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| PACKING PLATE |
| A steel plate placed between two members at a connection to ensure a tight fit (take up tolerance). |
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| 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. |
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| PARENT METAL |
| The steel members to be joined by welding (base metal). |
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| PARTITION |
| Non-loading bearing wall within a building. |
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| PATENT GLAZING |
| A system of fixed panes of glass supported at regular intervals by special bars fixed to a purlin or side rail system. |
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| PATTERN LOADING |
| Loading arranged in such a manner as to give the most severe effect on the member. |
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| 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.) |
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| PILLAR |
| Vertical compression member usually constructed from masonry. |
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| 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. |
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| PITCH FASTENER |
| Distance between consecutive fastens on line. |
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| PLANE FRAME |
| A series of members joined together in one plane to form a framework. (Pin joined, rigid, triangulated.) |
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| PLANT |
| Machinery used by the contractor for working on site. |
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| PLASTIC DESIGN |
| Design method assuming redistribution of moments within the structure in a continuous construction. |
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| 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. |
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| PLASTIC MOMENT |
| Moment capacity allowing for redistribution of stress within a cross section. |
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| PLASTIC SECTION |
| A cross section which can develop a plastic hinge with sufficient rotational capacity to allow redistribution of bending moments within the section. |
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| PLATE GIRDER |
| A fabricated girder made from plates comprising a web and flanges |
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| PLATED BOLTS |
| Bolts which have been plated with zinc or cadmium to give them corrosion protection. |
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| PLY |
| Load transmitting part of a bolted connection. |
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| 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. |
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| PORTAL FRAME |
| A single storey continuous plane frame deriving its strength from bending resistance and arch action. |
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| PLUMB |
| Deviation from vertical in two points on a column. |
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| POST |
| Secondary vertical member in a structural frame carrying light loads (e.g. gable post, sheeting post). |
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| PRATT TRUSS |
| A roof truss with vertical struts separating the panels. |
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| PREFABRICATED MEMBERS |
| Timbers frames or sub-assemblies that have been fabricated at works. |
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| PRESSED STEEL |
| Thin steel plates shaped by mechanical means such as brake pressing. |
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| PRETENSIONED MEMBERS |
| A bolt assembly that is tightened to a predetermined tension in the unloaded condition (HSFG Bolt). |
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| PROFILE |
| Cross section shape. (The term is commonly used for cladding sheets and decking.) |
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| PROJECTION |
| Drawing of building or component (e.g. 3rd angle projection isometric projection) |
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| PROP |
| Temporary member used to support framework or permanent members at the construction stage. |
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| 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. |
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| PROPPED CANTILEVER |
| A beam or girder that is rigidly held in position at one end and simply supported at the other. |
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| PROTECTION OF STEELWORK |
| A steelwork coating system or preventing deterioration of the environment. (See BS5493.) |
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| PURLIN |
| A secondary member in the plane of the roof and held in position by main roof members. |
