Accession Number : ADA194190

Title :   Vibration Test of Richard B. Russell Concrete Dam after Reservior Impoundment.

Descriptive Note : Final rept. Sep 81-Sep 85,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB

Personal Author(s) : Bevins, Tommy L. ; Chiarito, Vincent P. ; Hall, Robert L.

Report Date : MAR 1988

Pagination or Media Count : 63

Abstract : The recently completed Richard B. Russell Dam, is approx 170 miles from the mouth of the Savannah River. The crest of the concrete gravity dam, 1,884 ft long, is composed of 13 nonoverflow, 8 intake, and 11 spillway monoliths, the tallest of which is approximately 200 feet high. To experimentally determine the dynamic properties of the dam with and without hydrodynamic interactions, forced vibration tests were conducted before and after reservoir impoundment. The average reservoir elevation during the test following reservoir impoundment was 470 feet-- an increase of 127 feet above the upstream elevation during the first test. The structure was excited at three locations by a crest-mounted 17,000-lb inertial mass driven by an electrohydraulic servo-controlled actuator. The force input was computed as the product of the measured acceleration and the mass. Servo accelerometers with sensitivities ranging from 0.25 to 5.0 V/g were used to measure the horizontal motion of all 32 monoliths and the distributions of horizontal acceleration with elevation in the three drive-point monoliths, Dynamic pressures at the dam-reservoir interface were measured at the upstream face of the tallest nonoverflow monolith. The natural frequencies, damping estimates, and mode shapes were determined.

Descriptors :   *DAMS, *VIBRATION, *DAMPING, DYNAMIC PRESSURE, ACCELERATION, STRUCTURAL RESPONSE, MASS, INTERFACES, RESERVOIRS, ELEVATION, RESONANT FREQUENCY, MOTION, HORIZONTAL ORIENTATION.

Subject Categories : Civil Engineering
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE