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http://dx.doi.org/10.5000/EESK.2003.7.3.069

Cyclic Seismic Performance of Reduced Beam Section Steel Moment Connections: Effects of Panel Zone Strength and Beam Web Connection Type  

Lee, Cheol-Ho (서울대학교 건축학과)
Jeon, Sang-Woo (포항산업과학원 강건재연구소)
Kim, Jin-Ho (포항산업과학원 강건재연구소)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.7, no.3, 2003 , pp. 69-77 More about this Journal
Abstract
This paper presents test results on eight reduced beam section(RBS) steel moment connections. The testing program addressed bolted versus welded web connection and panel zone(PZ) strength as key variables, Specimens with medium PZ strength were designed to promote energy dissipation from both PZ and RBS regions such that the requirement for expensive doublet plates could be reduced. Both strong and medium PZ specimens with a welded web connection were able to provide satisfactory connection rotation capacity for special moment-resisting frames. On the other hand, specimens with a bolted web connection performed poorly due to premature brittle fracture of the beam flange of the weld access hole. If fracture within the beam flange groove weld was avoided using quality welding, the fracture tended to move into the beam flange base metal of the weld access hole. Plausible explanation of a higher incidence of base metal fracture in bolted web specimens was presented. The measured strain data confirmed that the classical beam theory dose not provide reliable shear transfer prediction in the connection. The practice of providing web bolts uniformly along the beam depth was brought into question. Criteria for a balanced PZ strength improves the plastic rotation capacity while reduces the amount of beam distortion ore also proposed.
Keywords
steel moment connection; reduced beam section; panel zone; beam web connection; seismic testing;
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