Behaviour of RC building with outrigger system subjected to earthquake and wind effect
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Date
2019-09
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The outrigger and belt truss system is commonly used as one of the structural system to effectively control the excessive drift due to lateral load, so that at the time of small or medium lateral load due to either wind or earthquake load, the risk of structural and non-structural damage can be minimized. For high-rise buildings, particularly in seismic active zone or wind load dominant, this system can be chosen as an appropriate structure. This paper studies the use of outrigger and belt truss system for high-rise concrete building subjected to wind or earthquake load. In this thesis 50, 55 and 60 storey two dimensional models of outrigger and are subjected to wind load. For the two dimensional 50 storey model, 65% maximum displacement reduction can be achieved by providing first outrigger at the top and second outrigger at the middle of the structure height. For the two dimensional 60 storey structural model subjected to the earthquake load, about 18 % reduction in maximum displacement can be achieved with optimum location of the outrigger truss placed at the top and the 33rd level. It has been observed that the maximum reaction has been generated in the soil type III (Soft soil) for all three structures (G+50, G+55 & G+60). It can be concluded after reviewing the values in table of base shear that Gust Factor load case governs the analysis as well as design for the soil type I (Hard Soil). The base shear generated by the Gust Factor load case is maximum among all the load cases in soil type I. It is safer to build tall structure on the soil type I (hard soil) rather than soil type II, (medium soil) and soil type III (soft soil).
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