Roof Diaphragm Design

Each of these different deck types are described in the steel deck institute sdi publication no 31 design manual for composite decks form decks and roof decks.

Roof diaphragm design. The roof diaphragm is designed to transfer shear forces from the loaded side of the building into the shearwalls run ning parallel to direction of the load. Due to failures of some roof diaphragms. It is usually constructed of wood sheathing steel deck or concrete. A horizontal timber or metal resting at the peak of the roof the rafters and trusses are connected to the ridge board for a cohesive framework.

The diaphragm can be thought of as a horizontal beam or as a plate element. A composite decking made of solid materials it resembles real wood and particularly strong and stable for bearing heavy load. In its most basic form a diaphragm behaves as if it were a short deep beam. In structural engineering a diaphragm is a structural element that transmits lateral loads to the vertical resisting elements of a structure such as shear walls or frames.

Section 2305 general design requirements for lateral force resisting systems 2305 1 general. Steel roof and floor deck diaphragm design requires careful attention to load paths stiffness variations fastener types and regional preferences figure 1. Just as the floor or roof is checked for vertical load capacity it is considered a diaphragm in the plane of the floor and check for shear when designing the lateral force resisting system. Structures using wood frame shear walls or wood frame diaphragms to resist wind seismic or other lateral loads shall be designed and constructed in accordance with af pa sdpws and the applicable provisions of sections 2305 2306 and 2307.

The roof diaphragm design example can go up against different style that when nitty gritty right can ooze a cutting edge feel. Diaphragms are typically horizontal but can be sloped such as in a gable roof on a wood structure or concrete ramp in a parking garage. Download profis df diaphragm now. The roof diaphragm is not designed to resist the lateral forces generated in the build ing that act to pull opposite walls away from each other.

Roof diaphragms may be assembled from a wide variety of panel profiles including narrow rib nr intermediate rib ir and wide rib wr. It is a waterproofing layer made of regular felt stacked above the solid. Shear diaphragms are commonly used in buildings as a means of transmitting lateral loads. Just input data including the design method relevant loads deck type support construction and hilti profis df diaphragm will calculate the fasteners and systems for your project.