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Why is double cover butt joint preferred over single cover butt joint or lap joint?

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in Design of Steel Structures by (962k points)
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 transmitted

The 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

1 Answer

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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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