TS Diploma Lecture

Tuesday OCT 11 2011

Team HYBIOS of Emtech lecturing Technical Studies Diploma 4 class with Christina Doumpioti on the effect of force on matter, when used in form finding methods.

HYBIOS Team to Lecture to TS4 Diploma Class: FORM+MATTER

We look forward to lecturing as part of an introduction series for Christina Doumpioti's Diploma Technical Studies 4 at the AA. For more information check out the course's blog mAAterials at:

http://maaterials.wordpress.com/2011/10/08/hybrid-biostructures/

HYBIOS 4.0/ Modeling Construction Logistics

After working with the shell prototypes using building scale materials, the construction logistics started  to become clearer. It became apparent that we needed to push the material upwards and tension it down, instead of using the cubic frame we used before. 

We devised a construction system, similar to Mechano toys, where the components of the system could be adjusted for height and angle to create differentiated variable spaces.

The result of the interior finish turned out a bit rough, but the system works so far. The fabric sagged while drying, due to some faults in the design of the system. It was also hard to finish and cut some elements inside. We plan on fixing those problems while working out the next prototype.

AA School of Architecture Visiting School Paris 2011

Self-assembled Prêt-à-Porter will develop a new kind of skin operating as a responsive system to the contemporary needs of the human body, society and technology.

Confronting the currently existing ‘capitalism comfort zones’ in fashion industry (mass- distribution primarily) this studio seeks to engage self-assembled protocols as dynamic landscapes to generate architectonic surfaces.

Aided by handcrafted and software-generated physical modelling, the unit will experiment with form finding methods and prototyping in order to achieve a design proposal.

During week 1 the workshop will commence by researching the possibility of integrating natural systems within contemporary design disciplines, fashion and architecture. Participants will examine biological systems found in nature, from sea flora and fauna, like sponges, to all common-structure vertebrates and reptiles. The aim of the initial research is to draw inspiration to mimic the local intelligence and structural systems of these creatures. 

During week 2 participants will be introduced to methods of creating feedback loops between their physical experiments and digital tools. Computation is used as means to facilitate multi-scalar design: from landscaped bodies and tectonics to experimental fashion design.

Fashion is a unique creative platform that must undergo onto mutation. Self-assembled Prêt-à-Porter Unit seeks to raise awareness within architectural education to avoid processes of ‘pop’aestheticisation and thereby, preventing the risk of anaesthetisation of our society.

HYBIOS 3.1/ Multi-Level Spatial Differentiation

With this HYBIOS, we tried introducing multiple heights by adding a new floor plate. The mesh was stretched from the top layer to the next one and from the mid layer to the lower one to support it upwards. Spatial differentiation of multiple levels starts to emerge, and scale relations of elements appears clearer. 

Slab Deflection Test/ Reinforcment Comparison

A deflection test was carried out for 6 different slabs with different reinforcement materials, to compare the structural integrity of different wall assembly options. Slab 00 started with no reinforcement, Slab 1.1 + 1.2 were reinforced with a concrete cloth and a metal mesh respectively. Slab 2.1 + 2.2 were reinforced with metal meshes of different porosities.

 Slab 3.0 was reinforced with BarChip fibre and a hexagonal mesh. The results clearly show that BarChip is an excellent material choice for the re-inforcement of shotcrete for the use on the freeform mesh. The BarChip  fibre reinforced slab broke at a weight of 247, which is amazingly stronger than any other reinforcement option we have tested.

Thank you to Elasto Plastic BarChip for sending in samples for us to test: http://www.elastoplastic.com/

Mesh Stretch/ Forming Experiment

We tested our method of forming on a different material system. This time using a thin, formable aluminum mesh.

The mesh was stretched on Lycra fabric and reinforced with strips of a stronger hexagonal mesh. The mesh combination was plastered with concrete using a trowel and smoothned with a layer of grout brushed into the surface.  

