Optimum position of outrigger-belt system in a high-rise RCC building through pushover analysis
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ORIGINAL PAPER
Optimum position of outrigger‑belt system in a high‑rise RCC building through pushover analysis Aakash Gupta1 · Debabrata Podder1 Received: 4 May 2020 / Accepted: 12 October 2020 © Springer Nature Switzerland AG 2020
Abstract This study aims to investigate the behaviour of high-rise RCC buildings with core and outrigger-belt system, and to find the optimum position for the outrigger-belt system in that building. For this purpose, Pushover Analysis is used to capture the seismic response for the buildings of 10, 15, 20, 25, and 30 storeys with varying positions outrigger-belt system. Pushover analysis is a static procedure which uses a simplified nonlinear technique to calculate seismic structural deformations. The position of outrigger-belt arrangement changes from the first storey to top storey of the 3D building models, which gives the data regarding the behaviour of the building models with the change in position of that arrangement throughout its height. The analysis of these building models is performed in two different directions using two different load patterns in each direction. The results depict the optimum positions of the outrigger-belt system depending on lateral load patterns, the direction of loading, and the height of a building. It also shows how the optimum position of an outrigger-belt system can affect the performance of the buildings, which is measured in terms of roof displacement, storey shear, the fundamental period of vibration, base shear, and performance point of the buildings. Keywords Pushover analysis · Nonlinear static analysis · High-rise RCC building · Core and outrigger-belt system · Midas GEN
Introduction With the advancement in technology and building techniques, countries are inclining more towards high-rise buildings either to showcase themselves as a developed country or in some cases it even becomes the only solution to solve the problems of land scarcity and provide cheaper flat rates, or in countries like Egypt where the entire population lives on 4% of their terrain (Ibrahim 2007). Although to construct high-rise buildings, a lot of analysis and design work is involved. Most of these buildings are designed by performance-based design (PBD) procedure, which is predominantly based on the experience of the engineers and backed by the calculations, approximations, and tests conducted on different structural software like Midas Gen, ETABS, Staad Pro, Opensees, and other software available in the market. Even after all these efforts, it is not possible to determine * Debabrata Podder [email protected] 1
National Institute of Technology Meghalaya, Shillong, Meghalaya, India
the behaviour of a structure completely, as it is impossible to accurately assume or calculate all the loads that a structure may undergo throughout its design life. This unpredictability and uncertainty of loads is one of the reasons that factor of safety is also involved in the calculations. With the increase in the height of the structures, the influence of lateral forces
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