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Min+Shear+Reinf - 3 Minimum Area Requirements for Shear...

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Unformatted text preview: 3. Minimum Area Requirements for Shear Reinforcement AC1 Code Section 11.4.6. - This criteria must be satisfied in "normal" beams whenever V“ /¢ > V204) 5mm m ova/Z bws (1143) fyr - Value used for 0.75 J}: must be 2 50 psi — For consistency, I like to solve this for the Spacing to satisfy the minimum area re uirement, i.e.: S < Atfy, ‘ bw(0.75)\[}7: 4. Maximum Spacing Criteria for Shear Reinforcement AC1 Code Section 11.4.5 — Again, this requirement is to be satisfied whenever V" /¢ > 1/2( V6) for Vs(req'd.)=(Vu/¢- VC) 5 4 J17; (bwd), s s an and $24" for Vs(req'd.)= (14, /¢- 19> 4 J? (b... d), s Sci/4 and 512" — Note that Code Section 11.4.7.9 states that if, V.(req'd.)=(n/¢- Va > 8 if? (bid) the section area must be increased. 5. Notes on Design Shear Envelope at Compression Supports i. AC1 Code Section 11.1.3 allows ”in most cases” for the end region of a beam to be designed for the "design shear" occurring at a distance "d" from the face of the support. Exceptions are for: (a) concentrated loads within "d" of the support face, (b) a "noncompression" type of support, i.e., a beam (girder) supporting a beam, and (c) loads applied below mid-depth of the beam. ii. Place first stirrup at 5/2 from face of support. ...
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