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Glossary

Glossary Terms beginning with P
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PACKING PLATE
A steel plate placed between two members at a connection to ensure a tight fit (take up tolerance).
PARASITIC BENDING MOMENT
A bending moment which arises because a frame (plane frame or space frame) deforms under load. If the width/depth of the members of the frame is greater than about 1/20 of their length the deformations can cause significant bending effects in the members of a frame which the designers conceived as being axially loaded. The bending effects are usually unwelcome because they do not carry loads in an efficient way.
PARENT METAL
The steel members to be joined by welding (base metal).
PARTITION
Non-loading bearing wall within a building.
PATENT GLAZING
A system of fixed panes of glass supported at regular intervals by special bars fixed to a purlin or side rail system.
PATTERN LOADING
Loading arranged in such a manner as to give the most severe effect on the member.
PILE
A steel section driven to the ground to form part of a foundation system for a structure. (Sheet piling, a series of interlocking steel sections driven into the ground to retain material or water.)
PILLAR
Vertical compression member usually constructed from masonry.
PINNED CONNECTION
A connection which carries only shear or axial loads (i.e. not bending moments). The pin may be a simple design concept or it may be expressed visually.
PITCH FASTENER
Distance between consecutive fastens on line.
PLANE FRAME
A series of members joined together in one plane to form a framework. (Pin joined, rigid, triangulated.)
PLANT
Machinery used by the contractor for working on site.
PLASTIC DESIGN
Design method assuming redistribution of moments within the structure in a continuous construction.
PLASTIC HINGE
Position at which a member has developed its plastic moment of resistance; any additional loading causes rotation and redistribution of stresses or final collapse.
PLASTIC MOMENT
Moment capacity allowing for redistribution of stress within a cross section.
PLASTIC SECTION
A cross section which can develop a plastic hinge with sufficient rotational capacity to allow redistribution of bending moments within the section.
PLATE GIRDER
A fabricated girder made from plates comprising a web and flanges
PLATED BOLTS
Bolts which have been plated with zinc or cadmium to give them corrosion protection.
PLY
Load transmitting part of a bolted connection.
POCKET BASE
A concrete foundation with a pocket cast in to receive a stanchion shaft which is finally grouted up to form the connection between the structure and foundation.
PORTAL FRAME
A single storey continuous plane frame deriving its strength from bending resistance and arch action.
PLUMB
Deviation from vertical in two points on a column.
POST
Secondary vertical member in a structural frame carrying light loads (e.g. gable post, sheeting post).
PRATT TRUSS
A roof truss with vertical struts separating the panels.
PREFABRICATED MEMBERS
Timbers frames or sub-assemblies that have been fabricated at works.
PRESSED STEEL
Thin steel plates shaped by mechanical means such as brake pressing.
PRETENSIONED MEMBERS
A bolt assembly that is tightened to a predetermined tension in the unloaded condition (HSFG Bolt).
PROFILE
Cross section shape. (The term is commonly used for cladding sheets and decking.)
PROJECTION
Drawing of building or component (e.g. 3rd angle projection isometric projection)
PROP
Temporary member used to support framework or permanent members at the construction stage.
PROGRESSIVE COLLAPSE
If, as a result of accidental loading, the failure of one member would trigger failure of the entire building or substantial parts of it then the building is subject to progressive collapse.
PROPPED CANTILEVER
A beam or girder that is rigidly held in position at one end and simply supported at the other.
PROTECTION OF STEELWORK
A steelwork coating system or preventing deterioration of the environment. (See BS5493.)
PURLIN
A secondary member in the plane of the roof and held in position by main roof members.

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