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Glossary

Glossary Terms beginning with B
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BACK GOUGING
The removal of poor quality root material by disc grinding or arc-air.
BACK TO BACK
Description of a compound member composed of two angles or channels, adjacent legs or webs fixed together with or without spacers.
BACKING STRIP
A piece of steel used to help form a sound root to a weld.
BACKMARK
Standard dimensions for drilling holes in angle legs and channel flanges measured from the corner of the angle across the leg to the hole centre. See standard tables.
BENDING MOMENT
The bending moment due to a force (or system of forces) at a cross section is given by the algebraic sum of all moments to one side of the section.
BI-STEEL
A Corus- patented high performance construction material comprising two steel plates that are permanently connected by transverse bars to form panels which are then filled with ready-mixed concrete.
BLACK BOLTS
Normal bolts, usually with no corrosion protection, and grade 4.6.
BLAST PROTECTED STRUCTURES
Structures constructed in materials that are designed to withstand explosive attack.
BRITISH STANDARD
Document issued by British Standards Institution.
BUCKLING
Deformation of element or structure under compressive or shear loading; the deformation is usually normal to the direction of applied load.
BUILT-IN
Support fixings to beams that prevent end rotations under load (fixed and encastre).
BUILTUP
Compound member fabricated from hot rolled sections and plate.
BRITTLE FRACTURE
Loss of ductility and strength associated with low temperatures and imperfections
BILLET
Small steel ingot produced for passing through a sections rolling mill.
BUTT WELD
Fusion weld between two parts edge to edge, or edge to surface to develop full strength of parent material (see BS5950).

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