The forming process was successful, we achieved a satisfactory displacement measurement of about 400 mm on a small 1000x1000 mm piece. 

Concrete Testing/

We casted concrete slabs with different mix levels and reinforcement material. The slabs were weighed and tested for compressive loads. The intension is to compare CC concrete cloth to mesh reinforcement as potential materials for forming. 

More CC Testing/ Manipulating Form

We carried on more experiments with Concrete Cloth (CC). This time, we followed some of the logic of our form finding methods we used on the Hybios prototypes.

Some emergent properties of the materials informed the forming process. This time, a point was pushed from underneath rather than pulled. cuts were planned out strategically and pulled to create a symmetrical dome shape.

We also tried restraining points on a grid. The results were surprisingly satisfactory. The CC used this time was 8mm thick though.  We used the cuts to form orb like cells restrained by the frame we used for one of our very first experiments with plaster.

Fabric / Concrete Cloth Testing

The past two weeks we decided to get our hands dirty, and take a stab at material testing. 

We tested the fabric that we have been using to create the HYBIOS and several other fabrics, such as cotton and scrim. We used a meter to measure the weight devised from pulling, as well as the displacement threshold before the material would break. The materials were tested on a 1000x1000x1000 mm frame.

Concrete cloth was tested at 4 mm thickness. The maximum displacement was about 400 mm, after which the concrete cloth would break.

A curvature analysis and a displacement calculation were produced. We modeled the resultant form that was the result of pulling the Concrete Cloth at the center. The displacement calculation would help us in setting limits for the next analogue and digital experiments. ANSYS was used to create the displacement chart of an 8 mm  concrete shell with steel mesh reinforcement. 

The Material was hydrated and left to set completely for about 24 hours. 

Many problems were encountered, but the material successfully deformed using the pulling and tensioning method. We noticed that pushing the material up with a stick produced lesser deformed curvatures. Creases and ripping should be avoided.

AA/CCA Biodynamic Structures July 2011

Biodynamic Structures _ July 2011
San Francisco Visiting School
California College of the Arts
Monday 11 to Friday 22 July, 2011
_______________________________________________________________________________________________________________

HYBrid BIOStructures was presented at a workshop by Emtech at California College of the Arts.


"This ten-day intensive workshop, co-taught by the faculty of the Emergent Technologies and Design Programme at the AA and the faculty of Architecture and MEDIAlab at California College of the Arts, will explore active systems in nature, investigating biomimetic principles in order to analyze  design and fabricate prototypes that respond to electronic and environmental stimuli."

Cesar Martinez sent us these photos:

AA Emtech Tutors Christina Doumpioti & Evan Greenberg present HYBrid BIOStructures as part of their 'Material Tectonics' Section of the introduction Lectures.

Visit the official website: http://sanfrancisco.aaschool.ac.uk/

AnaHYBIOS 3.0_ Lab Photos

Fabrication Materials Proposal

We looked at several materials used in combination to create a wall system. The first layer is mainly used for creating the geometry, using the same method of pulling and tensioning. The material is then hardened to shape and would act as reinforcement in the wall. Layers of materials could be added to achieve different performative qualities within the wall. 

Shotcrete reinforced with Barchip fibres would be used on the surface of the added materials. Barchip reinforced concrete has good compressive and tensile qualities. We plan on testing several materials for the next steps to get closer to a combination of materials that we can use to test at a 1:1 prototype.

DigiHYBIOS 1.0 & AnaHYBIOS 3.0 / New Approach: From Digital FormFinding to Analogue Methods

With the latest HYBIOS, we adopted a new approach. This time the experiment was based on a digital FormFinding algorithm using Daniel Piker's Kangaroo Plugin for Grasshopper. The new experiment also resolved some of the issues of the previous experiment. 

