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Special Truss Moment Frames with Vierendeel Segments

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Blue Book Article 8.03.040

A Truss Moment Frame (TMF) is a building framing system that is used for relatively long bay widths. This framing system provides higher lateral stiffness with relatively less weight as compared to moment framing systems with solid beams. Previous editions of the Uniform Building Codes allowed the use of trusses as a Special Moment-Resisting Frame (SMRF) as indicated in Section 2211.7.6, which stated “Trusses may be used as horizontal members in SMRF if the sum of the truss seismic force flexural strength exceeds the sum of the column seismic force flexural strength immediately above and below the truss by a factor of at least 1.25.” In other words, this allowed the strong truss-weak column concept in seismic zones.