Wind Uplift On Roof Joists

The technical bulletin below explains the design considerations such as bottom flange bracing and uplift connections at bearing.

Wind uplift on roof joists.

Tb 813 trus joist tji joist residential bonus room span tables. 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 include the design requirements of the asce sei 7 10 wind provisions for open web steel joists and joist girders and the end anchorage and bridging considerations for uplift loads on steel joists. Tb 125 wind uplift design for trus joist tji roof joists.

Tb 824 trus joist tji joists in ceiling applications. Tb 125 wind uplift design for trus joist tji roof joists. 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.

These uplift loads may result in stress reversals in tji roof joists and uplift reactions at bearing locations. When is uplift bridging needed. Tb 827 wall tension tie connectors for tji joists. 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. See the sji code of standard practice for additional information. Uplift bridging is required whenever the bottom chord goes into compression.

New uplift loads can induce stress reversals in tji roof joists as well as uplift reactions at bearing locations. Under typical gravity loading a joist experiences compression stress in the top flange. How should seismic and wind loads be specified. In order for a structure to be sound and secure the foundation roof and walls must be strong and wind resistant.

By providing a complete load diagram to the manufacturer. Wind uplift design for trus joist tji roof joists in many commercial buildings wind loading may result in uplift loads on roof rafters. This will be true if there are net concentrated up loads. 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.

Assumptions dimensions designations joist design for wind uplift properly specifying uplift joist design by manufacturer for. The steel joist institute discusses the key points of technical digest no.