International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 11 Issue: 02 | Feb 2024
p-ISSN: 2395-0072
www.irjet.net
EVALUATION OF DYNAMIC RESPONSE OF RC BUILDING WITH DIFFERENT BASE ISOLATORS Revuri Priyanka1, Prasad Gowda C2 1PG student, Dept. of civil engineering, BIT, Karnataka, India 2Assistant professor, Dept. of civil engineering, BIT, Karnataka, India ---------------------------------------------------------------------***--------------------------------------------------------------------of seismic waves through the structure is the aim of base Abstract- Earthquake, characterized by the rapid release of
isolation. Seismic dampers are unique equipment that are put in the structure to take in the energy offered to it by the earth motion. They work similarly to springs in cars, which absorb shocks generated by shifting roads.
energy in the earth’s lithosphere, poses a significant threat to buildings and infrastructure. To mitigate earthquake effects on buildings, seismic design methods such as seismic dampers and base isolation devices are used. Base isolation, in particular, is examined as a strategy to separate structures from the ground motion, thus safeguarding them from destructive consequences. This study explores the influence of different types of base isolators and their impact in minimizing seismic effects on structures and, emphasizing the advantages over the conventional structures. In the present research a numerical investigation on RC buildings with different base isolators using finite element analysis. Parameters such as storey displacement, storey shear, time period and storey drift are analyzed and compared. The findings reveal that base isolation significantly extends the structure’s duration, reducing base shear values. Rubber isolators emerge as a preferred choice in terms of seismic performance
1.2 BASE ISOLATION The fundamental idea behind base isolation is to introduce a support that isolates the structure from the shaking ground to be able to protect it from the destructive consequences of an earthquake. In the strictest sense, the foundations are severed from the structure (whether it a building, a bridge, or a piece of machinery). Because the ground shakes during an earthquake, the structure sustains the majority of the damage. In other words, the idea is to keep the building stationary while separating it from the earth so that it can move. Base isolation is a design idea that has been used more frequently recently for buildings and bridges, especially for those in need to continue operating normally in the event of a big earthquake, such as hospitals, fire stations, and emergency command centers. This approach has been applied to construct many different kinds of structures, and plenty others are now being designed or built.
Key Words: Earthquake, Base isolators, time history analysis, storey shear, storey displacement, time period.
1. INTRODUCTION An earthquake is the shaking of the Earth's surface caused by a rapid release of energy in the Earth's lithosphere, which generates seismic waves. It is also referred to as a quake, tremor, or temblor. Earthquakes can range in strength from those that are so little that no one can feel them to those that are powerful enough to throw things and people into the air, destroy vital infrastructure, and devastate entire cities. The number, kind, and size of earthquakes that occur in a region during a specific period of time is known as its seismic activity.
1.1 REDUCTION OF EARTHQUAKE EFFECTS ON BUILDINGS: While the goal of conventional seismic design is to build structures that can endure strong earthquake shaking without collapsing, certain structural elements and nonstructural elements (such glass facades) may sustain damage. There are two fundamental methods employed to protect structures against the damaging effects of earthquakes. These are devices for base isolation and seismic damping. Removing the structure from the ground in a way that reduces, if not totally eradicates the propagation
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Impact Factor value: 8.226
Fig 1: Deflection of a structure after and before base isolation.
1.2 ISOLATOR TYPES
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Elastomeric (Rubber) bearings Laminated rubber bearing sliding system Friction pendulum system (FPS)
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