Seismic Response of Torsionally Coupled System with Semi-Active Variable Dampers

The seismic response of single-story, one-way asymmetric building with semi-active variable dampers with two-step viscous damping algorithm is investigated. The response is obtained by numerically solving the governing equations of motion. The effects of superstructure eccentricity ratio, uncoupled time period, and uncoupled torsional to lateral frequency ratio are investigated on peak responses of lateral, torsional, and edge displacements and accelerations, as well as damper forces. It is found that the semi-active dampers reduce the lateral-torsional deformations significantly and effects of torsional coupling on effectiveness of control system are more sensitive to variation of eccentricity and torsional to lateral frequency ratio.

[1]  Anil K. Chopra,et al.  Asymmetric one‐storey elastic systems with non‐linear viscous and viscoelastic dampers: Simplified analysis and supplemental damping system design , 2003 .

[2]  Faramarz Khoshnoudian,et al.  Nonlinear response of a torsionally coupled base-isolated structure , 2007 .

[3]  R. S. Jangid,et al.  SEISMIC RESPONSE OF TORSIONALLY COUPLED STRUCTURES WITH ACTIVE CONTROL DEVICE , 2001 .

[4]  Rakesh K. Goel,et al.  Effects of supplemental viscous damping on seismic response of asymmetric‐plan systems , 1998 .

[5]  S Unjoh,et al.  SEISMIC RESPONSE CONTROL OF BRIDGES BY VARIABLE DAMPERS , 1994 .

[6]  Lyan-Ywan Lu,et al.  Predictive control of seismic structures with semi‐active friction dampers , 2004 .

[7]  Chin-Hsiung Loh,et al.  Semi-active control of a torsionally-responsive structure , 2009 .

[8]  T. K. Datta,et al.  PERFORMANCE OF MULTIPLE TUNED MASS DAMPERS FOR TORSIONALLY COUPLED SYSTEM , 1997 .

[9]  R. S. Jangid,et al.  Variable dampers for earthquake protection of benchmark highway bridges , 2009 .

[10]  Juan Carlos de la Llera,et al.  Torsional balance of plan‐asymmetric structures with frictional dampers: analytical results , 2005 .

[11]  Osamu Yoshida,et al.  Experimental verification of torsional response control of asymmetric buildings using MR dampers , 2003 .

[12]  Chin-Hsiung Loh,et al.  Semi-active control of torsionally responsive structures , 2008, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.