Evaluation of Response Reduction Factor for Steel Building Using Various Types of Bracings
The IUP Journal of Structural
Ajinkya S Akolkar and Keshav K Sangle
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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.
Earthquakes may happen in any part of the world, but they are most frequent and generally more violent in two great belts of the earth, of which one almost encircles the Pacific Ocean and the other stretches across Southern Asia into the Mediterranean region. Duration of earthquake is usually rather short, lasting from a few seconds to more than a minute or so. But thousands of people lose their lives due to earthquakes in different parts of the world. Building collapse and damages are the major consequences due to earthquake ground motion.
A structure’s response to an earthquake primarily depends upon its location in the affected region, its orientation relative to the direction of most violent motion of the earth, its natural period of vibration, its damping characteristics, the physical properties of the structural material and the nature of foundation it supports.