الفهرس | Only 14 pages are availabe for public view |
Abstract The main purpose of this thesis is to develop an optimum design algoritlun for large skeletal structures considering both members’ cross sections and geometry of the structure as the main design variables. A numerical procedure for static analysis of nonlinear three-dimensional structures is displayed in details, which is based on minimization of the total potential energy. Optimality criteria methods are developed for optimum design of large skeletal structures with displacement, stress, and buckling constraints. An Optimality criterion rOC] is developed for the optimum geometry design. A geometric optimization procedure is proposed combining both the derived [OC] method and the generalized compound scaling algorithm [GCS]. Numerical investigation is carried out for the proposed hybrid method for optimum geometry design by solving some of the published design problems. The proposed algoritlun is applied to latticed dome structures and guyed towers considering the members’ cross sections, the shape of the structure, and the initial pretension in cables of the towers as the main design variables. The effect of different design parameters on the optimum design of guyed towers is also studied. Summary, conclusions, and suggestions for the future researches are presented in the light of the obtained results. |