AISC LRFD 1.pdf

xxxGLOSSARYShape factor. The ratio of the plastic moment to the yield moment, or the ratio of the plasticmodulus to the section modulus for a cross sectionShear friction. Friction between the embedment and the concrete that transmits shearloads. The relative displacement in the plane of the shear load is considered to beresisted by shear-friction anchors located perpendicular to the plane of the shear loadShear lugs. Plates, welded studs, bolts, and other steel shapes that are embedded in theconcrete and located transverse to the direction of the shear force and that transmitshear loads, introduced into the concrete by local bearing at the shear lug-concreteinterfaceShear wall. A wall that resists, in its own plane, shear forces resulting from applied wind,earthquake, or other transverse loads or provides frame stability. Also called a structuralwallSidesway. The lateral movement of a structure under the action of lateral loads, unsymmetricalvertical loads, or unsymmetrical properties of the structureSidesway buckling. The buckling mode of a multistory frame precipitated by the relativelateral displacements of joints, leading to failure by sidesway of the frameSimple plastic theory. See Plastic designSingle curvature. A deformed shape of a member having one smooth continuous arc, asopposed to double curvature which contains a reversalSlender-element section. The cross section of a member which will experience localbuckling in the elastic rangeSlenderness ratio. The ratio of the effective length of a column to the radius of gyration ofthe column, both with respect to the same axis of bendingSlip-critical joint. A bolted joint in which the slip resistance of the connection is requiredSpace frame. A three-dimensional structural framework (as contrasted to a plane frame)Splice. The connection between two structural elements joined at their ends to form a single,longer elementStability-limit load. Maximum (theoretical) load a structure can support when second-orderinstability effects are includedStepped column. A column with changes from one cross section to another occurring atabrupt points within the length of the columnStiffener. A member, usually an angle or plate, attached to a plate or web of a beam orgirder to distribute load, to transfer shear, or to prevent buckling of the member towhich it is attachedStiffness. The resistance to deformation of a member or structure measured by the ratio ofthe applied force to the corresponding displacementStory drift. The difference in horizontal deflection at the top and bottom of a storyStrain hardening. Phenomenon wherein ductile steel, after undergoing considerabledeformation at or just above yield point, exhibits the capacity to resist substantiallyhigher loading than that which caused initial yieldingLRFD Specification for Structural Steel Buildings, December 27, 1999AMERICAN INSTITUTE OF STEEL CONSTRUCTION