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BASE METAL STRENGTH[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: BASE METAL STRENGTH
- From: Alan_Williams(--nospam--at)dot.ca.gov
- Date: Mon, 6 Nov 2000 07:37:29 -0800
In a recent post it was stated that incorrect values were tabulated for the minimum web thickness for fillet welds A in Table 9-4 of LRFD Volume II. These values are derived from the shear yielding strength of the base metal, as indicated on pages 9-15 and 9-16, using equation (J5-3) which specifies phi * Rn = 0.90 * 0.6 * Fy * t However, Salmon and Johnson in "Steel Structures" 4th Edition on pages 225-227 and Figures 5.14.1 and 5.14.2 evaluate the strength of the shear plane through the base metal using the shear rupture strength given by equation (J4-1) which specifies: phi * Rn = 0.75 * 0.6 * Fu * t For A36 material equation (J4-1) gives a 27 % greater value for the base material strength than equation (J5-3) and for A572 Grade 50 material equation (J4-1) gives a 8 % greater value. For comparison, the minimum web thickness values given in Table III of ASD Part 4 are based on a 13 % greater base material strength than those in Table 9-4 of LRFD Volume II. In the section titled "Base metal design strength" on page 8-129 of LRFD Volume II no mention is made of shear strength of the base metal in fillet welded joints. Table J2.5 LRFD Volume I also lacks details for shear strength of the base metal in fillet welded joints. Is there any consensus on which approach should be adopted? Alan Williams
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