Lattice Shell Methodologies: Material Values, Digital Parameters

Abstract

Lattice shells combine an elegance of form with the efficiency of structure driven by the material constraints of straight lath members that can be bent into shape. While formally expressive, the form is the result of an explicit methodology combining form-finding, material constraints, and construction logistics. As the boundary curve establishes the constraints of the system, it is the boundary curve, not the surface, which gives the designer discretion over form. From this boundary constraint, the form is developed through the forces applied in the form-finding process such as a vertical load vector (pushing) and/or surface relaxation (stretching or equalizing). Although these values can be adjusted by the designer, they are only meaningful when calibrated by material constraints. Through physical testing real-time material feedback can be embedded into the parametric system. In combination with form-finding, the use of geodesics constrains fits lath members to the compound curved shell such that it can be constructed from straight lath members. As an elegant response to how material can inform form, by integrating these processes into a parametric workflow, further attention can be applied to other design criteria including spatial development and environmental response while maintaining the elegance and structural economy of shell structures.