Response Reduction of Tall Buildings subjected to Seismic Loads by Tuned Mass Damper

Abstract

High-rise buildings are comparatively flexible with a low damping value having greater possibilities of failure and less serviceable. Failure potential can be minimized by counteracting vibrations. Methods are available to reduce the vibration of the tall buildings. One of the methods is control of vibrations using Tuned Mass Damper. The behaviour of tall buildings is analysed by considering specific time history data along with gravity loads. The structural mass required to resist the lateral loads increase exceedingly as the level of the building goes up if the stiffness of the building is not sufficient to resist the lateral forces. The main aim of the structural engineer is to provide a suitable solution for the effects due to gravity and lateral loads, by proper usage of Lateral Load
Resisting System, approximate analysis and preliminary design. In the present study, the analysis of a 25 storey structure has been done to obtain an optimum mass ratio by using passive resistance. Then by using the optimum mass ratio obtained from the analysis of 25 storey structure, the analysis of 35 and 45-stories reinforced concrete tall buildings subjected to seismic loads has been done as per the IS codes of practice. Safety of the structure has been checked against allowable limits prescribed for joint displacements, base shear, interstorey drifts by implementing Tuned Mass Dampers (TMD). The behaviour of the building for an optimum mass ratio of Tuned Mass Damper with an increase in the height of building is found out.