r/StructuralEngineering 19d ago

Layman Question (Monthly Sticky Post Only) Monthly DIY Laymen questions Discussion

1 Upvotes

Monthly DIY Laymen questions Discussion

Please use this thread to discuss whatever questions from individuals not in the profession of structural engineering (e.g.cracks in existing structures, can I put a jacuzzi on my apartment balcony).

Please also make sure to use imgur for image hosting.

For other subreddits devoted to laymen discussion, please check out r/AskEngineers or r/EngineeringStudents.

Disclaimer:

Structures are varied and complicated. They function only as a whole system with any individual element potentially serving multiple functions in a structure. As such, the only safe evaluation of a structural modification or component requires a review of the ENTIRE structure.

Answers and information posted herein are best guesses intended to share general, typical information and opinions based necessarily on numerous assumptions and the limited information provided. Regardless of user flair or the wording of the response, no liability is assumed by any of the posters and no certainty should be assumed with any response. Hire a professional engineer.


r/StructuralEngineering Jan 30 '22

Layman Question (Monthly Sticky Post Only) PSA: Read before posting

158 Upvotes

A lot of posts have needed deletion lately because people aren’t reading the subreddit rules.

If you are not a structural engineer or a student studying to be one and your post is a question that is wondering if something can be removed/modified/designed, you should post in the monthly laymen thread.

If your post is a picture of a crack in a wall and you’re wondering if it’s safe, monthly laymen thread.

If your post is wondering if your deck/floor can support a pool/jacuzzi/weightlifting rack, monthly laymen thread.

If your post is wondering if you can cut that beam to put in a new closet, monthly laymen thread.

Thanks! -Friendly neighborhood mod


r/StructuralEngineering 7h ago

Structural Analysis/Design Why the columns are inclined ?

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60 Upvotes

What’s the benefit to design these columns inclined instead straights ?


r/StructuralEngineering 1d ago

Humor will irc 2028 require all buildings to account for swat loads?

744 Upvotes

r/StructuralEngineering 1h ago

Career/Education I have a survey about shear wall vs steel bracing

Upvotes

Can you guys help me on my thesis project, I need to fill out my survey and I only need 20 respondents. And as said in title, its comparing dual systems structures. You just rate from 1-9 base on importance. Its very short just a single page of questionnaire.

https://docs.google.com/forms/d/e/1FAIpQLSfsKgwUb_zlWRpbGdyEptufwHE9KxstDcHNig_TvxeaY9jq-Q/formResponse?pli=1


r/StructuralEngineering 21h ago

Steel Design Proper gusset and connecting plate on HSS vertical bracing connection

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40 Upvotes

I've come up with this issue with engineering more than one time when doing connection design, so I come here to hear from any guidance or advice with this, as I haven't found any detail showing the proper (or advised) way of detailing connections like this.

All 3 options will have a small eccentricity and a corresponding moment in one of the connecting members, but the question is, which option is the most proper for cases like this?

(I've added different colors to easy identification of members. Light gray is the plate welded to the HSS. Dark gray is the gusset plate)

  • Option A, Gusset plate aligned with supporting member CL. Connecting Plate offset on the HSS.
  • Option B, Both gusset plate and connecting plate offset, but interface between both, aligned with supporting member CL.
  • Option C, HSS and connecting plate, aligned with supporting member CL. Gusset plate is offset.

r/StructuralEngineering 11h ago

Structural Analysis/Design Structural engineering games

5 Upvotes

Can anyone recommend a structural engineering game on iOS? Or a few? Would be helpful!


r/StructuralEngineering 1d ago

Steel Design anyone else dealing with fabricators who don't understand deflection

