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| DATUM |
| Any level taken as a reference level. |
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| DEAD LOAD |
| All loads of constant magnitude and position that act permanently, including self weight. |
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| DECK |
| Floor slab comprising a steel sheet profile and concrete topping. |
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| DECKING |
| Steel profile used for floor construction to support wet concrete topping. The decking may function as tensile reinforcement after the concrete has cured. |
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| DEEP PENETRATION WELD |
| A weld laid down with a high heat input, which causes the molten weld metal to penetrate further than normal into the parent plate. |
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| DEFLECTION (ELASTIC) |
| Elastic movement of a structure or parts of a structure under applied loads. (e.g. beam deflection, frame deflection). |
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| DISTORTION |
| Deformation produced by fabrication and rolling processes. (Impact, welding, lack of fit). |
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| DEFORMATION |
| Movement. Permanent deflection, non-elastic. |
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| DOME |
| Hemispherical shaped roof or building (ribbed dome cupola). |
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| DURBAR PLATE |
| Steel flooring plate, with non-slip embossments on one surface. (Chequer plate.) |
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| DUCT |
| Prefabricated sheet steel trunking to provide heating and ventilating service to building. |
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| DOUBLE ANGLE |
| A compound structural member comprising two hot rolled angles connected together. |
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| DOWN PIPE |
| A pipe to carry rainwater from a gutter to the drainage system below. (Half round gutter valley gutter.) |
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| DYE PENETRANT TESTING |
| A process for detecting surface cracks in welds using a penetrating dye which seeps in the cracks. When a (white) contrast liquid is applied, the dye leaches into the contrast liquid to reveal the crack. |
