Shape Optimization of Assembled Single-Layer Grid Structure with Semi-Rigid Joints

This paper takes the effect of the semi-rigid joints into account to optimise the assembled free-form single-layer grid structure. Based on the experimental results of the semi-rigid joints, finite element models of single-layer grid structure with semi-rigid joints are established, and virtual spring elements are used to simulate the joint stiffness. The optimisation process is completed with the parallel collaboration of ANSYS and MATLAB data. The research goal is to minimise the total strain energy. Genetic algorithm is used for the optimisation, and the nodal z-coordinates are chosen as variables. The effect of the semi-rigid joints on the shape optimisation is studied by changing the joint stiffness. With this method, the optimal shapes of assembled grid structure with different joint stiffness and improved buckling load are obtained.