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A built up plate member consisting of flanges welded to a variable depth web. |
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End truck wheels with treads which are tapered, the large diameter being toward the center of the span. |
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The longitudinal pulling stress a material can bear without tearing apart. |
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Forces acting on a member tending to elongate it. |
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A spacer of low thermal conductance material. |
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The time rate of heat flow through unit area of a body induced by unit temperature difference between the body surfaces. Units are Btu / (hour x ft2 x °F) [Imperial system] or Watts / (m2 x °C) [SI system]. See "Thermal resistance". |
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The time rate of heat flow through unit thicknesses of a flat slab of a homogenous material in the perpendicular direction to the slab surfaces induced by unit temperature gradient. Units for k are (Btu x in) / (hour x ft2 x °F) or Btu / (hour x ft x °F) [Imperial system] and Watts / (m x °C ) [SI system]. See "Thermal resistively". |
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Under steady conditions, the mean temperature difference between two defined surfaces of material or construction that induces unit heat flow through unit area. Note: Thermal resistance and thermal conductance are reciprocals. Thermal resistances are R-values; to obtain the U-value factor, overall thermal transmittance, the R-value for either materials or constructions must first be evaluated because, by definition, the U-factor is the reciprocal of the sum of the individual R-values.
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Under steady conditions, the mean temperature difference between two defined surfaces of material or construction that induces unit heat flow through unit area. Note: Thermal resistance and thermal conductance are reciprocals. Thermal resistances are R-values; to obtain the U-value factor, overall thermal transmittance, the R-value for either materials or constructions must first be evaluated because, by definition, the U-factor is the reciprocal of the sum of the individual R-values. |
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The time rate of heat flow per unit under steady conditions from the fluid on the warm side of a barrier to the fluid on the cold side, per unit temperature difference between the two fluids. It is evaluated by first evaluating the R-value and then computing its reciprocal. |
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A through-fastened roof system is one in which the roof panels are attached directly to the roof substructure with fasteners which penetrate through the roof sheets and into the substructure. |
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Reinforcing steel, usually in the concrete, extending from one column pier to the other column pier, tying the two columns of a rigid frame together to resist thrust. |
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The horizontal component of a reaction usually at the column base. |
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A structural member that is loaded in tension. |
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2000 pounds. |
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A metal way for wheeled components; specifically, one or more lines of ways, with fastenings, ties, etc., for a crane way, monorail or slide door. |
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Panels used to admit light. |
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The direction parallel to the main frames. |
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The area directly supported by the structural member between contiguous supports. |
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The light gauge metal used in the finish of a building, especially around openings and at intersections of surfaces. Often referred to as Flashing. |
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The unit carrying the hoisting mechanism. |
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The basic structure of the trolley on which are mounted the hoisting and traversing mechanisms. |
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A structure made up of three or more members, with each member designed to carry a tension or compression force. The entire structure in turn acts as a beam. |
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An extension attached to the bottom of a downspout to direct water away from a wall. Kick-Out. |
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A method for pre-tensioning high strength bolts. The nut is turned from the "Snug tight" position, corresponding to a few blows of an impact wrench or the full effort of a man using an ordinary spud wrench, the amount of rotation required being a function of the bolt diameter and length. |
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Bolts with a segment which shears off at a predetermined torque during bolt tightening. These bolts utilize a specially designed wrench for proper installation. |
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