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A note from the engineer of record on an approved shop drawing for San Francisco's Salesforce Transit Center appears to have initiated an instruction to the steel fabricator to cut two 2-in. x 4-in. holes in the bottom flanges of the hub's built-up plate girders.
A dual steel-plate composite shear-wall system, currently undergoing physical testing, has the potential to replace reinforced concrete cores in high-rise office buildings.
The 2016 update of the American Institute of Steel Construction standard “Prequalified Connections for Special and Intermediate Steel Moment Frames for Seismic Applications (ANSI/AISC 358-16)” has nine prequalified beam-to- column moment connections, or four more than the 2010 edition and seven more than the original 2005 standard.
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