Situation
An elementary school project in Oakville, Ontario included a gymnasium area requiring long-span open web steel joists (OWSJ) to support roof loads and suspended gym equipment. The joist spans were approximately 19 m and were required to accommodate ceiling-suspended basketball systems, gym divider curtains, mechanical ductwork running between joists, and roof-top units with associated snow accumulation.
Due to extended lead times from the joist manufacturer, the fabricator sought an alternative solution to avoid schedule delays while maintaining full compliance with the project’s structural and performance requirements.
Engineering Scope
Engaged by the steel fabricator, services included structural design of the open web steel joists and the associated bridging system for the gymnasium roof structure.
The scope involved determination of governing gravity and superimposed loads, coordination of suspended equipment loading, design of joist members and bridging for strength and serviceability, and development of a practical joist configuration suitable for in-house fabrication.
A complete package of structural calculations and detailed shop drawings was prepared for submission to the prime consultant for review and approval.
Key Engineering Considerations
Long-span joist behavior and deflection control for a gymnasium space
Coordination of ceiling-suspended athletic equipment and mechanical services
Snow accumulation associated with roof-top units
Bridging design for stability during erection and in service
Optimization of member sizes for efficient fabrication
Compliance with applicable steel design standards and project criteria
Outcome
An optimized open web steel joist and bridging system was developed that met all structural, serviceability, and constructability requirements while allowing the fabricator to proceed without reliance on extended manufacturer lead times.
The design enabled timely fabrication and installation, supported successful consultant review, and avoided schedule impacts to the overall project. Following completion, a structural sign-off letter was issued at the client’s request. The fabricator expressed satisfaction with the clarity, efficiency, and outcome of the engineering support provided.
Long-span joist systems with suspended equipment and tight fabrication schedules benefit from involvement of an experienced structural engineer in Toronto to balance serviceability, constructability, and project timing.
Related Engineering Services
Open web steel joist design
Specialty structural engineering and fabrication support
Discuss a Similar Engineering Challenge
If you’re planning a project involving long-span joists, suspended equipment, or fabrication-driven scheduling constraints, we can provide practical structural design and documentation. Contact a structural engineer.