Cyclic Testing of Bracket and WUF-B Type Weak-Axis Steel Moment Connections

브라켓 및 WUF-B 형식 철골모멘트골조 약축접합부 내진성능평가

  • 이강민 (충남대학교 건축학부) ;
  • 정희택 (도시구조안전(주)) ;
  • 윤석용 (충남대학교 건축공학과) ;
  • 이은모 (충남대학교 건축공학과) ;
  • 오경환 (삼성물산(주) 건설부문, 충남대학교)
  • Received : 2008.04.29
  • Accepted : 2008.07.02
  • Published : 2008.08.10

Abstract

There has been much focus on the strong axis steel moment connections after the Northridge earthquake in 1994. However, research studieson the seismic behavior of weak axis moment connections could be hardly found despite the fact that these connection details have been frequently used as seismic details of MRF in Korea. Therefore, the objective of this research is to provide better knowledge on the seismic behavior of weak-axis steel moment connections, which can be widely applicable to many structures with similar characteristics. For this purpose, an experimental program was designed and performed with twotypes of weak-axis steel moment connections, namely the bracket type and WUF-B type, based on the survey of existing field data and literatures. Using the experimental results obtained from the quasi-static cyclic testing of these specimens, structural performances of the joints such as hysteretic curves, maximum strength capacities and the strain of reinforced bars were investigated. From the test results, the bracket-type connection was shown to have more than a 5% story drift capacity, compared with the WUF-B type connection's 4%. These specimens were also shown to have higher strength capacities than the nominal design strength. The bracket-type connection showed a slow strength degradation after maximum strength was researched. However,the WUF-B type connection showed a rapid strength degradation that caused brittle behavior.

Acknowledgement

Supported by : 한국학술진흥재단

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