Optimal vault problem – form finding through 2D convex program

Abstract

This work puts forward a form finding problem of designing a least-volume vault that is a surface structure spanning over a plane region, which via pure compression transfers a vertically tracking load to the supporting boundary. Through a duality scheme, developed recently for the design of pre-stressed membranes, the optimal vault problem is reduced to a pair of mutually dual convex problems formulated on the 2D reference region. The vault constructed upon solutions of those problems is both of minimum volume and minimum compliance; analytical examples of optimal vaults are given. Through a measure-theoretic approach, such optimal vaults are proved to solve the Prager problem of designing a 3D structure that by compression carries a transmissible load. The ground structure method applied to the convex problems furnishes a pair of discrete, conic quadratic programs leading to optimal design of grid-shells. By adopting the member-adding adaptive technique, this pair is efficiently tackled numerically. The computer method is demonstrated on a number of examples where highly precise grid-shell approximations of optimal vaults are found.