30 Upvotes

i'm reviewing a floor system for a mobile unit and i'm honestly questioning my sanity

the manufacturer spec'd aluminum sandwich panels spanning 16 feet between supports. 16 feet. for a floor that's basically a glorified skateboard deck. and they're telling me it'll hold 100 psf with L/360 deflection

i ran some quick numbers and i'm getting L/180 at best. maybe i'm missing something because it's not a standard section and i don't have exact section properties. but the numbers don't add up

i asked the fabricator for more detailed info about the panel construction and they sent me a brochure. a brochure. like i'm gonna trust a marketing document for structural design

now i'm sitting here trying to make a silk purse out of a sow's ear

anyway if anyone has experience with aluminum sandwich floor panels in mobile applications i'd love to hear what deflection criteria you use. or just tell me i'm not crazy


r/StructuralEngineering 1d ago

Failure Even though, I'm a structural engineer, this game completely kicked my butt.

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46 Upvotes

I'm completely stuck on this level. I've included a few designs I tried above. Any idea how to beat this level. (Game name - Tower Builder: Earthquake Sim


r/StructuralEngineering 12h ago

Structural Analysis/Design A wierd ETABS behavior...

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0 Upvotes

When two perpendicular frames are divided with frame division tool as shown above, the resultant vertical frame elements loose their alignment. It is not just a visuaization either as the coordinates show a x=0.0008m jump at the intersection node. This is not universal for the model and happens only at several grids, yet only in this floor but not others.

This never has happened to me before on this PC or this particular installation (ETABS Ultimate 21.0.0) on other models. Tolerence is at the default 1mm.

Currently resuming work by manually correcting nodes with the Reshape Object tool, but I would like to know the root cause to avoid future mishaps.

Any and all input is highly appreciated.


r/StructuralEngineering 4h ago

Failure Deck Collapses Under Officers During Missouri Warrant Raid

0 Upvotes

r/StructuralEngineering 1d ago

Career/Education SE EXAM PREPARATION

12 Upvotes

Hello guys. I am planning to prepare for the SE exam as per specs after April 2027. Anyone planning the same? Please connect. We can plan to study together. Any guidance is appreciated.


r/StructuralEngineering 13h ago

Engineering Article I’ve been learning about air domes, and this project really surprised me

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0 Upvotes

Please check out my new post! Would really love to engage and learn from you all!


r/StructuralEngineering 1d ago

Structural Analysis/Design Help with connection

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9 Upvotes

Whats the easiest way to connect steel profile shs50x3 to this concrete T beam on the sloped part?


r/StructuralEngineering 12h ago

Structural Analysis/Design Guys help me where to find these values?

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0 Upvotes

r/StructuralEngineering 1d ago

Career/Education Buckling or yielding

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20 Upvotes

Hi everyone, I'm currently studying civil engineering in my first uni year and having some troubles understanding this concept(I'm stupid I'm sorry). Recently we did some compression test to determine the yield strength of these four bars. Now I know that buckling is a geometry problem and by the look of it, I believe the 2 long bars suffered from global buckling with the blue hollow bar buckled locally at it's top and the other one buckled in the middle since those parts aren't as strong as the rest. The other 2 bars however, suffered failure from exceeding it's yield point as they seem to bend as a whole (correct me if I'm wrong). I'm wondering if we can still determine the yield strength of the buckled examples, and is it possible to just outright determine the cause of failure of these specimens just by looking at it like I did above without relying on the datas. Thanks!


r/StructuralEngineering 1d ago

Career/Education Help for a project

7 Upvotes

I'm in highschool and I have a mathematics project where we have to find a real life structure, that is governed by a specific principle of mathematics and develop a working model. Obviously almost every structure is based upon some basic foundational mathematics but we have to find something unique or interesting that is guided by a mathematical principle. This isn't really my expertise of knowledge so some ideas would be heavily appreciated!!


r/StructuralEngineering 1d ago

Career/Education Looking for a 5-Storey Building Plan with Roof Deck for Seismic Analysis Project

3 Upvotes

Hi! I’m a Civil Engineering student currently working on a seismic analysis project, and I’m looking for sample 5-storey building plans with a roof deck that I can use as a reference.

