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| LACED STANCHION |
| A compound section comprising of two main components connected together by a system of triangulated lacing bars. See BS5950: Part 1. |
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| LATERAL RESTRAINT |
| Beam restraint that prevents lateral movement of the compression flange. Compression member restraint that prevents lateral movement or twisting of the member. |
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| LATTICE FRAME |
| A triangulated structural frame fabricated from structural sections (also, lattice girder, lattice rafter). |
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| LAYER |
| Members in a perpendicular plane (double layer space frame). |
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| LAYOUT |
| Plan of structural framing (e.g. floor layout, stanchion layout). |
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| LEAN-TO |
| Small extension added to a building and partially supported by the building |
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| LEVEL |
| See Datum |
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| LIMIT STATES |
| The state at which a structure would become unfit its intended use is termed Serviceability Limit State and is checked using unfactored loads. The state which if exceeded can cause collapse of part or whole of the structure using factored loads is termed Ultimate Limit State (see BS5950 Part 1). |
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| LINTEL LIVE |
| Steel beam spanning door or window openings. |
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| LOAD |
| See imposed load. See BS6399. |
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| LOAD BEARING WALL |
| A wall supporting applied loads in addition to its own weight. |
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| LONGITUDINAL AXIS |
| Axis along the length of the member passing through the centroid. |
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| LUG ANGLE |
| Short length of angle fastened to the end of the member and its connection to distribute the member force to the connection. |
