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RISS 인기검색어
- 검색키워드
- 저자 : Mohammad Bahirai (검색결과 1 건)
- 무료
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- 유료
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Seismic Rehabilitation of Steel Frame Connections Through Asymmetrically Weakening the Beam
Mohammad Bahirai,Mohsen Gerami 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.4
Poor seismic performance of steel frame connections were proved after the Northridge earthquake (1994) which led to fundamental change in acceptance criteria of the steel frame connections. New design codes consider the plastic hinge to be located far from the column face to prevent brittle fractures at or near welds. In these cases there is a need to retrofi t the existing steel frame buildings which have been designed according to Pre-Northridge seismic codes. In current study, several experimental tests were conducted to investigate the infl uence of two retrofi t techniques on cyclic behavior of a Pre- Northridge connection. The techniques involved intentionally weakening the beam to trigger the plastic hinge to a predefi ned location in the beam. The retrofi t scenario was implemented through reduction and annealing the beam bottom fl ange. For the Pre-Northridge connection a tear damage mechanism was observed near the welded joint accompanied by a sudden drop in connection strength, while the retrofi tted specimens were able to relocate the plastic hinge away from the column face. In reduced specimens, top and bottom fl anges of the beam showed local buckling near the joint at the end of loading, however in annealing technique low stress demands in near weld region was resulted. It was concluded that area reduction of the beam would make the connection prone to out of plane buckling.
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