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What are the reasons for establishing minimum distance between bars and maximum distance between bars?

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In some codes, a minimum distance between bars is specified to allow for sufficient space to accommodate internal vibrators during compaction.

On the other hand, the restriction of maximum bar spacing is mainly for controlling crack width. For a given area of tension steel areas, the distribution of steel reinforcement affects the pattern of crack formation. It is preferable to have smaller bars at closer spacing rather than larger bars at larger spacing to be effective in controlling cracks. Hence, the limitation of bar spacing beyond a certain value (i.e. maximum distance between bars) aims at better control of crack widths.

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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
  • H.T. Nair November 25, 2012 at 2:47 am

    hi ,
    kindly provide the details of test which are conducting while finding cracks, in walls ,slabs and floors etc in building structure.

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