Secondary Stress within the Structural Frame of DYE-3: 1978-1983.
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
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DEW line ice cap station DYE-3 was moved sideways 210 ft and placed on a new foundation in 1977, then raised 27 ft in 1978. Secondary forces within the structural steel framework were measured in 1978, 1981, 1982, and 1983. The overall level of secondary stresses had increased but through 1983 the columns were still within their stress limitations. Some localized overstress is expected in 1984. The concept of using above-surface trusses to resist wind loads and brace the eight columns has proven to be satisfactory. It has eliminated the subsurface enclosures used in the past to protect subsurface trusses, enclosures that proved to be the structural weak link of the original facility their elimination has resulted in a stronger facility that is easier to maintain. The measurements and findings of this program were used in the development of the design to extend the life of DYE-3 to be implemented in 1984. That work should reduce the level of secondary stresses in the frame.
- Structural Engineering and Building Technology