Design Development/ Analysis of Emergent Form

A series of digital models were generated to be tested for quantities to be used as input parameters. The condition of the interior space in terms of lighting and thermal comfort was of primal concern during this phase of the design. These conditions can be controlled in the interior through the generated skin.

Interior formal elements were chosen from the AnaHYBIOS models to be introduced as final geometry generators. The final geometry in this case being composed of spatial instances where the instance is shaped by the effect of force on matter to produce an environmentally controlled space. A space that is affected by the exterior weather conditions in a specific location.  Methods of organizing these elements and clustering them were revised.

Limitations of the material system were considered while the conditions are set for the mesh relaxation algorithm to produce desirable spatial outcomes. Different programmatic scenarios were sketched to anticipate the pragmatic function of the generated spaces. Perceptual thresholds were created by introducing the spatial elements at specific instances.

One major limitation of the HYBIOS system is the amount of vertical distance needed to achieve a habitable floor area. That extra height clearance however, has the  capability  of creating a stack effect for natural ventilation within the building. The geometry of the solar chimneys have to be tested and oriented according to surrounding weather conditions.

Iterations of the initial algorithm were generated to be tested. The first two spaces were generated based on a hypothetical program, that has similar areas to a patch of the overall proposed program.

The morphology of the exterior skin was tested for straight and inclined solar chimneys, it became clear that the chimneys have to be oriented towards the wind source and away from the sun to reduce the stagnation of wind on the exterior and improve the stack effect inside the building.

The third and fourth prototypes were tested for their interior spatial condition, starting by shifting the ground planes of each program to create more differentiation between the parts.

Plate stress tests were carried out on the form using strand7 to determine the thickness of the concrete shell.

The emergent interior space became a well-lit, well ventilated space and the qualities of the previous physical models started to show in the interior of the digital models.

DigiHYBIOS Mesh Relaxation

BETTER RESOLUTION: http://vimeo.com/33411827
A numerically calculated mesh was used to simulate a 'hypothetical space'. The script calculates the roof enclosure according to the HYBIOS material system and stops when the minimum span has been reached (red square).  Spatial and lighting needs are taken as driving parameters dictated by the program. Faces of the mesh are culled according to area (blue) (curvature of enclosure to create the light pixelation effect to create different lighting experiences. Currently our efforts are geared towards forming the spaces according to per formative criteria, such as channelling wind speed and pressure, and ventilation.

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.

C.A.S.T Team of the University of Manitoba

An interesting article featured in the AD Magazine 'Protoarchitecture' by the cast team at the University of Manitoba. Mark West talks about creating architectural protoypes using innovative analogue methods and materials. The article focuses on the feedback loop between the analogue and the digital when investigating these prototypes.