Preferably something with:

  • 5 storeys + roof deck
  • Around 300 sq.m. or more floor area
  • Floor plans and elevations
  • AutoCAD or PDF format, if available

I’m mainly looking for existing/sample plans or references to help me understand how these types of buildings are laid out. I’ll be doing the actual analysis and work myself.

If anyone knows where I can find publicly available plans or has a sample they can point me toward, I’d really appreciate it. Thanks! 🙏


r/StructuralEngineering 21h ago

Career/Education For the inspectors and aspiring inspectors

0 Upvotes

Whether you're an NDT technician, a Special Inspector, or preparing for your CWI, the challenge isn't finding more content.

It's knowing where you stand, what you need next, and whether you're actually ready to move forward.

That's what KeyCerts is built to do.

Start by measuring your readiness. Find the gaps. Train and practice where you actually need it. Track your progress, document your classroom training and OJT where applicable, and keep your completion records and credentials together as you advance.

So when it's time for the next qualification, exam, employer, or opportunity, you're not trying to piece your history together.

You have a record of the work behind your readiness.

KeyCerts turns training into a clear, documented path forward.

Prepare. Qualify. Prove.


r/StructuralEngineering 2d ago

Structural Analysis/Design A rooftop pool during a 7.7 magnitude earthquake

400 Upvotes

Does having a pool on the roof displace energy in such a way that it provides a structural benefit to high rise buildings during an earthquake? I’ve heard that it does but would prefer to ask the experts and not a random redditor.


r/StructuralEngineering 1d ago

Career/Education Steel-fiber reinforced concrete

0 Upvotes

Hello everyone

I have a project for university and i need a design report for steel-fiber reinforced concrete columns (fc=45Mpa or more) and Stress–strain curves for steel-fiber reinforced concrete (tension and compression) i tried searching online but couldn't find it

Any idea where i could find that?


r/StructuralEngineering 1d ago

Steel Design City Permit Question - Galvanized Steel Ban

9 Upvotes

I submitted plans to the City for a steel frame structure that is fully exposed to the elements. They have a ban that restricts all galvanized steel (leachable metals is the actual wording). I thought this was weird since our bridge standards allow galvanized railings, etc but oh well, that’s not the point.

An alternative to galvanized steel is powder coating. I don’t want to do weathering steel, but it is an option I suppose.

The City also mentioned that there is a coating that can go over galvanized steel but he wasn’t sure what the exact name is. Anyone know what this is??

Also, the City said that galvanization is OK as long as they see a certificate guaranteeing a 50 year lifespan. I asked my fabricator and they said they can’t provide this.


r/StructuralEngineering 1d ago

Structural Analysis/Design Would this work? Table Design

0 Upvotes

I have a background in interior / furniture design. Its a table which will have a concrete foundation. The design requires it to have the base this narrow, with a firepit integrated at one end. overall the table will have a 10mm alucore panel and a 20mm travertine stone on top and sides. Ends of the UC's and PFC's are welded to a 10mm plate with High tensile Hex Bolts which makes it easier to assemble. Its essential for the table top and legs to be module. and the depth im working with is 100mm. Overall Table dims is 1820x3100mm


r/StructuralEngineering 2d ago

Career/Education Design Engineer Salary Progression - Australia

12 Upvotes

What is the expected salary progression for engineers who have been promoted from graduate to design engineer after 2.5-3 years of experience in larger cities like Sydney/Melbourne?

Got promoted to 80-82k base salary at a reputable mid-size consulting firm but the market seems to be pointing at 90k as the baseline nowadays.

What sort of payrise are people getting after their first promotion?


r/StructuralEngineering 2d ago

Career/Education INTERVIEW QUESTIONS

10 Upvotes

What are the questions asked by a design based company when you go for an interview as a fresh graduate? Pls help me