剖面模数计算方法
革命军人个个要牢记Allowable stress to ABS MODU 2001, part 3, charpter 2, section 1, item 3.3
F=Fy/F.S., where
Fy = 235 N/mm2 , or 34 ksi
F.S. =      1.67 for axial or bending stress
2.50  for shear stress
Hence,            F =        140.7 N/mm2 , or    20.4 ksi  for axial or bending stress
94.0 N/mm2 , or    13.6 ksi  for  shear stress
1. Bulkhead
1.1 Wind pressure p = f V k
2.c h.c s  N/m2where
f = 0.611
Vk = 100 knots = 51.44 m/s
c s = 1.0
c h = 1.1关心人的话
hence p = 1778.4  N/m2or  37.13 lbf/ft2
净水器前十名1.2 Bulkhead plating
Plate panel maximum size (mm)4070  by  690
Plate thickness, t (mm)8
Bulkhead load to wind pressure  p = 1778.4  N/m2or  37.13 lbf/ft2
Stress due to lateral perpendicular load:σ = kpb2/t2        where
k = 0.741 for panel size ratio of 5.9 (4070/690)8月开什么花
p =37.13lbf/ft2, or0.26 lbf/in2
b =690 mm
t  =8mm
Henceσ =1421  lbf/in2,  or  1.42ksi  OK
3
Shear stress at support,τ = RF max/A web =  4.49N/mm2, or0.7ksi  OK
2. Bottom
2.1. bottom plating
Plate panel maximum size (mm)2650  by  830
Plate thickness, t (mm)8
Deck load to MODU 2001, w920 kgf/m2, or  188 lbf/ft2
Stress due to lateral perpendicular load:σ = kwb2/t2        where
k = 0.718 for panel size ratio of 3.19 (2650/830)
w =188lbf/ft2, or  1.31 lbf/in2
b =830mm
t  =8mm
Henceσ =10090  lbf/in2,  or10.1ksi  OK
3
中元节的习俗
3. APV'  lower Supporting Structure
As per contract specification 2.22G, foundations for equipment shall be designed for combined static
and dynamic load of 1.5g vertical and 0.5g horizontal for roll and pitch.
According to HYDRALIFT Drawing: T2820-D1157-G0040  APV's arrangement,
per WORKING APV' average weight: 2750kg,
add 10% variables: 3025kg is to be used in following calculation.
除甲醛比较好的品牌3.1  check supporting plate panel
The supporting plate panel, which is supported at four sides, is considered conservatively as plate beam supported at two longer edges.
Plate panel concentrated load maximum size (mm)1420  by  760
Plate thickness,    t (mm) =25.5
Deck load to MODU 2001,      w =920kgf/m2, or    188 lbf/ft2
Max moment due to deck load q:          M q =qL/8 =925N.m
where L =0.76m
Max reaction force due to deck loa R q=qL/2=4870N
Load Case 1 (LC1):  Heave at 1.5g
Force due to static and dynamic load:P = ma,where
m=3025kg
a=14.7m/s2 (1.5g)
P=44467.5N
Hence,Q=2P = 88935N
M1max=Ql1l2/L=16605N.m
where L=0.76m
l1=0.33m
l2=0.43m
R1max=Ql2/L=50318N

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