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| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
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| I SECTION |
| Section with central web, two equal parallel flanges perpendicular and the overall depth exceeds 1.2 times the width of the flange. |
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| IMPACT |
| Dynamic loads, (other than wind loads) imparted to the structure by shock or collision. |
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| IMPOSED LOAD |
| Externally applied load on a structure or member, (other than wind load), produced by the external environment and/or intended occupancy or use. (See BS6399.) |
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| INDETERMINATE STRUCTURE |
| A structural frame or member that cannot be analysed by statics (e.g. continuous beam, portal frame rigid frame). |
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| INDUSTRIAL BUILDING |
| A building specifically built to house an industrial process or for storage (e.g. factory buildings, warehouse). |
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| INERTIA |
| Inability of the structure to move of itself. (The second moment of area of section about the elastic neutral axis is sometimes referred to as moment of inertia.) |
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| INFILL PANEL |
| Non load bearing section of cladding built between load bearing columns. |
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| INSTABILITY |
| Inability to carry further load due to loss of stiffness (Instability is largely independent of strength.) |
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| INSULATION |
| Material with low thermal conductivity used to reduce the temperature difference between the internal and external environment. |
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| IMPACT |
| Dynamic loads, (other than wind loads) imparted in the structure by shock or collision. |
