Roof Deck Poisson Ratio

Poisson s ratio ν is often used to characterize the elastic properties of a material.

Roof deck poisson ratio.

The poisson s ratio express the relative contraction strain or transverse strain normal to the applied load to the relative extension strain or axial strain in the direction of the applied load. Red status lights for lateral load cases in ram frame. μ ε t ε l 1 where. As with the example of a rubber band when we stretch the length axial the cross sectional width gets reduced transverse and vice versa.

Vulcraft manufactures many different types of deck including roof deck floor deck composite floor deck and cellular deck. Poisson s ratio can be expressed as. The ratio of the relative contraction strain transverse lateral or radial strain normal to the applied load to the relative extension strain or axial strain in the direction of the applied load. Where d ed 3 12 1 μ 2 is the flexural rigidity of the plate e is young s modulus of the plate µ is poisson s ratio w is the vertical deflection and q is the external uniform load.

During this stretching in the vast majority of cases the cross section of the material decreases poisson s ratio shows how the cross section of a deformable body changes under lengthwise stretching or compression. When a stretching force is applied lengthwise to a solid the solid starts to stretch. For full details about these or any of our products contact your local vulcraft office. As shown in figure 3 the metal roof can be simplified as a thin plate with two opposite simply supported edges two free edges and subjected to a uniformly distributed load.

Consider 1 1 2 vulcraft type b 20 ga design thickness 0 0358in. μ poisson s ratio. For a composite deck the factor should be incorporated into the effective thickness that is defined with the deck properties. I use ram structural system s frame module for my lateral analysis of steel framed buildings with the following parameters for this type of roof deck.

Poisson s ratio is the negative of the ratio of lateral strain transverse to the linear strain axial. A full line of deck accessories such as end closure and pour stop is also available from vulcraft. 0 30 same as steel elastic modulus. For example if you have 4 inches of concrete above the flutes and want to use 0 35ig the effective thickness would be 0 35 4 1 4 inches.