[SEFI] Require Help

[santoshbiraj]

There are 2 beams secondary beam sitting on main beam. I have released moment in secondry beams. In one of the secondary beams I had no much shear force value. Whereas in the other secondary beam I had little more shear.
so I used 2 legged vertical stirrups in both the beams and I was getting a spacing of less than 100 so I increased the pt value at the junction
and provided -ve reinforcement at top so that I can increase the tow c value and get the desired spacing for
shear. I do wanted to cross #8@, 2LVS. So my question is can I increase the pt at the junction to reduce the shear or not.
If not why so?

Regards,
Santosh

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[adilkhan78]

Dear Santosh
Firstly you released the moment in secondary beam, it means theoretically there should be no reinforcement at top but to hold the stirrups we need at least two bars of nominal diameter, now by providing reinforcement at top you are restraining joint at that location. Fixity of joint will depends on the amount of reinforcement provided at top. The fixity at that joint will develop torsional moment in the main beam if the secondary beam is not continuous on other side. So if you want to release moment at ends of secondary beam, you should provide only nominal reinforcement at top. As far as spacing of stirrups are concern you can have a spacing of 75mm c/c.

Hope the above mentioned points will be useful to you.

Best Regards
Adil Khan

http://www.sefindia.org/forum/viewtopic.php?p=8193#8193

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[Arunbabu.S]

Sir

You can increase the reinforcement at the junction and reduce the shear as it is your requirement but sometimes it was uneconomical. But the detailing of the reinforcement which you are providing should extend up to a distance of Ld/3 at the supports so that your beam behaves as a simply supported beam.

Regards,
Arunbabu.S

From: santoshbiraj [mailto:fo...@sefindia.org]
Sent: Tuesday, August 26, 2008 12:16 PM
To: gen...@sefindia.org
Subject: [SEFI] Require Help

There are 2 beams secondary beam sitting on main beam. I have released moment in secondry beams. In one of the secondary beams I had no much shear force value. Whereas in the other secondary beam I had little more shear.
so I used 2 legged vertical stirrups in both the beams and I was getting a spacing of less than 100 so I increased the pt value at the junction
and provided -ve reinforcement at top so that I can increase the tow c value and get the desired spacing for
shear. I do wanted to cross #8@, 2LVS. So my question is can I increase the pt at the junction to reduce the shear or not.
If not why so?

Regards,
Santosh

"This Message and its contents is intended solely for the addressee and is proprietary.Information in this mail is for L&T Business Usage only. Any Use to other than the addressee is misuse and infringement to Proprietorship of L&T ECC.If you are not the addressee please return the mail to the sender.L&T ECC DIVISION"

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[ykalamkar]

Dear santosh,
As you have released the moment at top so as to design the secondary beam as simply supported at that end, you can not increase the steel at top. otherwise it will transfer the moment to main beam. Your tension face is at bottom in this case. hence you can increase the tension steel i.e steel at bottom. then you can increase the shear strength of concrete as well as the spacing of the stirrups.
Regards
Yogesh

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[jiwajidesai]

Dear Santosh
The shear resistance of shear stirrups depends also on Asv, ie area of shear legs which cross the shear crack due to diagonal tension.Hence you may increase the no of legs suitably to resist direct shear by using 3 or 4 legged stirrups, which will proportionately increase the spacing.
Regards
J Y Desai

________________________________

From: santoshbiraj [mailto:fo...@sefindia.org]
Sent: Tue 8/26/2008 12:16 PM
To: gen...@sefindia.org
Subject: [SEFI] Require Help

http://www.sefindia.org/forum/viewtopic.php?p=8198#8198

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[sdec.in]

Well, it may not be the right thing to do having released the moment on top; as theoretically the top should not be carrying any moment now and needs to be given a nominal steel with 1/3rd the usual anchorage or Ld.
The shear stress will then be checked with the bottom steel only.
It is incorrect to increase top steel, as it shifts the end condition more towards Fixed condition, contradicting with the "released" end condition.
Regards
Sangeeta Wij

Quote:

----- Original Message ----- " From: Arunbabu.S (fo...@sefindia.org) To: gen...@sefindia.org (gen...@sefindia.org) Sent: Tuesday, August 26, 2008 2:54 PM Subject: [SEFI] Re: Require Help Sir You can increase the reinforcement at the junction and reduce the shear as it is your requirement but sometimes it was uneconomical. But the detailing of the reinforcement which you are providing should extend up to a distance of Ld/3 at the supports so that your beam behaves as a simply supported beam. Regards, Arunbabu.S

From: santoshbiraj [mailto:fo...@sefindia.org] Sent: Tuesday, August 26, 2008 12:16 PM To: gen...@sefindia.org (gen...@sefindia.org) Subject: [SEFI] Require Help There are 2 beams secondary beam sitting on main beam. I have released moment in secondry beams. In one of the secondary beams I had no much shear force value. Whereas in the other secondary beam I had little more shear. so I used 2 legged vertical stirrups in both the beams and I was getting a spacing of less than 100 so I increased the pt value at the junction and provided -ve reinforcement at top so that I can increase the tow c value and get the desired spacing for shear. I do wanted to cross #8@, 2LVS. So my question is can I increase the pt at the junction to reduce the shear or not. If not why so? Regards, Santosh

"This Message and its contents is intended solely for the addressee and is proprietary.Information in this mail is for L&T Business Usage only. Any Use to other than the addressee is misuse and infringement to Proprietorship of L&T ECC.If you are not the addressee please return the mail to the sender.L&T ECC DIVISION"

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Search SEFI Site before you make new post:You may get quick answer to your query by searching SEFI archive. Do make sure you search SEFI archive before opening a new topic. Visit the site experience the search features here.

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