Test: Structural Fasteners - 1 - Civil Engineering (CE) MCQ

Maximum pitch of rivets in tension = 16t or 200 mm whichever is less,
∴ Pitch = 16 x 10 = 160 mm

Gross diameter
= Nominal diameter + 1.5 mm, φ≤ 25 mm
Gross diameter
= Nominal diameter + 2 mm, φ > 25 mm φ =  Nominal diameter

According to Unwin’s formula nominal diameter of rivet is given by,

Maximum pitch of rivets in compression = 12t or 200 mm whichever is less

In the case of double cover butt joint, eccentricity of force does not exist and bending is eliminated whereas it exists in the case of lap joint.

Possible failures of Bolted connection:

1. Tension failure of plate

2. Bearing failure of bolt

3. Shear failure of bolt

4. Shear failure of plate

5. Splitting failure of plate

6. Bearing failure of plate

Out of the above given failures, the last three failures i.e. shear failure, splitting failure and bearing failure of plate are occurred due insufficient end distance and can be prevented by providing proper end distance. For the first 3 failures, we need to design bolted connection.

The distance between centres of two adjacent rivets, in a line lying in the direction of stress, shaff not exceed 16t or 200 mm, whichever is less in tension members and 12t or 200 mm, whichever is less in compression member
∴ c/c distance = Lesser of (16 x 10, 200) 
= 160mm.

The axial force from column needs to be transferred from column to footing and thus, mainly type of stress induced in the foundation bolts is pure tension.