Complex bending-active structures from continuous flexible planar sheets or a hybrid structure introducing the use of spacer fabrics

Abstract

ABSTRACT This work aims to provide an approach to the development of a new structural system, representing a new typology of bending-active hybrids, working with planar elements. This system can be applied as temporary or semi-permanent structures. It takes advantage of utilizing parametric design and prefabrication in order to optimize its structural and sustainable characteristics. СBA-CFS (complex bending-active continuous flexible sheet) structures are made with flexible materials and based on the interaction of bent and tensioned elements in balance, complementing one another. The main element of the structure is a bending-active surface, bent bidirectionally in a complex buckled geometry to realize double curvature. The orientation and size of the buckles take into consideration the specific rules of the form-finding and its stress distribution. The innovation behind the proposal lays in a new comprehension of the concept of a bending-active surface, avoiding tessellation or cuts. The bent shape is kept static through a set of membranes working in tension. The proposed pavilion project is made-up of a unique knitted architectural material, inspired by spacer fabrics. This specific material proposal strongly supports the concept of uniform non-tessellated bending-active sheet, adapted to a wide range of forms with a single homogeneous piece. A sample of the material is produced manually at a 1:1 scale and a model of pavilion at 1:5 scale. The work is supported by physical and digital models, using the finite element method of analysis and particle spring system for simulation and form-finding.