AISC LRFD 1.pdf

50 GENERAL PROVISIONS [Sect. J1.tensile stresses due to tension or flexure. When the individual elements of the crosssection are spliced prior to being joined to form the cross section in accordance withAWS D1.1, Article 5.21.6, the applicable provisions of AWS D1.1 apply in lieu ofthe requirements of this section. When tensile forces in these sections are to betransmitted through splices by complete-joint-penetration groove welds, materialnotch-toughness requirements as given in Section A3.1c, weld access hole detailsas given in Section J1.6, welding preheat requirements as given in Section J2.8, andthermal-cut surface preparation and inspection requirements as given in SectionM2.2 apply.At tension splices in ASTM A6/A6M Group 4 and 5 shapes and built-up membersof material more than two in. (50 mm) thick, weld tabs and backing shall beremoved and the surfaces ground smooth.When splicing ASTM A6/A6M Group 4 and 5 rolled shapes or shapes built-up bywelding plates more than two in. (50 mm) thick to form a cross section, and wherethe section is to be used as a primary compression member, all weld access holesrequired to facilitate groove welding operations shall satisfy the provisions of SectionJ1.6.Alternatively, splicing of such members subject to compression, including memberswhich are subject to tension due to wind or seismic loads, shall be accomplishedusing splice details which do not induce large weld shrinkage strains; forexample partial-joint-penetration flange groove welds with fillet-welded surfacelap plate splices on the web, bolted lap plate splices, or combination bolted/fillet-weldedlap plate splices.6. Beam Copes and Weld Access HolesAll weld access holes required to facilitate welding operations shall have a lengthfrom the toe of the weld preparation not less than 1 1 2 times the thickness of thematerial in which the hole is made. The height of the access hole shall be adequatefor deposition of sound weld metal in the adjacent plates and provide clearance forweld tabs for the weld in the material in which the hole is made, but not less than thethickness of the material. In hot-rolled shapes and built-up shapes, all beam copesand weld access holes shall be shaped free of notches and sharp re-entrant corners,except that when fillet web-to-flange welds are used in built-up shapes, accessholes are permitted to terminate perpendicular to the flange.For ASTM A6/A6M Group 4 and 5 shapes and built-up shapes of material morethan two in. (50 mm) thick, the thermally cut surfaces of beam copes and weldaccess holes shall be ground to bright metal and inspected by either magnetic particleor dye penetrant methods prior to deposition of splice welds. If the curved transitionportion of weld access holes and beam copes are formed by predrilled orsawed holes, that portion of the access hole or cope need not be ground. Weld accessholes and beam copes in other shapes need not be ground nor inspected by dyepenetrant or magnetic particle methods.7. Minimum Strength of ConnectionsConnections providing design strength shall be designed to support a factored loadnot less than 10 kips (44 kN), except for lacing, sag rods, or girts.LRFD Specification for Structural Steel Buildings, December 27, 1999AMERICAN INSTITUTE OF STEEL CONSTRUCTION