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Revision of IS 456 - Partial safety factors

 
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durai_sundaram
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PostPosted: Fri May 15, 2020 2:04 am    Post subject: Revision of IS 456 - Partial safety factors Reply with quote

It is found that in the next revision of IS 456, The partial safety factors for the materials remains unchanged . i.e

partial safety factor for Concrete   : 1.5


Partial safety factor                      : 1.1.5

                Thus whether you use quality steel product from Tata / Vizag /Sail or any company where strict  quality control is there , safety factor is 1.15 only .   On other hand if you use a local Rerolled steel from Scraps,
then also, it is 1.15 .
Then naturally , unless specified, a buyer is lured  towards a              local un quality steel product for economic reasons.   So, then quality steel producer is penalised.   If code can sets standards for quality control & have three grades of  steel based on quality , the partial safety factors can be reduced to 1.0 , 1.1  & 1.2 .  


                  Similarly , for concrete also, whether manufactured by  a site batching plant with strict quality control measures or ordinary volume batched concrete mixed in half bag machine or hand mixed, the particular safety factor is the same 1.5 .
                  Here also, four categories can be introduced based on manufacturing standards & the partial safety factor can be reduced accordingly to say 1.2,1.3.1.4 & 1.5.
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spsvasan
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PostPosted: Sun May 17, 2020 7:24 am    Post subject: Re: Revision of IS 456 - Partial safety factors Reply with quote

durai_sundaram wrote:
It is found that in the next revision of IS 456, The partial safety factors for the materials remains unchanged . i.e

partial safety factor for Concrete   : 1.5


Partial safety factor                      : 1.1.5

                Thus whether you use quality steel product from Tata / Vizag /Sail or any company where strict  quality control is there , safety factor is 1.15 only .   On other hand if you use a local Rerolled steel from Scraps,
then also, it is 1.15 .
Then naturally , unless specified, a buyer is lured  towards a              local un quality steel product for economic reasons.   So, then quality steel producer is penalised.   If code can sets standards for quality control & have three grades of  steel based on quality , the partial safety factors can be reduced to 1.0 , 1.1  & 1.2 .  


                  Similarly , for concrete also, whether manufactured by  a site batching plant with strict quality control measures or ordinary volume batched concrete mixed in half bag machine or hand mixed, the particular safety factor is the same 1.5 .
                  Here also, four categories can be introduced based on manufacturing standards & the partial safety factor can be reduced accordingly to say 1.2,1.3.1.4 & 1.5.


Dear SEFIan

I beg to differ.

IS also gives quality requirements for steel bars. If the local brand satisfies all the IS requirements, I think, we can accept it. We engineers should test the steel and use it.

Regarding concrete, BIS tries to acknowledge good quality work. In IS 10262 [Mix design], two sets of values are given for standard deviation to be assumed for mix design. The first category pertains to sites with very good quality control measures and the second is with less quality control measures. The second one will result in higher cement consumption.

By the way, if the RMC management is poor, RMC can be worse than site mixed concrete.

S.P.Srinivasan
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