AISC LRFD 1.pdf

GLOSSARYxxvEffective moment of inertia. The moment of inertia of the cross section of a member thatremains elastic when partial plastification of the cross section takes place, usuallyunder the combination of residual stress and applied stress. Also, the moment of inertiabased on effective widths of elements that buckle locally. Also, the moment of inertiaused in the design of partially composite membersEffective stiffness. The stiffness of a member computed using the effective moment ofinertia of its cross sectionEffective width. The reduced width of a plate or slab which, with an assumed uniformstress distribution, produces the same effect on the behavior of a structural member asthe actual plate width with its nonuniform stress distributionElastic analysis. Determination of load effects (force, moment, stress, as appropriate) onmembers and connections based on the assumption that material deformation disappearson removal of the force that produced itElastic-perfectly plastic. A material which has an idealized stress-strain curve that varieslinearly from the point of zero strain and zero stress up to the yield point of the material,and then increases in strain at the value of the yield stress without any further increasesin stressEmbedment. A steel component cast in a concrete structure which is used to transmitexternally applied loads to the concrete structure by means of bearing, shear, bond, friction,or any combination thereof. The embedment may be fabricated of structural-steelplates, shapes, bars, bolts, pipe, studs, concrete reinforcing bars, shear connectors, orany combination thereofEncased steel structure. A steel-framed structure in which all of the individual framemembers are completely encased in cast-in-place concreteEuler formula. The mathematical relationship expressing the value of the Euler load interms of the modulus of elasticity, the moment of inertia of the cross section, and thelength of a columnEuler load. The critical load of a perfectly straight, centrally loaded pin-ended columnEyebar. A particular type of pin-connected tension member of uniform thickness withforged or flame-cut head of greater width than the body proportioned to provideapproximately equal strength in the head and bodyFactored load. The product of the nominal load and a load factorFastener. Generic term for welds, bolts, rivets, or other connecting deviceFatigue. A fracture phenomenon resulting from a fluctuating stress cycleFirst-order analysis. Analysis based on first-order deformations in which equilibriumconditions are formulated on the undeformed structureFlame-cut plate. A plate in which the longitudinal edges have been prepared by oxygencutting from a larger plateFlat width. For a rectangular HSS, the nominal width minus twice the outside cornerradius. In absence of knowledge of the corner radius, the flat width may be taken as thetotal section width minus three times the thicknessLRFD Specification for Structural Steel Buildings, December 27, 1999AMERICAN INSTITUTE OF STEEL CONSTRUCTION