Studies on New-Style Reticulately Stiffening Thin-Walled Roof Systems by Bionic Modeling of a Dragonfly Hind Wing

Firstly, the high resolution picture of a dragonfly hind wing from a sample test was studied, and the unique feature of the reticulate vein stiffening wing structure was figured out; then two computational models of the wing were established, Beam 189 and Shell 93 elements in ANSYS were employed respectively in modeling of the veins and the membrane to ensure the compatibility between the veins and the membrane at a deformed state. It is shown that the cambered corrugation in the wing structure can improve the wing flexural stiffness and optimize the stress distribution in its veins and membrane effectively;and properly arranging tetragon grids and hexagon grids in hybrid models can realize a balance between the economical material consumption and stiffness improvement. Finally, three new-style reticulately stiffening thin-walled roof systems with different grid forms and grids arrangement were proposed, and their superior structural performances were illuminated.