Code of practice for the planning and design of ports, harbours, and related marine structures. It spans multiple parts covering site considerations, earth pressures, loading (including berthing and mooring forces), general design, and layout requirements. (Note: Railway bridge loads are governed by IRS Bridge Rules, not IS 4651).
Provides detailed provisions for specific loads and stresses, including dead load, live load, impact, wind, and temperature effects for railway bridges.
Quick Reference Values
approach velocity0.15 to 0.50 m/s depending on ship size and exposure
bollard pull100 kN to 1500 kN based on vessel displacement
live load general cargo25 to 50 kN/m2 on wharves
added mass coefficient Cm1.3 to 1.8 depending on under keel clearance
Key Formulas
E = (W * V^2 / 2g) * Cm * Ce * Cs * Cc — Berthing kinetic energy of vessel
Practical Notes
Always account for the added mass of water (Cm) when calculating berthing energy, as it significantly increases the total kinetic energy.
Fender systems must be carefully selected to absorb the calculated berthing energy without exceeding the permissible reaction forces on the substructure.
Ensure adequate concrete cover and use corrosion-resistant materials due to the highly aggressive marine environment.