Seismic performance analysis of BRBs and gussets in a full-scale 2-story BRB-RCF specimen

Ching Yi Tsai, Keh Chyuan Tsai*, Li Wei Chen, An Chien Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

The implementation of buckling-restrained braces (BRBs) for new reinforced concrete frame (RCF) constructions is limited. This study investigates the seismic forces and stability in the BRBs and gussets of a 2-story full-scale RCF specimen by using Abaqus models and a newly proposed stability evaluation method. The hybrid and cyclic loading test results are accurately predicted by the Abaqus analyses. Existing methods for computing the gusset interface forces for steel buildings from both the brace and the frame actions are compared with the Abaqus results. The applicability of these methods for the BRB-RCF design is critically evaluated. It is confirmed that the Parallel-2 method is suitable for estimating the BRB force demand imposed on the corner gusset and the generalized uniform force method is good for the corner gusset at the base. In addition, existing stability evaluation methods for BRBs and gussets are applied to investigate the out-of-plane (OOP) buckling of the first-story BRB observed at the end of tests. The proposed stability model incorporates the BRB restrainer's flexural effects and 4 rotational springs in assessing the BRB's buckling. This model confirms that the BRB and the gusset's OOP buckling limit states could be coupled and must be evaluated together. By incorporating the flexural effects of the steel casing and the infilled grout, the proposed model satisfactorily predicts the OOP buckling of the first-story BRB and gussets. These research results can be used for the implementation of BRBs in new RC frame constructions.

Original languageEnglish
Pages (from-to)2366-2389
Number of pages24
JournalEarthquake Engineering and Structural Dynamics
Volume47
Issue number12
DOIs
Publication statusPublished - 10 Oct 2018

Bibliographical note

Funding Information:
The research funding from the National Center for Research on Earthquake Engineering (NCREE) and the Taiwan Ministry of Science and Technology through grant no 104-2221-E-002-114-MY3 is gratefully acknowledged. The assistance of the NCREE laboratory staff and graduate students of National Taiwan University is greatly appreciated. A special thanks to Dr Kung-Juin Wang for his support on experimental technology and Mr Hsun-Horng Yang and Ms Jie-Lun Huang for coordinating the construction and testing of the specimen.

Funding Information:
The research funding from the National Center for Research on Earthquake Engineering (NCREE) and the Taiwan Ministry of Science and Technology through grant no 104‐2221‐E‐002‐114‐MY3 is gratefully acknowledged. The assistance of the NCREE laboratory staff and graduate students of National Taiwan University is greatly appreciated. A special thanks to Dr Kung‐Juin Wang for his support on experimental technology and Mr Hsun‐Horng Yang and Ms Jie‐Lun Huang for coordinating the construction and testing of the specimen.

Publisher Copyright:
© 2018 John Wiley & Sons, Ltd.

Other keywords

  • buckling-restrained brace
  • finite element analysis
  • frame action
  • gusset buckling
  • reinforced concrete frame

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