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Rapid optimisation of free-form geometry for cold-formed glass Franklin Lancaster Innovation Panel

Facades+ 25 October 2013, Chicago eckersley o’callaghan & partners, LLC


Integrated design team • Ever specialised disciplines • Fragmented design team • Need for Integrated tools • Rapid feedback • Overarching control

eckersley o’callaghan & partners, LLC


Outline •  Initial geometry • Direct import from common modelling tools (NURBS)

•  Analysis/Optimisation • Establish glass stresses • Relax areas of high κ (stress) • Define structurally optimised surface based on original

• Output • Mathematical surface • Input to further plugins eckersley o’callaghan & partners, LLC


Evaluating reference surface • Evaluate stress limits of glass (governing factor) • Analyse principal κ • Kirchoff (thin) plate theory • Infer glass stresses

eckersley o’callaghan & partners, LLC


Optimisation of target surface • Impose stress limits from initial analysis (BC’s) • Iterative solver to arrive at target glass stress • Form-finding based on particle spring model • Redefine geometry based on target stress analysis

eckersley o’callaghan & partners, LLC


Summary • Powerful scripting and plugin architecture (Rhino) • Direct import of geometry • Initial analysis, optimisation and output from single environment • Useful Output: same format as input • Addition of further plugins (Diva, Evolute . . .) eckersley o’callaghan & partners, LLC


Thanks • References • Marinov, V., Lenk, P. ‘Optimising quadrilateral free-form grids for panelisation with cold-bent glass’, Presented at GPD Finland June, 2013

eckersley o’callaghan & partners, LLC


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Facades: Chi 2013 - Franklin Lancaster