Commercial open web steel truss roof safely can carry new air conditioning unit

Commercial open web steel roof trusses and main I beams

3D STAAD PRO model after addition of new make up air conditioning unit of a commercial building in NE of Calgary. The open web steel joists are HSS steel sections with bracing of bottom chords at the middle and end of roof trusses. The roof was safely capable of carrying the new air conditioning unit.

Steel building structural assessment near Calgary city limits

Steel farm building in Foothills Alberta

A previous steel farm building is structurally assessed by AERZ Consulting Inc. using current Alberta building code to change building occupancy and use. The building is 41 ft long by 33 ft wide by 20 ft ridge height. Building and foundations were assessed at the Municipality of Foothills in Alberta; very close to Calgary city limits. The main building steel frames are tapered welded wide flanges while purlins and girts are cold formed Z sections. Dead loads, snow loads, wind and earthquake loads were applied to the building and building elements checked against such loads and there load combinations. The structural analysis and design checks were performed using STAAD PRO software.

Commercial unit roof assessment in SE Calgary

Wooden steel open web truss_commercial unit-SE-Calgary

AERZ civil structural consulting Inc. has done structural assessment of a commercial unit roof at south east Calgary. The owner of the commercial wanted to add a new heavy HVAC unit on top of the roof. The structural assessment found that the roof will not be safe by 25% if the HVAC unit will be installed on the roof (25% over stressed than allowable design values). The roof trusses are wood steel open web trusses with steel tube sections as vertical web members and wooden upper and lower horizontal chords held together by pins. An Engineering solution was provided to owner to support the roof trusses carrying the HVAC unit.

Supporting an open web roof truss of a commercial unit

Roof Open web wood steel truss with pins We have provided a design modification for a roof of a commercial building in south east of Calgary. The roof span consists nearly 50 feet span that is supported by open web wooden steel trusses with pin joints connecting the steel vertical tubes to the wood upper and bottom chords of trusses. The roof is suppose to carry a new heavy high volume air conditioner unit (HVAC) that can not be carried by the old roof trusses.