International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 11 Issue: 05 | May 2024
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p-ISSN: 2395-0072
A Review on SEISMIC PERFORMANCE OF SOFT STOREY BUILDING WITH DAMPERS Trishir Patel1, Milli Shakhla2 1M. Tech Student, L.J. University Ahmedabad
2Millie Shakhla, Assistance Professor, Civil Engineering Department, L.J. University, Ahmedabad, India
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Abstract - Soft floors or open floors are a common feature
purpose of seismic analysis is to ensure that the structure behaves satisfactorily under earthquake loads. A seismic damper is a mechanical device that dissipates the kinetic energy of seismic waves traveling through a building or other structure. Seismic dampers reduce vibrations in structures during earthquakes. Damper reduces the deformation of the structure and increases the strength of the structure. Seismic dampers used in tall buildings are adhesive dampers, viscoelastic dampers, friction dampers, vibration dampers, tuned mass dampers, performance dampers, and magnetic dampers.
in modern high-rise buildings in urban India. Such features are not very attractive in buildings built in seismically active areas; It has been confirmed in many strong shaking experiences in past earthquakes. Although open (soft) firstfloor high-rise buildings are at risk of collapse due to earthquakes, their construction is still common in developing countries such as India. A soft floor may be aesthetically or commercially desirable, which means there are fewer opportunities to install an earthquake resistance system. For the current study, the symmetrical flexible story structure in the plan was modeled and analyzed using Etabs software. Static and dynamic analysis methods are adopted to analyze the structure. The structure is provided with attached dampers to control the seismic impact and increase the strength of the structure. The composite damper structure was modeled and analyzed with the same parameters using Etabs software. The results obtained in displacement, story drift and main shear are compared. Key Words: Structures, Analysis, Seismic Response, Earthquake, Viscous Damper, Wind Analysis, Etabs, Staad Pro
1.INTRODUCTION Parking has become an unavoidable feature of most high-rise buildings in the city. The first floor of the building is usually open without walls to facilitate parking. Soft-rise buildings are high-rise buildings with wide openings, open to commercial spaces or parking, meaning that the first-floor columns do not have partition walls (construction or RC) in between. A soft floor as per IS-1893: 2016 (Part I) is a soft floor having less than 70% of the upper layer or less than 80% of the average lateral strength of the three upper layers. In a very soft layer, the lateral stiffness is less than 60% of the upper layer or less than 70% of the average stiffness of the three layers above. The main loads that affect tall buildings are gravity (dead and live loads), dynamic loads (earthquakes, wind, explosions, collisions, etc.), snow loads. Among these dead loads, earthquake and wind loads are the most important loads that govern building design. Wind loads can be divided into static and dynamic loads depending on time. Earthquake motion causes horizontal and vertical seismic loads on structures. These horizontal forces create axial forces, bending moments, torsional moments and shear forces in structural members. The
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Figure 1: Behaviour of soft storey building as inverted pendulum
1.1 Objective
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Among different structural systems, dampers are the most effective for designing buildings, so the purpose of this project is to study the seismic response of buildings with dampers installed at different levels of soft layers.
Investigate the effect of dampers to improve the seismic performance of soft-story buildings.
Comparative study of various seismic parameters such as base shear for solid layer shear, layer shear, undamped and damper.
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