International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 10 | Oct 2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 755 Study of Combined Action of Coupled Tuned Liquid and Mass Damper on Earthquake Response of Buildings Nikhil V Jacob 1 , Minsu Mariyam Varkey 2 , Jesmi Michael 3 , Nithin M Reji 4 , Er. Vivek Philip 5 Er. Ancy Mathew 6 1,2,3,4 B.Tech Civil Engineering Student, Dept of Civil Engineering, Saintgits College of Engineering , Kottayam, Kerala, India 5,6 Assistant Professor, Dept of Civil Engineering, Saintgits College of Engineering, Kottayam, Kerala, India. -------------------------------------------------------------------------***------------------------------------------------------------------------ Abstract - The need to build flexible and slender buildings that have relatively low damping properties has attracted engineers attention to look for efficient and economical techniques to control the vibration response of structures. Recently dampers have become more popular for vibration control of structures, because of their safe, effective and economical design. Combination of Tuned Liquid Damper and Tuned Mass damper, as a unit, is a passive damping device that consists of movable tanks filled with liquid to suppress the horizontal vibration of structures. The tank is designed so that the liquid surface wave has frequency tuned to the fundamental frequency of the building. The structure was first modelled and then its fundamental natural frequency was found out by carrying out free vibration analysis. This unit is then modelled into the structure and changes in natural frequencies were monitored. The structure was subjected to an earthquake loading and its frequency response was compared without this unit and with it. Based on the optimum mass ratio obtained, number of TLD tanks, its dimensions and required water depth for the structure to control vibrations was proposed. Increasing the mass ratio of the damper can improve the damping effects; under the condition of tuning frequency, the damping effects are remarkable. However, the more the deviation from the tuned frequency, the less controlling effects can be obtained. Keywords: Tuned Liquid Dampers; Eigen Value Analysis; Response Spectrum Analysis; Fluid Structure Interaction 1. INTRODUCTION Earthquake is one of the major natural disasters which occur due to the shaking of the ground caused by movement of the tectonic plates relative to each other. A large population lives in regions of seismic hazards, at risk from earthquakes of varying severity and frequency of occurrence. Geographical data of India shows that almost 54% of the land is susceptible to earthquakes. This natural calamity can take millions of life and can cause significant damage to structures. Hence the concept of earthquake resistant design of structures has been largely discussed over the past few decades. Several seismic construction designs and technologies have been developed over the years in efforts to reduce the effect of earthquakes on structures. Tuned mass damper and tuned liquid damper are relatively new and growing technology of this kind. In this research we study the combined action of tuned liquid and mass damper. In the present scenario it is very important to have high rise building due to increase in population. The past experience in earthquake shows that the building without damper is more prone to earthquake. This can be reduced by the installation of damper unit in the structure. 1.1 NEED FOR PRESENT STUDY The following observations were made from literature survey: i. Several studies have focused on evaluating the response of high rise building with and without dampers. However there is a lack of understanding of the seismic response of structures with combined dampers. Therefore evaluation of the effect of buildings is greatly needed. ii. Most of the research studies were conducted for tank which requires larger length for sloshing action. So study for reducing this length without affecting its damping action is necessary 1.2 OBJECTIVES The prime requirements of earthquake resistant multi- storied structural buildings are to have safety and minimum damage level to the structure. In order to meet these requirements, the structure should have adequate lateral strength, stiffness and ductility. The main objectives of the current work are as follows:  To experimentally investigate the effectiveness of combined TLD-TMD damping action by free vibration analysis of simple building model.  To evaluate the effectiveness of damper on a multi- storied building equipped with TLD-TMD unit. 2. EXPERIMENTAL STUDIES A series of experiments were conducted to study the dynamic behaviour of a structure when subjected to free vibration with TLD-TMD unit placed by connecting accelerometers. Vibration is the movement or mechanical