracks on a 46 ft (14 m) wide deck. The steel bridge is a continuous structure with five spans measuring 148 ft (45 m), 233 ft (71 m), 246 ft (75 m), 233 ft (71 m) and 148 ft (45 m), respectively. The concrete–steel deck consists of 3 ft (1 m) deep transverse steel plate I-beams that are positioned 11 ft (3.55 m) apart. The transverse floor beams are connected to the bottom chord that is a 5 ft (1.6m) wide box section with variable depth between 11 and 19 ft (3.5 to 6 m).
Design was carried out meeting the Eurocode requirements, including strict provisions related to the dynamic behavior and rail-structure interaction given the complexity of HSR bridges. The design of this bridge achieved a cost-effective and aesthetically pleasant solution through the optimal use of materials, including steel and slender decks.To avoid interfering with the operation of Barcelona´s critically important tollway AP-7, incremental launching construction was used for the steel bridge.
J.A. Sobrino – Moving at the speed of steel. Civil Engineering Magazine, Volume 78, Number 4 pp. 69-75. ASCE, April 2008.
J.A. Sobrino – Two steel bridges for the high speed railway line in Spain. WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Stahlbau, vol 79, issue 3, pp. 181-187, March 2010.