Welcome to the Spreadsheet for Linear Buckling Analysis of Stiffened Plate Panels (as per DNV RP-C-201)

Transcription

1 Welcome to the Spreadsheet for Linear Buckling Analysis of Stiffened Plate Panels (as per DNV RP-C-201) What does this spreadsheet do? Performs linear buckling analysis of stiffened plate panels according to Part-1 of DNV-RP-C201 Also performs yield check for laterally loaded panels (Sec. 5 of RP-C201) and using von-mises stress criteria (DNV-OS-C-101) Valid for stiffened plate panels with continuous stiffeners Valid for L and T sections (Bulb sections need to be converted to equivalent angle sections) How to use this Excel Sheet The user is asked for some inputs for the Panel Stiffener geometry, material and loads. The Input cells are highlighted in blue in the Worksheet "Input - Panel Geom. and Loads" Once all inputs are provided, the intermediate calculations like Stiffener properties, effective plate width, characteristic buckling strength etc are calculated in the Worksheet "Intermediate Calculations" The Output results: IR Lateral Pressure on Plate Side and IR Lateral Pressure on Stiffener Side are shown in the Worksheet "Output - IRs and Yield Check" User should not make any changes to Output cells To convert a Bulb section to its equivalent Angle section, the Worksheet "Bulb_to_angle" can be used References DNV RECOMMENDED PRACTICE DNV-RP-C201 BUCKLING STRENGTH OF PLATED STRUCTURES, Part 1, Oct 2010 DNV OS-C-101 DESIGN OF OFFSHORE STEEL STRUCTURES, GENERAL (LRFD METHOD),2011 Sign convention: Tensile - Compression + Pressure on plate side + Color code: Input Intermediate calculations Result

2 Instructions: Please input the Panel/Stiffener Geometry, Loads and Materials. For explanations, see the comments For bulb sections, please input the geometry of equivalent Angle section. Convert Bulb to Equivalent Angle T-section Angle-section Bulb Section Fig 1: Stiffener Geometry Panel Geometry Stiffener Geometry (Input equivalent angle section in case of bulb) Panel Material Panel Loads PanelID l (mm) s (mm) t (mm) L G (mm) Stiffener type hw tw bf tf E (MPa) G (Mpa) f y (Mpa) γ M σ x,sd (MPa) σ y1,sd (MPa) σ y2,sd (MPa) τ sd (MPa) p sd (MPa) z* (mm) M 1,Sd Unequal spans M 2,Sd Unequal spans Panel Bulb Panel Bulb Panel Angle Panel Angle

3 Stiffener properties Forces in the idealised stiffened plate Panel ID Aw (mm 2 ) Af (mm 2 ) As (mm 2 ) z p (mm) z t (mm) z fullwidth (mm) I s (mm 4 ) I e (mm4) W es (mm 3 ) Z vertaxis (mm) Iz (mm 4 ) k g τ crg (MPa) k l τ crl (MPa) τ tf ψ mc kc C0 p0 q Sd N sd Panel Panel Panel Panel

4 Calculation of Effective Plate Width Characteristic Buckling Strength of Stiffeners Characteristic Buckling Strength of Stiffeners Characteristic Buckling Strength of Stiffeners λp C xs Ci h α kp λc μ k σ y,r C ys Se f Epx f Epy f Ept σ j,sd c 2 λ e f ep η C β f ET λ T μ f T Ae i e Wep W p f l k f E

5 fr plateside fr stiffside f k plateside f k stiffenerside τ Rdy τ Rdl τ Rd M s1,rd M s2,rd N E u N kp,rd M p,rd M st,rd Characteristic Buckling Strength of Stiffeners Resistance of Stiffened Panels to Shear Stress IR Formulae for Axial Compression and Lateral Pressure Yield check for laterally loaded plates λ μ plateside μ stiffenerside Ip τ crs τ Rds N Rd N ks,rd M 1,Sd M 2,Sd ψ y ψ x Lat. Pressure Allowable (MPa) von-mises (MPa)

6 IR Lateral Pressure on Plate Side IR Lateral Pressure on Stiffener Side Panel ID IR 1 IR 2 IR 3 IR 4 IR 5 IR 6 IR 7 IR 8 Yield check Sec 5 Yield check DNV-OS-C101 Panel OK OK Panel OK OK Panel OK OK Panel OK OK

7 Instructions To convert bulb to equivalent angle section, please input (in blue columns) the dimensions of the Bulb section The equivalent angle sections dimensions shall be shown under the 'Equivalent Angle' tab Bulb Equivalent Angle h'w t'w hw tw bf tf Back to Inputs

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