Seismic Retrofit of Welded Steel Moment Connections Considering the Presence of Composite Floor Slabs
분 류 연구문헌 - 학회논문 - 논문
저자 이철호, 김성용
수록지 한국강구조학회 논문집 : Vol.29 No.1
발행년도 2017년 - 02월
키워드 바닥슬래브, 용접철골모멘트접합부, 내진보강
공개된 논문은 로그인하셔야 보실 수 있습니다.
In the 1994 Northridge earthquake, connection damage initiated from the beam bottom flange was prevalent. The presence of a concrete slab and resulting composite action was speculated as one of the critical causes of the prevalent bottom flange fracture. In this study, four seismic retrofit schemes are proposed in order to salvage welded steel moment connections with composite floor slabs in existing steel moment frames. Because top flange modification of existing beams is not feasible due to the presence of a concrete floor slab, three schemes of bottom flange modification by using welded triangular or straight haunches or RBS(reduced beam section), and beam web strengthening by attaching heavy shear tab were cyclically tested and analyzed. Test results of this study show that haunch and web-strengthened specimens can eliminate the detrimental effect caused by composite action and ensure excellent connection plastic rotation exceeding 5% rad. Design recommendations for each retrofit scheme together with supplemental numerical studies are also presented.
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