London Orbit vs Eiffel Tower

If you design buildings for a living you spend a lot of time thinking about what makes a good building. Which buildings do people most enjoy being in ? Which buildings are people most proud of ? Which buildings use materials most efficiently ? I remember an ex-colleague who was a structural engineer who liked to argue that the best buildings had a unique silhouette. So by that measure these are two strong contenders the ArcelorMittal London Orbit in the Olympic Park in Stratford, London in England vs the Eiffel Tower on the Champs du Mars in Paris, France.

The Eiffel Tower is the oldest. It was built for the 1889 World’s Fair in Paris. Eiffel’s company developed the design which they submitted to a competition. They won and were granted 1.5 million francs to construct it (less than a quarter of the estimated cost). He paid the remainder of the construction cost himself in return for the proceeds from it’s receipts for the first twenty years of its operation.

The ArcelorMittal Orbit is much more recent. It was built for the 2012 Olympics in London. A competition was run for an Olympic Tower. The winning design was by Anish Kapoor (a sculptor) and Cecil Balmond (an engineer at Arup). The London Development Agency provided £3.1m funding (less than a sixth of the estimated cost). The remainder was paid by ArcelorMittal (a steel company) who constructed the tower.

Each tower has two observation decks. They also have their own distinctive features. The Eiffel Tower is one of only two known buildings in the world to have an elevator on an incline (the other is in the town hall in Hannover, Germany). The ArcelorMittal Orbit has what is believed to be the longest tunnel slide in the world which is 178m long.

The Eiffel Tower is 330m tall. Before it was built the tallest free-standing structure in the world was the Washington Monument which is 169m high. It is constructed of wrought iron. Wrought iron was a precursor to steel, it has some strength in tension but is anisotropic (formed in layers) and the failure stress is very variable. The Eiffel Tower’s shape is similar to a pyramid, which is a very efficient shape adorned with pediments and the arch for aesthetic flourishes. It is believed to have been analysed using integrals and graphic analysis carried out by hand. The structure weighs 7,300 tonnes which is equivalent to 22 tonnes/m height. The additional elements such as lifts, shops and antennae bring the total weight to 10,100 tonnes.

The London Orbit is 114m tall built of steel. The shape was designed to use “instabilities as stabilities”. It would not have been possible to build using wrought iron as the reliable strength is lower than modern steel. The required quantities of materials could not have been reasonably calculated without modern advances in computer analysis. The overall shape is irregular and unbalanced which requires more structural materials for a given height. The structures has approximately 2,000 tonnes of steel, which is equivalent to 17.5 tonnes/m height. Some crude approximations suggest that this could have been reduced by about half if a more efficient shape had been chosen.

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Best Structural Engineering Jobs

I gave a guest lecture recently where the students – having heard that I’d had a range of jobs – asked what the best structural engineering job was for a graduate. Should they use their structural engineering degree to get a job as a structural engineering consultant? Or as a structural engineer working for a contractor? Or even should they pivot from structural engineering and look for a graduate job elsewhere? A structural engineering degree gives you lots of career options and hopefully you will get a good job and even if you’re lucky have an interesting career that best matches your unique strengths and interests. There are no perfect jobs but these are some of the things I have seen and learnt from my first-hand experience.

General

I have worked in different countries and in a wide variety of jobs in the construction sector. For the sake of this blog I will let you know about three that I have done in the UK. Working for a contractor, working for an engineering consultant at a big firm on big projects and working for a small engineering consultant on small projects. 

If you have a structural engineering degree you are amongst the cleverest and most educated people in the world. Not many people have the abilities you have and even fewer progress to get chartered. It is a respected profession because of how much money is spent on buildings and infrastructure and the important role we play in ensuring safety and in many other ways too.

It offers good opportunities to work abroad particularly in countries where the economy is booming or which are building infrastructure for the first time. It also has lots of transferable skills that are highly sought after – problem solving, team work, dealing with uncertainty, communicating in different ways etc.

