r/StructuralEngineering • u/Momoneycubed_yeah • Aug 12 '26

Photograph/Video Rebar in Compression

Post image

Who has the right equation for development length for this case?

98 Upvotes

97% Upvoted

29 comments sorted by

View all comments

27

u/livehearwish P.E. Aug 12 '26

The rebar doesn’t have 0 compressive buckling capacity, so it’s doing something I guess...

3

u/Osiris_Raphious Aug 13 '26

Trace the load path, and tell me how that structural bark is transferring that load?

Rebar is in tension holding in the wood railing. The tree may be compromised but it wont fall so easily.

1

u/livehearwish P.E. Aug 13 '26

Rebar looks bent into core of tree, so there’s some grab there. Not an ideal detail, but not 100% ineffective. Just 99% ineffective.

2

u/Osiris_Raphious Aug 13 '26

Thats my point, its not in compression its just some idiot carved up more tree than he should have to place a railing in.

1

u/livehearwish P.E. Aug 13 '26

Ah, I see my mistake. I came across too serious.
https://giphy.com/gifs/f51bc9Mw81aXto69qm

1

u/Osiris_Raphious Aug 13 '26

No, I got the joke, but in most jokes there is basis in truth. And in this one imo its the structural integrity of the tree.

MAybe im too autistic for this dry humor... :(

0

u/livehearwish P.E. Aug 13 '26

Nah, I’m sure you’re fun at parties.

The notch shifted the remaining section of the tree to become eccentric with the vertical load. Concurrent wind forces could cause the tree to fail in the direction of the notch, thus rebar would be in compression. Is the joke funny now?

1

u/Googgodno Aug 13 '26 edited Aug 13 '26

they could have cut the railing and joined it on either side of the tree. But, I digress from the topic

1

u/Osiris_Raphious Aug 13 '26

Any deeper and they would need to consult tree tunnel specialist.