Metal Building Glossary - "T"

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Building Terms:

Tapered Members
A built up plate member consisting of flanges welded to a variable depth web.

Tapered Tread Wheels
End truck wheels with treads that are tapered, the large diameter being toward the center of the span.

Temperature Reinforcing
Steel rods or wire mesh placed in concrete to help prevent cracks from thermal expansion or contraction.

Temporary Bracing
Materials used by building assemblers to stabilize the metal building system during assembly. Also referred to as erection bracing.

Tensile Strength
The longitudinal pulling stress a material can bear without tearing apart.

Tension Force
A force acting on a body tending to elongate the body. (sliding action)

Tension Forces
Forces acting on a member tending to elongate it.

Thermal Block
A spacer of low thermal conductance material, that is installed between the purlin and the roof insulation, to prevent energy loss.

Thermal Conductance (C Factor)
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 degree F) (Imperial system) or Watts / (m2 x degree C) (SI system). See Thermal Resistance.

Thermal Conductivity (K factor)
The time rate of heat flow through unit thickness of a flat slab of a monogenous 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 degree F) or BTU / (hour x feet x degree F) (Imperial System) or Watts / (m2 x degree C) (SI System). See "Thermal Resistivity".

Thermal Resistance (R value)
Under steady conditions, the mean temperature difference between parallel surfaces of a slab (large enough so there us no lateral heat flow) of unit thickness that induces unit heat flow through unit area. Note: Thermal Resistance and thermal conductance are reciprocals. Thermal resistance are R-values; to obtain the U-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

Thermal Resistivity
Under steady conditions, the temperature difference between parallel surfaces of a slab (large enough so there is no lateral heat flow) of unit thickness that induces unit heat flow through unit area. Note: thermal resistivity and thermal conductivity are reciprocals. Thermal resistivity is the R-value of a material of unit thickness.

Thermal Transmittance (U-factor)
The time rate of heat flow per unit are 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.

Through Ties
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.

Through-Fastened Roof System
A roof system in which the roof panels are attached directly to the roof substructure with fasteners which penetrate through the roof sheets and into the substructure.

The horizontal component of a reaction usually at the column base.

A structural member that is loaded in tension.

Unit of measurement equal to 2000 pounds.

Torsion Force
A force acting on a body which tends to twist the body.

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.

The direction parallel to the main frames.

Tributary Area
The area directly supported by the structural member between contiguous supports.

The light gauge metal used in the finish of a building, specially around openings at intersections of surfaces. Also referred to as flashing.

Trolley (Crane)
The unit carrying the hoisting mechanism.

Trolley Frame (Crane)
The basic structure of the trolley on which are mounted the hoisting and traversing mechanisms.

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.

Turn-of-the-Nut Method
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.

See "Kick-out".

Twist Off Bolts
Bolts with a segment which shears off at a predetermined torque during bolt tightening. These bolts utilized a specially designed wrench for proper installation.

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