In the UK it is quite common to change what career you do, sometimes many times. My friends and ex-classmates who have decided to do other things have used their structural engineering degree as a basis to be a construction lawyer, a civil servant, an entrepreneur, an insurance assessor, a software designer, a management consultant. Even to fund their real passion, being a sports referee!

Working for a Big Contractor on a Big Project

The main advantage of working for a big contractor is seeing things built, doing an active job with a tangible result.

Contractors employ structural engineers for setting out, to manage packages and to check quality. There may also be other responsibilities such as duties related to health and safety or managing budgets.

A simple definition of setting out is measuring where things should go. It involves working alone or in a pair with a tape measure, a theodolite or a total station to fix measuring points so the different trades know where to build. For example knocking pegs in a muddy field to show where the building should be built or marking accurately with a sharp pencil where a wall should go. It can be really fun if you’re doing it with someone you enjoy chatting to or it can be quite stressful if there are people waiting for you to finish before they can start their work.

Managing packages means managing a part of the project for example the foundations or the lightning conductors. It involves managing other people, often other companies and maybe senior people at those companies with more experience than you. Making sure all of the necessary planning has been done and regularly checking progress.

Checking quality is making sure everything has been done correctly. It might mean measuring a steel post has been installed vertical enough or going through a checklist before concrete is poured. It involves engineering judgment about which defects matter and how they can best be sorted out.

I think in general contractors earn more than consultants and you get to progress faster to managing people possibly within the first few months in the job. It is easy to travel and people can invest in property in different locations which supplements their income. 

Your skills are likely to be highly valued on the construction site because there will not be many engineers. On the other hand this means you will be straight in at the deep end and there will be less people to learn from or to ask advice. The particular contractor I worked for did offer lots of formal training opportunities which I found very helpful.

It’s a job particularly attractive to extroverts who like lots going on and being outside and talking to people. I am somewhere between an introvert and an extrovert and so enjoyed meeting a range of people but also found it one of the most tiring jobs I’ve done.  I was required to fill out a diary every day and there was lots of other form filling. The quality checks required prolonged concentration which reminded me of a job interview as I had to make engineering decisions under pressure.

As engineers progress to be more senior they generally do more management (meetings, emails, form filling) and less time on site. Alternatively you might be headhunted by one of the sub-contractors as I was after less than a year or some people also go on to set up their own development companies.

Unlike working for a consultant it will be many years before you are senior enough to meet the client and you will work on less projects over your career, albeit in greater depth. It was a long working day from 8am to at least 6pm and people didn’t seem to have hobbies or meet friends (other than colleagues) after work. Compared to other places I worked the average age was older and there seemed to be a higher proportion who’d had relationship breakdown but maybe that was a coincidence.

Working for a Big Consultant on Big Projects

The main advantage of working for a big consultant is getting to work in a big team of like-minded people and possibly working on big projects people have heard of.

Consultants employ structural engineers to design projects often working with architects or contractors. There may also be inspections of existing buildings, site visits to check construction or possibly expert witness work advising lawyers.

You are quite likely to work on a few projects a year ranging from early concept design to detailed construction information. At the beginning you will be doing mostly load takedowns and member analysis (structural calculations). There are typically more options considered than on small projects which means re-doing the design lots of times until the best solution is found. 

There are lots of people around with relevant experience to learn from so you don’t always have to ask the same person for advice. There may also be good internal training opportunities or a graduate scheme. The teams are often fluid and so if there are people you don’t click with you’re not stuck with them forever.

Compared to working for a contractor there is more work-life balance although there can still be sustained periods of late nights or weekend working depending on the project and your boss. A lot of the buildings you design will never get built. 

Structural engineering consultants at big companies typically earn less as there is so much competition to work there. As structural engineers progress at a consultant they get to work more autonomously although it typically takes quite a number of years before you get to meet the client or have significant management responsibilities.  

This option is the most rewarding for talking to people socially about which project you are working on. Seeing how impressed people with no connection to engineering are that you worked on a particular project makes you realise what a great job it is.

Working for a Small Consultant on Small Projects

The main advantage of working for a small consultant is having a varied job, meeting the clients, getting a broad network and seeing lots of projects built. 

