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DNV-OS-C102 Structural Design of Offshore Ships

Sec.6: Strength of Topside Structures

B: Local Static Loads

B100: Local loads on topside structures

Sec.6
B 100   Local loads on topside structures

Sec.6 B

Table B1 Local static loads
Decks	Plates and stiffeners		Girders (kN/m2)	Global design
	Evenly distributed load (kN/m2)	Point load (kN)
Storage areas in modules 1)	q	1.5 q	f ´ q	q
Lay down areas 1)	q	1.5 q	f ´ q	f ´ q
Lifeboat platforms	9.0	9.0	9.0 ´ f	-
Area between equipment	5.0	5.0	5.0 ´ f	-
Walkways, staircases and platforms, crew spaces	4.0	4.0	4.0 ´ f	-
Walkways and staircases for inspection only	3.0	3.0	3.0 ´ f	-
Minimum values for areas not given above 2)	2.5	2.5	2.5	-
The distributed loads, q, to be evaluated for each case. Lay down areas should not be designed less than 15 kN/m2. 2) The minimum values shall be determined considering the weights of the equipment and bulks, which may be located on the area. The minimum values shall not be less than 2.5 kN/m2 Notes: — wheel loads to be added to distributed loads where relevant. (Wheel loads can normally be considered acting on an area of 300 ´ 300 mm.) — point load may be applied on an area 100 ´ 100 mm, and at the most severe position, but not added to wheel loads or distributed loads — the factor f may be taken as Where, A is the loaded area in m2. — Global design presents variable functional loads to be included in the load model for the global analysis. In the capacity checks, stresses from the global analysis shall be combined with the effect of local loads, i.e. tank pressures, weight of equipments, etc.