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Parametric Study of a Cable Dome of Geiger-Type
Cable and membrane structures are typically geometrically flexible and are subject to larger deflections under loads when compared to geometrically rigid structures. As one of the well-known types of cable roofs, the preliminary design of cable domes requires assigning appropriate prestress to the cables and struts taking into account the strength, stability, and serviceability requirements under different load conditions according to design codes. The ideal prestress is assigned initially based on the geometrical arrangements of cables and struts then magnified according to the load carrying capacity of the dome. The arrangement of cables and struts can affect the ideal prestress and, eventually, the total weight and maximum displacement of the dome under service loads. In this regard, this study performs a parametric study to investigate the sensitivity of some geometrical parameters (radial divisions and number of sectors) to the maximum displacement and total weight of a cable dome of Geiger-type. A code was developed to determine the initial prestress of 12 domes (with configurations of 2 hoops and 10 sectors up to 4 hoops and 20 sectors) using singular value decomposition technique. Then, 12 domes were modeled using SAP2000 and subjected to service loads according to the NBCC code. The results of this study showed that the total weight and maximum displacement remain relatively constant when increasing the number of sectors. On the other hand, increasing the number of hoops leads to significantly less displacement and a heavier dome. Based on these results, it can be concluded that domes with a larger number of hoops perform better under external loading but resultantly are heavier and therefore more expensive.
Parametric Study of a Cable Dome of Geiger-Type
Cable and membrane structures are typically geometrically flexible and are subject to larger deflections under loads when compared to geometrically rigid structures. As one of the well-known types of cable roofs, the preliminary design of cable domes requires assigning appropriate prestress to the cables and struts taking into account the strength, stability, and serviceability requirements under different load conditions according to design codes. The ideal prestress is assigned initially based on the geometrical arrangements of cables and struts then magnified according to the load carrying capacity of the dome. The arrangement of cables and struts can affect the ideal prestress and, eventually, the total weight and maximum displacement of the dome under service loads. In this regard, this study performs a parametric study to investigate the sensitivity of some geometrical parameters (radial divisions and number of sectors) to the maximum displacement and total weight of a cable dome of Geiger-type. A code was developed to determine the initial prestress of 12 domes (with configurations of 2 hoops and 10 sectors up to 4 hoops and 20 sectors) using singular value decomposition technique. Then, 12 domes were modeled using SAP2000 and subjected to service loads according to the NBCC code. The results of this study showed that the total weight and maximum displacement remain relatively constant when increasing the number of sectors. On the other hand, increasing the number of hoops leads to significantly less displacement and a heavier dome. Based on these results, it can be concluded that domes with a larger number of hoops perform better under external loading but resultantly are heavier and therefore more expensive.
Parametric Study of a Cable Dome of Geiger-Type
Lecture Notes in Civil Engineering
Gupta, Rishi (editor) / Sun, Min (editor) / Brzev, Svetlana (editor) / Alam, M. Shahria (editor) / Ng, Kelvin Tsun Wai (editor) / Li, Jianbing (editor) / El Damatty, Ashraf (editor) / Lim, Clark (editor) / Tulloch, Hannah (author) / Ahmed, Elshaimaa (author)
Canadian Society of Civil Engineering Annual Conference ; 2022 ; Whistler, BC, BC, Canada
Proceedings of the Canadian Society of Civil Engineering Annual Conference 2022 ; Chapter: 17 ; 263-273
2024-02-06
11 pages
Article/Chapter (Book)
Electronic Resource
English
Parametric Study of a Cable Dome of Geiger-Type
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