Nonlinear behaviour of reinforced concrete moment resisting frame with steel brace
Birendra Kumar Bohara1,2, Prasenjit Saha2
1M. Tech in Structural Engineering Sharda University
2Department of Civil Engineering, Sharda University, India
Concentrically braced frames;
Steel braced frames;
In this study, the reinforced concrete moment-resisting concentrically braced frames (RC-MRCBFs) were used with V braced frames in new constructions. The core objective of this study is to understand the earthquake behavior of the RC-MRCBFs in steel V braced frames. The buildings were assumed to be located in Indian city and were designed by using Indian seismic code. The study also investigates the overstrength and ductility reduction factors, failure mapping and collapse mechanism to understand the seismic behavior of the capacity curve, maximum top story displacements and inter-story drift of the buildings. After studying the parametric study of the 4 to 16-story buildings with a nonlinear analysis tool it was observed that to get the effective braced frame with expected failure mechanism, ductility, the columns should be designed such that, it resists at least 50% base shear in a dual system. In conclusion, it was shown that a story yielding ∆y = 0.0024 was the limiting value obtained for RC-MRCBFs when V shape steel bracings were used. It needs some improvements in the Indian seismic codes to develop adequate seismic behaviors of RC-MRCBFs for any steel braced frames.
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