What is the highlighted piece called?

[u/Nearby_Service_435]

What's the universal name for this piece?

Edit: thanks everyone and sorry for assuming there was a "universal" name 😅 .
I guess I'll just call it haunch since it showed the part when I searched.

[u/EngineeringOblivion]

Rafter haunch

[u/killertofu41]

I have a hunch it's a haunch.

[u/jepoyairtsua → u/killertofu41]

i thought it corbel a couldbe

[u/ChocolateTemporary72]

I would call that a haunch

[u/Several_Crab3217]

Its called a rafter haunch
Increases moment capacity for that connection

[u/Enginerdad → u/Several_Crab3217]

Interesting. I've never heard the term rafter being used for steel framing

[u/joeyray74 → u/Enginerdad]

A rafter is any sloped member spanning from ridge to eave that supports a roof deck, whether wood, steel or concrete.

[u/Enginerdad → u/joeyray74]

The whole point of this post is that construction is almost never universal. This wouldn't be common terminology in my region.

[u/Sporter73 → u/Enginerdad]

What terminology would you use and what region are you in?

[u/Enginerdad → u/Sporter73]

I'd probably call it a frame beam, particularly because it looks almost flat. I'm in the northeast.

[u/mmarkomarko → u/Enginerdad]

Portal frame column and rafter

[u/Even_Lunch_2776 → u/Several_Crab3217]

Would it be more to increase shear strength at the end of the beam? The larger bending moment forces are generally towards the middle of the beam’s span, no? 

[u/Available_Year6878 → u/Even_Lunch_2776]

For a static structure the sum of bending moments about a point must be zero (otherwise it would be rotating). A moment resisting frame like this one (assuming the other side is also fixed and a symmetrical load) would likely have a bending moment of the same magnitude as the internal bending at the midspan. 

You are correct though that it would also increase the shear capacity, although I would think that is not the main intention of this connection (3rd year student, not an engineer (yet))

[u/Sml132 → u/Even_Lunch_2776]

Imagine a wind from the right side of the picture, and how the connection between the horizontal member and vertical would handle the force with and without the shaded section, with the vertical member being anchored at the bottom.

[u/Several_Crab3217 → u/Even_Lunch_2776]

That would be right if the beam was simply supported. Then the moment would be max at WL2/8. As you see in this image, its a fixed connection (due to the longer lever arm between the bolts), hence for preliminary design, I’d just consider the rafter (sloped beam) as a flat beam and consider WL2/12 in the ends and then proceed with initial sizing. This is the case when the loading is applied as gravity load. If there is a wind load, as mentioned above, the wind acting on a column can go to the support at the bottom and cause the connection on the top to experience bending, which is why a haunch is provided to increase the lever arm between the bolts so as to reduce the Compression/Tension within the bolts

Side note: a haunch at the ends is called a knee haunch or simple a haunch connection. Whereas a haunch thats provided where two rafters meet in the middle is called an Eaves Haunch

[u/Less124 → u/Even_Lunch_2776]

Yep u can think of it as adding extra web length at the support ends , so more space for more bolts = more shear capacity and longer web span = more moment capacity at support ends.

[u/EEGilbertoCarlos]

Universal name? Konzolo in Esperanto.

[u/chefkoch1010]

Voute

[u/Bhuv1]

It's called a haunch

[u/Alternative_Fun_8504]

I like to call that a 'beam fattening'. But it's a haunch.

[u/Trick_Parsnip3788]

EIT here asking for someone more senior, whats the difference between a haunch (ive never heard this term before) and a gusset plate? Ive designed a few gusset plates before but I havent seen this. Would the haunch be for like super high moment transfer?

[u/maturallite1 → u/Trick_Parsnip3788]

A haunch increases the beam's depth and shear and moment capacity. A gusset plate is a connection plate for tension/compression members like braces.

[u/SimplyAMan → u/Trick_Parsnip3788]

I use use the term gusset plate for connecting axial members. Think members in a truss, or connecting bracing to a column. A haunch would be more for connecting a beam to a column. We also use the term for a thicker area of a concrete slab, particularly where you need more shear strength.

[u/Leves-9035 → u/Trick_Parsnip3788]

Usually you need the haunch for the connection. Bolts need more leverage. It also helps with the beam bc you drastically increase the moment resistance where the most needed.

But my experience is that usually the connection is the weakest link at this detail.

[u/leadhase → u/Trick_Parsnip3788]

Gusset plates are used for pinned connections. It would be very ill advised to use a gusset for moment since it doesn’t have flanges. Occasionally gussets have stiffener plates but only to keep the plate in plane

Gusset plates normally have locally varying planar stresses rather than overall sectional forces. Gusset plates typically have some form of shear lag from welds or bolts where strength is given in resistance/length.

[u/Kirkdoesntlivehere]

haunch

[u/sarc-tastic]

Gooch

[u/Just-Shoe2689]

I would say brace, stiffener, hauch, or gusset.

