FCAB Rules 46Chapter IV · Structural Materials and Control
Section 46 · Slenderness ratio. Sections 43(2), 57(2)(m)
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- Slenderness ratio shall not exceed 12 and reduction in the permissible pressure figure given for slenderness ratio exceeding shall be carried on according to the table given below :-
Explanation :- Slenderness ratio on any storey height of a wall or a pier is the ratio of the effective storey height to the thickness of the wall. The effective height of the walls and piers shall be taken as :-
For stiffened structures the slenderness ratio shall be calculated as per specification No. 11.15 of the Punjab P.W.D. specification, 1963 Edition
| Slenderness Ratio | Reduction in maximum permissible pressure due toslenderness ratio exceeding six |
| 7 | 10% |
| 8 | 20% |
| 9 | 30% |
| 10 | 40% |
| 11 | 50% |
| 12 | 60% |
| (i) for walls with no lateral support at top | 1½ actual storey height |
| (ii) for walls with no lateral support at top | ¾ actual storey height |
| (iii) piers with no lateral support at top | 2 actual storey height |
| (iv) Piers with lateral support at top | Actual storey height |
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