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design rebar for shear in rc members

design rebar for shear in rc members

design rebar for shear in rc members

(OP)
In the design of r.c frame members, the design rebars are given as a ratio. Will some one explain how to get the spacing and diameter of the stirrups and what is the ratio diven in the design output. For example the design rebar for a member is given as 0.162, how the stirrups are calculated for this.
Thanks in advance for helping a new engineer participating in this forum.

RE: design rebar for shear in rc members

Given a required ratio of rebar area divided by spacing, simply start with a trial rebar size or spacing and calculate the other variable.  It is a simple thing once you get a feel for it.

RE: design rebar for shear in rc members

Taro is right.  The ACI gives an equation for calculating the required area of steel Vs.  You need to decide what size to use (most use #3 unless you have large shear loads or are getting a very tight spacing s<4") and remember that Av is the area of two legs resisting shear(1 #3 is 0.11 sq in, so Av would be 2*0.11=0.22 sq in).  Then you need only solve for the required spacing s and round to a suitable number, usually just round down to the nearest whole number.

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