International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 04 Issue: 07 | July -2017
p-ISSN: 2395-0072
www.irjet.net
VIBRATION ANALYSIS OF STRUCTURE USING TUNE MASS DAMPER Mr. Khemraj S. Deore1, Prof. Dr. Rajashekhar S. Talikoti2, Prof. Kanhaiya K. Tolani3 1M.E.
(Structure) Student, Late G.N. Sapkal College of Engineering, Nashik,Maharashtra, India of Department, Sandip Institute of Engineering & Reaserch Center, Nashik, Maharshtra, India 3Associate Professor, Late G.N. Sapkal College of Engineering, Nashik, Maharashtra, India ---------------------------------------------------------------------***--------------------------------------------------------------------1.1 Tuned Mass Damper Abstract - Current trends in construction industry demands 2Head
taller and lighter structures, which are also more flexible and having quite low damping value. This increases failure possibilities and also problems from serviceability point of view. Now-a-days several techniques are available to minimize the vibration of the structure, out of the several techniques available for vibration control , concept of using TMD is a newer one. This study has made to study the effectiveness of using TMD for controlling vibration of structure. At first practical plan model with and without TMD has prepared. And perform Response Spectrum Analysis. In which calculate Maximum Deflection, Storey Drift, Base shear, Natural Frequency and Fundamental period of building. From the study it was found that, TMD can be effectively used for vibration control of structures. TMD was more effective when it is attached at the top floor of building. TMD results in gradual decrement in the displacement, storey drift and fundamental period of the structure. Key Words: TMD, Response Spectrum Analysis, Story Displacement, Story Drift, Base Shear, ETABS.
1. INTRODUCTION An earthquake is a natural phenomenon associated with violent shaking of the ground. They are vibrations of the earth’s surface caused by sudden movements of earth crust mostly due to tectonic movements. Since earthquake forces area unit random in nature and unpredictable, the engineering tools must be sharpened for analyzing structures below the action of those forces. Time History Analysis and Response Spectrum Analysis is a vital technique for structural seismic analysis particularly once the structural is high rise. This thesis study of the damper effect in the frame (MRF) is an important factor for the analysis. For Analysis purpose practical (G+16) storey building modelled with and without tuned mass damper by using software ETABS. Constant loading parameters are used for both cases. Load combinations are taken from IS code 875 Part 5. A tuned mass damper (TMD) is placed on top floor of building and Response spectrum analysis has performed. The result obtained from software analysis of building with and without tuned mass damper are compare with each other.
Š 2017, IRJET
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Impact Factor value: 5.181
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It is also known as as passive mass damper (PMD) or harmonic absorber. It is a device mounted in structures to reduce the amplitude of mechanical vibrations. Their application can prevent discomfort, damage, or outright structural failure.
Fig -1 : Basic Principle of TMD It is a passive damping system. Utilizes a secondary mass attached to a main structure through spring and dashpot. Secondary mass system has a natural frequency closed to the primary structure which depends on its mass and stiffness. The excess energy that is built up in the structure can be transferred to a secondary mass and is dissipated by the TMD. By specifying the mass ratio of the secondary mass to the primary body, the optimum frequency ratio between the two masses and the optimum damping ratio of the secondary mass can be obtained. This secondary mass can be made of any material such as concrete or steel, while damping is generally provided by viscous damping devices.
1.2 Response spectrum Analysis A response spectrum is simply a plot of the peak or steady-state response (displacement, velocity or acceleration) of a series of oscillators of varying natural frequency, that are forced into motion by the same base vibration or shock. The resulting plot can then be used to pick off the response of any linear system, given its natural frequency of oscillation. One such use is in assessing the peak response of buildings to earthquakes. The science of strong ground motion may use some values from the ground response spectrum (calculated from recordings of surface ground motion from seismographs) for correlation with seismic damage. If the input used in calculating a response spectrum is steady-state periodic, then the steady-state ISO 9001:2008 Certified Journal
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