OPTIMIZATION OF VISCOUS DAMPER PROPERTIES IN R.C.C. FRAME STRUCTURE

Abstract

Conventionally, the structures are designed to resist dynamic forces through the combination of strength,
deformability and the energy absorption. These structures deform well beyond elastic limit in a severe earthquake. The extent
of damage the earthquake may cause to the structure may depend on severity of the earthquake, distance from the epicenter
and many other factors. The damage can be reduced by proper analysis and design of the structure. To avoid the damage of
the structure due to conventional ductility based design, Structural engineers are working to figure out different alternative
systems that could be robust and can withstand strong motions. Energy dissipation devices is one of the system that work by
absorbing or reflecting a portion of the input energy that would otherwise be transmitted to the structure itself and would
damage the structure. In such situations structural control techniques are more promising for earthquake resistant design.
The concept of these techniques is to absorb the vibration energy of the structure and hence reduce the stresses in the
structure. Fluid Viscous Dampers when used in the structure in high seismic areas, reduces the vibration, displacement and
the stresses induced by both the wind and the earthquakes. In the present study the effectiveness of the fluid viscous damper
in reducing the stresses and the deflections in a structure in a seismic event is evaluated analytically for a 6 story structure
which is symmetrical in plan, modelled and analyzed using E-tabs 2016 software. The earthquake loads are defined as per IS
1893-2016 (part 1). To analyze the structure static and dynamic methods are adopted. Non Linear time history analysis is
done to obtain the real time deflections and stresses in the actual structure. The results show the procedure that how the
values of the damping coefficient and the effective stiffness of the brace damper can be arrived at in the E-tabs software. This
is could be done by the iterative process.