Static and Dynamic Testing : Tower Number 4 Unstrung.

Technical Report · Thu Jan 01 00:00:00 EST 1976

OSTI ID:6799618

Cameron, George R; LeBrun, Jay

Static and dynamic field testing of an unstrung transmission line tower, Suspension Tower Number 4 at the Moro (Oregon) Mechanical Test Facility, Bonneville Power Admin., was carried out in conjunction with analysis by several structural finite element computer programs. Static and dynamic properties of that tower were obtained for comparison with these properties after the conductor bundles were strung. Experience in field testing of large structures, equipment usage, and program development analysis was obtained. The static field testing of the tower and comparison of the results with those from the static computer analysis provided some significant information. The tower does respond in a linear, elastic manner, with computer predictions of tower displacements being very close to those measured. Very little movement of the footings was observed during the static testing. Attempts to record strain gage information were not successful. The dynamic field testing of the tower also provided some significant information. Comparison of the dynamic computer analysis with values obtained by testing were within 9%. Foundation motion may account for the anomaly. The fundamental frequency of vibration was found to be 2.2 Hz, and the damping was quite low at 0.3% of critical.

• Research Organization: Bonneville Power Administration, Portland, OR (USA)
• OSTI ID: 6799618
• Report Number(s): ME-76-1
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
POWER TRANSMISSION TOWERS
DYNAMIC LOADS
STATIC LOADS
EXPERIMENTAL DATA
FINITE ELEMENT METHOD
MECHANICAL TESTS
MECHANICAL VIBRATIONS
THEORETICAL DATA
DATA
INFORMATION
MATERIALS TESTING
MECHANICAL STRUCTURES
NUMERICAL DATA
NUMERICAL SOLUTION
TESTING
Towers
Electric lines
420200* - Engineering- Facilities
Equipment
& Techniques