Research on load-bearing mechanism of sandwich insulation composite wall of prefabricated grain storehouse

To enhance national food security and accelerate the upgrading of grain storehouse into "green storage", and achieve the strategic goal of "high-quality grains, high-quality grain storage", this paper proposes a new type of prefabricated grain storehouse structure system based on the advantages and disadvantages of existing grain storehouse by adopting sandwich insulation composite walls. A 1:2 scale precast sandwich insulation composite wall was designed and fabricated. The static loading test was carried out to explore the wall's failure mode, bearing capacity and the cooperative working performance of the inner and outer wall. Combined with numerical simulation, the crack development, flexural deformation and strain development law of the wall were analyzed, and the bearing mechanism of the sandwich insulation composite wall of the prefabricated grain storehouse under the action of grain load was further revealed. Using the limit equilibrium method and the energy method, we established a calculation model for the ultimate load of the wall panel under three-sided support constraints and proposed a calculation formula for the ultimate bearing capacity of the prefabricated grain storehouse sandwich insulation composite wall. The theoretical values are in good agreement with the experimental and simulated values, with a relative deviation of less than 8 %. This indicates that the model is sufficient for calculating the bearing capacity of prefabricated walls under these constraints and can provide a reference for engineering design and research.