A COMPARATIVE STUDY ON PERFORMANCE OF TALL STRUCTURAL SYSTEMS FOR SEISMIC AND WIND LOADS
Keywords:
Tall buildings, ETABS 2016, Response spectrum analysis, Wind load analysis, Tube structures, Diagrid structure, Outrigger with belt truss.Abstract
This paper investigates the performance of G+55 storeyed tall structures with different lateral load resisting systems for seismic and wind loads using ETABS 2016 (Version 16.2.1) software. Different lateral load resisting systems viz. Conventional moment resisting frame, Framed tube, Tube in tube, Bundled tube, Outrigger with belt truss, Diagrid and Braced tube are considered for the analysis. Seismic parameters such as storey displacement, storey drift ratio, storey shear, storey stiffness and time period are captured using Response Spectrum Analysis for seismic zone III (Moderate : Mumbai) considering IS 1893–Part 1 (2002) codal provisions. Further, Lateral displacements due to Wind Load Analysis are also determined as per IS 875– Part 3 (2015) codal provision considering a wind speed of 44 m/s for Mumbai city. For the considered plan, properties, dimensions of components and number of stories, all the tall structure models except Diagrid system resist the earthquake and wind loads safely. However, the tube tall structural systems viz. Framed tube, Tube in tube, Bundled tube and Braced tube are more efficient from the point of view of least displacement, least drift ratios and high stiffness, thus making them more stable than the other considered tall structural systems.
