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| RADIOGRAPHIC WELD TESTING |
| A photograph of the interior of the weld is used to detect flaws, using X-rays or radioactive isotopes. |
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| RADIUS OF GYRATION |
| Geometrical property of cross section, (given by the square root of the second moment of area divided by the area of the section). |
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| RAFTER |
| Structural member forming the slop of a pitched roof. (Portal frame rafter, truss rafter.) |
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| RAIL |
| Cladding rail is a secondary member forming part of the side wall framing supporting the vertical cladding. |
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| REAMING |
| A type of drilling process by which a hole is made larger. |
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| REINFORCEMENT |
| Crane rail is the track for running a traveling crane. Steel bars or welded mesh placed to reinforce concrete. |
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| RESIDUAL STRESS |
| Stresses that are generated and exist in a section due to a manufacturing process. |
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| RESISTANCE |
| The capacity of members to resist an action. (See also, Moment of Resistance.) |
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| RIDGE ROOF |
| Junction of roof slopes at the apex of a pitched roof. |
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| RISE |
| Increase in height per unit length of a roof. |
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| RESTRAINT |
| Lateral restraint of a beam is that which prevents the lateral movement of the compression flange of a beam. Torsional restraint is that which prevents rotations of a section about its longitudinal axis. Lateral restraint of a column is that which prevents movement of the compression member in a particular plane. |
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| ROD |
| A length of solid round steel of small diameter. |
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| RIGID FRAME |
| An indeterminate plane frame consisting of members with fixed end connections. |
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| ROOF |
| The cladding envelope and structure above eaves level of a building. |
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| ROOT RUN |
| The first layer of a weld. |
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| ROLLING SECTIONS |
| Mechanical process for producing finished shapes by passing steel billets through a system of rolls. |
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| RSJ |
| Rolled steel joist |
