NEHRP Clearinghouse

Active Bracing System: A Full Scale Implementation of Active Control.
Reinhorn, A. M.; Soong, T. T.; Lin, R. C.; Riley, M. A.; Wang, Y. P.
National Science Foundation, Washington, DC., August 14, 1992, 113 p.
Identifying Number(s)
An active bracing system has been designed, fabricated, and installed in a full-scale dedicated test structure for structural response control under seismic loads. The report presents (1) a description of the constructed system, (2) design specifications for the control system along with simulation studies for the design earthquake, and (3) observed performance of the system under three actual earthquakes and other artificial loadings. Detailed design and analysis of the active system are carried out with respect to hardware development, control force constraints, and power and energy requirements. It is shown that a full-scale efficient active structural control system can be developed within limits of current technology. Simulation results provide information on performance bounds that can be expected of active systems in structural control under seismic loads and under constraints imposed by practical considerations. Installation details of the system in the building structure are presented along with the selections for fail-safe shutdown operations in case of malfunctions. Also presented are the procedures for proper maintenance and self testing which ensure continuous control with minimal resources. The observed performance under artificial loadings and actual ground motions is compared with the estimated analytical response.
; Braces; Dynamic response; Buildings; Earthquake resistance; Earthquake resistant structures; Specifications; Loads (Forces); Earthquake engineering; Structural vibration; Earthquakes; Seismic effects; Active control; Mathematical models; Servomechanisms; Algorithms; Actuators; Bracing