D-Nets: equilibrium gridshells symmetric to the principal stress directions скачать в хорошем качестве

D-Nets: equilibrium gridshells symmetric to the principal stress directions

Parallel Session 53, Optimisation methods for analysis and design of roof structures (WG 13) Eike Schling, Jonas Schikore and Thomas Oberbichler (University of Hong Kong & Technical University of Munich) present their work on topology for gridshells. This video presents a novel topology for gridshells symmetric to the principal stress directions. This quadrilateral, diagonal layout (D-Net) distributes forces evenly across neighbouring members. Its orthotropic behaviour creates equilibrium states for compression- (or tension-) only gridshells. We derive a formula for the D-Net directions, we use isogeometric analysis (IGA) to continuously evaluate their stress field on NURBS surfaces, and we present a computational workflow to calculate their paths under given loads and supports. In this initial investigation, we focus on rotational surfaces for compression-only and mixed (compression and tension) gridshells. The results are verified by a series of archetypical design shapes and an FE-analysis. We compare the structural behaviour of three gridshells, equilateral, principal-stress and D-Net and discuss the practical challenges for D-Net design and its potential for architecture. The research provides a holistic assessment of this new theory, design and structure that naturally follows the flow of forces. Watch their presentation on "D-Nets: equilibrium gridshells symmetric to the principal stress directions" from the Spatial Structures 2020/21 Conference. #IASS #IASS2020_21 #SpatialStructures #Architecture #Structures #Engineering #LightweightStructures #CivilEngineering #StructuralEngineering #Conference #Construction #computationaldesign #nextgeneration #parallelsessions #optimisation #methods #analysis #design #roof #roofstructures #workinggroup #gridshells #topology #theory