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Extra info for ANSI AISC 358-05 Prequalified Connections for Special and Intermediate Steel Moment Frames for Seism

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Prequalified Connections for Special and Intermediate Steel Moment Frames for Seismic Applications AMERICAN INSTITUTE OF STEEL CONSTRUCTION, INC. AISC_Prequalified 2/20/06 4:17 PM Page 33 CHAPTER 6. 2 – 33 Welding Details Welding of the beam to the end-plate shall conform to the following limitations: (1) Weld access holes shall not be used. (2) The beam web to end-plate joint shall be made using either fillet welds or complete joint penetration (CJP) groove welds. When used, the fillet welds shall be sized to develop the full strength of the beam web in tension from the inside face of the flange to 6 in.

When beams are moment connected to the side plates of boxed wide-flange column sections, continuity plates or cap plates should always be provided opposite the beam flanges, as is required for box section columns. 4b Continuity Plate to Column Attachment The attachment of continuity plates to column webs is designed to be capable of transmitting the maximum shear forces that can be delivered to the continuity plate. This may be limited by the beam-flange force, the shear strength of the continuity plate itself, or the welded joint between continuity plate and column flange.

Where they occurred, these brittle fractures prevented the formation of ductile plastic hinge zones and resulted in frame behavior substantially different from that upon which the design requirements for these systems were based. Following this discovery, the Federal Emergency Management Agency (FEMA) provided funding to a coalition of universities and professional associations, known as the SAC Joint Venture. Over a period of six years, the SAC Joint Venture, with participation from AISC, AISI, AWS and other industry groups, conducted extensive research into the causes of the damage that had occurred in the Northridge earthquake and effective means of reducing the possibility of such damage in future earthquakes.

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