CHARACTERISTICS OF A SOIL-ASYMMETRIC BUILDING-ACTIVE TUNED MASS DAMPER INTERACTION SYSTEM

The dynamic equations of a soil-asymmetric structure-active tuned mass damper (ATMD) interaction system are developed by using Fourier Transformation. The parameter criteria of the ATMD are defined as minimizing the minimum values of the maximum displacement dynamic magnification factors (DMF) of the asymmetric structure with the ATMD. The effectiveness criteria of the ATMD are selected as the ratios of the minimization of the minimum values of the maximum displacement DMF of the asymmetric structure with the ATMD to the maximum displacement DMF of the asymmetric structure without the ATMD. Employing the criteria defined above, the parametric studies on the influences of the normalized eccentricity ratio (NER), torsional to translational frequency ratio (TTFR), stiffness ratio of soil relative to structure (SRSS), and height-to-base ratio (HBR) of the soil-asymmetric structure interaction system on the optimum parameters and effectiveness of the ATMD are then carried out. Through numerical analysis, the suggestions obtained herein are useful for the design and implementation in earthquake reduction of asymmetric structures built on soft soil foundation.