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| SAG |
| Vertical deflection of a beam below the datum level. |
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| SAGGING MOMENT |
| An applied bending moment causing a sagging deflection in the beam. |
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| SCAFFOLDING |
| Temporary framework providing access and working platforms for construction purposes. |
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| SCREW |
| Round base with a forged head, the shank being threaded to its full length. |
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| SEALING PLATE |
| A plate used to seal a hollow section to prevent water and air entering. |
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| SECTION MODULUS |
| See Modulus (for Elastic Modulus and Plastic Modulus). |
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| SEMI COMPACT SECTION |
| A cross section in which the stress at the extreme fibres should be limited to yield as local buckling would prevent the development of full plastic moment capacity in the section. |
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| SEMI-RIGID DESIGN |
| A design in which some degree of connection stiffness structure being unfit for its intended use. |
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| SERVICEABILITY |
| The limit state which when exceed can lead to the structure being unfit for its intended use. |
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| SHEAR FORCE |
| An internal force acting normal to the longitudinal axis, and is given by the algebraic sum of all forces to one side of the section chosen. |
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| SHAFT |
| Large vertical duct used for housing services or lifts. |
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| SHAPE |
| Profile of a section. |
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| SHED |
| Single storey pitched roof building normally used for industrial or warehouse. |
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| SHEET STEEL |
| Thin steel plate produced by a continuous rolling process. |
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| SHEET PILE |
| An interlocking pile driven side by side to form a wall to retain water or restrain strata. |
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| SHERADISED BOLTS |
| Bolts protected against corrosion by applying a fine layer of zinc. Painting is subsequently required for exposed steel. |
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| SHIMS |
| Steel plate used to take up tolerance, usually referring to column base plates or bearings. |
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| SIMPLY SUPPORTED BEAM |
| A single beam with ends free to rotate at the supports. |
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| SHOP BOLTED |
| A bolted connection completed in a fabricator's works. |
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| SHOP WELDED |
| A welded connection completed in a fabricator's works. |
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| SHOULDERED BOLT |
| A bolt which has the thread diameter several millimetres less than the shank diameter. In this way a shoulder is formed where the bolt shank has been machined down to receive the smaller diameter thread. |
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| SHRINKAGE DUE TO WELD |
| The amount by which a welded joint or member reduces in length on cooling. |
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| SLAB BASE |
| A square or rectangular base plate for the spread of axial load over an area of concrete at a safe working pressure. |
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| SLENDER SECTION |
| A section which can not be loaded to cause yield at the extreme fibres because of premature buckling. |
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| SLENDERNESS RATIO |
| The effective length of a member divided by the appropriate radius of gyration. |
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| SLIDING CONNECTION |
| Usually applied to a beam connection which allows the beam to slide along its axis, while still being supported vertically. |
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| SLIP RESISTANCE |
| The limit of shear that can be applied before slip occurs in a friction grip connection. |
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| SNOW LOAD |
| Imposed load due to snow fall. (An allowance for maintenance is set out in BS6399.) |
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| SPACE FRAME |
| A three dimensional structure. |
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| SPECIFICATION |
| A comprehensive written description of a structure, which details all aspects including, materials, equipment, plant structure, quantities, finishes and workmanship. |
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| SPANDREL BEAM |
| Edge beam. |
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| STABILITY |
| Resistance of the structure or part of the structure to overturning or overall failure. |
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| STIFFENER |
| A component fitted to a main member to strengthen it locally against buckling or crushing, or designed to transmit load and prevent local instability at flange web junction of a beam or column. |
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| STANCHION |
| See column. |
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| STRENGTH |
| Resistance to failure by yielding or buckling. |
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| STRESS INTENSITY |
| Force per unit area on cross section. |
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| STRIP |
| Narrow thin sheet steel produced by a continuous rolling process. |
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| STANDARD |
| See British Standard. |
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| STATIC LOAD |
| A non-cyclic load that produces no dynamic effect. |
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| STAY |
| A light structural member between two other members providing positional restraint. |
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| STRUCTURAL CASING |
| Reinforced concrete casing to a structural steel member to enhance its load carrying capacity (See BS5950: Part 1.) |
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| STRUCTURAL HOLLOW SECTION (SHS) |
| General term applied to hot rolled circular rectangular and square structural sections. |
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| STRUT |
| A member carrying predominantly compressive loads. |
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| SUBMERGED ARC WELDING |
| An automatic or semi-automatic welding process where the arc is covered in flux (usually granular). |
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| SUPERIMPOSED LOAD |
| Any applied load other than dead load. |
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| SURFACE PREPARATION |
| Process of cleaning steelwork to a suitable standard prior to the applications of a first protective coating. |
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| SUSPENDED SPAN BEAM |
| A beam spanning between two other beams. |
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| SUREFAST |
| A construction system developed by Corus that comprises Bi-Steel panels connected by a unique 'slot and lock' system enabling the rapid erection of building structures. |
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| SWAY |
| Sideways movement induced in a structural frame by an applied system of forces. |
