Understanding Maximum Rivet Pitch as per IS-800

The pitch of rivets is the distance between the centres of two consecutive rivets in a row, measured parallel to the direction of stress. Proper pitch is crucial in steel structures to ensure adequate load transfer and prevent buckling of the connected plates.

According to the Indian Standard code IS-800, there are specifications for both minimum and maximum pitch values for rivets (and bolts). These limits help in achieving a safe and efficient connection.

The question asks for the maximum value of rivet pitch as per IS-800.

Let's examine the options provided in relation to the IS-800 standard:

• Option 1: 32t or 200mm whichever is less
• Option 2: None of the given options
• Option 3: 32t or 300mm whichever is less
• Option 4: 32t or 350mm whichever is less

Where 't' is the thickness of the thinner plate being connected.

IS-800 Provision for Maximum Rivet Pitch

As per IS-800 (specifically the older version, IS 800:1984, which is often referenced for such details), the maximum pitch of rivets in tension or compression members is limited to 32 times the thickness of the thinner outside plate or 300 mm, whichever is less. For tacking rivets (used to hold plates together), the pitch can be larger, but for load-carrying rivets, this limit applies.

The relevant clause specifies the maximum pitch (p) as:

\( p \le \text{min}(32t, 300 \text{ mm}) \)

Comparing this standard requirement with the given options:

• Option 1: Uses 200mm as the upper limit, which is incorrect.
• Option 3: Uses 300mm as the upper limit and 32t, taking the minimum of the two, which matches the IS-800 requirement.
• Option 4: Uses 350mm as the upper limit, which is incorrect.

Therefore, the maximum value of rivet pitch, as per IS-800, is taken as 32t or 300mm, whichever is less.