Challenge

The BOK Center presented an architectural paradox: to create Cesar Pelli’s iconic vision for a 565,000 SF arena, with no two exterior walls sharing the same radius or geometry. The building’s envelope required thousands of one-of-a-kind components, including the centerpiece—an 80-foot cantilevered glass curtain wall comprising 60,000 square feet of custom-fabricated glass panels—each dimensionally unique and engineered to withstand 100-mph wind loads. The cantilever introduced a critical structural risk: any residual camber in the support system would compromise the glass installation, leaving no margin for error. As Tulsa Vision Builders, Flintco and Manhattan Construction were tasked with coordinating more than 600 workers, fabricators, and installers while maintaining millimeter-level precision across every interface.

Solution

The team leveraged 3D modeling software—advanced for its timeframe—to digitally coordinate structural steel, glazing, and building systems, producing precise shop drawings for every custom panel before fabrication. To address the cantilever challenge, engineers applied calculated superimposed loads to the 8-foot-square box beam structure, removing camber before glass installation. Precise load release calculations prevented movement that could jeopardize the curtain wall. As a contingency, the team designed cavities in the box beam to accommodate the insertion of self-leveling granular material for post-installation adjustments. Rather than conventional framing, the team specified a panelized composite system with pre-applied waterproofing, enabling crane-set installation that accelerated the building’s dry-in schedule despite encountering a historic 20-day ice storm.

Result

Our team delivered the region’s largest capital project on schedule in 36 months. All custom panels met the specified tolerances during the first installation. The glass curtain wall—now an iconic downtown landmark—met all structural and aesthetic requirements without requiring contingency adjustments. The project established new regional benchmarks for complex geometry execution in large-scale construction.