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Structural fatigue in the 34-meter HA-Dec antennasStructural modifications to the 34-m hour-angle-declination antennas, coupled with the use of the antennas beyond their intended lifespans, have led to structural fatigue, as evidenced by damage to the declination drive gear and cracks on the structural members and gussets. An analysis and simulation were made of the main antenna structural members. The analysis showed that the total stress to the antenna structure substantially exceeds the maximum levels recommended by the American Institute of Steel Construction (AISC). Although each of the separate static conditions of stress is only 50 percent of the total stress and does not reach the AISC reduced yield limit, fatigue can and did occur, causing the material to crack in the weakest places.
Document ID
19900012586
Document Type
Reprint (Version printed in journal)
Authors
Vanhek, R. A. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Saldua, B. P. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
September 6, 2013
Publication Date
February 15, 1990
Publication Information
Publication: The Telecommunications and Data Acquisition Report
Subject Category
STRUCTURAL MECHANICS
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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