Some initial thoughts from an earthquake engineer on the collapse of the apartment building in Tainan

There has been a lot of coverage of the total collapse of an apartment building observed in Tainan after the earthquake a few days ago. This blog takes a very initial look, using only the information available through news outlets, to try and start to understand what happened to cause this catastrophic collapse.

The structure concerned is the 17 storey Wei Guan Jun Ling apartment complex. Having had a look on Google street view I have found what I think is the building that has collapsed. These are views from the front and back:

View from front of collapsed building (from Google street view)

View from rear of collapsed building (from Google Street view)

It is obvious that the building has overturned in the direction shown in the diagram below. The apartments on the top 14 or so storeys of the building remain (relatively) intact with most of their damage likely to have been caused by the impact of it falling to the ground.

Collapse mechanism of structure

When we come to look at the bottom two storeys of the building, this is where this building's major weakness is clear. The diagram below highlights a possible soft storey (see red box). This is likely to have caused the overturning of the entire structure by either:

1. the collapse of the soft storey, particularly at the front (i.e. the white circled columns); or
2. the difference in stiffness between the apartments above and the soft storey below causing failure at the junction between the two (i.e. at second floor level).

Looking further through photos available online I found this photo (below). The photo appears to show (as far as I can tell) the ceiling that you would have seen if you had been standing on the first floor (on it's side). The walls and columns have ripped off the structure below, leaving steel reinforcement dangling. This gives some weight to the theory of the overturning of the building being initiated by a soft storey failure (see point 2 above). Additionally it is worth noting that the white circled columns above are orientated to offer less support if the building was trying to overturn towards the main road (as it did in the end), which gives weight to point 1 (see above).

http://edition.cnn.com/2016/02/08/asia/taiwan-earthquake/

It is clear that something significant was wrong with this structure. It lies on its side, whilst buildings next door have even managed to keep their windows intact (windows are often the first thing to break in earthquakes). Much of the discussion has focussed on poor construction of the building. The photo below appears to show tin cans in the bottom of a floor slab (although again I can't be sure). Filling concrete with 'junk' obviously reduce the concrete costs on a building site and is obviously a sign of poor construction, possible poor design, and poor building control (i.e. poor checks by government enforcers or designers as to whether the building is being constructed as it was designed). Depending on the extent of this 'junk-filled' concrete, this might also be a contributing factor.

http://edition.cnn.com/2016/02/08/asia/taiwan-earthquake/

It just goes to show that reinforced concrete structures are very complex buildings to design, and construct, and once built they can be very hard to assess for their vulnerability (as all of the weaknesses are hidden inside the concrete).

But the bottom line is, again, that poor construction and lack of enforcement of building regulations continue, unnecessarily, to kill people in earthquakes.

Where are all of the engineers?

I'm biased, but I think engineers are pretty awesome. Turn on a tap and water just appears! Turn on a switch and a room is brought to light by a glowing pice of metal! Descend underground on magical moving escalators and take a train across a city! Fly around the world in something that weights 650 tonnes - not being an aeronautical engineer even I think A380s look and feel like some sort of wizardry!

WOW - engineering is essential to so much in human life. It solves every day problems with pragmatic solutions that are useable, useful and used.

People may consider engineers to:

Here's another definition:

Credit: http://www.amazon.com/ComputerGear-Engineer-Definition-T-shirt/dp/B009QR8P64/ref=pd_sim_a_11?ie=UTF8&refRID=1TE81YEM838ADXDMCQKB

So, now we have my 'unbiased' opinion cleared up (!), here's my question:

Why are there so few engineers involved in solving the problems of disaster risk and development?

The above skills strike me as a very similar set of skills that are needed in the field of Disaster Risk Reduction or DRR. To reduce disasters we need problem solvers, who can keep to a budget, who can think about future issues, who collaborate daily, who achieve results. Engineers have the attributes and inherent characteristics of the people who are needed.

So where are we?

Designing mega structures to be proud of?

Struggling for a 3% profit margin (much less than is deserved!) on city projects?

Delivering Olympic Parks?

All of these things are needed and are brilliant. But there must be more of us that care about humanitarian issues; that feel responsibility when we watch pictures on our screens of Haiti flattened by poorly designed concrete that we know, if we had designed, would have stood up and not wiped out that family. There is so much good work engineering work going on in developing countries, but there needs to be much more.

I recently attended the Pai Lin Li lecture at the Institute of Structural Engineers in London about transition shelters used by two NGOs in Ecuador and Haiti. But although these organisations are trying to provide shelter to vulnerable families, actually, they could be making them more vulnerable by providing shelter that is not engineered. And you know, engineering doesn't always make things more expensive. Actually, very often the opposite. We know how to design buildings. We know where to save on materials and where to reinforce. As a practising engineers, delivering money saving solutions is our job description!

Today I found out that Architects for Humanity are closing. Known for their great strap line 'Design Like You Give a Damn', and enigmatic founder Cameron Sinclair (here is his 2006 TED talk) this is one of the organisations that inspired me to do what I am now. So it's a sad day for them, me and for this type of work. Lack of funding is quoted to be the main issue: 

"It is that humanitarian design isn't considered a fundamental right. And that today, in San Francisco, it is easier to find funding for an app than to fund an organization which transforms lives."

So, here's my challenge. Let's stand up, be engineers and deliver engineering solutions to the developed and developing worlds. Let's 'obnoxiously insist' that things are 'done the right way'.

Here are some links to some organisations that might inspire you to get involved:

Architecture for Humanity

Build Change

EPICentre at UCL

Arup International Development

Engineers Against Poverty