International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 12 Issue: 05 | May 2025
p-ISSN: 2395-0072
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STUDY ON BEHAVIOR OF SEISMIC EVALUATION OF MULTI STORIED BUILDING WITH FLOATING COLUMN HEMAVATHI G1, Dr. L. GOVINDARAJU2 1PG Student, Department Of Civil Engineering, UVCE, Jnanabahrathi Campus, Bengaluru, Karnataka, India 2Professor, Department Of Civil Engineering, UVCE, Jnanabahrathi Campus, Bengaluru, Karnataka, India
---------------------------------------------------------------------***--------------------------------------------------------------------such as design and construction complexity, safety and Abstract - Multistoried buildings are complex structures that
security concerns, and sustainability and environmental impact. By understanding the characteristics and challenges of multistoried buildings, architects, engineers, and builders can create structures that meet the needs of occupants while ensuring safety, sustainability, and functionality.
require careful consideration of various factors, including seismic activity, to ensure their stability and safety. These buildings, which can be used for residential, commercial, or industrial purposes, are particularly vulnerable to seismic forces due to their height and weight. This study investigates the seismic behavior of multistoried buildings (G+10 and G+20) with and without floating columns, situated in seismic zones IV and V with soft soil conditions. Various seismic analyses, including equivalent static analysis, response spectrum analysis, modal analysis, time history analysis, and pushover analysis, were performed using ETABS and SAP2000 software. The results show that structures with floating columns exhibit maximum storey displacement and drift, although both structures satisfy code recommendations. The provision of steel inverted V bracings significantly improves the seismic performance, bringing both structures within the life safety state. Soil-structure interaction analysis further highlights the importance of considering the interaction between the structure and the soil, with surface springs and steel bracings ensuring the structure's stability. This study concludes that multistoried buildings with and without floating columns can be made safe with the provision of steel inverted V bracings, and emphasizes the importance of careful seismic design and analysis for these complex structures.
1.1 Floating column The term "floating column" refers to a vertical element that rests on a beam, which is a horizontal member, at its lower level. A column is intended to be a vertical member that begins at foundation level and transfers the load to the ground. When a column from the top of the building is stopped at a lower level, typically at the ground story, it creates a common type of discontinuity in the load path in moment frames. In these situations, loads from the overhanging sections divert and reach the closest column that remains continuous all the way to the foundation. This increases the strain on the ground floor columns and may result in their failure.
1.2 Bracings A braced frame is a structural system frequently employed in buildings that experience lateral forces, such as wind and seismic activity. Typically constructed from structural steel, the members of a braced frame are capable of efficiently handling both tension and compression. This type of construction is widely utilized due to its cost-effectiveness and straight forward analysis. The economic advantage is derived from the pinned connections between beams and columns. Bracing, which enhances stability and counteracts lateral forces, can consist of diagonal steel members or a concrete core. In braced structures, beams and columns are designed solely for vertical loads, with the bracing system responsible for managing all lateral forces. The beams and columns support vertical loads, while the bracing systems address lateral loads. In the current study, during pushover analysis, the structure is subjected to potential collapse. To mitigate this risk, inverted V bracings are implemented.
Key Words: Multistoried Buildings, Floating Column, Seismic Zones, Steel Inverted V Bracings, Equivalent Static Analysis, Response Spectrum Analysis, Pushover Analysis, Soil-Structure Interaction, Structural Stability.
1. INTRODUCTION Multistoried buildings are complex structures that consist of multiple levels or floors, designed to accommodate various activities such as residential, commercial, or industrial uses. These buildings are a crucial part of modern urban landscapes, providing space for living, working, and other activities. The concept of multistoried buildings has evolved significantly over time, driven by advances in materials, engineering, and architectural design. The design of multistoried buildings requires careful consideration of structural integrity, safety, and functionality, including the choice of structural system, load-bearing capacity, and safety features. Multistoried buildings offer several benefits, including space optimization, increased density, and economic benefits. However, they also present challenges
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