Optimal reshaping and stress controlling of double-layer spherical structures under vertical loadings
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Faculty of Civil and Environmental Engineering, Gdańsk University of Technology, 80-223 Gdańsk, Poland
Civil Engineering Department, University of Raparin, Rania, Kurdistan Region, Iraq
Faculty of Civil Engineering, University of Tabriz, Tabriz, Iran
Submission date: 2022-06-21
Final revision date: 2022-08-08
Acceptance date: 2022-09-15
Publication date: 2022-12-31
Archives of Civil Engineering 2022;68(4):591-606
Architectural structures’ nodal coordinates are significant to shape appearance; vertical overloading causes displacement of the joints resulting in shape distortion. This research aims to reshape the distorted shape of a double-layer spherical numerical model under vertical loadings; meanwhile, the stress in members is kept within the elastic range. Furthermore, an algorithm is designed using the fmincon function to implement as few possible actuators as possible to alter the length of the most active bars. Fmincon function relies on four optimization algorithms: trust-region reflective, active set, Sequential quadratic progra mming (SQP), and interior-point. The fmincon function is subjected to the adjustment technique to search for the minimum number of actuators and optimum actuation. The algorithm excludes inactive actuators in several iterations. In this research, the 21st iteration gave optimum results, using 802 actuators and a total actuation of 1493 mm.MATLAB analyzes the structure before and after adjustment and finds the optimum actuator set. In addition, the optimal actuation found in MATLAB is applied to the modeled structure in MATLAB and SAP2000 to verify MATLAB results.
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