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Published byKareem Brumby Modified about 1 year ago

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W-29 Eccentric shear welded connection are popular for column brackets supporting gantry crane loadings or mezzanine floors. The connection below produces (shear + torsion) on the weld. The LRFD method for (shear + torsion) is both difficult and lengthy, A more conservative “elastic vector analysis” method is allowed by AISC:

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W-30 The eccentric load is transferred to the “centroid” of the weld group. The transferred load shall consist of a load plus a moment (M z = P·e), where: e = eccentrity. The actual weld thickness resisting shear and torsion forces is (0.707w), but for simplicity, we consider effective throat thickness = 1.0 inch. From direct shear only (due to P):- 1 inch PyPy PxPx P M=P·e

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W-31 The transferred moment (M) causes additional shear stresses depending on the critical locations of the weld (far edges of the weld). where: M = moment due to eccentricity = (P.e) d = distance to far this weld point J = Polar moment of inertia. where: This can be vector analyzed to:

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W-32 O nce these four stress components are evaluated for an extreme point of the weld. They can be added vectorially: Then the strength of 1 inch wide weld is evaluated as: F v = w x 1 x (0.6 F EXX )

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W-33 Example W-6 Determine the size of the weld required for the bracket shown. A-36 steel is used, SMAW process? Solution:

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W-34 Example (W-6) - Continued By inspection points (A $ B) are more critical than points (B & C); Take point (A):

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W-35 Select E70XX as given by matching table. Use ½ inch weld size Example (W-6) - Continued

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