Optimal geometry design of single layer lamella domes using charged system search algorithm

Domes are lightweight and elegant structures that provide cost effective solutions to cover large areas. They are also exceptionally suitable structures for covering places where minimum interference from internal supports are required. The behavior of latticed domes is nonlinear due to change of geometry under external loads. This is due to the imperfections arising either from the manufacturing process and/or from the construction of the structure.In this paper, the optimum topological design problem of geometrically nonlinear single layer latticed dome is considered. The design problem is formulated such that the total number of rings, the height of the crown, and the steel pipe section designations required for the member groups in the dome are treated as design variables. The serviceability and strength requirements are considered in the design problem of lamella domes as specified in LRFD-AISC. The optimum solutions of the design problem are obtained using the charged system search algorithm. Also, the charged system search (CSS) algorithm is inspired by the Coulomb and Gauss laws of electrostatics in physics and the governing laws of motion from Newtonian mechanics.

Keywords:

Charged system search , Repetitive structures , Dome optimization , Discrete design