Horizontal Shearing Of A Roof Trust

In a nutshell it s made up of a central vertical post called the king post two rafters meeting at the apex and a tie beam or the horizontal base.

Horizontal shearing of a roof trust.

A timber roof truss is a structural framework of timbers designed to bridge the space above a room and to provide support for a roof trusses usually occur at regular intervals linked by longitudinal timbers such as purlins the space between each truss is known as a bay. This article focuses on typical single storey industrial buildings where trusses are widely used to serve two main functions. Typically they are lapped and then toe nailed together in its center so that the correct length can be achieved. It is often used in simple roof trusses such as in the shed porch and garage.

To provide horizontal stability. The king post roof truss is the simplest of the trusses because of its simple composition. When the framing of the roof is put together quite frequently two of the ceiling rafters will be fixed together as this will create a much longer span. A sagging roof line may original from the ceiling s horizontal rafters.

To carry the roof load. The run or the base number is 12 inches. Properly designed drag strut trusses shear walls or roof diaphragms and their connections will transfer lateral loads to the foundation and then safely into the ground. The rise will be the elevation change over the 12 inches.

For example a slope of 6 12 means for every 12 inches of horizontal distance the slope of the roof will rise 6 inches vertically.