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On the Geometry Effect on Double-Curvature Cable Domes
Cable domes are lightweight flexible structures and highly sensitive to geometry change. Different forms of cable domes have been developed over the past decades. As one of the newly developed forms, double-curvature cable domes have been proven to have more stability than the corresponding positive ones and better rigidity than similar double-curvature cable nets. One critical factor to be considered when designing double-curvature cable domes is the effect of changing geometry on the optimized weight and displacement of such structures. Several geometrical parameters may affect the size and prestress optimization of these forms, in terms of structural weight and stiffness, such as number of hoops and sectors, height/diameter, rise/sag, and inner hoop diameter. This paper investigates the effect of such parameters on the optimized weight and prestress level of this new form at several maximum displacements. The optimization technique adopted in the current study depends on prestressing the dome with an initial value of prestress level that ensures starting from a feasible state, i.e., with no slack in cables. Then, the prestress level is increased incrementally until reaching a maximum displacement of less than span/1000. At each increment, the dome is optimized to the minimum weight. The optimized values at each increment are fitted to power curves that relate both the optimized weight and prestress level to the maximum displacement. These fitted design curves are developed for a dataset of the geometrical parameters stated above and compared based on two criteria; the first is the optimized weight at maximum displacement equal to span/250 as recommended by design codes, while the second is the effect of increasing the dome stiffness on the optimized weight when decreasing the maximum displacement from span/250 to span/1000.
On the Geometry Effect on Double-Curvature Cable Domes
Cable domes are lightweight flexible structures and highly sensitive to geometry change. Different forms of cable domes have been developed over the past decades. As one of the newly developed forms, double-curvature cable domes have been proven to have more stability than the corresponding positive ones and better rigidity than similar double-curvature cable nets. One critical factor to be considered when designing double-curvature cable domes is the effect of changing geometry on the optimized weight and displacement of such structures. Several geometrical parameters may affect the size and prestress optimization of these forms, in terms of structural weight and stiffness, such as number of hoops and sectors, height/diameter, rise/sag, and inner hoop diameter. This paper investigates the effect of such parameters on the optimized weight and prestress level of this new form at several maximum displacements. The optimization technique adopted in the current study depends on prestressing the dome with an initial value of prestress level that ensures starting from a feasible state, i.e., with no slack in cables. Then, the prestress level is increased incrementally until reaching a maximum displacement of less than span/1000. At each increment, the dome is optimized to the minimum weight. The optimized values at each increment are fitted to power curves that relate both the optimized weight and prestress level to the maximum displacement. These fitted design curves are developed for a dataset of the geometrical parameters stated above and compared based on two criteria; the first is the optimized weight at maximum displacement equal to span/250 as recommended by design codes, while the second is the effect of increasing the dome stiffness on the optimized weight when decreasing the maximum displacement from span/250 to span/1000.
On the Geometry Effect on Double-Curvature Cable Domes
Lecture Notes in Civil Engineering
Desjardins, Serge (editor) / Poitras, Gérard J. (editor) / El Damatty, Ashraf (editor) / Elshaer, Ahmed (editor) / Ahmed, Elshaimaa A. (author) / Damatty, Ashraf A. El (author)
Canadian Society of Civil Engineering Annual Conference ; 2023 ; Moncton, NB, Canada
Proceedings of the Canadian Society for Civil Engineering Annual Conference 2023, Volume 12 ; Chapter: 22 ; 267-277
2024-12-13
11 pages
Article/Chapter (Book)
Electronic Resource
English
NURBS-based form-finding algorithm for double-curvature cable domes
| Elsevier | 2023