Section 14.2 Ultimate Strength of Stiffened Panels three failure types compression in flange of stiffener (negative bending moment) Mode I compression in plate (positive bending moment) Mode II tension in flange of stiffener (high positive moment) Mode III b HSF γ C := 1.5 σ C := input b p := input σ ax := σ C tp j = 5, PS 6, stiffener #6 from catalog BSF := 3.94 SDEPTH := 7.89 TSF := 0.205 TSW := .17 SCG := 5.35 a plate a := 8⋅ 12 b := 23.844 t := .375 N := 1 L := a material ⋅ υ := 0.3 E := 29.6⋅ 10 6 D := Et 3 allowing for different yield stresses 12⋅ ( 1 −υ 2 ) plate stiffener general parameters: σ Yp := 47⋅ 10 3 σ Ys := 47⋅ 10 3 HSW := SDEPTH − TSF A w := (SDEPTH − TSF) ⋅ TSW A f := BSF⋅ TSF A s := A w + A f HSW = 7.685 A w = 1.306 A f = 0.808 A s = 2.114 TSF t ⋅ A s ⋅σ Ys +σ Yp ⋅ A p d := SDEPTH − + B := (N + 1) ⋅ b A p := bt A := A s + A p σ Y_bar := A 2 2 d = 7.975 B = 47.688 A p = 8.942 A = 11.056 σ Y_bar = 47000 1 notes_31_Ult_str_stf_panels.mcd
11
Embed
Section 14.2 Ultimate Strength of Stiffened Panels · Section 14.2 Ultimate Strength of Stiffened Panels three failure types compression in flange of stiffener (negative bending moment)
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Section 14.2 Ultimate Strength of Stiffened Panels
three failure types compression in flange of stiffener (negative bending moment) Mode I compression in plate (positive bending moment) Mode II tension in flange of stiffener (high positive moment) Mode III
Convert back to untransformed geometry and corresponding stress
σ axuII(Mo) := σ axtruII(Mo)⋅ Atr
σ axuII(Mo) = −26050 A
Mo := 0, 1000 .. MP positive Mo MP = 587396.758
Mode II, figure 14.2 σ axuII(95370) = −26050
checks with PS 6 0.8
Mo 0.6
MP
0.4
0.2
0 0 0.2 0.4 0.6 0.8
− σaxuII( Mo) σYp
appropriate partial safety factor, PCSF2:
σ axRPCSF2(Mo) :=
σ axuII(Mo) γRPCSF2(Mo) := γC⋅RPCSF2(Mo)
6 notes_31_Ult_str_stf_panels.mcd
σaxtruGHneg MoG( −
σY
)
Tensile yield in flange leading to total plate plus stiffener failure; Mode III: getting relationship for intersection with plate compression failure (line GH in figure 14.2):
MoG := 1 for number check
For line GH at point G:
2⋅
λGH := ⋅
a ⋅
σ Ys
E δoG(MoG) :=
5 MoG⋅a η pGH := ∆p⋅
yftr η GH(MoG) :=
(δoG(MoG) + ∆)⋅yftr π ρtr 48⋅E⋅I ( )2
ρtr ρtr ( )2
λGH = 0.444 δoG(MoG) = 4.856 × 10− 7 η pGH = −0.303 η GH(MoG) = −0.112