TY - JOUR

T1 - Structural behaviour of asymptotic geodesic hybrid timber gridshells

AU - Wan, Zongshuai

AU - D'Acunto, Pierluigi

AU - Schling, Eike

N1 - Funding Information: The research has been supported by the University Grants Committee (UGC) of Hong Kong, Early Career Scheme (RGC Ref No. 27604721), the Special Projects Fund at HKU DoA, the Professorship of Structural Design, TUM, as well as our industry partners Holzbau Amann and Metallbau Erhard Brandl. The geometry optimization of the structure was generated by Hui Wang and Helmut Pottmann at KAUST, Saudi Arabia.

PY - 2024/4/5

Y1 - 2024/4/5

N2 - Asymptotic geodesic gridshells are a novel structural system that is fabricated from straight and flat planks. The planks are elastically bent and twisted around their slender dimension to achieve the desired geometry, while the tall dimension creates structural stiffness. This system combines the geometric features of asymptotic and geodesic curves to create a hybrid tri-hex network on doubly curved surfaces, and provides a stable grid to resist its self-weight and external loads. To comprehensively explore the structural capabilities of asymptotic geodesic gridshells, a full-scale timber gridshell prototype was designed and built. Loading tests, including local and one shell asymmetrical loading, were carried out to examine the structural behaviour of the gridshell. A nonlinear finite-element model was developed and subsequently validated using experimental data. The evaluation of the timber gridshell revealed its high performance under uniformly distributed loads, and the simulation indicated a viable live load capacity of 7.0 kN/m². In a parametric study, the influence of the polar array layout, the joint rotation stiffness, and the support condition on the structural performance of the hybrid gridshell are analysed. Parameters influencing the achievable span are discussed regarding strength, stiffness and buckling behaviour for future design considerations.

AB - Asymptotic geodesic gridshells are a novel structural system that is fabricated from straight and flat planks. The planks are elastically bent and twisted around their slender dimension to achieve the desired geometry, while the tall dimension creates structural stiffness. This system combines the geometric features of asymptotic and geodesic curves to create a hybrid tri-hex network on doubly curved surfaces, and provides a stable grid to resist its self-weight and external loads. To comprehensively explore the structural capabilities of asymptotic geodesic gridshells, a full-scale timber gridshell prototype was designed and built. Loading tests, including local and one shell asymmetrical loading, were carried out to examine the structural behaviour of the gridshell. A nonlinear finite-element model was developed and subsequently validated using experimental data. The evaluation of the timber gridshell revealed its high performance under uniformly distributed loads, and the simulation indicated a viable live load capacity of 7.0 kN/m². In a parametric study, the influence of the polar array layout, the joint rotation stiffness, and the support condition on the structural performance of the hybrid gridshell are analysed. Parameters influencing the achievable span are discussed regarding strength, stiffness and buckling behaviour for future design considerations.

KW - Asymptotic curves

KW - Asymptotic geodesic hybrid gridshells

KW - Construction-aware design

KW - Elastic gridshells

KW - Experimental testing

KW - Geodesic curves

KW - Numerical simulation

KW - Timber structures

UR - http://www.scopus.com/inward/record.url?scp=85189759664&partnerID=8YFLogxK

U2 - 10.1016/j.engstruct.2024.117918

DO - 10.1016/j.engstruct.2024.117918

M3 - Article

AN - SCOPUS:85189759664

VL - 308

JO - Engineering structures

JF - Engineering structures

SN - 0141-0296

M1 - 117918

ER -