LR V.3 Longitudinal strength

LR V.3.1.1 The longitudinal strength standard is to comply with the relevant requirements of Pt 3, Ch 4 Longitudinal Strength*.

LR V.3.2.1 Symbols are defined in LR V.1.2 General definitions and symbols.

LR V.3.3.1 The range of loading conditions examined for longitudinal strength is to be fully representative of the cargo and ballast loading patterns which will occur in service, taking account of the relative densities of intended cargoes and also cargo segregation requirements, which may result in partial filling or non-uniform loading. The range of conditions is not, however, to be less than as provided for in Pt 4, Ch 9, 3.3 Loading conditions*.

LR V.3.3.2 In order to guard against high stresses being imposed through an unsatisfactory cargo or ballast loading, an approved instrument is to be provided for determining suitable loading, in all instances where a non-uniform load distribution may occur in service, as required by Pt 3, Ch 4, 8.3 Loading instrument*.

LR V.3.3.3 Where an approved loading instrument is provided, the conditions in the Loading Manual will be verified using the instrument, and the Manual will be endorsed to the effect that any departures from these conditions in service are also to be arranged on the basis of the loading instrument.

LR V.3.3.4 Attention is drawn to the remaining requirements of Pt 4, Ch 9, 3.3 Loading conditions*.

LR V.3.4.1 Where stainless steel, having a value of σ₁ or σ₂ less than 235 N/mm² (24 kgf/mm²), is incorporated in continuous longitudinal material in the vicinity of deck or bottom, the hull section modulus is to be not less than Z_R k ₁, or Z_R k ₂ respectively.

LR V.3.4.2 Where continuous upperdeck longitudinals or girders are fitted externally, the Rule hull modulus is to be attained at a point equivalent to the depth of longitudinal or girder above the moulded deck line at side.

LR V.3.5.1 The buckling requirements of Pt 3, Ch 4, 7 Hull buckling strength* are to be satisfied where applicable. Where stainless steel is used the buckling requirements in Pt 3, Ch 4, 7 Hull buckling strength* are to be evaluated with the standard deduction for corrosion, d _t = 0,5 mm. For clad plates the standard deduction for corrosion is to be taken as d _t = 0,5 mm for the plate side with stainless steel.