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Mechanics of Composite Structures by George S. Springer, László P. Kollár

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6.8 Stiffened Thin-Walled Beams

Thin-walled structures are often reinforced with longitudinal stiffeners and trans-verse frames. Illustrations of such reinforced (semimonocoque) structures are airplane wings and fuselages (Fig. 6.80). In many applications such structures may be treated as reinforced thin-walled beams. Then, to simplify the analysis, the beam is idealized by representing the stiffeners as concentrated areas, sometimes called flanges or booms (Fig. 6.81). It is assumed that the flange carries all the bending load, and the web between the flanges carries the shear load. In the following we analyze stiffened beams in which the web is orthotropic.

Figure 6.81: An actual and the idealized stiffened thin-walled beam.

The tensile stiffness ...

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