e-ISSN: 2582-5208 International Research Journal of Modernization in Engineering Technology and Science ( Peer-Reviewed, Open Access, Fully Refereed International Journal ) Volume:03/Issue:12/December-2021 Impact Factor- 6.752 www.irjmets.com www.irjmets.com @International Research Journal of Modernization in Engineering, Technology and Science [133] REVIEW ON – BEHAVIOUR AND EFFECTIVENESS OF OUTRIGGER SYSTEM FOR HIGH RISE SLENDER STRUCTURES Abhishek Thota *1 , Manas Rathore *2 , Ashlesha Dubey *3 *1 Research Scholar, Institute, Kalinga University, Naya Raipur, India. *2 Assistant Professor, Kalinga University, Naya Raipur, India. *3 Researcher, Kalinga University, Naya Raipur, India. ABSTRACT The several factors which made it mandatory for the nations and the world to come up with high-rise buildings. The factors such as rapidly growth in the human population in urban areas as people migrate for livelihood and safety. It’s challenging to construct a high-rise building as there are number of aspects which needs to be considered are more in it as compared to low rise building such as lateral stiffness and stability. As the height of buildings increases, its flexibility increases i.e., stiffness reduces this will subject the structures vibrations or deflection due to due to earthquake and wind forces. There are many systems available to control the deflections or vibrations, but outrigger system is considered to be the most advantageous and effective system to improve lateral stiffness and overall structural stability of high-rise slender structures. The structural steel and reinforced concrete are most commonly used for the construction of outrigger system elements. This paper is to discuss the basic concepts of different outrigger systems and then study their effectiveness on the behaviour of high-rise slender buildings through the literature review. The attempt of this study is that, the designers of high-rise structures consider the deflections, strength, stability and stiffness as an important factor that are affected by the lateral loads induced by wind and earthquake, then the stability assessment of high-rise slender building is generally assessed by the comfort of humans residing in the structure under the wind effect. The review also focuses on different approaches to locate the optimum position of outriggers in high rise buildings. Keywords: Lateral Stiffness And Stability, High-Rise Slender Structures, Outrigger System Elements. I. INTRODUCTION 1.1 Overview The outrigger concept originated with its use in boats known as Canoes. The outrigger was introduced to strengthen and prevent the boat rollover, and the concept is understood in terms of feedback mechanism. The feedback process is satisfactory, that is, when it improves the stability of the boat, gives negative feedback, as it’s a different part than the boat. Fig. 1 shows boats attached with the outriggers. This concept of outrigger present in the boat system can also be used for other systems that require stability in overturning. So, the outrigger can be used for a high-rise slender structure where the central core with the outrigger will reduce the displacement at the top and stabilize from overturning. Past many years it is recorded, outriggers are used in a very slender system as in wind-resistant boats, it can be used extensively on high-rise buildings with a narrow and slender structures that is subjected to the wind. Use of outriggers in high-rise buildings began about 50 years ago say that the first exterior building was designed by Barbacki which was 47 floors, the Place Victoria Building in Montreal Canada, which was completed in 1962. Fig. showing distribution of moments caused by moving persons in slender boats having similar outrigger system
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e-ISSN: 2582-5208 International Research Journal of Modernization in Engineering Technology and Science
( Peer-Reviewed, Open Access, Fully Refereed International Journal )