Permissible Differential Settlements and Tilt (Angular Distortion) for Shallow Foundation in Soil (As Per IS 1904 – 1986)
| SL. NO. |
Type of Structure |
Sand & Hard Clay |
Plastic Clay |
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|
Max. Settlement |
Differential Settlement |
Angular Distortion |
Max Settlement |
Differential Settlement |
Angular Distortion |
||
| 1 | For steel structure |
50 |
0.0033*L |
1/300 |
50 |
0.0033*L |
1/300 |
| 2 | For reinforced concrete Structure |
50 |
0.0015*L |
1/666 |
75 |
0.0015*L |
1/666 |
| 3 | For multi-storeyed buildings a).RC/Steel framed buildings with panel walls |
60 |
0.002*L |
1/500 |
75 |
0.002*L |
1/500 |
b).For load bearing wall i). L/H = 2+ |
60 |
0.0002*L |
1/5000 |
60 |
0.002*L |
1/5000 |
|
| ii). L/H = 7+ |
60 |
0.0004*L |
1/2500 |
60 |
0.0004*L |
1/2500 |
|
| 4 | For water tower/ silos |
50 |
0.0015*L |
1/666 |
75 |
0.0015*L |
1/666 |
L – Denotes the length of deflected part of wall/raft or centre-to-centre distance between columns.
H – Denotes the height of wall from foundation footing.
For intermediate ratios of L/H, the values can be interpolated.