Section 4 Frames

401. Scantlings of Transverse Frames

1. The section modulus of transverse frames abaft 0.15 Ã from the fore end is not to be less than ob- tained from the following formula:

Ě Ņ ĮĪĊᾜᾨĪ NcmĮ Ń

where,

Ċ : Spacing of frames (m ).

ᾨ : Vertical distance from the top of inner bottom laminates or single bottom floor at side to

the top of upper deck beams at side (m ). For frames abaft 0.25 Ã from the fore end, to be measured at midship. For frames between 0.25 Ã and 0.15 Ã from the fore end, to be measured at 0.25 Ã from the fore end.

ᾨ is

ᾨ is

ᾜ : Vertical distance from the lower end ᾘ Ñ LǾLĪĴ Ã Nm Ń above the base point of 0.5Á (m ), ᾜ is to be taken as 0.5Á (m ).

of ᾨ at the place of measurement to a point

Á (m ). Where, however, the distance is less than

2. The section modulus of transverse frames afore 0.15Ã from the fore end is not to be less than ob- tained from the following formula:

Ě Ņ ĮKǾJĊᾜᾨĪ NcmĮŃ

where,

Ċ, ᾜ and ᾨ : As specified in the preceding 1. However, ᾨ is to be measured at 0.15Ã from the fore end.

402. Side Longitudinals

1. The section modulus of side longitudinals below the upper deck for the midship part is not to be less than obtained from the following formula:

Ě Ņ ĨĶĊᾜᾨĪ NcmĮ Ń

where,

Ċ : Spacing of longitudinals (m ).

ᾜ : Vertical distance from the longitudinals to a point ᾘ Ñ LǾLĪĴ Ã Nm Ń above the base point of Á (m ). Where, however, the distance is less than 0.5Á (m ), h is to be taken as 0.5Á (m ).

ᾨ : Distance between the transverse bulkheads or where web frames are provided, distance be- tween the web frames or between the transverse bulkhead and web frame including the length of end connection (m ).

2. Beyond the midship part, the section modulus of side longitudinals may be gradually reduced to- ward the ends of ship and may be 0.85 times that obtained from the formula in the preceding 1 for the end parts. However, the section modulus of side longitudinals afore 0.15 Ã from the fore end is not to be less than obtained from the formula in the preceding 1.

403 Web Frames supporting Side Longitudinals

Where the ship's side are longitudinally flamed, web frames supporting side longitudinals are to be provided in a spacing not exceeding about 2.4 m . However, the construction and scantlings thereof are to be in accordance with the discretion of the Society.

404 Hat-type Construction

With respect to the scantlings of frames of hat-type construction, the requirements in Ch 1, 305.

in addition to the requirements in this chapter, are to be applied.