A Comparative Study on Behaviour of Multistoried Building with Different Types and Arrangements of Bracing Systems

Author(s):

K.S.K.Karthik Reddy , ANDHRA UNIVERSITY; Sai Kala Kondepudi, ANDHRA UNIVERSITY; Harsha Kaviti, ANDHRA UNIVERSITY

Keywords:

High rise buildings, Bracings, Storey drift, Base shear,Nodal displacemnts

Abstract:

When a tall building is subjected to lateral or torsional deflections under the action of lateral loads, the resulting oscillatory movement can induce a wide range of responses in the building. As a result, lateral stiffness is a major consideration in the design of tall buildings. Bracing is a highly efficient and economical method of resisting lateral forces in a frame structure because the diagonals work in axial stress and therefore call for minimum member sizes in providing the stiffness and strength against horizontal shear. In this research study, four different types of bracing systems have been investigated for the use in tall building in order to provide lateral stiffness. The use of bracings has potential advantage over other scheme, the bracings are provided for peripheral columns. A sixteen story (G+15) building is situated at seismic zone 2 and is subjected to a wind speed of 220kmph. The building models are analyse by equivalent static analysis as per IS 1983:2002 using Staad ProV8i software and wind loads are calculated as per IS:875(part 3)-1987. The main parameters consider in this paper to compare the seismic analysis of buildings are lateral displacement, story drift, axial force, base shear. It is found that the x-type of bracings significantly contributes to the structural stiffness and reduces the maximum inter storey drift of R.C.C building than other bracing system. The peripheral column moments are also reduced as compared to the column moments to unbraced structure. The axial force on the columns for x king of bracings and minimum for system without any bracing similarly the base shear is more compared to any type of bracings. A comparative study between behaviour of concrete and steel bracings was also done performance of steel x bracing was 2.15% more efficient than that of reinforced concrete bracing, the complete weight of the structure was increased by 3.5% on using concrete bracings.

Other Details:

Manuscript Id	:	IJSTEV2I2051
Published in	:	Volume : 2, Issue : 2
Publication Date	:	01/09/2015
Page(s)	:	135-149

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