Abstract: Composite and its sandwich structures are featured in high strength, corrosion resistance, energy-saving, insulation and heat preservation, etc. The paper tries to forge a lattice plate interface plus paulownia wood core composite beam by taking glass fiber reinforced composite as the surface layer and the lattice plate, by using paulownia wood as the core material and by adopting the molding process of vacuum infusion. It makes an experimental comparative study between the four-point (on planes and flanks) flexural property of wood beam and that of the non-lattice wood core beam and lattice wood core beam under the condition that total sizes of the test items remain unchanged. The paper has come out with the conclusion that: when a same test item is under pressure, the ultimate bearing capacity and rigidity of the plane are higher than those of the flank; the ultimate bearing capacity and rigidity of non-lattice wood core beam and lattice wood core beam test items are higher than those of wood beam test items; the ultimate bearing capacity and rigidity of lattice wood core beam test items are higher than those of non-lattice wood core beam test items.

Key words: composites, lattice web, flexural behavior, wooden core beam