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更新日期：2013-02-09
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Builders use hollow rectangular beams in construction because such beams can withstand the forces of shearing and bending in both the x- and y-directions. They are also resistant to torsional forces, much more so than I-beams. To calculate strains on hollow square/rectangular beams, you must know the cross-sectional area and various moments of inertia in both the x- and y-directions.
