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b.r.seshasayee at saip... Guest
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Posted: Wed Oct 27, 2004 5:25 am Post subject: Top reinf in footings |
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To the members I have a question on the design of footings Top reinforcement is a must for footings with loss of contact ( gross pressure is tensile). I feel we need to provide top reinforcement if the net pressure on any one side of cantilever span is tensile. Some people do not accept this Please mail your expert opinion on this. For clarity , I have attached excel file to admin@sefindia.com Regs
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abhyankar ...

Joined: 26 Jan 2003 Posts: 94
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Posted: Wed Oct 27, 2004 8:30 am Post subject: Top reinf in footings |
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To Mr. B. R. Seshasayee, Dear Sir,
In reality Tensile pressure is fictitious!! When footing loses it's contact with the soil, pressure gets redistributed on the balance area, which is in contact with soil. Thus the magnitude of direct pressure gets increased on balance area. Naturally the moment also increase, requiring greater reinforcements. Whereas the area, which has lost the contact with soil has theoretically only selfweight acting on it (and the soil-surcharge if any) thus the moments will be usually less, which may be checked for the requirement of top reinforcements.
Further the loss of pressure should not be permitted. If permitted, it should be limited to minimum.
Regards Vivek Abhyankar HCC
-----Original Message----- Message From b.r.seshasayee@saipem-india.com [mailto:b.r.seshasayee@saipem-india.com] Sent: Wednesday, October 27, 2004 4:25 PM To: ABHYANKAR@hccindia.co.in Subject: Top reinf in footings
To the members I have a question on the design of footings Top reinforcement is a must for footings with loss of contact ( gross pressure is tensile). I feel we need to provide top reinforcement if the net pressure on any one side of cantilever span is tensile. Some people do not accept this Please mail your expert opinion on this. For clarity , I have attached excel file to admin@sefindia.com Regs B.R.Seshasayee
----------------------------------------------------------------- Hindustan Construction Company, Mumbai, India
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