AISC LRFD 1.pdf

52 GENERAL PROVISIONS [Sect. J1.shall be used instead of curb level. It is permissible to exclude penthouses in computingthe height of the structure.J2. WELDSAll provisions of AWS D1.1, apply under this specification, except the provisionsapplicable to Tubular Structures, which are outside the scope of this specification,and except that the provisions of the listed AISC LRFD Specification Sectionsapply under this Specification in lieu of the cited AWS Code provisions as follows:AISC Specification Section J1.5 and J1.6 in lieu of AWS D1.1 Section 5.17AISC Specification Section J2.2 in lieu of AWS D1.1 Section 2.4.1.1AISC Specification Table J2.5 in lieu of AWS D1.1 Table 2.3AISC Specification Table A-K3.1 in lieu of AWS D1.1 Section 2.27.1AISC Specification Section K3 and Appendix K3 in lieu of AWS Section 2,Part CAISC Specification Section M2.2 in lieu of AWS Sections 5.15.1.2, 5.15.4.3 and5.15.4.4The length and disposition of welds, including end returns shall be indicated on thedesign and shop drawings.1. Groove Welds1a. Effective AreaThe effective area of groove welds shall be considered as the effective length of thewelds times the effective throat thickness.The effective length of a groove weld shall be the width of the part joined.The effective throat thickness of a complete-joint-penetration groove weld shall bethe thickness of the thinner part joined.The effective throat thickness of a partial-joint-penetration groove weld shall be asshown in Table J2.1.The effective throat thickness of a flare groove weld when flush to the surface of abar or 90º bend in formed section shall be as shown in Table J2.2. Random sectionsof production welds for each welding procedure, or such test sections as may berequired by design documents, shall be used to verify that the effective throat isconsistently obtained.Larger effective throat thicknesses than those in Table J2.2 are permitted, providedthe fabricator can establish by qualification the consistent production of such largereffective throat thicknesses. Qualification shall consist of sectioning the weldnormal to its axis, at mid-length and terminal ends. Such sectioning shall be madeon a number of combinations of material sizes representative of the range to be usedin the fabrication or as required by the designer.1b. LimitationsThe minimum effective throat thickness of a partial-joint-penetration groove weldshall be as shown in Table J2.3. Weld size is determined by the thicker of the twoparts joined, except that the weld size need not exceed the thickness of the thinnestpart joined, even when a larger size is required by calculated strength. For thisLRFD Specification for Structural Steel Buildings, December 27, 1999AMERICAN INSTITUTE OF STEEL CONSTRUCTION