Workgroup Contents

Lecture 15A.7 : Tubular Joints in Offshore Structures


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1. INTRODUCTION

2. DEFINITIONS

2.1 Geometrical definitions

2.2 Geometrical ratios

3. CLASSIFICATION

3.1 T and Y Joints

3.2 X Joints

3.3 N and K Joints

3.4 KT Joints

3.5 Limitations

3.6 How to classify a joint

4. GAP AND OVERLAP

4.1 Definitions

4.2 Limitations

4.3 Multiplanar Joints

5. JOINT ARRANGEMENT

6. STATIC STRENGTH

6.1 Loads taken into account

6.2 Punching shear

6.2.1 Acting punching shear

6.2.2 Allowable punching shear

6.2.3 The API method

6.3 Overlapping joints

6.4 Reinforced joints

6.4.1 Definition

6.4.2 Ring Stiffening

7. STRESS CONCENTRATION

7.1 Stress concentration factor

7.2 Kellog equation

7.3 Parametric formulae

7.3.1 Kuang equations for T/Y joints [4]

7.3.2 Kuang equations for K joints [4]

7.3.3 Kuang equations for KT joints [4]

8. FATIGUE ANALYSIS

8.1 Nominal stress range

8.1.1 Wave histogram

8.2.2 Nominal stress ranges

8.2 Hot spot stress ranges

8.3 S-N Curves

8.4 Cumulative Fatigue Damage Ratio

9. CONCLUDING SUMMARY

10. REFERENCES