EXPERIMENTAL STUDY ON BRB STABILITY WITH FLEXURAL-DEFORMED RESTRAINER
Journal
World Conference on Earthquake Engineering proceedings
Journal Volume
2021
Start Page
2g-0034
ISSN
30065933
Date Issued
2021
Author(s)
Abstract
Researches on buckling-restrained braces (BRBs) have indicated the gusset rotational stiffness, strength and the BRB global stability are very critical to the expected seismic performance of buckling-restrained braced frames (BRBFs). Two BRB out-of-plane (OOP) stability assessment procedures have been developed recently by others. However, they either were not valid for the welded-end BRBs commonly used in Taiwan or required enormous calculating demands. This study develops a simplified analytical model using the concept of the notional load and considering the flexural restrainer to assess the BRB global stability. Cyclic loading tests on four full-scale BRBs of a yield strength of about 988 kN with varying restrainer stiffness, gusset thickness and with/without edge stiffeners or OOP end drift were conducted to demonstrate the effectiveness of the proposed method. Test results confirm that the effects of the initial imperfection, OOP drift, and gusset edge stiffener on the BRB and gusset global buckling strength can be satisfactorily predicted using the proposed method.
Subjects
buckling mechanism
buckling-restrained brace
flexural restrainer
global stability
notional load
Publisher
International Association for Earthquake Engineering
Type
conference paper