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Seismic performance evaluation of a proposed buckling-restrained brace for RC-MRFS

Ebanesar Arunraj, Cruze Daniel, Noroozinejad Farsangi Ehsan, Seenivasan Vinscent Sam Jebadurai, Mohammad Adil Dar, Abdul Rashid Dar, Gladston Hemalatha

Civil and Environmental Engineering Reports

2019

Vol. 29, no. 3

164--173

This paper presents a novel buckling-restrained brace (BRB) where the inner core is restrained by a concrete infilled Expanded Polystyrene Sheet (EPS) instead of the conventional concrete infilled tube section, to resist inner core buckling. It serves two purposes, firstly, the EPS is a ductile material, which is favourable in terms of seismic performance and, secondly, the outer construction material has better corrosion resistance. Thus, the life of the steel core can be prolonged. In this study, 6 BRB specimens were prepared, of which 3 BRB specimens were infilled with concrete and the remaining 3 BRB specimens with concrete and EPSs, in order to study their performance under cyclic loading. Three different core heights, all with the same core thickness, were adopted. The test results indicate that the load-carrying capacity of this novel BRB is higher than the conventional BRB. Further, the length of the steel tube also affects the strength of the seismic disaster mitigation system. Lastly, a numerical study on a single bay RC frame, with and without BRB subjected to time history analysis, was conducted to check the global performance of this novel system. It was found that the structural responses had substantially decreased.

Compare the behavior factor of the ultimate resistance of moment frame, plain and perforated steel plate shear walls, and buckling restrained brace as yielding metal damper

Ashrafi H. R., Shahbazian K., Bidmeshki S., Yaghooti S., Beiranvand P.

Advances in Science and Technology. Research Journal

2016

Vol. 10, nr 29

1--12

Steel moment frame systems, steel plate shear walls and also buckling restrained brace (BRB) are considered as the most widely used seismic resistant systems of the world. Firstly, in this research, in order to validate the finite element models, the tested sample of steel plate shear walls of 4 floors at the University of Alberta, Canada, and the tested sample of buckling restrained brace at the University of Berkeley California, with the software ABAQUS 6.10-1 were used. Then, the obtained results of the test and analysis have been compared. The confirmed models have been used for the analysis of two-dimensional frame of plain and perforated steel plate shear walls with a regular pattern of positing holes in the screen, buckling restrained brace and moment frame of 4 floors.