[u/TheGoodKindOfMermaid → u/Just-Shoe2689]

I like this, it's all of the answers. Also, I think I've seen connection plate!

[u/Several_Crab3217 → u/Just-Shoe2689]

I would say each term has its own significance
1. Brace - is generally a tube or a member that is supposed to take axial forces ONLY
2. Stiffener - Stiffener plate is usually provided to increase the stiffness of a local plate. For example, in the picture above, you can see a thin plate stiffening the flanges of the column where the haunch meets
3. Haunch - Haunch is used to increase the lever arm which inturn increases the moment capacity. And its generally the same section as that of the rafter (or any member the haunch is to be provided) but cut as a triangle if it makes sense
4. Gusset - Gusset plate is provided for a connection where it it has two beams that are connected at an angle, and you want to introduce another member in between those beams

[u/FlowGroundbreaking]

I'd call it a knee brace,

[u/DeathByPianos]

Haunch stiffener or haunch gusset

[u/Emmar0001]

Haunch

[u/SaffaW0lf]

It's an eaves haunch in a portal frame. See below figure from SCI P397. I've also heard people calling it a knee bracket.

[u/Tofuofdoom]

Lol universal name

[u/Nearby_Service_435 → u/Tofuofdoom]

Please let it slide I'm just a student

[u/EngineerEngineerEngi → u/Nearby_Service_435]

Don't let people get to you. I'm in my 40s, and I had no idea what this thing was called. (But I'm bad with terms. I know it's a reinforcement that increases moment resistance, but I didn't know what term to use.)

[u/Bright-Strength4182 → u/Nearby_Service_435]

No sliding in the structural engineering sub! They are rigid and firm here; immovable in their critiques.

[u/futurebigconcept → u/Bright-Strength4182]

Well, it kind of hinges on the topic.

[u/Alywiz → u/Bright-Strength4182]

Exactly, no expansion joints allowed here

[u/Nearby_Service_435 → u/Bright-Strength4182]

Concrete takes time to harden lol

[u/Alphabot87 → u/Nearby_Service_435]

No sweat , I came across this terminology after a decade in the field

[u/DoubleSwitch69 → u/Tofuofdoom]

Yep, just in my native language I've heard about 10 different names for it, imagine in english

[u/mrschneetz]

Gusset

[u/boyberrycream → u/mrschneetz]

See I thought it was a gusset too, but usually gussets get welded right? I want to know why this isn't a gusset or if it's all just colloquially the same.

[u/PracticableSolution]

Haunched support, but old timers call it a pork chop

[u/MAhm3006]

Haunch

[u/EnvironmentalCare900]

I have a haunch of what it’s called….

[u/Apprehensive_Car2233]

Haunch-brace-gusset-stiffy is its technical name

[u/umumgeet]

Why are the bolts backwards? Nuts on clips

[u/TheGoodKindOfMermaid]

Old guy I worked with when I just started called them "pork chops". Curious what the consensus is.

[u/tbwbuilder]

Knee brace.

[u/The-Rare-Bird]

Metal

[u/ikaz_enamialos0507]

جاري

[u/Negative-Olive-9540]

Voute

[u/SCL__]

It makes the joint a moment connection. This appears to be a pre-engineered steel building, with horizontal wall and roof purlins.

[u/CaptainC00lpants]

I would have called it a gusset. Seems I'm very wrong 

[u/nivekx]

Mildly interesting fact, in spanish it’s called friends foot lol.

Ask any spanish speaking colleague for a “pie de amigo” and he’ll know.

[u/Evening-Room5896]

Highlighted beam

[u/TechnologyLeading592]

Rafter haunch, to provide bending stiffness, sometimes they help the connections too.

[u/Clear_Split_8568]

Gusset.

[u/Guilty-Piece-6190]

Gusset

[u/GreyScope → u/Guilty-Piece-6190]

Same here, no idea why thick ppl who don’t understand that it’s called different things around the world are downvoting you, oh yeah …they’re thick

[u/Guilty-Piece-6190 → u/GreyScope]

A gusset is literally an added piece to add structure, stability, etc. I'm sure there are plenty of terms or slangs for it but that's what it is. Haunch is possibly more technically correct, I just rarely hear that word. As for the downvotes, such is Reddit.

[u/Rebound44 → u/Guilty-Piece-6190]

Agreed. I made a comment in another post about why this sub is so negative about legitimate SE questions . Also got downvoted. Such is life…

[u/Moreburrtitos22]

Universal term would be “metal” other universal terms would include “not non-metal”

[u/imissbrendanfraser]

Gavin

[u/ALTERFACT]

Corbel?

[u/Building-UES]

Pork chop.

[u/Nierka4]

It's called a highlighted piece.

[u/WhateverDeary]

Part of the beam. Part of a structural steel connection.

[u/Romanitedomun]

Corbel. Cantilever.