New PDF release: AISC N690-12 Specification for Safety-Related Steel

By American Institute of Steel Construction

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Additional info for AISC N690-12 Specification for Safety-Related Steel Structures for Nuclear Facilities

Example text

No reduction in the rate of UT testing for welds subject to impactive or impulsive loads shall be allowed. 5f. Increase in Rate of Ultrasonic Examination For structures in which the initial rate for UT is 10%, the NDE rate for an individual welder or welding operator shall be increased to 100% should the reject rate, the number of welds containing unacceptable defects divided by the number of welds completed, exceed 5% of the welds tested for the welder or welding operator. A sampling of at least 20 completed welds for a job shall be made prior to implementing such an increase.

6 mm) per 50 ft (15 m) of the girder span over that indicated on the design drawings. 7c. Tolerances for Crane Rails Center-to-center distances of crane rails and the straightness of crane rails shall meet the tolerances prescribed by “Specifications for Top Running Bridge and Gantry Type Multiple Girder Electric Overhead Traveling Cranes” (CMAA-70). Vertical misalignment of crane rails measured at centerlines of columns shall meet the tolerances prescribed by CMAA-70. For polar cranes, the above tolerances shall apply except that the CMAA tolerances for crane span shall be applied for crane rail diameter.

Replace preamble with the following: This appendix addresses design by inelastic analysis, in which consideration of the redistribution of member and connection forces and moments as a result of localized yielding is permitted. 1. General Provisions Add the following as the last paragraph: When inelastic analysis is used for design, attention shall be paid to the induced deflections of the structural steel member(s), as well as to the effects of such deflections on supported components such as piping, HVAC ducts and cable trays, to ensure that the components will be able to perform their intended functions.

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AISC N690-12 Specification for Safety-Related Steel Structures for Nuclear Facilities by American Institute of Steel Construction

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