Heavy Light - Fabric-Formed Concrete Structures
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- Опубліковано 29 чер 2011
- New architectural and structural forms are being produced at the Centre for Architectural Structures and Technology (CAST) through very simple construction methods that use flat sheets of fabric as formwork molds for reinforced concrete construction. This lecture will present some of the many ways in which extraordinarily beautiful and efficient architectural and structural forms can be constructed using simple tools and methods. Some of these methods promise substantial reductions in the consumption of building materials in concrete construction. All of them point towards a way of doing architecture that seeks a sufficient complexity through extraordinary simplicity.
Prof. Mark West is the founding Director of CAST, the University of Manitoba's Centre for Architectural Structures and Technology in Winnipeg Canada, and is a Professor of Architecture at the University of Manitoba's Department of Architecture and Department of Civil Engineering. His work joins the usually separate worlds of drawing, sculpture, structural design, architecture and construction, and has produced, most notably, numerous methods of forming concrete structures in flexible fabric molds.
www.umanitoba.ca/cast_building
Date: Wednesday, June 22nd, 2011
Time: 14.00-15.00
Place: Science City (Hönggerberg), Wolfgang-Pauli-Strasse 15, HIL E 3
Hosted by:
Prof. Dr. Philippe Block
Ir. Diederik Veenendaal
Assistant Chair of Building Structure
Institute of Technology in Architecture
www.block.arch.ethz.ch
A real scientist: intuition, doubt, vulnerability, failure.. stay excited Mr West!
I very much like the Idea or Concept that the Structure expresses and responds to the forces applied which is very much the way Nature does everything in Self-Organizing Principals. This results in great efficiency, strength, lightness and beauty of our Habitats and everything else we create for that matter. A very "Intuitive" approach to design... Thank you for your work and presentation! :)
I love how this guy has one foot in pure conceptual space, and one foot in the pragmatic space. I would love to be doing this kind of work.
i wonder if you can make a space ship with hard setting textiles.
The 2D hanging sheet experiments makes an incredible case for analog computation/simulation. I wonder if CAD simulation would've been able to predict those buckling points.
I'm a sculptor and I feel inspired by this! Thanks!
This is one of the more interesting videos from a physics standpoint that I've ever seen. Brilliant guys. The possibilities are almost endless. I'm very interested in putting aircrete in the mix for low cost housing. We have a couple of million people now homeless in American and 1.5 billion world wide.
i guess I'm kind of off topic but does anyone know of a good site to watch new movies online ?
@Jerry Mekhi thanks, I signed up and it seems like a nice service =) I appreciate it!!
@Bennett Kaiser Happy to help :D
Amazing concepts, I especially like the sagging fabric into a archway concept. Lines of tension in a relaxed fabric become thrust lines in a solid structural object. God damn I love math.
do the sagging method, flip it upright, and have a cool dome shape.
Really, really cool! This reminds me an awful lot of the work of Frei Otto at the ILM, these are all just self-forming inflatable structures. [just?] Block's growing bones out of concrete.
10:00] "Devil's in the details" for sure, don't forget the lift-slab failure at L'Ambiance Plaza, too much reinforcement wound up concentrated at the column connections and not enough concrete - 28 dead.
Starting at 18:00] Of course the geotextile is not a soap film so it's not isostatic??? So, this is what generates the buckling, the excess fabric has to go somewhere so it deflects and forms buckles until it becomes isostatic again??? optimized along the principle lines of compression stress?? Buy why optimized? Who has the answers to this question? I'd probably look first in the mathematics department, this seems as much a topology problem as an engineering problem. It seems intuitively obvious that with an isostatic surface that the stresses are being placed exactly along the stress path, not above, not below, and not to one side, so long as the fabric is sufficiently stiff... but if the fabric is insufficiently stiff it will stretch locally and you loose isostatic once again. The fabric must be free to flex but not to stretch, unlike the soap film, which agrees with what Block said about the strength of the fabric, its probably never stressed enough to stretch significantly.
41:40] Ok, finally he brings in inflatable structures. But you don't want to start putting pantaloons on piano legs.
44:55] Bones finally.
47:00] The energy available in the surface of the buckle to form a new branches diminishes suddenly after three?? because the y-buckle itself is stiff enough because of its 3-ness to simply push unbuckled fabric up into new buckles?? rather than form new branches? or these are one and the same thing?? The fabric is isotropic enough that it isn't an artifact of the weave?
50:00] With a self-compacting mix it's got to be a huge advantage with the fabric mold to get rid of all of the excess water - especially in Winnipeg winters.
54:00] Instead of 'hang and spray' maybe 'dip and hang?' or pre-pregs that hang and cure?
Well done Prof. Block.
