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Reinforcement details for ductility
Mon Jul 22, 2013Total posts : 2
shivakumar
shivakumar
Join date: Jan 2013
 Topic: Reinforcement details for ductility
sir,


Sir we are constructing an govt building in  Vapi Gujarath its comes under Seismic zone, so we providing an Fe500D(ductile) steel and  the 50% lapping of must be we have an single floor height is (3.4mts) so for that from basement floor Ist floor it may getting 7.8 mts ,Its not possiable to put such long rod so please give ur vauable suggestion for us.


                         Thanking you

Shiva kumar

Sr.Engg

+917818880602
Mon Jul 22, 2013Post  #1
S L Gupta (Civil Engg)
S L Gupta (Civil Engg)

Join date: Mar 2008		Dear Kumar
             Your query is not clear. As for my opinion You want to know about lap in Steel bars.The lap should be as under

There should be no joints in steel bars used for RCC work. If it is necessary to use small length steel bars, proper overlap should be given.

The joints of bars should  be welded in case the diameter of bars is more than 36 mm. Overlapping of bars should not touch each other and they should be kept apart. Where it is not possible, overlapping bars should be bound together at intervals not exceeding twice the diameter of such bars with two strands of steel wires trusted tight. The overlap should be staggered for different bars. The length of overlap should not be less than 50 times the diameter of steel bar.

http://www.gharexpert.com/articles/Steel-1021/Type-Steel-Bars_0.aspx

http://www.gharexpert.com/articles/Cement-Concrete-1730/Mild-Steel-Bars-in-Cement-Concrete_0.aspx

 


 
Mon Jul 22, 2013Post  #2
Rudra Nevatia
Rudra Nevatia

Join date: May 2013		Shivakumar:

Clause 7.2.1 of IS 13920:1993 states as follows:

Lap splices shall be provided only in the central half of the member length. It should be proportioned as a tension splice. Hoops shall be provided over the entire length at spacing not exceeding 150 mm c/c. Not more than 50% of the bars shall be spliced at a section.

So, it follows that, in the present case bars may be spliced within the central 1.7 m  of column. You may stagger splices within this length.

Regards,
Rudra Nevatia

 

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