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reinf. detailing

 
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nagaraju_pogula
SEFI Member
SEFI Member


Joined: 26 Jan 2003
Posts: 9

PostPosted: Thu Apr 03, 2003 9:39 am    Post subject: reinf. detailing Reply with quote

Dear friends,

I am relatively new to field of structural engg. I have a few queries and request help from my learned colleagues of this field:

1)      I have a situation where I have to substitute the existing longitudinal bars of columns of dia 28 tor which are not available in the market with bars of some other dia. like 32,25,20 etc. Now splicing is to be done in the ground floor (plinth beams were cast). The 28 tor bars are provided upto-splicing zone of the ground floor columns. (16 no-28 Tor). Can I substitute 16no.-28 Tor  with  8no-32 tor plus 8no-25 tor which gives little more area than required. If this arrangement is permitted, what splice length I have to provide for 28/32 lapping? Should it be as required for 28 dia or for 32 dia.

2)      We are planning a riser-less staircase with a central stringer beam. Consequently only a tread slab (step) with over-hang on both sides of stringer beam is required to be provided .The reinforcement detailing of the junction of stringer beam and tread slab is given in sp-34 (pg. 145).  In the sloping stretch of   the stringer beam not more than one tensile bar of the tread slab can be tied to the beam top bars and the remaining tensile bars of tread slab will be little elevated corresponding to the beam top bars at any given junction. Kindly suggest what arrangement is to be done at the interface of this stringer beam – tread slab junction.    

Regards

P.nagaraju                                                







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mc.upadhyay1
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Joined: 26 Jan 2003
Posts: 134

PostPosted: Fri Apr 04, 2003 6:53 am    Post subject: reinf. detailing Reply with quote

Hello
I think you should provide lap length (=development length) according
to the big dia. bar
because the total new area ( which is now a combination of different dia.
bars) will also be fully stressed
as the old one will be; for a load combination for which it was originally
designed.
i.e. for combination of 28 & 32 it will be for 32 & for combination of 28 &
25 it will be for 28.

Regards
M. C. Upadhyay





nagaraju_pogula@                                                                                                
yahoo.com                To:      mc.upadhyay@jil.co.in                                                          
cc:                                                                                    
04/03/03 03:12           Subject: reinf. detailing                                                        
PM                                                                                                              
Please respond                                                                                                  
to general                                                                                                      






Dear friends,

I am relatively new to field of structural engg. I have
a few queries and request help from my learned colleagues of this field:

1)      I have a situation where I have to substitute the existing
longitudinal bars of columns of dia 28 tor which are not available in the
market with bars of some other dia. like 32,25,20 etc. Now splicing is to
be done in the ground floor (plinth beams were cast). The 28 tor bars are
provided upto-splicing zone of the ground floor columns. (16 no-28 Tor).
Can I substitute 16no.-28 Tor  with  8no-32 tor plus 8no-25 tor which gives
little more area than required. If this arrangement is permitted, what
splice length I have to provide for 28/32 lapping? Should it be as required
for 28 dia or for 32 dia.

2)      We are planning a riser-less staircase with a central stringer
beam. Consequently only a tread slab (step) with over-hang on both sides of
stringer beam is required to be provided .The reinforcement detailing of
the junction of stringer beam and tread slab is given in sp-34 (pg. 145).
In the sloping stretch of   the stringer beam not more than one tensile bar
of the tread slab can be tied to the beam top bars and the remaining
tensile bars of tread slab will be little elevated corresponding to the
beam top bars at any given junction. Kindly suggest what arrangement is to
be done at the interface of this stringer beam – tread slab junction.

Regards

P.nagaraju



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