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Form finding and structural analysis of actively bent timber grid shells
Highlights We defined a numerical framework to aid the design of actively bent grid shells. The 6 DoF Dynamic Relaxation formulation allows for bending and torsional stiffness. A novel single-node numerical model for cylindrical joints is introduced. The methods accuracy is demonstrated by comparisons with analytical solutions. Framework reliability and functioning are provided by practical application examples.
Abstract Grid shells are efficient structural systems covering large open spaces with relatively small amount of materials. Also, post forming techniques allow realization of geometrically complex (free-form) shapes by means of standard connection systems. However, due to complexity of the analysis–design process, they are rarely utilized in construction design. In this paper, a ‘facilitating’ numerical framework is introduced in which, for a given continuous reference shape, a geometrically similar discrete model is found by implementation of a six degree of freedom formulation of the Dynamic Relaxation method, to handle members bending and torsional stiffness. A grid cutting pattern algorithm is introduced, as well as methods to numerically simulate the double-layer construction technique and a novel (single-node) cylindrical joint model. The methods are extensively tested and validated on a range of structures, from ‘simple’ single-rod cases to more complex, actively bent, grid shell frameworks.
Form finding and structural analysis of actively bent timber grid shells
Highlights We defined a numerical framework to aid the design of actively bent grid shells. The 6 DoF Dynamic Relaxation formulation allows for bending and torsional stiffness. A novel single-node numerical model for cylindrical joints is introduced. The methods accuracy is demonstrated by comparisons with analytical solutions. Framework reliability and functioning are provided by practical application examples.
Abstract Grid shells are efficient structural systems covering large open spaces with relatively small amount of materials. Also, post forming techniques allow realization of geometrically complex (free-form) shapes by means of standard connection systems. However, due to complexity of the analysis–design process, they are rarely utilized in construction design. In this paper, a ‘facilitating’ numerical framework is introduced in which, for a given continuous reference shape, a geometrically similar discrete model is found by implementation of a six degree of freedom formulation of the Dynamic Relaxation method, to handle members bending and torsional stiffness. A grid cutting pattern algorithm is introduced, as well as methods to numerically simulate the double-layer construction technique and a novel (single-node) cylindrical joint model. The methods are extensively tested and validated on a range of structures, from ‘simple’ single-rod cases to more complex, actively bent, grid shell frameworks.
Form finding and structural analysis of actively bent timber grid shells
D’Amico, B. (author) / Kermani, A. (author) / Zhang, H. (author)
Engineering Structures ; 81 ; 195-207
2014-09-16
13 pages
Article (Journal)
Electronic Resource
English
Form finding and structural analysis of actively bent timber grid shells
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