Lightweight design of greenhouse frame structure considering mechanical load and thermal load

In order to explore the influence of temperature change on the safety of greenhouse skeleton structure, an optimal design model of greenhouse skeleton thermoelastic structure considering mechanical load and thermal load was established. With the goal of minimizing the maximum stress value of the structure under mechanical load and thermal load, and choosing the total material consumption of the structure as the constraint, the stress distribution under the combined action of mechanical load and thermal load was considered to achieve the optimal design of the continuum structure of the greenhouse framework, so that the structure could minimize the stress concentration of the structure under the premise of meeting the support stiffness. Considering the design dependency and intermediate variables in the thermal stress optimization problem, the density filter function was used to obtain a clear optimal topology. Through two typical greenhouse frame optimization examples, the maximum equivalent stress of the optimized structure under different temperature changes and material consumption was compared. The results showed that the maximum equivalent stress optimization efficiency of the model could reach about 15% under the same volume fraction. Under the same load conditions, increasing the volume ratio by 0.1 could achieve an increase of nearly 1% in the maximum equivalent stress optimization effect of the structure. The obtained conceptual design scheme of the greenhouse skeleton structure has guiding significance for the design of the greenhouse skeleton structure in engineering applications.