Roof Deck Poisson Ratio

When a stretching force is applied lengthwise to a solid the solid starts to stretch.

Roof deck poisson ratio.

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. 0 30 same as steel elastic modulus. 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. Ram structural system ram modeler ram structural system ram steel ram structural system ram steel ram structural system tutorial.

μ ε t ε l 1 where. μ poisson s ratio. Poisson s ratio is the negative of the ratio of lateral strain transverse to the linear strain axial. As with the example of a rubber band when we stretch the length axial the cross sectional width gets reduced transverse and vice versa.

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. For a composite deck the factor should be incorporated into the effective thickness that is defined with the deck properties. 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. The ratio of this change is called poisson s ratio.

Vulcraft manufactures many different types of deck including roof deck floor deck composite floor deck and cellular deck. 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. Poisson s ratio can be expressed as. For full details about these or any of our products contact your local vulcraft office.

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. A full line of deck accessories such as end closure and pour stop is also available from vulcraft. Consider 1 1 2 vulcraft type b 20 ga design thickness 0 0358in. 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.