Identification of optimal rise-to-spanratios of a dome space frame

Vestnik MGSU 9/2013
  • Shirokov Vyacheslav Sergeevich - Samara State University of Architecture and Civil Engineering (SSUACE) postgraduate student, Department of Metal and Timber Structures, Samara State University of Architecture and Civil Engineering (SSUACE), 194 Molodogvardeyskaya st., Samara, 443001, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 32-40

In this paper, the author considers the issues of design of domed space lattice frames, circular in plan and having rectangular center nets. These structures have several variables influencing their mass. Span width and dome rise are their modifiable parameters. Their fixed parameters include topology, net-to-net distance, length of top net rods, type of the transverse cross-section of rods, and the construction material. Their constraints include the tensile strength of elements, the stability of compressed elements, restrictions applied to the rigidity of a structure, and restrictions applied to the span size. The task of finding the optimal rise-to-span ratio was solved by introducing successive changes into variables. The value of the span was changed at the increments of 10 meters, while the rise was changed at the increments equal to 5 meters.As a result of a series of calculations, values of variable parameters of a convex spatial lattice frame having tubular sections and different ratios were obtained. If the value of a span is within the 30 m≤l< 60 meters range (where l is the span of a structure), the optimal rise value rests within (1/5 to 1/8)l. The optimal rise is (1/4 to 1/5)l for spans above 60 meters.

DOI: 10.22227/1997-0935.2013.9.32-40

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