5 Loads on Non-Exposed Decks and Platforms

5.1 Application

5.1.1 General

The loads defined in [5.2] and [5.3] are applicable to non-exposed decks, accommodation decks and platforms.

5.2 Pressure due to distributed load

5.2.1 If a distributed load is carried on a deck, the static and dynamic pressures due to this distributed load are to be considered.

The static distributed load is to be defined by the designer without being less than 3 kN/m² for accommodation decks and 10 kN/m² for other decks and platforms.

The pressure P_dl, in kN/m², due to this distributed load for the static (S) design load scenarios, given in Ch 4, Sec 7, is to be taken as:

P_dl = P_{dl – s}

The pressure P_dl, in kN/m², due to this distributed load for the static plus dynamic (S+D) design load scenarios, is to be derived for the envelope of dynamic load cases and is to be taken as:

P_dl = P_{dl – s} + P_{dl – d} but not less than 0.

where:

P_dl-s : Static pressure, in kN/m², due to the distributed load.

P_dl-d : Dynamic pressure, in kN/m², due to the distributed load, in kN/m², to be taken as:

a_z-env : Envelope of vertical acceleration, in m/s², at the load position being considered, for the dynamic load cases, given in Ch 4, Sec 3, [3.3.3].

5.3 Concentrated force due to unit load

5.3.1 If a unit load is carried on an internal deck, the static and dynamic forces due to the unit load carried are to be considered. when a direct analysis is applied for stiffeners or primary supporting members such as in Pt 1, Ch 6, Sec 5 [1.2] or Pt 1, Ch 6, Sec 6 [3.3] respectively.

The force F_U, in kN, due to this concentrated load for the static (S) design load scenarios, given in Ch 4, Sec 7, is to be taken as:

F_U = F_{U – s}

The force F_U, in kN, due to this concentrated load for the static plus dynamic (S+D) design load scenarios, is to be derived for the envelope of dynamic load cases and is to be taken as:

F_U = F_{U – s} + F_{U – d} but not less than 0.

m_U : Mass of the unit load carried, in t.

a_z-env : Envelope of vertical acceleration, in m/s², at the centre of gravity of the unit load carried for the dynamic load cases, given in Ch 4, Sec 3, [3.3.3].