40182292-FEA-Hull-Structures - GUIDANCE NOTES ON FINITE ELEMENT ANALYSIS OF HULL STRUCTURES LOCAL 3D MODEL ANALYSIS DECEMBER 2004 American Bureau of

40182292-FEA-Hull-Structures - GUIDANCE NOTES ON FINITE...

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GUIDANCE NOTES ON FINITE ELEMENT ANALYSIS OF HULL STRUCTURES – LOCAL 3D MODEL ANALYSIS DECEMBER 2004 American Bureau of Shipping Incorporated by Act of Legislature of the State of New York 1862 Copyright 2004 American Bureau of Shipping ABS Plaza 16855 Northchase Drive Houston, TX 77060 USA
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ABS GUIDANCE NOTES ON FINITE ELEMENT ANALYSIS OF HULL STRUCTURES – LOCAL 3D MODEL ANALYSIS . 2004 iii GUIDANCE NOTES ON FINITE ELEMENT ANALYSIS OF HULL STRUCTURES – LOCAL 3D MODEL ANALYSIS CONTENTS SECTION 1 Local 3D Model Analysis ....................................................... 1 1 General .................................................................................. 1 3 Model ..................................................................................... 1 3.1 Watertight (WT) Structural Details ..................................... 1 3.3 Non-tight (NT) Structural Details ....................................... 1 5 Failure Criteria – Yielding ...................................................... 2 7 Failure Criteria – Fatigue ....................................................... 2 SECTION 2 Oil Carrier ................................................................................ 5 1 Global Model .......................................................................... 5 3 Transverse Web ..................................................................... 6 3.1 Transverse Web in Global Model ...................................... 6 3.3 Transverse Web in Local 3D Model (Yielding) .................. 7 3.5 Transverse Web – Bracket Toe at Location 3 (Simplified Model) ............................................................................... 8 3.7 Transverse Web – Bracket Toe at Location 3 (Detailed Model) ............................................................................. 11 3.9 Transverse Web – Bracket Toe at Locations 2 and 4 ..... 13 5 Transverse Web – Access Openings .................................. 15 7 Horizontal Girder .................................................................. 17 7.1 Global Model Analysis of Horizontal Girder ..................... 17 7.3 Local 3D Fine Mesh Model for Horizontal Girders ........... 19 7.5 Location 1: Large Opening for Inclined Ladder ............... 19 7.7 Location 2: Bracket Toes ................................................ 20 7.9 Location 3: Connection of Inner Skin and Transverse bulkhead ......................................................................... 21 7.11 Locations 4 and 5: Horizontal Girder Intersect with Longitudinal Stiffeners ..................................................... 21 9 Buttress Structures .............................................................. 22 9.1 Buttress Structure – Global Model .................................. 22 9.3 Buttress Structure – Local 3D Fine Mesh Model ............. 23 11 Vertical Stiffeners on Transverse Bulkheads ....................... 25 13 Hopper Knuckle Connection ................................................ 29 13.1 Hopper Knuckle Connection Model with Mesh Size 1/4 Sp ....................................................................... 31
iv ABS GUIDANCE NOTES ON FINITE ELEMENT ANALYSIS OF HULL STRUCTURES – LOCAL 3D MODEL ANALYSIS . 2004 13.3 Hopper Knuckle Connection Model with Mesh Size 1/8 Sp ........................................................................ 32 13.5 Hopper Knuckle Connection Model with Mesh Size 1/16 Sp ...................................................................... 33 13.7 Yielding and Buckling ...................................................... 34 15 Double Bottom Floor Structures .......................................... 35 15.1 Double Bottom Floor and Web Stiffeners ........................ 35 15.3 Cutouts ............................................................................ 38 15.5 Opening on Double Bottom Floor .................................... 41 17 Tripping Bracket ................................................................... 42 FIGURE 1 Global Frame Arrangement ......................................... 5 FIGURE 2 Transverse Web – Global Model ................................. 6 FIGURE 3 Transverse Web ........................................................... 7 FIGURE 4 Radii and Web Depth of Lower Web and Openings .... 8 FIGURE 5 Bracket Toe – Simplified Fatigue Model ...................... 9 FIGURE 6 Stress Distribution and Dynamic Stress Range ......... 10 FIGURE 7 Bracket Toe – Detailed Model .................................... 11 FIGURE 8 Type A – One Large Radius ...................................... 12 FIGURE 9 Type B – Two Small Radii .......................................... 12 FIGURE 10 Stress Distributions of Bracket with Different Curvatures .................................................................. 13 FIGURE 11 Transverse Web – Bracket Toe at Locations 2 and 4 ....................................................................... 14 FIGURE 12 Access Openings ....................................................... 15 FIGURE 13 Stress Distribution for Access Openings with and without Reinforced Web Stiffeners ............................. 16 FIGURE 14 Horizontal Girder – Global Model ............................... 17 FIGURE 15 Horizontal Girder – Fine Mesh Model ........................ 18 FIGURE 16 Typical Critical Locations ........................................... 19 FIGURE 17 Large Opening for Inclined Ladder and Stress Distribution ................................................................. 20 FIGURE 18 Bracket Toes .............................................................. 20 FIGURE 19 Intersection with Longitudinal Stiffeners .................... 21 FIGURE 20

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