Grasshopper

algorithmic modeling for Rhino


This post describes the work of Ramboll Computational Design during the design and construction of the Ongreening Pavilion timber gridshell. The detailed design was a collaborative effort between Ongreening Ltd. and RCD.



The structural approach involved form-finding bending-active timber laths in Kangaroo, connected at intersections to form a doubly curved shell. The final lath positions follow geodesic lines, making them simple to fabricate and assemble. Each lath was CNC cut from 6.5mm thick Finnish birch plywood laths that could achieve high curvature while maintaining desired strength.



Due to the random nature of the final lath topology, the resulting structure was extremely stiff in spite of its low material weight, acting similarly to a continuous monocoque. The Shell model was built in Grasshopper and continually analysed in Karamba, with this feedback informing the seeding of the secondary geodesics elements to increase the performance of the shell and make it suitable for public use. The fully demountable shell was first erected at Ecobuild 2014 in London.


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Comment by Shawna Waters on December 9, 2019 at 7:13am

it’s just amazing design and I love this very much and would like to follow in my work as well. Visit TypeMyEssays.com for more help in essays. I am also a designer that’ why, its very good for me to get this article to know how can we design such kind of things easily.

Comment by djordje on June 2, 2014 at 5:20am

You definitively did. Thank you for the informative replies.

Comment by Will Pearson on June 2, 2014 at 5:16am

Absolutely. The time spent arranging the laths in this way allowed us to gain a much deeper understanding of the behaviour of the structure and also the sensitivity of the secondary lath placement. The goal was not to optimise the structural behaviour but simply to create something lightweight, easy to construct, robust and visually striking; I think we achieved this!

Comment by djordje on May 30, 2014 at 10:52am

Ok Will. So basically you edited the positions of  secondary laths, without the use of Genetic Algorithms (Galapagos or Octopus)?

Comment by Will Pearson on May 30, 2014 at 10:37am

The primary (radial) laths were "adjusted" post-form-finding to follow geodesics. The secondary (random) laths were seeded by eye, using real-time feedback from the Karamba model. The criteria for the secondary lath arrangement become somewhat complicated when you try to think about them in terms of objective functions (lateral stability, robustness, getting the structure working as a continuous shell and, of course, aesthetics). For a structure of this scale (relatively small) it was far easier to simply use design intuition, which is sometimes underrated!

Comment by David Stasiuk on May 30, 2014 at 6:44am

Love it...it looks if not exactly symmetrical very close...is that right?

Comment by Edgar Hech on May 29, 2014 at 2:42pm

very nice work

Comment by djordje on May 29, 2014 at 6:31am

Very nice!
The secondary laths were not created in Kangaroo, but generated with the use of Karamba (by using Galapagos to achieve minimum deflections)?

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