Low-cycle fatigue life evaluation of buckling-restrained braces based on cumulative plastic deformation curves. Issue 2 (January 2022)

• Record Type: Journal Article
• Authors: Tong, Chao; Wu, Jing; Hua, Kun; Tian, Huiwen
• Is Part Of: Advances in structural engineering. Volume 25:Issue 2(2022)
• Page Start: 336
• Page End: 354
• Publication Date: 2022-01
• Subjects: earthquake engineering -- building structures -- seismic protection -- evaluation method -- buckling-restrained braces -- cumulative plastic deformation; Structural engineering -- Periodicals; Construction, Technique de la; Structural engineering; Periodicals; 624.1
• DOI: 10.1177/13694332211049991
• Languages: English
• ISSNs: 1369-4332

Abstract

To quantitatively evaluate the low-cycle fatigue life of buckling-restrained braces (BRBs), an evaluation method for BRBs based on the combination of the CPD curves and CPD measurement meter (CMM) is established herein. The difference between two CPD curves (i.e., the CPD curves under constant strain amplitude loading history (C-CPD) and under random strain amplitude loading history (R-CPD)), and their selection criteria to evaluate the low-cycle fatigue life of BRBs are discussed. An example under the variable strain amplitude (VSA) loading history and an example under the multiple earthquakes are carried out. Finally, the CPD limit values of BRBs in the ANSI/AISC 341-10 and FEMA-450 are discussed by statistical analysis of the test results of BRBs. The analysis results show that the C-CPD curve can be used to evaluate the low-cycle fatigue life of BRBs under the VSA loading, and the R-CPD curve can be used to evaluate the low-cycle fatigue life of BRBs under the multiple earthquakes. The degree of reliability of the current CPD limit value is not enough. A CPD limit curve is recommended in this study to quantify the low-cycle fatigue performance of BRBs.