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Cantilever-spar Cable-stayed Bridge

Puente del Alamillo
Ancestor	Cantilever bridge, cable-stayed bridge
Related	Side-spar cable-stayed bridge
Descendant	None
Carries	Pedestrians, Light Rail
Span range	Short to Medium
Material	Steel, prestressed concrete
Movable	One example can swing
Design effort	High
Falsework required	No

A cantilever spar cable-stayed bridge is a modern variation of the cable-stayed bridge. This design has been pioneered by the structural engineer Santiago Calatrava in 1992 with the Puente del Alamillo in Seville, Spain. In two of his designs the force distribution does not depend solely upon the cantilever action of the spar (pylon); the angle of the spar away from the bridge and the weight distribution in the spar serve to reduce the overturning forces applied to the footing of the spar. In contrast, in his swinging Puente de la Mujer design (2002), the spar reaches toward the cable supported deck and is counterbalanced by a structural tail. In the Assut de l'Or Bridge (2008), the curved backward pylon is back-stayed to concrete counterweights.

Of this type by Santiago Calatrava

• Puente del Alamillo, Seville, Spain, 1992 (backward cantilever)
• Trinity Bridge, Manchester, United Kingdom, 1995 (backward cantilever)
• Puente de la Mujer, Buenos Aires, Argentina, 2002 (forward cantilever with gate-swing opening)
• Sundial Bridge at Turtle Bay, Redding CA, USA, 2004 (backward cantilever with glass decking)
• Chords Bridge, Jerusalem, Israel, opened 2008, light rail operative since 2011 (single-sided angled cantilever side-spar)
• Assut de l'Or Bridge, Valencia, Spain, opened 12 December 2008 (backward curved pylon, back-stayed cantilever)
• Samuel Beckett Bridge, Dublin, Ireland, opened 10 December 2009 (single-sided forward curved back-stayed pylon, evoking a harp)
• Ponte di San Francesco da Paola, Cosenza, Italy, opened 26 January 2018 (backward pylon)
• Signature Bridge, New Delhi, India, opened 4 November 2018 (Asymmetrical cable stayed pylon bridge)

Others of this type

• Puente Atirantado (sometimes called Puente de la Unidad or Viaducto de la Unidad), opened in 2003, is a cable-stayed bridge that crosses the Río Santa Catarina and joins San Pedro Garza García with Monterrey. Although impressive and elegant, its construction was highly controversial due to its cost, its design (very similar to the one by Santiago Calatrava), and the fact that the river it crosses is dry.
• Mariánský most – in Ústí nad Labem, Czech Republic. (1998)
• Erasmusbrug – by Ben van Berkel, in Rotterdam Netherlands.
• Signature Bridge, Delhi, India, opened 5 November 2018.(Unique design of cables in a combinations of radial and semi-harp arrangement)

• 
  Puente de la Mujer, Puerto Madero ( Argentina)
• 
  Assut de l'Or Bridge, Valencia, Spain
• 
  Ponte di San Francesco da Paola, Cosenza, Italy
• 
  El Puente Atirantado. Monterrey, Mexico
• 
  Samuel Beckett Bridge, Dublin, Ireland
• 
  Mariánský most, Ústí nad Labem, Czech Republic

See also

• Bridge – A directory of bridge types
• Cable-stayed bridge – The ancestor of this type
• Side-spar cable-stayed bridge – A related type

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