Optimization of Spherical Reticulated Shells in Design-build Contract Mode

The structural optimization of spherical reticulated shells is not only a problem of reducing of the steel consumption in the design-build contract mode. There are several objective functions in the question. We should also consider reduction in transport costs and storage charges of components, construction difficulty and construction period. The number of member types is used as a substitute for the secondary indicators by correlation analysis. The objective function is the number of member types and the steel consumption in the end. We carry out the bi-objective optimization by iterative experimental design. The operation process of the method is explained by a case study of 60-meter-span Kewitte single-layer spherical reticulated shell. The example shows this method reduces computational workload, and the convergence rate is fast.