Building Codes - Punching Shear
Building Codes - Punching Shear
(OP)
The Indian concrete code does not have any information pertaining to the design of stud rails. As a result, we are looking at other building codes which address it such as ACI.
One of the concerns I have is regarding the different load and resistance factors on which the codes are based.
For example, the Indian code ultimate design is based on 1.5 DL + 1.5 LL with material safety factors of 1.15 (steel) and 1.5 (concrete) already incorporated in codal equations.
ACI uses different load factors (1.2 DL + 1.6 LL) and resistance factors (0.75 for shear).
If I were to use the ultimate loads per Indian codes, can I design for stud rails using the ACI code? I am wondering if the phi factor of 0.75 can be equated to a material safety factor of 1/0.75 = 1.33? Will it be an apples to oranges design?
I would appreciate some discussion on this and if any of you have had to do something similar in design?
One of the concerns I have is regarding the different load and resistance factors on which the codes are based.
For example, the Indian code ultimate design is based on 1.5 DL + 1.5 LL with material safety factors of 1.15 (steel) and 1.5 (concrete) already incorporated in codal equations.
ACI uses different load factors (1.2 DL + 1.6 LL) and resistance factors (0.75 for shear).
If I were to use the ultimate loads per Indian codes, can I design for stud rails using the ACI code? I am wondering if the phi factor of 0.75 can be equated to a material safety factor of 1/0.75 = 1.33? Will it be an apples to oranges design?
I would appreciate some discussion on this and if any of you have had to do something similar in design?






RE: Building Codes - Punching Shear
The load factors are based upon variability of the loads themselves.
When comparing two different code requirements for phi factors and load factors, I would think it would be a fairly simple procedure to use the ACI stud rail shear capacities and then compare the two codes for levels of safety (Load Factor)/(Resistance factor) = rough overall safety factor.
The capacity of the stud rails is a codified value that was developed by research and vetted through committees, peer reviews, etc. Since it doesn't appear directly in the Indian code, perhaps the Indian code has a provision within it that allows "other reasonable approaches". (see ACI section 1.4).
You then might have to submit the concept/procedure to the governing authority to get approval for this use of non-Indian code provisions.
RE: Building Codes - Punching Shear
The Indian code has an inbuilt safety factor. The resistance factors are built into the code equations, the overload factor is 1.5.
RE: Building Codes - Punching Shear
RE: Building Codes - Punching Shear