Member of a shear wall, strap braced wall or diaphragm that forms the perimeter, interior opening, discontinuity or re-entrant corner.Ī structural member that forms the top or bottom component of a truss. Structural elements that are installed to provide restraint or support (or both) to other structural members or nonstructural members so that the complete assembly forms a stable structure.Ī horizontal structural member that supports ceiling components and which may be subject to attic loads. Also called a web stiffener.Ĭ-shaped member, break shape, flat strap material, or component assemblies attached to structural members, flat strap or sheathing panels to transfer shear forces or stabilize members.īlocking that transmits shear between the panels of a shear wall or diaphragm.īlocking that provides torsional restraint to the studs in a shear wall. The thickness of bare steel exclusive of all coatings.Īdditional material that is attached to the web to strengthen the member against web crippling. Īn organization, political subdivision, office, or individual charged with the responsibility of administering and enforcing the provisions of the applicable building code.ĭesign strength or allowable strength, as appropriate.
#Cold formed steel framing members code#
Load combination in the applicable building code intended for allowable strength design (allowable stress design). Method of proportioning structural components such that the allowable strength equals or exceeds the required strength of the component under the action of the ASD load combinations. The building code under which the building is designed.Īcceptable to the authority having jurisdiction. Nominal strength divided by the safety factor R n/Ω. In Type II shear walls, the unadjusted shear resistance multiplied by the shear resistance adjustment factor. To provide a primer for everyone from novice to expert, we have built a list of common (and not-so-common) terms from the AISI S240-15, North American Standard for Cold-Formed Steel Structural Framing, 2015 Edition. Energy dissipation within the damaged half-wave(s) is higher for lower cross-sectional slenderness and increasing section modulus, key trends that will be useful for generally defining cyclic hysteretic response of thin-walled cold-formed steel members in planned future work.When it comes to designing and building with cold-formed steel framing, you need a good grasp of industry and technical terms, from adjusted shear resistance to z-shape. Local and distortional buckling specimens resulted in more dissipated energy per cycle compared to global buckling specimens, but the energy dissipation rapidly decreased as applied displacements increased. Energy dissipation per cycle in members undergoing lateral-torsional buckling remained constant through large flexural rotations because the failure mechanism involved mid-span cross-section rigid body motion without plastic deformations spreading across the cross section. In members experiencing lateral-torsional buckling, damage localized at the C-section flange-stiffening lip but distinct flexural hinges were not observed. Members experiencing local and distortional buckling accumulated damage at the compressed web and flanges within the leading buckled half-wave that spread throughout the cross-section forming flexural hinges after several cycles. Abrupt drops in flexural strength after peak moment were observed with subsequent stiffness degradation and pinching of the moment-rotation response associated with straightening of buckling deformations during loading direction reversals. A cyclic loading protocol was adapted from FEMA 461 with targets based on elastic buckling properties. Specimen cross-section dimensions and lengths were selected to isolate specific buckling modes (i.e., local, distortional or global buckling). Understanding the cyclic flexural moment-rotation ( M– θ) response of individual members is essential in developing analytical models that can facilitate analysis-based design of cold-formed steel building systems. This manuscript summarizes an experimental program investigating the cyclic flexural behavior and energy dissipation of C-shaped cold-formed steel structural framing members experiencing global, distortional or local buckling.