Question:easy
The maximum spacing of longitudinal bars measured along the periphery of a column is
The maximum spacing of longitudinal bars measured along the periphery of a column is
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As per IS 456:2000,
\[
\boxed{
\text{Maximum spacing of longitudinal bars}
=
300\,\mathrm{mm}.
}
\]
Updated On: Jul 23, 2026
- \(300\,\mathrm{mm}\)
- \(150\,\mathrm{mm}\)
- \(450\,\mathrm{mm}\)
- \(200\,\mathrm{mm}\)
Show Solution
The Correct Option is A
Solution and Explanation
Step 1: Why this rule exists.
In an RCC column every vertical bar has to be held in place by the lateral ties so it cannot buckle outward under load. If two neighbouring longitudinal bars are placed too far apart along the periphery, the concrete cover between them can bulge or spall off before the tie gets a chance to restrain it.
Step 2: The limit fixed by the code.
To avoid this, IS 456:2000 caps the spacing between two consecutive longitudinal bars measured along the column periphery at $s_{max}=300\,\text{mm}$. Any spacing beyond this is not allowed regardless of the column size.
Step 3: Matching with the choices.
Checking the given values, only $300\,\text{mm}$ agrees with this code limit while $150\,\text{mm}$, $200\,\text{mm}$ and $450\,\text{mm}$ do not.
\[ \boxed{300\,\text{mm}} \]
In an RCC column every vertical bar has to be held in place by the lateral ties so it cannot buckle outward under load. If two neighbouring longitudinal bars are placed too far apart along the periphery, the concrete cover between them can bulge or spall off before the tie gets a chance to restrain it.
Step 2: The limit fixed by the code.
To avoid this, IS 456:2000 caps the spacing between two consecutive longitudinal bars measured along the column periphery at $s_{max}=300\,\text{mm}$. Any spacing beyond this is not allowed regardless of the column size.
Step 3: Matching with the choices.
Checking the given values, only $300\,\text{mm}$ agrees with this code limit while $150\,\text{mm}$, $200\,\text{mm}$ and $450\,\text{mm}$ do not.
\[ \boxed{300\,\text{mm}} \]
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