Analytical, numerical and experimental studies on the Semi-Active Friction Tendon

GARRIDO, HERNÁN; CURADELLI, OSCAR; AMBROSINI, DANIEL

Roma

Conferencia; X International Conference on Structural Dynamics, EURODYN 2017; 2017

European Association for Structural Dynamics

For controlling vibrations, a Semi-Active Friction Tendon (SAFT), which consists of a semi-active friction damper and anauxiliary spring that are linked to the structure by a cable, is studied experimentally, numerically and analytically. Two semiactivecontrol laws are implemented, one is based on velocity feedback (denoted as SQDCL) and the other is based on forcefeedback (denoted as SPCL); the passive control case is also studied for comparison. Based on the structural displacementreduction and the hysteretic behavior assessment, it is clearly demonstrated that (for SAFTs with a given pre-tension force): (1)the effectiveness of the optimized passive-control case can always be improved by using semi-active control with any of the twocontrol laws; and (2) the SPCL is more effective for large displacements, while the SQDCL is more advantageous for very smalldisplacements. Moreover, closed-form expressions for the dissipated energy are presented for the three cases under consideration,which can be used in preliminary design of SAFTs to decide between passive and semi-active control and to choose the moresuitable control law.