Section 1 General
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Offshore Units, July 2022 - Part 9 Concrete Unit Structures - Chapter 3 Structural Design - Section 1 General

Section 1 General

Parent topic: Chapter 3 Structural Design

1.1 Structural design

1.1.1 The hull structure is to be capable throughout its design life, including construction and transit conditions, of withstanding all anticipated loads and deformations, both static and dynamic, with an adequate level of safety.

1.1.2 All relevant loads as defined in Pt 9, Ch 2 Loads and Load Combinations and Pt 4, Ch 3 Structural Design, Pt 4, Ch 5 Primary Hull Strength and Pt 4, Ch 10 Steering and Control Systems are to be considered and the effects of partial and/or non homogeneous loading in oil bulk storage tanks are to be considered.

1.2 Symbols

1.2.1 The symbols used in the various formulae in this Chapter are defined as follows:
= area of concrete section
= area of tension reinforcement
b = width of member
= width of the section at the centroid of the tension steel
d = effective depth
= effective tension zone (1,5 x cover + 10 bar diameters)
= short-term elastic modulus of concrete
= modulus of elasticity for steel
= characteristic compression strength of concrete, based on cube tests
= characteristic strength of pre-stressing tendon
= characteristic tensile strength of the concrete
= mean tensile strength of the concrete
= characteristic tensile strength of reinforcement steel
h = overall depth of the member
w = water pressure in cracks
x = depth of neutral axis
= partial safety factor for load
= partial safety factor for strength of materials
= strain at the level considered, calculated ignoring the stiffening effect of the concrete in the tension zone
= average strain at the level where cracking is being considered.
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