Two Way (Punching) Shear - Concept Explained and Flat Plate Example - CSA A23.3 (Canadian Code)
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- Опубликовано: 8 фев 2025
- In this video we go over what two way/punching shear is with some visual examples, and solve a question using the limits prescribed in the Canadian concrete code. Let us know if you'd like to see more videos like this in the future!
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Let us know if you found this helpful in the comments down below, and if you want to see more tutorials on concrete!
Hi AF Math & Engineering,
I have previously used British code for Concrete design. For members like slab and footings, which usually do not have shear reinforcements, there was a multiplying factor based on amount of main tension steel for the slab. I do not find any such provision in Canadian code CSA A23. How can a slab (without shear reinforcement) be considered to have same shear capacity having nominal steel or much more than nominal steel?
Hey, for normal flexural members only shear reinforcement, prestress and shear resistance of concrete are considered for Vr. I suppose longitudinal steel in normal flexural members somewhat intersects shear planes, but typically we can't count steel that's being used for another purpose (flexural steel) as also resisting shear force. For deep members (shear friction) longitudinal steel passing through the shear plane is counted as shear resistance.
@@AFMathandEngineering As my original comment says, the British code considers the amount of tension reinforcement (in members like slabs or footings) and provides shear capacity in accordance with the amount of tension reinforcement. Since my initial comment, I have checked that EU and Indian codes also follow this. My question is why does CSA A23.3 does not. It is absurd to think that plain concrete will have same shear capacity as the same concrete with reinforcements. Shear capacity of concrete members based on shear reinforcements is a separate matter and British, EU and Indian codes have similar methods as CSA A23.3 to work out additional shear capacity.
Thank you!
@Monica Yolanda Ona Vera thanks, will be the next video we release.
Thanks a lot. you provide us with a clear explanation of ambiguous code concepts.
Thanks, glad to hear!
Super clear explanation even for a layman like me.
That's an absolutely great tutorial. Lets go more concrete
Thanks! More coming!
Very good explanation, thanks, Jorge Pedroso (Portugal)
Great video and especially relevant in 2021 in the wake of the Champlain Tower collapse in Surfside FL
Was it found to be a punching failure? Haven't been following the outcome of the investigation in the last week or so..
@@AFMathandEngineering Nothing official yet but analysis' such as the one below leave little doubt in my mind that punching failure was the cause. Now that all the debris is cleared from the site we see no evidence of a sink hole. ruclips.net/video/SEb12QwgM3s/видео.html
Hello, what happens when the control area for the punching shear exceeds the size of the base?
Will the video related to the effect of unbalanced moment transfer be shared any time soon.We are enthusiastically looking forward to watching it.The concept is very difficult to grasp.
In the near future, thanks for reminding us. Stay subscribed with the bell notification on for an update on when it arrives! We agree, it was a difficult concept for us to grasp as well when we were first introduced to it. Hopefully our video clarifies the topic!
me too waiting the unbalanced moment effect. thx for the video by the way its very helpful!
Great 👍👍
Great sir.. Thank alot.. If possible Could you please solve one problem with inadequate result.. How to design shear link in punching shear zone
That's a good idea, thanks for he suggestion!
Thank you!!!!
Thx alot❤
Love from india
I have to open a stair void in my existing slab. This void will be located right next to a column. How can I check if this is safe or not for punching shear? thanks
If it intersects your critical perimeter it may change the type of column under punching shear guidelines (interior,.exterior or corner) and you'll have to evaluate it as such.
AF Math & Engineering it’s an interior brick column 400x400. It’s indeed within the punching shear area, but I’ve done a computational analysis using a software I’ve got here and it was fine for punching shear. The slab is 150 thick. Do you think I should do any other calcs or tests? Because the house is a bit old and I just graduated so don’t have much experience with this. Thanks
Hey, I can't comment on any actual design situations, you'll have to consult the engineer stamping your drawings for advice specific to your project.
In general though if you're not sure it's best to do a quick hand calc, I know the column is located interior but it may act as an edge column if the opening intersects the critical perimeter for punching shear on one side of the column for an example. In this case you'd have a larger unbalanced moment because the formula you'd be using is different for an edge column vs an interior. Consult our punching shear video for clarification on the critical perimeter.
Can you do a video of ounching shear for footing?
We'll add it to the list of videos, thanks for the suggestion!
Can we have a video about DDM for flat Slab??
Thanks for the feedback! We wanted to do a full set of videos on the direct design method for one way and two way slabs, but first we definitely have to plan them out as itll have to be a set of like 5-6 videos and they'll be quite long. I think we will do the DDM for one way slabs soon, stay tuned!
thank you
no problem, appreciate the feedback!
I WANT MORE VIDEOES TO EATCH ABOUT SHEAR IN TOW WAY SLABS
We have a few more lined up, coming soon including the unbalanced moment portion of this question.