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| BACK GOUGING |
| The removal of poor quality root material by disc grinding or arc-air. |
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| BACK TO BACK |
| Description of a compound member composed of two angles or channels, adjacent legs or webs fixed together with or without spacers. |
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| BACKING STRIP |
| A piece of steel used to help form a sound root to a weld. |
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| 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. |
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| 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. |
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| 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. |
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| BLACK BOLTS |
| Normal bolts, usually with no corrosion protection, and grade 4.6. |
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| BLAST PROTECTED STRUCTURES |
| Structures constructed in materials that are designed to withstand explosive attack. |
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| BRITISH STANDARD |
| Document issued by British Standards Institution. |
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| BUCKLING |
| Deformation of element or structure under compressive or shear loading; the deformation is usually normal to the direction of applied load. |
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| BUILT-IN |
| Support fixings to beams that prevent end rotations under load (fixed and encastre). |
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| BUILTUP |
| Compound member fabricated from hot rolled sections and plate. |
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| BRITTLE FRACTURE |
| Loss of ductility and strength associated with low temperatures and imperfections |
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| BILLET |
| Small steel ingot produced for passing through a sections rolling mill. |
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| BUTT WELD |
| Fusion weld between two parts edge to edge, or edge to surface to develop full strength of parent material (see BS5950). |
