Title: Phoenix Airport Terminal Building-A Prestressed Challenge
Author(s): Walter E. Riley
Publication: Journal Proceedings
Appears on pages(s): 137-150
The new Phoenix Municipal Airport Terminal roof consists of twenty-two 8 ft wide prestressed T-beams 152 ft long supported on cast-in-place concrete girders. The T-beams have a clear span of 84 ft and cantilever at each end, 34 ft. It was desired to expose the end of the T-beams and to limit the depth to 3 ft. This results in a shallow beam having a depth to span ratio of l/28. A combination pretensioned and post-tensioned design was approved for the building, subject to testing for deflection control. Prestressed tees with long overhangs may be safely analyzed for strength using theoretical mechanics; however, only instantaneous deflections can be calculated accurately. Long-time deflections should be predicted by load testing. Deflection analysis, load tests, and field deflections are discussed.