IS 4995:1974 is the Indian Standard (BIS) for criteria for design of berthing structures. This standard provides criteria for the design of reinforced concrete bins used for storing granular and powdery materials. It specifies methods for calculating pressures exerted by the stored material using Janssen's theory and provides characteristic properties for various materials. The standard also covers structural design considerations, referencing IS 456 for concrete design.
Specifies criteria for the design of structures for berthing ships, including fender systems and mooring arrangements.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Design Philosophy | Working Stress Method (WSM) | Limit State Design (LSD) / Load and Resistance Factor Design (LRFD) | BS 6349-2:2010 |
| Live Load / Surcharge (General Cargo) | 1.0 t/m² (approx. 10 kN/m²) | Typically 20-30 kN/m² (e.g., 25 kN/m² is common) | BS 6349-2:2010 |
| Berthing Velocity (Example: 50,000 DWT, normal conditions) | 15-25 cm/s, based on exposure (Table 1) | Calculated based on charts/formulas considering tug assistance and approach angle; typically 12-18 cm/s. | PIANC Guidelines |
| Hydrodynamic Mass Coefficient (Cm) | Cm = 1 + 2T/B (where T=draft, B=beam) | Formula-based (e.g., Vasco Costa's) or recommended values, typically between 1.4 and 1.8 depending on under-keel clearance. | BS 6349-2:2010 |
| Bollard Capacity (Example: 60,000 DWT vessel) | 100 tonnes (from Table 2) | Derived from calculated wind/current loads; typically in the range of 100-150 tonnes. | UFC 4-152-01 |
| Load Combination with Berthing Load (Accidental) | Permissible stresses may be increased by 25% (WSM) | Load factor on accidental berthing action is 1.0 at Ultimate Limit State (ULS) | BS 6349-2:2010 |