IS 9527:1974 (Part 1) is the Indian Standard (BIS) for design and construction of port and harbour structures, part 1: concrete monoliths. This code of practice outlines the design and construction procedures for concrete monoliths used in port and harbour structures. It covers aspects like material selection, design loads, stability analysis (overturning and sliding), and construction methodologies including casting, sinking operations, and hearting (filling).
Code of practice for design and construction of port and harbour structures, Part 1: Concrete monoliths
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Design Philosophy | Permissible Stress Design (ASD) | Limit State Design (LSD) / Performance Based Design | BS 6349-2:2019 |
| Factor of Safety against Sliding (Typical) | ≥ 1.5 | Verified using partial factors on actions and resistances (e.g., GEO and STR limit states). No single F.S. is specified. | BS 6349-2:2019 / Eurocode 7 |
| Factor of Safety against Overturning (Typical) | ≥ 1.5 (or resultant within middle-third of base) | Verified by ensuring equilibrium using partial factors on stabilizing and destabilizing actions (EQU limit state). | BS 6349-2:2019 / Eurocode 7 |
| Concrete Cover (Severe Marine Splash Zone) | ~40-50 mm (based on referenced codes of the era) | ≥ 60 mm + Δc (allowance for deviation), depending on concrete grade and design life. | BS 6349-2:2019 referencing BS 8500 |
| Wave Force Calculation | General mention, recommends methods like Molitor's formula (Clause 4.5). | Recommends advanced methods like the Goda formula for composite breakwaters and caissons. | OCDI-2009 |
| Design Life | Not explicitly defined as a primary design parameter. | Typically specified upfront, e.g., 50 or 100 years, and directly influences durability and material choices. | BS 6349-2:2019 |