Wood Panels Design Shear Question

[Struct123ure]

Hello,

In the CSA O86-14-Engineering Design in Wood section 9.5 Resistance of structural panels, there are 4 different shear checks. I am confused regarding what they mean and which one to check in which scenario?
I have read the “CSA-O86-14-Commentary”, “Plywood-Design-Fundamentals-Canadian-Plywood-Association” and the related parts of textbook “Design of wood structures-Donald Breyer(6th Ed)”.
Below are the sections for your convenience and for myself I have added snippets in red boxes of what I think all of these are referring to. (I believe it would be great if CSA could include something like this in the next update).
I don’t see the difference between “9.5.5.1. Shear due to bending of structural panel on edge” and “9.5.5.2 Shear-through-thickness in structural panel splice of gusset plate”. 2nd appears to be same as the 1st except in horizontal direction?

[URL unfurl="true"]https://res.cloudinary.com/engineering-com/image/upload/v1695652311/tips/Pg73-74_vuwx9g.pdf[/url]
[URL unfurl="true"]https://res.cloudinary.com/engineering-com/image/upload/v1695652337/tips/Plywood-Design-Fundamentals-Canadian-Plywood-Association_jouq8e.pdf[/url]

 

[jayrod12]

Well what is your actual application?

There are situations where all 4 could need to be checked simultaneously, but that would be rare. I'd anticipate in many cases you're checking only one of the 4 based on the your current application.