The type of work is similar to working for a big consultant but spending less time on each type of activity. There is generally less focus on member analysis (maths) and more on structural detailing (drawing). There will also be lots of site visits.

You are quite likely to work on up to thirty projects a year ranging from early concept design to detailed construction information. They may also be business tasks you can get involved with and help shape the company culture.

The pay is generally better than big consultants and you progress faster. The projects are unlikely to be so well known but may have important or famous clients. It’s quite likely you will meet numerous clients in your first year. 

This option is the most rewarding for getting a variety of experience as quickly as possible. As the team is smaller you will get to know people better but that also means it’s extra important to get on with everyone. You will have lots of exposure to the boss so if they are good you will learn a lot. 

Conclusion

A structural engineering degree opens doors to a variety of interesting and stretching careers. You might choose to work for a big contractor to see things built and do an active job with a tangible result. Or work for a big consultant in a large team of like-minded people working on big projects which people have heard of. Or you may choose to work for a small consultant to get a varied job, to meet the clients and see lots of projects built. 

Unfortunately there are no perfect jobs but whichever way you choose to go I hope you have an enjoyable career that best matches your unique strengths and interests.

How can I lose weight quickly?

Emily was doubting herself. “How can I lose weight quickly?” she thought as she looked first at her design for the concert screen and then at the stacks of now useless parts. Beyoncé started rehearsing her final song “Remember those walls I built…” in the background, Emily felt sick. To be able to lift the screen into place, she would have to use all her engineering skill to lose weight from the structure with only six hours left.

Dan, the construction manager, wasn’t helping. He always thought he knew best, and he just couldn’t bring himself to accept that the crane wasn’t going to start again. He had his eyes closed, phone pressed to his ear and was talking passive aggressively as he rubbed his shaved head “Just try and start the crane engine one more time. We really need this”.

She tried to think of happier things to calm herself down. She thought of Thomas, then her mind wandered to the camping holiday they were planning. Then she had a brainwave.

Guy ropes! The structure wouldn’t need to­­ be so strong and heavy if we stabilised it with guy ropes! She’d seen a drum of wire outside for the lighting rigs that she could use. It wasn’t perfect but if she re-designed it carefully, the wires wouldn’t block people’s views. She crouched down, and flipped her drawings over, sketching the new design in biro on the back, while resting them on her knee. To check that it was strong enough, she did some quick calculations on her phone, while talking softly out loud and jotting things down “1kN/m2… 6mm diameter wire.. cos theta.. tension force.. bending moments.. expected deflection..”. There that should do it. She’d write it up properly later.

Dan was shouting into his phone “Come on, it has to work! Try again! Switch it off and then back on again!” She took the phone out of his hand, and handed him her new design.

“Here you go, all sorted”

Dan looked like Emily had cast a stupefy spell over him.

“No need to thank me, just some VIP tickets for that box over there will do it. I’ll see you in five hours, I need to go and get changed!”

Structural Engineering Blogs

If you’re interested in structural engineering, you may have found that it’s not the easiest profession to learn about. There are a few sources – there are some organisations that are trying to raise its profile, there are a few good books and some youtube videos.

I found the most helpful was talking to a family friend who was a structural engineer about what it was like. He had trained as both an architect and engineer, worked for a famous company, and then was lecturing and inspiring others by teaching creativity and good design.

But for those who don’t know any structural engineers, I think personal blogs are a good place to start. I’ve found blogging to be a lot harder than it looks, so these people are obviously very passionate about what they do to have been so persistent in writing about it. I hope they open up another world for you.

The Happy Pontist – I love this blog. HP’s infectious enthusiasm is backed up by an incredible depth of knowledge. Structural engineering is designing how things stand up, which could be for anything, but the particular fun with bridges is that the structure is on display (unlike most buildings for example). Very difficult to pick favourites from amongst the 750+ posts but would recommend this one on one of Robert Maillart’s gem’s in Switzerland, and this piece of one of Calatrava’s bridges that broke the mould.