I think I might have an idea when you talk about “buckling” at minute 19:30. I seems pretty simple to me that the fabric and the natural form and only shape that it can become under load, is simply allowing more material to be built up in thickness to strengthen the naturally weak narrowing corners. It’s pretty simple really, if you were to have a square (depressed or not) shape of material of uniform thickness it would break more easily as it’s width reduced and became narrower, i.e. toward the corners.
So yes you were right in your instinct that this was a good thing.
Great work, Dan
Flat slabs are so last century. Winnipeg may be flat slab country but Prof. Mark West is employed by the University of Manitoba so there is some innovation happening there.
The disc cappings between the organic shaped canopy would actually be more visually acceptable to me if they were spheres rather than discs which would take up the stress and compression factors in the material perhaps in a better way and visually more pleasing on the eye? - Just a thought ;)
These are astounding!
thank you so much for this lecture and I thank you for sharing such precious know how which that are really very valuable for our knowledge.Sincerely Ben
I cannot understand how the sheet and the catenary arch can possibly be any different. Crazy the way other so called experts won't comment
"Chalk-Aided Design" - love it!
No computers for CAD? Chalk Aided Design? LMAO. Love it. I've worked supporting computers for decades and for my home projects I still draw it out and make cardboard mini-models.
I'm obviously not anti-computer design but it is funny to see others viewing things the same way I do.
Fascinating !
Impressive!
super cool!!
I've shared this with my artist friends - It would be great to get a follow-up on any progress!
You should contact Mark West directly, see link in the description of the video.
Thanks good work
The answer is gravitationally Yes !. Luckily my stressed member doesn't droop. ;)
the possibilities endless
awesome
Wouldn't be great to form the bridge with a reverse cloth form in place and a single cable axial pivot which is strung from bank to bank. The bridge could be poured, hardened then rotated around the cable axial pivot in place to form the entire bridge.
Google image search Gaudi String models and look around 82 Canyon View, Ransom Canyon on Maps. Lawson di Ransom Canyon Peace o' funicular one.
Is there any chance you could provide the name or brand of this particular geotextile that is used in your process?
why not use a strong plastic and heat shrink it flat instead of letting the folds define the workspace?
Some heavy engineer-shade up in here.. ;)
Check out the Fabric Formwork group on Facebook, or the website of ISOFF, the International Society of Fabric Forming
look at my site to see my kiln.you tried choped steel strands yet?
all fabrics and ropes and chains hang in a parabolic arch, cross ribbing will also be parabolic and it is the best structural shape to deal with stress. By turning gravity upside down I believe it is giving you the exact inverse of the force applied to your material to resist it being turned right side up. Barring trusses and bracing I think many structural problems could be resolved by draping the ceiling over the vertical supports and turning the whole model upside down. Ridged fabric may not work as well as a stretchy fabric.
All ropes and chains hang in a catenary arch, not parabolic. Turning fabric upside down is a great idea, applied heavily by Heinz Isler in practice. A somewhat rigid fabric might work to an advantage, as Mark West suggests around the 19:30 mark, because the folds offer the inverted shape additional buckling rigidity. A purely hanging form that is inverted might be good for static stresses, but may be very sensitive to buckling and imperfections if it's also very thin.
I had to look it up. Wikipedia agrees with you about hanging chains, but when they showed examples of each they were indistinguishable from each other. They sited that the parabola is derived from one specific quadratic formula and the catenary from a hyperbolic formula. I am a carpenter, there are mechanical means of making arches and circle segments and some even by using string and nails so when the product is formed it is difficult to tell what trig formula best describes it. It appears that the parabolic has a wider foot stance. I designed and built a wooden oval drawing tool, something from a distant memory perhaps, where two pieces of wood slide in right angle chanels , just missing each other by means of a connecting rod, the extended rod will forever make variable ovals but never a circle. I always assumed that half of the oval is a parabola, but the base would be parallel and no longer the perfect arch for supporting weight, am I wrong?
O0 like these.
An oval is also different. Depending on the proportions of width-to-height or span-to-rise, all three shapes can be very similar or visibly distinct. Both the oval (or ellipse) and the parabola are conic sections. The Wikipedia page on the 'Conic section' has some nice visuals on how they relate.
Thanks, I may need to know more about this when building my 13th century castle, though it won't have many arches but knowing which best support stone weight would be good. Typically I bend an extra long flat metal bar, far past my cutting points to get good arches, and I believe they would be described as parabolic and not catenary.
FANTASTIC HalleluYah I want to build a cool Gazebo with a wood stove inside it..:D with this cloth cement idea..Perhaps using a standing A frame for a way to use for laying the cloth for it to be saturated with cement and water perhaps another hardening mix like a plasticizer for a more durable textile strength..Just saying..
... And 5 years later? Can we see a result, please.
The Nau Gaudi search google images....you will like rediscover it.
Now do these forms with scaffold poles and you might really have something.
does this fella live in a dark cave?