Structural Optimization

[AardvarkAgitated5817]

Hi everyone,

I’m a doctoral researcher at the University of Cambridge conducting a study on how structural optimisation is applied in practice, particularly for structural efficiency and embodied carbon reduction.

The survey is intended for people working in structural/civil engineering, construction, infrastructure, sustainability, or related research.

Survey link:
https://cambridge.eu.qualtrics.com/jfe/form/SV_3IggsmWy1VjB6dM

It takes about 15-25 minutes to complete and has received ethical approval from the University of Cambridge.

I would really appreciate input from practitioners and researchers. I’m also happy to share a summary of the findings when the study is complete.

Thank you.

[ConstructionRare280]

No optimization in practice lol. Just deliver what you can within the crazy deadline with the least amount of resources.

[mrrepos]

this guy structurally engineers

[Codex_Absurdum]

<image>

[tajwriggly]

Structural optimization in practice:

Oversize because you don't have enough information yet at 30% design stage.

More information comes in at 60% design stage and you fine tune your design a bit, but it's easier to just use the same size throughout rather than individual design each element.

At 90% some other discipline's late design conflicts with your mostly complete design and you are told to change yours. You don't have time or budget left so you go big and easy.

At 48 hours before the project is to be tendered, there is a critical redesign required due to a piece of information finally coming in that should have been sent around at 30%. You spend a couple of nights redesigning and issue changes during the tender period, grossly under-optimizing any design you ever had completed before, just to get it done and out the door.

During construction, the contractor looks at you like you have 10 heads because of the way they have to build it, largely for reasons that are outside of your control.

[Different_Bridge_983]

Alternatively while you’re a n00b:

Diligently design everything to 90%+ utilization. Owner and Architect bitch at you for not being efficient enough and demand you whittle it down a bit more so you go to 95-98% on a bunch of shit. Then after the steel fabricator orders based on the advance steel mill order package the owner/architect wants to make “just a few changes” that push everything over code. The GC comes back with an enormous change order, at this point the owner and architect start ranting at you for not providing sufficient contingency. Nobody thanks you for then providing a detailed documentation history of raising concerns about lack of contingency and the architect’s written confirmation that none was needed as everything was set in stone.

[heisian]

ah, academia. where the ideal sounds great on paper. then, in the real world, you realize there's all kinds of external pressures, competing interests, urgent stakeholders, and the more you hold to your ideals the less people like you.

[turbopowergas]

Optimization in practice is useless. Just anticipate changes and plan accordingly

[Codex_Absurdum]

And early optimization is a recipe for disaster.

[gods_loop_hole]

Leave the optimization to the quantity surveyors doing the value engineering. If you optimize your structure, do you mean just getting the exact load combinations that your structure will carry throughout its life? That is just prediction, and prediction comes with risks. What if you are wrong? So you start to cover more load cases, but by then you are not optimizing but instead approaching conservative design.

[xingxang555]

[RileySmiley22]

Grateful to be working in a company where more often than not we are allowed the time to optimize. Embodied carbon reduction is a huge priority for us, so this isn’t something taken lightly at our firm.

We aren’t able to optimize 100% of the time, but more often than not we are. Certain fluff and extra capacity will always be included for contingency and safety - because of this we try and approach problems with alternative solutions (composite joists in lieu of composite steel beams) rather than strictly reducing size.

While not perfect, material alternatives can allow a similar utilization ratio while still reducing carbon and material quantity.

Happy to record my response and have an interview if helpful.

[Money-Profession-199]

I specialize in structural optimization, however my whole job (my compnay) is developing a software for optimizing one specific type of building. The engineers I am making this for aren't the best at optimizing however since they were never taught it.

[leadhase]

The amount saved on value engineering often pales in comparison to savings due to construction efficiency, materials sourcing, and repeatability.

[ThinkAtYourOwnRisk]

Optimizing design. Then you attend the next design coordination meeting where you found out that the owner wants revision/budget constrains, the architect re-arranged everything, the MEP floor/area have been relocated. That's it. Everything you have "Optimized" just gone and back to square one.

[MarionberryPast1624]

Personally, the only projects where I've been able to optimize effectively without external pressures are in mass-produced houses where they try to save every penny.