Wind Uplift On Roof Joists

Assumptions dimensions designations joist design for wind uplift properly specifying uplift joist design by manufacturer for.

Wind uplift on roof joists.

Tb 824 trus joist tji joists in ceiling applications. The technical bulletin below explains the design considerations such as bottom flange bracing and uplift connections at bearing. Under typical gravity loading a joist experiences compression stress in the top flange. When is uplift bridging needed.

Tb 805 tji joists in rafter. How should seismic and wind loads be specified. Tb 125 wind uplift design for trus joist tji roof joists. By providing a complete load diagram to the manufacturer.

These uplift loads may result in stress reversals in tji roof joists and uplift reactions at bearing locations. Tb 310 use of topical coatings with weyerhaeuser engineered wood products. Design of steel joists and roof decks michael r. 6 design of steel joist roofs to resist uplift loads.

Wind uplift design for trus joist tji roof joists in many commercial buildings wind loading may result in uplift loads on roof rafters. Uplift reactions can occur with gravity loads on multiple bearing trusses or with high wind conditions. Tb 827 wall tension tie connectors for tji joists. Uplift bridging is required whenever the bottom chord goes into compression.

In order for a structure to be sound and secure the foundation roof and walls must be strong and wind resistant. Roof trusses can be found in the commentary for asce 7 as examples of both mwfrs and c c. The customary truss to bearing connection of three toenails may not develop enough resistance for the calculated uplift reaction. See the sji code of standard practice for additional information.

New uplift loads can induce stress reversals in tji roof joists as well as uplift reactions at bearing locations. The steel joist institute discusses the key points of technical digest no. When building a structure it is important to calculate wind load to ensure that the structure can withstand high winds especially if the building is located in an area known for inclement weather. Topics for discussion design responsibility what is a standard joist.

Also receives wind load directly from the roof sheathing i e cladding and therefore acts as a component which puts the truss into the c c category. This will be true if there are net concentrated up loads.