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Is the deck considered an isotropic material or will there be different stiffnesses in each direction?

April 26, 2017deck different direction isotropic material

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Is the deck considered an isotropic material or will there be different stiffnesses in each direction?

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ETABS considers the deck as an isotropic material. Isotropic behavior is usually assumed for steel and concrete, although that is not always the case. The behavior of an isotropic material is independent of the direction of loading. In addition, the shearing behavior is uncoupled from the extensional behavior and it is not affected by temperature change.