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Bar Joist
A name commonly used for "Open Web Steel Joists".

 

Base Angle
An angle secured to a wall or foundation used to attach the bottom of the wall paneling.

 

Base Plate
A plate attached to the bottom of a column which rests on a foundation or other support, usually secured by anchor bolts.

 

Base Tube
A continuous member imbedded in the edge of the foundation to which the wall panels are attached.


Bay

The space between the main frames measured perpendicular to the frame.

Beam
A member, usually horizontal, that is subjected to bending loads. There are three types, simple, continuous and cantilever.

 

Beam and Column
A structural system consisting of a series of rafter beams supported by columns. Often used as the end frame of a building.

 

Bearing End Frame
Also referred to as a "Bearing Hot Rolled" endwall. A Bearing End Frame is a structural system consisting of a series of hot rolled rafter beams supported by hot rolled columns connected by a series of pinned connections. A Bearing End Frame is NOT a Main Frame and will not stand alone without some type of additional bracing or diaphragm action. Often used as the end wall framing of a building. See also Beam and Column.

 

Bearing Hot Rolled
Also referred to as a "Bearing End Frame" endwall. A Bearing End Frame is a structural system consisting of a series of hot rolled rafter beams supported by hot rolled columns connected by a series of pinned connections. A Bearing End Frame is NOT a Main Frame and will not stand alone without some type of additional bracing or diaphragm action. Often used as the end wall framing of a building. See also Beam and Column.

 

Bearing Plate
A steel plate that is set on the top of a masonry support on which a beam or purlin can rest.

 

Bent
An assemblage of rafters and columns that support the secondary framing members and transfer loads directly to the foundation.
This is also sometimes referred to as a Main Frame.

 

Bill of Materials
A list that enumerates by part number or description each piece of material or assembly to be shipped. Also called tally sheet or shipping list.

 

Bird Screen
Wire mesh used to prevent birds from entering the building through ventilators and louvers.

 

Blind Rivet

A small headed pin with expandable shank for joining light gauge metal. Typically used to attach flashing, gutter, etc.

 

Box Girder
Girders, trucks or other members of rectangular cross section enclosed on four sides.

 

Bracing
Rods, angles or cables used in the plane of the roof and walls to transfer loads, such as wind, seismic and crane thrusts to the foundation.

 

Bracket
A structural support projecting to a structural member. Examples are canopy brackets, lean-to brackets, and crane runway brackets.

 

Bridge (Crane)
That part of an overhead crane consisting of girders, trucks, end ties, walkway and drive mechanism which carries the trolley and travels in direction parallel to the runway.

 

Bridge Crane
A load lifting system consisting of a hoist which moves laterally on a beam, girder or bridge which in turn moves longitudinally on a runway made of beams and rails.


Bridging
Bracing or systems of bracing used between structural members.

 

British Thermal Unit (BTU)
That amount of heat required to raise the temperature of one pound of water by 1°F.

 

Building
A structure forming an open, partially enclosed, or enclosed space constructed by a planned process of combining materials, components, and subsystems to meet specific conditions of use.

 

Building Aisle
A space defined by the length of the building and the space between building columns.

 

Building Code
Regulations established by a recognized agency describing design loads, procedures and construction details for structures usually applying to a designated political jurisdiction (city, county, state, etc.). These standards are required by the local building/construction regulations. Meeting these standards is required to obtain a building permit.
The Industry standard Code for Metal Building Design is MBMA (Metal Building Manufacturers Association), and this standard is accepted by many state and city officials. However, determining the required local jobsite standard is the responsibility of the Builder. Additional Information can be obtained from your Building Code Manual.
Building Code and edition requirements should be obtained from the local building code official.

 

Built-Up Roofing
A roof covering made up of alternating layers of tar and asphaltic materials.

 

Built-Up Section
A structural member, usually an I-shaped section, made from individual flat plates welded together.

 

Bumper
An energy-absorbing device for reducing impact when a moving crane or trolley reaches the end of its permitted travel; or when two moving cranes or trolleys come into contact.

 

Butt Plate
The end plate of a structural member usually used to rest against a like plate of another member in forming a connection. Sometimes called a splice plate or bolted end plate.

 

Bypass Girt
A wall framing system where the girts are mounted on the outside of the building columns. See also Exterior Framed.

 

 
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