FCAB Rules 45Chapter IV · Structural Materials and Control
Section 45 · Thickness of walls. Sections 43(2) 57(2)(m)
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- Where walls of buildings are constructed of bricks, stones,blocks or of other hard and incombustible material on horizontal beds of courses, every wall or part of a wall shall be so designed and constructed as to be capable of safely sustaining and transmitting the dead loading and the superimposed loading to which it may be subjected, calculated in accordance with Schedule II appended to these rules so far as it is applicable and the horizontal and inclined forces to which it may be subjected without undue settlement or deflection and without exceeding the intensity of pressure on the materials as given hereunder:-Maximum permissible uniformly distributed compressive stresses on walls with slenderness ratio of unity.
Explanation :- Average crushing strength of individual burnt bricks when determined by standard test approved by the Public Works Department should not be less than 105kg/square centimetre. Allowable stress can be increased by 20 per cent in the case of local loadings.For occasional loads such as wind and earthquakes the allowable stress can be increased by 33 per cent.When sheering or tensile stress occurs the permissible stress to be taken as one tenth of the maximum pressure figures given above.
| Cement | Line | Sand | Maximum stress in kg/ square centimetrecorresponding to bricks or crushing strength in Kg./squarecentimetre. | |||
| 35 | 70 | 105 | ||||
| 1 | .. | 3 | 3.5 | 7 | 10.5 | |
| 1 | .. | 4 | 3.5 | 7 | 10.0 | |
| 1 | 1 | 6 | 3.5 | 7 | 10.0 | |
| 1 | 2 | 9 | 3.5 | 5.5 | 8.5 | |
| 1 | .. | 6 | 3.5 | 5.5 | 5.5 | |
| 1 | 6 | 6 | 3.5 | 5.5 | 8.5 | |
| 1 | 3 | 12 | 2.5 | 5 | 7.0 | |
| -- | 1 | 2 | 2.5 | 5 | 7.0 | |
| -- | 1 | 1.5 | 2.5 | 4 | 5.5 |
| Burnt bricks in mud motors | 3 |
| Coursed rubble masonry (other than Ashler) in cement mortar(1:4) | 10 |
| Coursed rubble masonry (other than Ashler) in lime mortar 1:2or cement mortar 1:6 | 5 |
| Random rubble masonry in cement mortar 1:4 | 9 |
| Random rubble masonry in line mortar 1:2 or cement mortar 1:6 | 4.5 |
| Ashler masonry in cement mortar 1:3 with 1:3:6 mass concretebacking | 13 |
| Ashler masonry in line mortar 1:2 or cement mortar 1:6 with1:4:8 mass concrete backing | 6.5 |
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