PERFORMANCE EVALUATION OF BUCKLING RESTRAINED BRACE WITH TUBULAR PROFILE

Publish Year: 1395
نوع سند: مقاله کنفرانسی
زبان: English
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ICSAU04_0531

تاریخ نمایه سازی: 11 مرداد 1396

Abstract:

the past years the use of buckling restrained braces (BRBs) have had a dramatic growth due to their better performance comparing to conventional braces. BRBs have more ductility and energy absorption capacity by excluding the overall brace buckling.This article aims to discuss a simple, easy replaceable yet efficient kind of buckling restrained brace which is a all-steel BRB, made up of two major components as all conventional ones do: (1) a steel core carrying the whole axial forces and (2) a steel restrainer tube that prevents the core from buckling; the filling mortar has been eliminated leading to a simple detailing BRB system. The proposed BRB consisting of a rectangular tube core has been investigated and results are compared to the ones obtained by researches done before on a configuration with a plate core profile with the same core cross sectional area and their hysteretic behaviour has been contrasted.It is known that when the wall thickness of the restrainer tube is small compared to its width or to the cross-section area of the core plate, the limiting condition of local buckling may not be satisfied and it causes instability and loss of strength of the BRB. In this study, a parametric investigation for BRBs with different formations has been performed to verify the effect of the design parameters such as different core section profiles, restraining member width to thickness ratio and relative cross-sectional area of core to restrainer, on buckling load evaluation. The proposed BRB investigation results have been also presented comparing to the ones obtained by past researches on BRBs with plate profile as the core section and the advantages and disadvantages of this configuration has been discussed and it is concluded that BRBs with tubular core section exhibit a better seismic performance than the ones with plate core profile.

Authors

Alireza Rahai

Professor, Civil Eng Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran

Mina Mortazavi

Msc, Civil Eng Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran

Reza Bani Ardalan

During Msc, Construction Materials Institute (CMI), School of civil engineering, University of Tehran, Iran

Peyman Mehrabi

Msc, Civil Eng. Department, Khaje Nasir University of Technology, Tehran, Iran