Roof Deck Poisson Ratio

The ratio of this change is called poisson s ratio.

Roof deck poisson ratio.

Poisson s ratio ν is often used to characterize the elastic properties of a material. Vulcraft manufactures many different types of deck including roof deck floor deck composite floor deck and cellular deck. Poisson s ratio is a measure of the poisson effect that describes the expansion or contraction of a material in directions perpendicular to the direction of loading the value of poisson s ratio is the negative of the ratio of transverse strain to axial strain for small values of these changes is the amount of transversal expansion divided by the amount of axial compression. As with the example of a rubber band when we stretch the length axial the cross sectional width gets reduced transverse and vice versa.

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. For a composite deck the factor should be incorporated into the effective thickness that is defined with the deck properties. 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. μ poisson s ratio.

For full details about these or any of our products contact your local vulcraft office. 0 30 same as steel elastic modulus. μ ε t ε l 1 where. When a stretching force is applied lengthwise to a solid the solid starts to stretch.

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. 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. 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. 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.

A full line of deck accessories such as end closure and pour stop is also available from vulcraft. 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. Red status lights for lateral load cases in ram frame.