Sensitivity analysis of simple methods in determination of offshore jacket structures levels stiffness

Tabeshpour, Mohammad Reza; Ahmadi, Ali

doi:10.1007/s00773-021-00856-4

Cited by 1 publication

(3 citation statements)

References 27 publications

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“…Therefore, the elements of the three-diagonal stiffness matrix of the reduced model were calculated based on the method suggested in Tabeshpour and Noorifard 52 and Tabeshpour and Ahmadi. 53 This method is briefly introduced below. More details can be found in the referred references.…”

Section: Reduced Model Stiffness Matrix Calculation Methodsmentioning

confidence: 99%

“…So, one must select a proper method to calculate stiffness matrix elements well. Such an effort was carried out by Tabeshpour and Noorifard 52 in the case of civil structures and Tabeshpour and Ahmadi 53 in the case of OJP structures. In both researches, they examine several methods to calculate the lateral stiffness of each level for multi-story flexural and shear buildings.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, the reduced and accurate stiffness matrix was calculated according to the investigations and engineering judges took in the last researches. 52,53 It is to reach a reduced and accurate model of OJP to use that as a base model for healthy structure and make a reference to accomplish comparison between damaged and healthy structure and detection of position and severity of the damage.…”

Section: Introductionmentioning

confidence: 99%

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A stiffness-based method for damage detection in 3-D offshore jacket platforms using inverse vibration problem (IVP) technique

Tabeshpour

Abbaspour

Ahmadi

2022

Proceedings of the Institution of Mechanical Engineers, Part M:

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More attention has been paid to Damage detection in offshore jacket platforms (OJP) because of repair and maintenance issues. Damage detection using modal data from a few sensors is one of the main important subjects that researchers have paid attention to it. The inverse Vibration Problem (IVP) technique does not need modal data in all nodes of OJP but first modal data in different levels of platform and principal degrees of freedom could be sufficient. Since the complex structural model becomes a reduced shear building by implementing this technique, there must be a reduced equivalent stiffness matrix for the healthy structure to make the comparison for damage detection. This paper deals with the formulation and implementation of IVP technique in corporation of the proper method for calculation of equivalent level stiffness. The proper method was selected based on a comparison of modal data obtained from full and reduced models using comparison tools like the MAC coefficient. Also, damage detection in a typical OJP model under a specific damage scenario was investigated numerically and experimentally and the results show the reliable performance of the methodology. A damage detection flowchart is suggested to detect damage location properly. It is developed mainly based on geometrical couplings in OJP structure in damaged conditions and the method leads to damage location exactly and maximum error in damage prediction is obtained at about 12%.

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Section: Reduced Model Stiffness Matrix Calculation Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%