Seismic design and hybrid tests of a full-scale three-story buckling-restrained braced frame using welded end connections and thin profile

Pao Chun Lin, Keh Chyuan Tsai, Kung Juin Wang, Yi Jer Yu, Chih Yu Wei, An Chien Wu, Ching Yi Tsai, Chih Han Lin, Jia Chian Chen, Andreas H. Schellenberg, Stephen A. Mahin, Charles W. Roeder

Research output: Contribution to journalArticlepeer-review

52 Citations (Scopus)

Abstract

A series of hybrid and cyclic loading tests were conducted on a three-story single-bay full-scale buckling-restrained braced frame (BRBF) at the Taiwan National Center for Research on Earthquake Engineering in 2010. Six buckling-restrained braces (BRBs) including two thin BRBs and four end-slotted BRBs, all using welded end connection details, were installed in the frame specimen. The BRBF was designed to sustain a design basis earthquake in Los Angeles. In the first hybrid test, the maximum inter-story drift reached nearly 0.030rad in the second story and one of the thin BRBs in the first story locally bulged and fractured subsequently before the test ended. After replacing the BRBs in the first story with a new pair, a second hybrid test with the same but reversed direction ground motion was applied. The maximum inter-story drifts reached more than 0.030rad and some cracks were found on the gusset welds in the second story. The frame responses were satisfactorily predicted by both OpenSees and PISA3D analytical models. The cyclic loading test with triangular lateral force distribution was conducted right after the second hybrid test. The maximum inter-story drift reached 0.032, 0.031, and 0.008rad for the first to the third story, respectively. This paper then presents the findings on the local bulging failure of the steel casing by using cyclic test results of two thin BRB specimens. It is found that the steel casing bulging resistance can be computed from an equivalent beam model constructed from the steel core plate width and restraining concrete thickness. This paper concludes with the recommendations on the seismic design of thin BRB steel casings against local bulging failure.

Original languageEnglish
Pages (from-to)1001-1020
Number of pages20
JournalEarthquake Engineering and Structural Dynamics
Volume41
Issue number5
DOIs
Publication statusPublished - 2012 Apr 25

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Earth and Planetary Sciences (miscellaneous)

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