My Passion for Structural Engineering – was a popular blog written by Waseem Rana that has now been taken down. I was inspired by the layout he used when I was setting up my own blog.

Civil Engineering Gyan – I enjoyed reading this blog, which is co-authored by Rakshita Nagayach an Indian civil engineer by training, and a prolific blogger (this is just one of hers). She writes on a wide range of topics related to engineering but I particularly enjoyed this post about great engineers. It’s nice to hear a few names outside the British and American ones I’ve heard of elsewhere.

Being Brunel – This blog inspired me to start my own blog but has now been taken down.

Structural Madness – If you’re lucky as an engineer you get to work at the cutting edge of what is possible, I think that is what co-authors Jinal Doshi and Darshan Pala mean by the name of their blog Structural Madness. For example, some people may have considered it madness when the the Burj Khalifa smashed the world record for tallest building by 300m; but it has proven to be a success. This blog, started when they were both in Grad School in the US is the top result when searching for structural engineering blogs. They tackle difficult concepts but use lots of pictures to make this an accessible way to learn about structural engineering.

If you liked this blog post, you might also enjoy my post about good books about structural engineering or go back to the homepage to see other options.

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Clifton Suspension Bridge: How Brunel Avoided Disaster

Two weeks ago I was back in my university city of Bristol, and had the chance to have a guided tour of the Clifton Suspension Bridge. I’d heard previously that one of the abutments was hollow, and I was secretly hoping that we would get to abseil into one of them, but it wasn’t to be. One thing did really strike me though during the guided tour.

The Clifton Suspension Bridge built in 1864 was famously designed by Brunel. It wasn’t built in his lifetime due to a lack of funding but was then erected in memorial to him after his death. It is the picture postcard advert for both the city of Bristol and engineering in general; however based on what the guide said, I think it could nearly have ended in disaster.

The bridge span is 214m and the width is 9.5m. Therefore the ratio of span/width is 22.7. As far as I’m aware in Brunel’s time that wasn’t a ratio that people considered but it’s become significant since 1940 when the Tacoma Narrows Bridge collapsed. That had a span/width ratio of 71, which for the technology at the time was the highest of any bridge in the world. It really pushed the boundaries of innovation, but unfortunately the designers weren’t aware of the impact this would have on the resonance of the bridge. And as you can see in the youtube link here it oscillated in even relatively light winds until it was torn apart only a few months after it was finished.

What the guide said that caught my attention, was that Brunel’s design had been for one horse and cart, but after his death, the bridge design was widened at the request of one of the donors, who wanted two horse and carts to be able to pass each other. The bridge also now has space for pedestrians either side.

Could it be that Brunel’s original design was only 3m wide ? If so then it would have had a span/width ratio of 70 and could have suffered the same fate as the Tacoma Narrows Bridge. Who knows but maybe that extra horse and cart was the saviour of Brunel’s reputation!

If you’d like to read more about engineering failures, you might like this book I reviewed.

Book Review: To Engineer is Human

Lots of meat, without the maths that makes it hard to swallow.

When I was preparing to apply to become a chartered member of the Institution of Civil Engineers, a mentor – I think as a warning against complacency – challenged me that I should be reading at least 6 books about engineering a year. From my experience, most engineering books are text books, so I asked him which books he suggested, and he couldn’t think of a single example of a readable book about engineering!

Petroski’s books then are rare gems of attempting to span that large distance between the remote island of engineering knowledge and the mainland of public imagination. Reading it as a structural engineer there was plenty that I was already familiar with, but also lots that was new. He draws on examples from both sides of the Atlantic, so having learnt my trade in the UK I found the discussion of iron bridges particularly Othmar Ammann (Quebec Bridge) and the Roeblings (Brooklyn Bridge) fresh and new. While others may be less familiar with Beauvais Cathedral, cracks in Big Ben or Paxton and the Crystal Palace.

