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Punching Shear Perimeter & Varying Slab Depths

Punching Shear Perimeter & Varying Slab Depths

Punching Shear Perimeter & Varying Slab Depths

(OP)
Hello,

I've done a bit of research and asked around the office for some opinions, but I'd like to hear what everyone else thinks.

I've got a column partially within a slab fold and thus the critical shear perimeter has different depths.

Should I be trying to adopt an 'averaging' methodology for the critical shear perimeter and depth to tensile steel? Or should I be dividing the moment and shear by 4 and checking only Quadrant D using code equations.



Additional info:
- N40 concrete
- P/A = 1.5 MPa
- V* = 850 kN, Mx* = 230 kNm, My* = 170 kNm
- 2N12-400 nominal ligs through 380/350 fold section.
- AS3600 code

RE: Punching Shear Perimeter & Varying Slab Depths

200 all around for me. The code provisions are heavily reliant on testing rather that mechanics fundamentals and I feel that it's pretty risky to start extrapolating those provisions into complex situations. I just picked up a copy of Bijan Aalami's new PT text. He recommends going to one way shear stress values the minute things deviate from the classic scenarios.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: Punching Shear Perimeter & Varying Slab Depths

The commentary to AS3600 suggests that an averaging methodology is appropriate.

RE: Punching Shear Perimeter & Varying Slab Depths

Much also depends on the geometry of the stepping and the rebar detailing involved. If you post some sections through the joint, we may be able to comment further. Frankly, it's pretty tough just to carry your local slab moments across these joints successfully.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: Punching Shear Perimeter & Varying Slab Depths

I would be putting a drop panel around the column. Sorry 200 mm slabs are not flat slabs in my office unless it is support on columns at 3000mm crts or less.

http://www.nceng.com.au/
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