DAMPING SEISMIC VIBRATIONS IN HIGH-RISE BUILDINGS USING CONTROLLED REACTIVE DAMPERS

Introduction. The paper investigates the dependence of seismic displacements of high-rise buildings on the control parameters of a reactive damper (vibration absorber). A frequency-vector analysis of a building’s finite element model is performed. The building’s response to non-stationary seismic loads is analyzed with respect to changes in damper parameters: the specified control displacement, the ejection velocity of the reactive jet, and the duration of a single reactive impulse. An algorithm for optimizing the controlled damper parameters is presented. The effectiveness of using a reactive damper to reduce the amplitude of oscillations in a high-rise building is evaluated. Reactive vibration dampers are installed at either one or two levels along the building’s height. Methods. A mathematical model of the “high-rise building – reactive damper” system under non-stationary (seismic) loading was studied using a software suite based on the finite element method (FEM). The dynamic response of the structure was determined by numerically solving the system of differential equations of motion using Newmark’s step-by-step method, implemented by the authors in the Matrix Laboratory envir