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Why is double cover butt joint preferred over single cover butt joint or lap joint?(a) bolts are in single shear(b) eliminates eccentricity(c) bending in bolts(d) shear force is not transmittedThe question was posed to me in an international level competition.Origin of the question is Simple Connections topic in section Bolted Connections of Design of Steel Structures

Answer»

Correct option is (b) ELIMINATES eccentricity

To elaborate: Double cover butt joint preferred over single cover butt joint or lap joint because (i) eccentricity of load is eliminated, hence no BENDING in bolts, (II) total shear force to be transmitted is split into two parts, hence bolts are in double shear. Shear CAPACITY of double cover butt joint is double the shear capacity of single cover butt joint or lap joint.



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