Couverture de Steel Design Guide: Modification of Existing Welded Steel Moment Frame Connections for Seismic Resistance

Steel Design Guide: Modification of Existing Welded Steel Moment Frame Connections for Seismic Resistance

Steel Design Guide: Modification of Existing Welded Steel Moment Frame Connections for Seismic Resistance

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 Focused on the modification of existing steel welded moment frame (WSMF) connections to enhance their seismic performance, particularly in structures built before the 1994 Northridge Earthquake. The text explains that brittle connection failures during that earthquake necessitated new guidelines and outlines three primary retrofit methods: the Reduced Beam Section (RBS), the Welded Haunch, and the Bolted Bracket modifications. The document synthesizes substantial experimental results from various research programs, including the NIST/AISC experimental program, to validate the design procedures for each modification method. Ultimately, the guide provides detailed design procedures and considerations for engineers to ensure modified connections achieve a minimum plastic rotation capacity, satisfying updated seismic performance objectives while addressing practical issues like constructability and cost.

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