His opening chapters suggest that the book is for a non-technical audience, but he sometimes lapses into advice for professionals such as lamenting that our drawings are no longer as beautiful as Galileo’s. The vocabulary is probably only accessible for teenagers and up (discussion of monographs, commissions, cantilevers etc.) but other than that, in my opinion it is accessible for a non-technical reader.

If I was being picky, I would like to have seen an over-arching story arc. Like there is in the excellent Fermat’s Last Theorem, which keeps you turning the pages. Petroski has research and includes an impressive amount of breadth – references to nursery rhymes, poetry, photos, quotes and lots of stories – but there is no one thread drawing it all together.

I think it could also benefit from more detail of the human side of the characters. For example my impression is that Brunel was quite a risk taker, he sought his father’s advice for the Clifton Suspension Bridge, but then ignored it when he was advised to include a central support; which was quite bold for a 20-year-old designing the longest spanning bridge in the UK!

So in summary, this book is a good introduction to engineering with plenty of nuggets and reminders for the more seasoned professional. It’s not a gripping page turner because there isn’t an over-arching narrative arc, but I enjoyed reading it and got several pages of quotes and stories from it that have broadened me out a bit and I’ll no doubt use again.

Emily was an engineer

This story is for Lucy, an undecided 15 year old, wondering what to do next.

Emily was an engineer.

“Is that like an architect?” asked Thomas as he gazed at her steadily, placing his wine glass carefully back on the table.

“kind of, not really”.

She’d met him online – well to be honest on Tinder. So she knew he had a nice smile, but in person he had quite a presence too. He had nice shoulders. They’d texted a few times, then a lot. He’d rung her while she was swimming, she’d rung him back. He’d suggested this little place and now here they were… talking. It was all a bit awkward, but in a good way.

“architects are like GP’s, structural engineers are like brain surgeons”

She liked putting it like that. It sounded more dramatic than just saying she was a specialist. And it wasn’t just brain surgeons that were smart, it had been such hard work becoming an engineer, and now she’d got chartered as well. It was a real achievement, so she forgave herself for a bit of boasting. It was a first date after all. And those letters after her name had required all her intellect and all her persistence. She studied maths, science and art for A-level. Then she’d had done a masters in engineering at university, with placements in different firms over the holidays. After working for a few years, she’d got enough experience and responsibility to pass the Institution of Civil Engineers membership process.

“oh really” Thomas looked impressed. “So what kind of stuff do you do?”

She noticed while he was talking that he had freckles on his nose. And she was about to answer his question when the pizza arrived (she’d asked if they could get a big one and share, so she could test his generosity – and make sure he didn’t eat any garlic!). They refilled their wine glasses from the bottle and chewed thoughtfully in silence for a few minutes.

“well.. “ she tried to think of a good way to explain it. Thomas caught her gaze while she was staring at his arm muscles, he smiled, but she was sure she was blushing. Before it got any worse, she stammered on.

“well … have you ever been to a gym where the floor was bouncy ?”

“yeh my one at uni was like that”

“well one thing I do, is I advise architect’s how to stop that.”

“oh”

“I guess you could say structural engineers design the skeleton of a building, how it stands up. But every building is different, so every structural skeleton we design is a bit different. Weight-lifters need bigger bones than jockeys, women and men have different skeletons. Our bodies just adapt over time, but when you’re designing a block of flats you have to know how big the skeleton will be, before you start the foundations. Most buildings you can’t see the skeleton, but sometimes you can like the Eiffel Tower, or the Millenium Brid..”

Emily was cut short. She’d been getting quite passionate about engineering and been waving her hands about, she was just about to talk about her favourite structures, when Thomas seized the moment and leant in for a kiss.

What’s the point of having a structural engineer?

Building is expensive. The recent financial crisis proved that construction is a luxury, because during hard times we can do without it. For many people, property is the most expensive outlay in their lives. So when it comes to embarking on an expensive building project it’s important to make sure every pound counts.

So avoiding hiring a structural engineer may seem an easy saving. The Romans built all their great structures with an architect to provide the vision and experienced builders to make it stand up. What’s a structural engineer for? What’s the point of them?

