Evaluation of Response Reduction Factor for Steel Building Using Various Types of Bracings
The IUP Journal of Structural Engineering, Vol. IX, No. 4, October 2016, pp. 7-21
Posted: 16 Nov 2017
Date Written: October 14, 2016
Abstract
The paper aims at evaluating the value of Response Reduction Factor (RRF) for 3D model of steel buildings. Nonlinear static pushover analysis was carried out to assess the structural performance of different bracing systems in steel buildings of 4, 6 and 8 storeys. Five structural configurations were used, namely, Moment Resisting Frames (MRFs), Diagonal Braced Frames (DBFs), X Braced Frames (XBFs), V Braced Frames (VBFs) and Chevron Braced Frames (CBFs). The effect of the parameters, such as the height of building and the type of bracing system, was investigated on the value of RRF. The results show that RRF decreases as the height of the building increases and also this factor is on a higher side for braced frames than unbraced frames. The paper also shows that the values of RRF prescribed by IS code are on a very safer side than the actual values obtained, thereby giving rise to uneconomical design of structures.
Keywords: Bracings, Nonlinear Static Pushover Analysis, Pushover Curves, Response Reduction Factor (RRF)
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