O’Hare Air Traffic Control Tower & Base Building

This new air traffic control tower and base building are located at O’Hare international Airport in Chicago, Illinois. The base building is a one-story building with a steel structure and a braced lateral system. The tower is approximately 245 feet high and consists of a series of reinforced concrete cylinders placed concentrically upon each other to form a tower. The cab of the tower has insulating panels on metal studs above and below the vision panels. The roof of the tower is a metal deck and concrete on top spanning between horizontal beams. Hinman’s technical approach was first to determine critical threat locations and than calculate air-blast parameters (pressure, impulse, shock front velocity) for these locations. Each scenario included dynamic non-linear analysis of individual elements and dynamic non-linear analysis of a multi-material window curtain wall system.

Computations were performed using BAM, our in-house program which uses non-linear dynamic structural analysis using energy methods, lumped mass models, and empirical relations developed from explosive test data.

Hinman provided structural analysis for compliance with the air-blast requirements under Facility Security Management Program. Several representative structural elements were analyzed for response to air-blast effects due to the designated explosive threats. Hinman’s technical approach included:

  • Determination of critical threat locations
  • Calculation of air-blast parameters
  • Analysis of individual elements
  • Analysis of window curtain wall system
  • Comparison of results to evaluation criteria, consistent with the required level of protection to determine predicted response

Computations were performed using BAM, our in-house program which uses non-linear dynamic structural analysis using energy methods, lumped mass models, and empirical relations developed from explosive test data. The scope included air-blast design/analysis computations in support of a 95% complete design submittal. In addition, subcontractor drawings and calculations were reviewed to verify compliance with defined criteria.