A cellular grid was used to generate a frame for pathways to have a more even floor to walk on. This time, the modeling was done to scale. Points were restricted at the pathway edges to create ramps on the raised platform. The mesh was relaxed within the grid cells to create blob-like forms by restricting the outlines of the grid. The roof membrane was stretched towards the center of the cells. The idea is to create a circulation path within the space, where depressions within the grid cells could be used for seating etc. Although more control was gained over the digital FormFinding process, there were a lot of restrictions with using the algorithm. Material behaviour and mesh qualities could not be embedded within the logic of the algorithm. Deforming the mesh was not done in real time either, which was a major restriction. We would like to create a script eventually that solves the problems of the current tools we are using and calculates the forces as output.

We deployed the same logic with the analogue prototype. The results were approximately similar, although we have more control over the shaping process, which enabled us to generate more interesting archi-tectonics. The idea of the developed formwork is that the floor grid could be reused to cast several other HYBIOS. The model was constructed to a scale of 1:50 for a 20m x 20m space. Essentially the point of this experiment is to control the reusable formwork to form the structures.

New Approach: From Digital FormFinding to Analogue Methods

We looked at the paper entitled 'Linking Hanging Chain Models to Fabrication' by Axel Kilian as a source of information and inspiration to carry out our next experiment. The next experiment mainly had to focus on utilizing digital form finding methods to add to our methods for producing the next prototype. 

Axel Kilian, Ph.D. Candidate in Computation, Department of Architecture, School of Architecture and Planning, Massachusetts Institute of Technology, Cambridge, MA.

SUMMARY OF PAPER

Fabrication output is an integral part of the iterative process and not a post design process.

The relationship between form finding model and the translation into volumetric form was explored in a series of small models.

His Motivation :

Equilibrium solutions can be scaled if the proportional distribution of mass is kept and the geometry of the lines of forces is scaled proportionally. This holds true even though mass does not scale proportionally to geometric dimensions.

A major disadvantage is that a physical model is hard to measure accurately and

in reasonable time, as measuring requires physically accessing the model. The

measurement of forces within the strings of the model is even more difficult, as it

requires the installation of strain gauges, which is time consuming and can potentially

disturb the model. In addition, the measurements are not part of the design process. The

design is frozen to allow for iterating through the load measurements throughout the

model in one given state

The digital version, in contrast, allows simultaneous measurement and creating/editing of

geometry. These measurements can directly drive other dimensions in the model. In the

digital model, editing and creating the string weight is less limited by the availability and

preparation of the physical material, which in the case of a very complex model can

substantially slow down the process. Furthermore, the use of generative techniques

allows for the rapid placement of complex string constructs and observing their behavior

before investing time into an elaborate physical model

The self-weight of the load-bearing member contributes only negligible

amounts to the structure locally and therefore does not substantially affect the hanging

curve form. If there is no load present other than the weight of the structure itself, the

self-weight becomes the dominant form giving factor. The cross section has to provide

enough area for the forces traveling through it. A further optimization of the structure, for

example with the aim of achieving uniform compressional loading throughout the same

material, which would be possible by varying thickness, was not undertaken by Gaudi.

Islers Conclusion : page 8

Isler identifies instabilities in his shells as follows: First, at the

supports second, due to general buckling; third, due to local buckling of the free edge (for

which the counter curvature is so important)

Designing in dynamics vs. analytical approach. Design by discovery : Page 10

Structural and dimensional evaluation of form is not an afterthought but an essential of

the design process. This is where the learning by discovery enabled by interactive tools comes into play. In interaction with a live, force-geometry linked structure, a designer can directly observe the range of structural responses while exploring possible forms. This encourages an explorative approach to design and supports unconventional solutions that integrate and respond to the designer’s intent.

NEXT STEPS>>>>>>>

1. form finding,

2. topology finding,

3. load path finding,

4. material distribution

5. testing for structural redundancy

6. optimization.

Form finding techniques in an interactive digital modeling environment can support the

design process by giving continuous feedback to the designer, allowing the designer to

integrate structural principles into the creation of form rather than to structurally optimize

the finished form at the end of the design process.