Citation
Abstract
The June 28, 1992, Landers earthquake ground motion records at the Echo site (DSS-12 antenna) were adjusted to provide a better match with spectra from the measured Mars site (DSS-14 antenna) instrument tower response. A finiteelement model of the antenna structural system was analyzed for response to this ground motion. Dynamic forces and displacements were computed in the locality of components that had failed during the earthquake. Calculated forces in the range of from 30,000 to 35,000 Ib on failed Y-axis actuator U-joints were consistent with laboratory load tests. The load capacity of these joints was found to be below the range of from 34,000 to 42,000 1b. Dynamic amplification factors of from 6 to 16 were computed for the quadripod apex accelerations with respect to the ground accelerations. The largest amplification factor—25—was found at the outboard end of the X-actuator. meter Antenna Earthquake Damage Investigation, vols. 1 and 2,
Details
- Volume
- 42-113
- Published
- May 15, 1993
- Pages
- 130–146
- File Size
- 730.4 KB