What you get with a structural engineer is someone who can – using a scientific approach – tell you exactly how much structure you need. One element of that is judging the strength of the structural frame. In order to design a structure that is strong enough without additional materials, which are wasteful and expensive.

A brilliant demonstration of the potential of structural engineering came from a group of students a few years ago. They had to build a dome structure, 40cm high and hollow, with a kilo of spaghetti and some glue. The winners would be the group that supported the biggest weight with the least spaghetti.

A common sense approach might be to use triangles to make the dome shape. To make it easy to build you might use the same size triangles throughout and estimate the strength by averaging out several different people’s opinions. A reasonable strength to achieve from a bag of spaghetti is hard to gauge, maybe a few kilograms is achievable.

The engineering students in question, tested the spaghetti to calculate its material properties (how much force it could take and how much it bent for a certain amount of force). Instead of designing the whole dome as one unit, they approached it as a series of 10 arches, which combined together make a dome. Using some trigonometry they were able to work out the best shape for the arches. They then used some engineering software to check that there were no particular weak spots and that the whole structure would be working hard before any one part broke. By separating the dome into 2D arches, they could build the dome flat and them assemble it, making it easier to build well.

Spaghetti dome 3D and section
Spaghetti dome 3D and section

So what was the benefit of having a structural engineer? Well if a smart person had designed something and built it well, it might be expected to hold a few kilograms. The ‘engineered’ spaghetti dome held 195.5kg! Slightly more than the 190kg predicted. It performed so well that the engineering department had to bring in a new testing rig, as their first one only went up to 100kg.

So what’s the point of having a structural engineer? Well a structural engineer helps you to get every ounce of strength out of the structure. So although their services cost money, they can design something which is easier to build and without additional materials, which are wasteful and expensive.

What makes a good engineer?

We were off to the pub. I was walking with two architects with a mutual intent to enjoy the sunshine with a glass of something fermented in hand. We’d just made a careful incision through the London traffic. Suddenly the conversation opened up and one of them asked me exactly what was it that made a good structural engineer. Good question. Obvious question maybe, but not something I’d ever heard posited before. And looking back I was quite pleased with what I came up with in the space of a few pounding heartbeats.

If they’d asked what a structural engineer does, that would have been easy. Hours spent sketching or calculating the size of bending moments are not quickly forgotten. Or you can just ask Google. For example the Institution of Structural Engineers website explains that ‘Structural engineers design, create, solve problems, innovate and use maths and science to shape the world.’

But what’s the difference between a good one and an average one? What does it mean to design better, solve better or innovate better? Are good engineers mined from exotic locations? Or can they be moulded? Are they like wizards, born of engineerkind. Or are they more like hobbits, who just need an invite to a great adventure to rise about expectations?

I mean obviously it’s subjective. There’s no golden rule to measure engineers by. Of the many good engineers who have achieved fame – Brunel was lauded for his bold innovation; Peter Rice thought it was about imagination and Bill Baker gives the impression it’s all perspiration.

I mean a good engineer must be dependable, scientific, able to think through a situation logically, prudent, a good communicator, understand contracts, party wall agreements and the management of risk. They must have integrity, work to improve the environment and ensure worker safety. They must be cautious but brave, striving for the best while preparing for the worst. They must be lifelong learners, questioning, curious. Widely read and deeply knowledgable.

But I wanted to answer succinctly. To lay down the shield of jargon and the breastplate of verbosity and wrestle with the question unarmed. I didn’t want to give a list post – the 37 things that all good structural engineers do and how you can emulate them. I wanted something pithier, punchier, peppier. I wanted a tweet not a novel.

To cut to the crunch, I feel that if you boil it all down, what separates the good from the rest, is that the good ones understand what everything does. This means that crucially, they know what you can justify doing without. It’s tempting to add strength to the structure to cover the weakness in our understanding. The better the engineer, the less structure you’ll get. Good engineers give you less. Less is better. Less is more.

So back to my conversation. The good question about good engineers. Well after a deep breath I slowly opined ‘a good structural engineer knows exactly what’s needed’. And I’m still not sure how I would improve on that.