International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 11 Issue: 07 | July 2024
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p-ISSN: 2395-0072
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 - Open floors, also known as soft floors, are a
In structural members, these horizontal forces result in axial forces, bending moments, torsional moments, and shear forces. Seismic analysis is used to make sure a structure responds appropriately to seismic loads.
typical feature of contemporary high-rise structures in urban India. These elements are not particularly appealing in structures constructed in seismically active regions; numerous instances of intense shaking during previous earthquakes have attested to this. Open (soft) first-floor high-rise structures are nevertheless frequently built in developing nations like India, despite the fact that they are vulnerable to collapse from earthquakes. There are fewer chances to build an earthquake resistant system when there is a soft floor, either for aesthetic or business reasons. Etabs software was used to develop and analyze the plan's symmetrical flexible story structure for the current study. The structure is analyzed using both static and dynamic analytic techniques. Attached dampers are used on the structure to reduce seismic energy and boost structural integrity. Using Etabs software, the composite damper structure was modeled and assessed using the same parameters. A comparison is made between the displacement, story drift, and main shear data.
1.1 Dampers An apparatus that distributes the kinetic energy of seismic waves passing through a building or other structure is called a seismic damper. During earthquakes, seismic dampers lessen the vibrations in buildings. Dampers improve the structure's strength and lessen its tendency to distort. Adhesive, viscoelastic, friction, vibration, tuned mass, performance, and magnetic dampers are some of the seismic dampers utilized in tall buildings. Types of Dampers: 1) 2) 3) 4) 5) 6)
Key Words: Structures, Analysis, Seismic Response, Earthquake, Viscous Damper, Wind Analysis, Etabs, Staad Pro
Viscous Dampers Viscoelastic Dampers Friction Dampers Tuned Mass Dampers Yielding Dampers Magnetic Dampers
1.INTRODUCTION In the metropolis, parking has become an essential aspect of the majority of high-rise structures. In order to make parking easier, the building's first level is often open and wall-free. High-rise structures known as "soft-rises" contain large apertures that allow for parking or commercial spaces. This means that there are no partition walls (RC or construction) between the first-floor columns. According to IS-1893: 2016 (Part I), a soft floor is defined as one that has less than 80% of the average lateral strength of the three above levels or less than 70% of the upper layer. Less than 60% of the upper layer or less than 70% of the average stiffness of the three layers above characterize a very soft layer's lateral stiffness. Tall buildings are primarily affected by three types of loads: snow loads, dynamic loads (such as earthquakes, wind, explosions, collisions, etc.), and gravity (both live and dead loads). The two dead loads that most significantly influence building design are earthquake and wind loads. Depending on the time, wind loads can be separated into static and dynamic loads. Seismic loads on structures are caused by both horizontal and vertical earthquake motion.
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Figure 1: Seismic Dampers in Building
1.2 Objective ●
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The goal of this project is to investigate the seismic response of structures with dampers installed at various levels of soft layers since dampers are the most efficient structural system for building design. Examine the impact of dampers in order to enhance soft-story structures' seismic performance.
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