Code of practice for fatigue design and assessment of steel structures

1993 ◽  
Keyword(s):  
Steel Structures ◽  
Code Of Practice ◽  
Fatigue Design

Background for New Revision of DNV-RP-C203 Fatigue Design of Offshore Steel Structures

2010 ◽  
Author(s):  
Inge Lotsberg
Keyword(s):  
Steel Structures ◽  
Electronic Version ◽  
Fatigue Assessment ◽  
Fatigue Design ◽  
Different Types ◽  
Background Material ◽  
Made In

The DNV-RP-C203 Fatigue Design of Offshore Steel Structures is being used by a number of different companies for fatigue assessment of different types of structures. This has resulted in questions to DNV about background for the different sections in the document. It is therefore important that the basis for this document is open to the industry. Quite a lot of the background material has also been published earlier at conferences and in journals. In some situations it has been found that the content can be improved to better suite the industry. The document is presented in an electronic version making revisions easy. Therefore it has been revised several times since the last official presentation of a revision in 2005. The present paper gives an overview of the most significant changes made in the document since the 2005 revision. Some of these changes are already included in the present version of DNV-RP-C203. The remaining changes will be included in a revision dated 2010.

Uncertainties in the fatigue design of offshore steel structures

1991 ◽  
Vol 4 (4) ◽  
pp. 317-332 ◽  
Author(s):  
A. Pittaluga ◽  
R. Cazzulo ◽  
P. Romeo
Keyword(s):  
Steel Structures ◽  
Fatigue Design

Background for Revision of DNV-RP-C203 Fatigue Analysis of Offshore Steel Structure

2005 ◽  
Author(s):  
Inge Lotsberg
Keyword(s):  
Steel Structure ◽  
Steel Structures ◽  
Offshore Structures ◽  
Fatigue Analysis ◽  
Time Interval ◽  
Fatigue Design ◽  
The World ◽  
New Research ◽  
Made In

The last revision of the DNV recommended practice “Fatigue Analysis of Offshore Steel Structures” is from October 2001. During use of this standard some feed back from designers around the world have been received. Also some new research in the area has been performed in the time interval from it was first developed. It is also realised that the document is being used for fatigue design of some other types of details and structures than was thought of when the document was originally developed. Therefore it was now found convenient to revise the document to incorporate the experience gained and new research and developments made in the area of fatigue of offshore structures the last 7 years since the main content for this recommended practice was developed.

System Effects in Fatigue Design of Long Pipes and Pipelines

2010 ◽  
Author(s):  
Inge Lotsberg ◽  
Kim Mo̸rk ◽  
Sverre Valsga˚rd ◽  
Gudfinnur Sigurdsson
Keyword(s):  
Internal Pressure ◽  
Hot Spot ◽  
Large Diameter ◽  
Steel Structures ◽  
Physical Models ◽  
Stress Range ◽  
Safety Level ◽  
Seam Weld ◽  
Spot Area ◽  
Fatigue Design

In fatigue design of steel structures the hot spot area is normally limited in size. In pipelines and cylinders used for transportation and storage of compressed natural gas the hot spot area can extend to several kilometers along a seam weld subjected much to the same stress range. The fatigue capacity for large diameter pipes is reduced as the weld length is increased. The seam weld in pipes is subjected to a significant stress range normal to its weld toes when it is subjected to varying internal pressure from start and stop of gas transportation through pipelines and from filling and emptying of cylinders. A reliable methodology is required for fatigue design of long pipes in order to meet target safety level at an acceptable cost. This includes description of physical models that represents actual long term fatigue capacity of the pipes subjected to varying internal pressure. The design methodology includes length of welds, fabrication tolerances, fabrication methodology and non destructive testing. It also involves definition of characteristic values for loading and capacity in addition to a recommended Design Fatigue Factor to be used in fatigue design. Alternative fatigue design procedures require different Design Fatigue Factors to achieve a required target safety level for pipelines and cylinders used for transportation of gas. These issues are further considered in this paper.

scholarly journals Experimental Data Assessment and Fatigue Design Recommendation for Stainless-Steel Welded Joints

Metals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 723 ◽  
Author(s):  
Peng ◽  
Chen ◽  
Dong
Keyword(s):  
Stainless Steel ◽  
Fatigue Strength ◽  
Structural Steel ◽  
Fatigue Test ◽  
Test Data ◽  
Welded Joints ◽  
Steel Structures ◽  
Design Codes ◽  
Inverse Slope ◽  
Fatigue Design

Stainless steel possesses outstanding advantages such as good corrosion resistance and long service life. Stainless steel is one of the primary materials used for sustainable structures, and welding is one of the main connection modes of stainless-steel bridges and other structures. Therefore, fatigue damage at welded joints deserves attention. The existing fatigue design codes of stainless-steel structures mainly adopt the design philosophy of structural steel. In order to comprehensively review the published fatigue test data of welded joints in stainless steel, in this paper, the fatigue test data of representative welded joints of stainless steel were summarized comprehensively and the S–N curves of six representative stainless-steel welded joints were obtained by statistical evaluation. The comparison of the fatigue strength from existing design codes and fatigue test data was performed, and the results showed that the fatigue strength of welded joints of stainless steel was higher than that of structural-steel welded joints. The flexibility of regression analysis with and without a fixed negative inverse slope was discussed based on the scatter index. It was found that the fatigue test data of stainless-steel welded joints are more consistent with the S–N curve regressed by a free negative inverse slope. In this paper, a design proposal for the fatigue strength of representative welded joints of stainless steel is presented based on the S–N curve regressed by the free negative inverse slope.

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