Research progress

Arjan Klem1211366

Concept &hypothesis

How to create a structural concrete facade that is transparent enough to get a good amount of daylight in and is not made of standardized elements?

The growth of a bone structure is nature’s example of a structure reacting to forces applied to it.

Topology optimization; Optimize a shape to the forces applied to it, using the minimum amount of material.

A free 2d example program was used to experiment a little with this.

www.topopt.dtu.dk

Things I had to do:- Calculate the forces on a standard building- Find a optimization program to calculate the façade of this building

The building:20x20x12 metersWind load: 1kN/m²Chosen façade thickness:

300mm

- This resulted in the input for a program

As the optimization program I use Diana with a optimization script I received from dr. ir. Max Hendriks, who has done some research about optimization in Diana.

Now I had to model the input.

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Model: STRAMIENDeformation = .113E-1LC1: Load case 1Step: 1310 LOAD: 1Gauss EL.ITEMS ITEM01Max = 1Min = .781E-2Results shown:Mapped to nodes

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21 MAY 2007 18:13:12 item01case2iDIANA 9.2-06 : TU Delft Max Hendriks

Optimization in Diana, Max hendriks, May 2007

Some factors are affecting the results:- Mesh Type (triangular/Quadratic)- Mesh division (finer=accurate but

slow)- Number of iterations;

Every node can be reduced 7 times so the maximum number of iterations is 7*nodes. Sow a finer mesh causes exponentionally more calculating time.

Results of a triangular 24x24 mesh using 50000 iterations

Now it raises the question if the Diana calculations are correct:I should somehow create a real model and test it and compare the results with the Diana output.

-Downside of using Diana:Calculation times become very long to get accurate results