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CONFERENCE PROCEEDINGS
6th INTERNATIONAL CONFERENCE
CONTEMPORARY ACHIEVEMENTS IN CIVIL ENGINEERING 2018 , 2018.y., pp. 125-131


VIBRATION ABSORBER OF SEISMIC ACTIONS IN BUILDINGS
 
DOI: 10.14415/konferencijaGFS2018.010
UDC: 534.28:519.6
CC-BY-SA 4.0 license
Author : Cvetićanin, Livija; Rakarić, Zvonko; Zuković, Miodrag
 
 Summary:
 Various mthods for elimination vibrations cased by seismic perturbation are developed. Beside the passive vibration absorbers significant number of active vibration absorbers are suggested. Unfortunately, these are extremely expensive due to the fact that they work randomly but their maintance has to be continual. It gives the priority to development of passive absorbers. In this paper we suggest a new type of nonlinear absorber based on the piano-wire vibration concept. The absorber is connected to the floor element. It contains a straightforward translatory moving mass settled on a steel wire installed in the direction perpendicular to slider motion. Due to slider motion in the wire a restoring force occurs. The force is a nonlinear deflection function. Using the principle of elimination of building motion, parameter of nonlinearity is computed. The model of the system are two coupled second order nonlinear differential equations. The nonlinearity is of cubic order. Based on the exact steady state solution that corresponds to nonlinear resonant vibration, we developed an approximate solving method for the perturbed equations. Finally, the conditions for vibration elimination are computed.
 
 Keywords:
 Passive absorber, piano-wire concept, nonlinear resonant vibration, Jacobi elliptic function