Optimización de estructuras de invernadero por algoritmos genéticos

Abstract

In this work we analyze three structural alternatives of multitunel greenhouses, foundations are included, in order to calculate the price per square meter. Later, optimization is done by genetic algorithms to reduce the cost (€/m2) initially obtained. The three structural alternatives were analyzed (with and without optimization) using a second order 3D matrix analysis, so that takes into account the influence of the structural elements contained in the plane of the structure and perpendicular to the plane of the structure (purlin, gutter and stay). Two software solutions for the analysis has been programmed using Matlab, in which the user chooses different variables: loads, section properties..., and checks the structure and foundation. Each software shows: (i) the cost per square meter of greenhouse (with and without optimization, depending of the program used ); (ii) reports the cross-section and member verifications according to the ultimate limit state of the Eurocode 3. In relation to the three structural alternatives, these variations are achieved modifying the design of the greenhouse taken as a basis: a) eliminating structural elements b) modifying the separation between frames increasing the rigidity of the gutter and purlins.