Section 5 Weather decks
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules for the Classification of Trimarans, July 2022 - Volume 1 Regulations and Structural Arrangements - Part 5 Environmental Loads - Chapter 5 Local Design Loads - Section 5 Weather decks

Section 5 Weather decks

Parent topic: Chapter 5 Local Design Loads

5.1 Weather and exposed deck pressure

5.1.1 The design pressure acting on weather decks, exposed decks or decks designed for prolonged immersion, P des, is to be taken as specified in Table 5.5.1 Weather and exposed deck pressure distribution and illustrated in Figure 5.5.1 Weather and exposed deck pressure variation with height.

Table 5.5.1 Weather and exposed deck pressure distribution

Vertical location, i.e. z value P des kN/m2
At z = T x + z k P hyd
At z = T x + z k + 0,5H w P d
At z = T x + z k + H w P d
At z = T x + z k + 1,5H w P d

Note Pressure values at other z values to be determined by linear interpolation.

Figure 5.5.1 Weather and exposed deck pressure variation with height

5.1.2 If the Complementary Rules are the Rules for Naval Ships types NS2 and NS3, then for weather and exposed decks designed to carry cargo or heavy equipment, the design pressure is to be taken as the greater of that specified in Table 5.5.1 Weather and exposed deck pressure distribution and Vol 1, Pt 5, Ch 3, 5.4 Loads for decks designed for cargo or heavy equipment loads, Pcd and Wcd of the Rules for Naval Ships.

5.1.3 If the Complementary Rules are the Rules for Special Service Craft, then for weather and exposed decks designed to carry cargo or heavy equipment, the design pressure is to be taken as the greater of that specified in Table 5.5.1 Weather and exposed deck pressure distribution and Pt 6, Ch 3, 8 Deck structures of the Rules for Special Service Craft.

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