Water Tank as Passive TMD for Seismically Excited Structures

This paper presents analytical investigation carried out to study the feasibility ofimplementing water tank as passive TMD using ANSYS. Two multi-storey concretestructures, three and five storey were taken for the study. The water tank was placed at the roof. The mass and frequency of the tank including its water, walls, roof, beams andcolumns were tuned to the optimized values. The behavior of the tank subjected to fourearthquake data, namely, El-centro, Hachinohe, Kobe and Northridge was studied under five conditions, namely tank empty, 1/4th water, 1/2th water, 3/4th water and full tank. The results show if the tank is tuned properly it can reduce the peak response of structures subjected to seismic forces.