Re: Prerstressed Concrete- Help!!


"aman" <amanpreet.ahuja@xxxxxxxxx> wrote in message
news:1124384985.312445.103760@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Mr Bob
> As far as i know about the prestressed concrete and the formula we are
> using it states about the prestressed steel . concrete stress is
> calculated in that prestressed Area of steel is used.
> regarding to reply to u r query . prestressed concrete
> I would like to say one thing, as the whole thing is a hetrogenous
> system and to make the system in to homogenoue one we use equivalent
> stress in concrete thats include the area of steel.
>

Yes, this is true you would make the steel equivalent area of concrete by
multiplying the steel area by 'n' which is the modulus of elasticity of
steel divided by the modulus of elasticity of concrete. This is for service
load only. This is not for ultimate strength design which is required by
code. Ultimate strength requires the calculation of strain that develops in
the steel to insure that the stress of the steel is not over the yield
strength of the steel and to calculate the resisting moment that the steel
provides. Always, tension equals compression.

CID...


.

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