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For column reinforcements, why is helical reinforcement sometimes designed instead of normal links?

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The use of links for column design in Britain is very popular. However, in U.S.A. engineers tend to use helical reinforcement instead of normal links because helical reinforcement has the potential advantage of protecting columns/piles against seismic loads.

Moreover, when the columns reach the failure state, the concrete outside hoops cracks and falls off firstly, followed by the eventual failure of the whole columns. The peeling off of concrete outside helical reinforcement provides a warning signal before the sudden failure of columns as suggested by G. P. Manning (1924). In addition, it can take up a higher working load than normal link reinforcement.

For instance, helical reinforcement is adopted in the design of marine piles in Government piers.

Note: Helical reinforcement refers to shear reinforcement which is spiral in shapes.

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This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

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Comments
  • sivakumar November 13, 2010 at 12:08 am

    what is advantage of helical reinforcement in column.

  • Bhaskara Ramesh Veluri June 2, 2011 at 2:15 am

    when do we build shear walls in Multistoried buildings? What is the minimum height of the building above GL for adopting shearwall concept?

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