IS 875:1987 Part 5 is the Indian Standard (BIS) for design loads (other than earthquake) for buildings and structures - special loads and load combinations. IS 875 Part 5 outlines the standard load combinations to be considered for structural design, ensuring structural stability under multiple simultaneous load actions. It also specifies how to account for special loads like temperature variations, hydrostatic pressure, earth pressure, and accidental impact.
Covers special loads like erection loads, accidental loads, and defines load combinations for structural design.
DL + IL + WL / EL load combinations, temperature, hydrostatic and earth-pressure loads for special cases.
| Reference | Value | Clause |
|---|---|---|
| Load combinations — DL + IL (working stress) | 1.0 DL + 1.0 IL | Cl. 8.1 (a) |
| Load combinations — DL + IL + WL or EL | 1.0 DL + 0.8 IL + 0.8 WL/EL | Cl. 8.1 (b) |
| Load combinations — limit state, basic | 1.5 (DL + IL) | Cl. 8.2 (Table 18 of IS 456) |
| Limit state — DL + IL + WL/EL | 1.2 (DL + IL ± WL/EL) | Cl. 8.2 |
| Limit state — DL ± WL/EL (low IL) | 1.5 (DL ± WL/EL) | Cl. 8.2 |
| Limit state — DL + WL/EL relieving | 0.9 DL ± 1.5 WL/EL | Cl. 8.2 |
| Temperature variation — typical design range | ±20 °C (mean) for India | Cl. 5.1 / IMD data |
| Coefficient of thermal expansion — concrete | 10 × 10⁻⁶ / °C | Cl. 5.2 |
| Coefficient of thermal expansion — steel | 12 × 10⁻⁶ / °C | Cl. 5.2 |
| Hydrostatic pressure — design head | Full head from HFL | Cl. 6.1 |
| Earth pressure — at-rest K0 | 1 − sin φ (≈0.4–0.5 for sand) | Cl. 7.2 |
| Earth pressure — active Ka (Rankine) | tan²(45 − φ/2) | Cl. 7.2 |
| Earth pressure — passive Kp (Rankine) | tan²(45 + φ/2) | Cl. 7.2 |
| Surcharge effect on earth pressure | Equivalent vertical pressure converted via Ka | Cl. 7.3 |
| Accidental loads — vehicle impact (typical) | Per project-specific risk study | Cl. 9.2.2 |
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Plain Cement Concrete (PCC) | 24.0 kN/m³ | 24.0 kN/m³ | EN 1991-1-1 |
| Reinforced Cement Concrete (RCC) | 25.0 kN/m³ | 25.0 kN/m³ | EN 1991-1-1 |
| Structural Steel | 78.5 kN/m³ | 78.5 kN/m³ | EN 1991-1-1 |
| Common Burnt Clay Brick Masonry | 18.85 kN/m³ | 16.0 - 20.0 kN/m³ (depending on brick density) | EN 1991-1-1 |
| Cement Plaster | 20.4 kN/m³ | 20.0 kN/m³ (for Cement mortar) | EN 1991-1-1 |
| Cast Iron | 72.08 kN/m³ | 72.5 kN/m³ | EN 1991-1-1 |
| Water (Fresh) | 9.81 kN/m³ | 10.0 kN/m³ | EN 1991-1-1 |
| Glass (Sheet/Plate) | 25.1 kN/m³ | 25.0 kN/m³ | EN 1991-1-1 |