Experimental Study of Seismic Behaviour of Multi-Storied Framed Structure Connected with Viscous Fluid Dampers and Lumped Masses

Current trends in construction industry demand staller 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. The dynamic response of building structures due to earthquakes is very important to Civil engineers. Structures expose to earthquake excited vibrations are damaging to their structures components. Vibration control is having its ischolar_mains primarily in aerospace related problems such as tracking and pointing, and in flexible space structures, the technology quickly moved into civil engineering and infrastructure-related issues, such as the protection of buildings and bridges from extreme loads of earthquakes and winds. The number of tall buildings being built is increasing day by day. Today we cannot have a count of number of low-rise or medium rise and high rise buildings existing in the world. Mostly these structures are having low natural damping. So increasing damping capacity of a structural system, or considering the need for other mechanical means to increase the damping capacity of a building, has become increasingly common in the new generation of tall and super tall buildings. But, it should be made a routine design practice to design the damping capacity into a structural system while designing the structural system. Now-a-days several techniques are available to minimize the vibration of the structure. The aim of the present work is to study the effect of Viscous Fluid damper and Lumped Masses on the dynamic response of multi-stored frame structures under earthquake excitations and the seismic response of frame structure model(one bay and three storied) for frequency, Amplification factor and lateral forces at different floor along X and Y direction for following cases (Experimental analysis).

a) Analysis without damper and without lumped mass applied to the model

b) Analysis without damper and with lumped mass and

c) Analysis without lumped mass and with damper.

And the comparative study is made for above three conditions. The investigation is also carried out for effectiveness of the damping in terms of the percentage reduction in force of second & third floor with respect to first floor when dampers are connected diagonally.