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ASME AG-1-2003 pdf download

AA-D-3100 INTRODUCTION The methods presented in this article are suggested means of approach for analysis of rectangular ductwork. The presence of compressive loads due to pressure or external forces requires that the ductwork and sup- ports be designed properly for these loads. Buckling is the major concern in the design of rectangular ductwork and is the governing failure mode to be considered in design. The advantage ofusing rectangular ductwork is that it exhibits significant post-buckling strength. Plates possessing this behavior can accept significant amounts of load after they have exceeded the elastic buckling load. The methods contained in this article, or other sources may be used. However, the requirements of Article SA-4000 must be met. AA-D-3200 RECTANGULAR DUCT ANALYSIS Properties of sections (cross-sectional area, moment of inertia, section modulus, radius of gyration, etc.) shall be determined in accordance with conventional methods of structural design. Properties shall be based on the full cross section of the members (or net sections where applicable) except where the use of a reduced cross section, or effective design width, is required by the provisions of the American Iron and Steel Institute’s (AISI) Specification for the Design of Cold-Formed Steel Structural Members [see Article AA-D-5000 (Specifications for the Design of Cold-Formed Steel Structural Members)]. Use of AISI Specification provisions, however, with the specified maximum effective design widths and heights (w/t and h/t ratios where w and h are the width and height of the duct respectively), may result in duct thicknesses in excess of those commonly used for ductwork constructed to, or similar to, SMACNA specifications. Tests performed have demonstrated that  ducts constructed to SMACNA specifications can ade- quately withstand specified dynamic loads. In effect, the following options may be utilized to calculate properties of ductwork sections. (a) AISI specifications (b) Testing as permitted by the AISI specification (c) Finite element models using large displacement criteria Option (c) can be used to extend the range of applicablility of the AISI equations and/or arrive at other suitable provisions in place of the AISI provisions. In addition, these models can be used to develop values for pressure-induced stresses not readily covered by the AISI provisions.
RA-6131.2 Responsibility. Each Manufacturer is responsible for the welding and brazing done by his organization and shall conduct the tests required by this subparagraph to qualify the procedures used in the construction of the weldments and brazed joints built under this Code, the performance of brazers, welders, and welding operators who apply these procedures, and the inspections required for workmanship and quality verification. RA-6131.3 Base Metal. Base metals to be joined by welding or brazing shall be one of those listed in Article RA-3000 or a combination of the base metals listed in Article RA-3000, provided the requirements of RA-6131.2 are met. RA-6132 Welding Procedures Qualification of the Manufacturer’s welding proce- dure specifications shall be in accordance with the requirements of this section and either the ASME Code, Section IX, or ANSI/AWS D1.1. Once a choice is made between Section IX or ANSI/AWS D1.1, all qualifications shall be consistent with that particular document. RA-6133 Welder and Welding Operator Qualifications RA-6133.1 Welder or welding operator qualification testing, or both, shall be performed in accordance with the ASME Code, Section IX, or ANSI/AWS D1.1. Welding of the qualification test specimens shall be performed in accordance with the Manufacturer’s weld- ing procedure specification qualified in accordance with RA-6132.

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