What is the minimum factor of safety against overturning for marine structures?

1.5 for normal operating conditions, though it may be reduced for extreme, transient load combinations like seismic events.

What concrete cover is recommended for piles in a marine environment?

Typically 75 mm for the splash zone and zones exposed to severe corrosion to protect the reinforcement.

Are permissible stresses allowed to be increased for marine structures?

Yes, permissible stresses in steel and concrete can be increased by specified percentages when accounting for transient loads like wind, wave, or earthquake forces.

IS 4651 Part 4

: 1989

Planning and Design of Ports and Harbours - Wharves and Jetties

CurrentSpecializedCode of PracticeBIMStructural Engineering · Coastal and Marine Engineering

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Provides general design considerations, stability criteria, allowable stresses, and material durability requirements for the structural design of port and harbour facilities like wharves and jetties.

Lays down the criteria for the design and construction of wharves and jetties in ports and harbours.

Quick Reference Values

minimum factor of safety against sliding1.5 under normal loads

minimum factor of safety against overturning1.5 under normal loads

minimum clear cover in splash zone75 mm

minimum clear cover in submerged zone50 mm

factor of safety for deep slip circle failure1.5

Practical Notes

Special attention must be given to the 'splash zone' where alternate wetting and drying accelerates chloride-induced corrosion.

Concrete cover and grade requirements in this code often supersede standard terrestrial building codes due to the harsh saline environment.

Fenders and mooring accessories must be integrated into the structural model early to safely transfer concentrated berthing forces.