Radius of Gyration (r) Is the distance from the neutral axis of a section to an imaginary point at which the whole area of the section could be concentrated and still have the same moment of inertia. Formula: The square root of (the moment of inertia in inches^4 divided by the area of the section in inches^2) expressed in inches. Rafter The main beam supporting a roof system or a sloping roof framing member. Rake The edge of a roof which intersects the gable part of a roof. RCSC (Research Council on Structural Connections) Abbreviation. Reaction The force or moment developed at the points of a support. Redundants The reactions which are not necessary for static equilibrium. Reinforcement An additional member added to a structural member to provide additional strength. Reinforcing The process of strengthening a member with some additional piece of material. Relaxation Is a decrease in load or stress of a member under a sustained constant deformation. Repair The reconstruction or renewal of any part of an existing structure or building for the purpose of its maintenance. Residual Stress Pre induced stresses within a structural member due to uneven cooling of the shape after hot-rolling. Resistance The capacity of a structure or structural member to resist the effects of loads or forces imposed on it. Retaining Wall A wall designed to resist the lateral displacement of soil, water, or any other type of material. Rib A fabricated fold or bend in a sheet of deck which projects up from a horizontal plane. Ridge The highest point on the roof of a building formed by two intersecting slopes or the horizontal line made by the top surfaces of the two intersecting sloping roof surfaces. Rigid Connection A connection where moment is transfered from one member to another. See also Fixed-End Support. Rigid Frame or Structure A structural framing system consisting of members joined together with moment or rigid connections which maintain their original angular relationship under load without the need for bracing in its plane. See Frame and Stability. Rise The vertical distance from the bottom to the top of an entity. RMI (Rack Manufacturers Institute) An institute organized in 1958 by industry leaders as a not-for-profit trade association. Its mission is to advance standards, quality, safety, and general fitness for intended use of industrial steel storage rack systems. Rod A smooth solid round bar used for the web system of a bar joist. Roof Covering The exposed exterior roof skin of a building which can be sheets, panels or other materials. Roof Overhang A roof extension that projects beyond the ends or sides of a building. Roller Support This type of support has two degrees of freedom, it can freely rotate about its axis or displace in one direction in the plane. Only one reactive force exists at a roller which acts perpendicular to the path of the displacement and its line of action passes through the center of the roller.
Posted on: Mon, 02 Dec 2013 17:21:50 +0000
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