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At which condition the splicing of the reinforcement bars in R.C.C. beams is required?

At which condition the splicing of the reinforcement bars in R.C.C. beams is required? Correct Answer <p>if bending moment is zero</p>

Explanation:

Splicing

  • The method used to join the reinforcement bars, so that the force is transferred effectively from one bar to the other is called splicing.
  • Force is first transferred to the concrete through a bond from one bar and then it is transferred to the other bar forming the splice through the bond between it and concrete. 
  • If the bending moment is zero, then the splicing of the reinforcement bars in R.C.C. beams is required

Method of reinforcement splicing

  1. Lap Splice
  2. Mechanical Splice
  3. Welded Splice

According to IS 456:2000, Cl.26.2.5,

  • The splicing of flexural members should not be at sections where the bending moment is more than 50% of the moment of resistance, and not more than half the bars shall be spliced at a section.
  • Where more than one-half of the bars are spliced at a section or where splices are made at points of maximum stress, special precaution should be taken, such as increasing the length of lap and/or using spirals or closely-spaced stirrups around the length of the splice.

Important Points

As per IS 456:2000:

a) Lap splices shall not be used for bars larger than 32 mm diameter; for larger diameters, bars shall be welded or mechanically spliced.

b) Lap length including anchorage value of hooks in flexure tension shall be equal to development length but not less than 30 times the diameter of smaller bar.

c) Lap length including anchorage value of hooks in direct tension shall be equal to two times the development length but not less than 30 times the diameter of smaller bar.

d) Lap length in compression shall be equal to development length in compression but not less than 24 times the diameter of a smaller bar.

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