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BRIDGE TERMS - O |
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offset |
offset - a horizontal distance measured at right angles to a survey line to locate a point off the line on center - a description of a typical dimension between the centers of the objects being measured open spandrel arch - a bridge which has open spaces between the deck and the arch members allowing "open" visibility through the bridge open spandrel ribbed arch - a structure in which two or more comparatively narrow arch rings, called ribs, function in the place of an arch barrel; the ribs are rigidly secured in position by arch rib struts located at intervals along the length of the arch; the arch ribs carry a column type open spandrel construction which supports the floor system and its loads operator's house - the building containing the power plant and operating machinery and devices required for the operator's (bridge tender's) work in executing the complete cycle of opening and closing a movable bridge span orthotropic - a description of the physical properties of a material that has pronounced differences in two or more directions at right angles to each other; see ANISOTROPY outlet - in hydraulics, the discharge end of drains, sewers, or culverts out-of-plane distortion - distortion of a member in a plane other than that which the member was designed to resist overload - a weight greater than the structure is designed to carry overpass - the uppermost feature in a grade separated crossing overturning - tipping over, rotational movement oxidation - the chemical breakdown of a substance due to its reaction with oxygen from the air oxidized steel - rust |
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