Introducing a regular pattern of slits turns inextensible, but flexible sheet material into an auxetic material that can locally expand in an approximately uniform way. This modified deformation behavior allows the material to assume complex double-curved shapes. The shoe model has been fabricated from a single piece of metallic material using a new interactive rationalization method based on conformal geometry and global, non-linear optimization. Thanks to our global approach, the 2D layout of the material can be computed such that no discontinuities occur at the seam. The center zoom shows the region of the seam, where one row of triangles is doubled to allow for easy gluing along the boundaries. The base is 3D printed.

This article presents a new lightweight construction system for doubly curved shells made from timber plates, inspired by the masonry vaults of Eladio Dieste. The system was developed for a specific case-study project, and general applications to other freeform surfaces are being discussed. The shells are built from two interconnected layers of structural wood veneer plates, using integral through-tenon joints for a fast, precise, and simple assembly. This allows for the construction of a series of differently shaped vaults without a costly mold or support structure. Instead, inclined joints cut with a 5-axis computer numerical controlled milling machine embed the correct location and angle between plates into the shape of the parts. This constrains the relative motions between joined parts to one assembly path. To take advantage of the benefits of such connectors, the constrained assembly paths must be considered in the fundamental design of the system, allowing for the insertion of each plate. This imposes additional constraints in the segmentation process of doubly curved shells. In order to meet the requirements and resolve the multi-constraint system, we use a global, nonlinear optimization approach. Developed as a close collaboration between architects, computer scientists and structural engineers, this article includes an experimental analysis of the influence of parametric modifications in the shape of connectors on their load-bearing performance.

http://vdf.ch/advances-in-architectural-geometry-2016.html on the relationship between architecture and technology. Werner Sobek, whose practice operates at the interface between architecture and engineering, contributes with his expertise in lightweight constructions and his interest in performative structures. Complementary to these highly recognised professionals, Erik Demaine and Urs B. Roth contribute distinct perspectives on geometry. While they share a deep mathematical understanding and a passion for surprising "geometric discoveries" , their work methods are diametrically opposed. Erik Demaine develops his origami sculptures by engaging with computational algorithmic techniques, whereas Urs. B. Roth's heuristic search for form developed using sequences of accurate drawings and rigorous formulas that create their own peculiar aesthetic. Interesting enough, though, both consider themselves to be artists in addition to being scientists.The peer-review process for the selection of papers was managed by the scientific co-chairs, covering the domains of architecture, structural engineering, mathematics, and computer science, with the support of the scientific committee and the AAG2106 coordinator. From a very large pool of submissions, 22 papers have been accepted and included in the present proceedings. In addition, 25 posters have also been accepted for presentation, and the workshop chair has selected 12 workshop proposals for the pre-conference sessions. We extend our thanks and acknowledgements to all authors, tutors, reviewers, and organisers for their invaluable contributions to this process.External industry partners are vital to both the integrity and the execution of such a large conference. We are very pleased to have strong and highly supportive partners and industry sponsors for the AAG2016. We would like to especially thank our main sponsor ABB, our workshops sponsor Autodesk, and the conference sponsors Moog, Waagner Biro, ERNE, Evolute, Absolute Joint System, and Disney Research for their backing and guidance.Finally, we would also like to thank our colleagues and co-hosts at the Institute for Technology in Architecture (ITA), the Department of Architecture, and the ETH Zurich for their ongoing support and for providing the conference venues. We hope that you enjoy your time visiting ETH and Zurich, and wish you an excellent conference.

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