Axial compression tests of grouted connections in jacket and monopile offshore wind turbine structures

Chen, Tao; Wang, Xian; Gu, Xianglin; Zhao, Qi; Yuan, Guokai; Liu, Jinchao

doi:10.1016/j.engstruct.2019.109330

Cited by 22 publications

(3 citation statements)

References 22 publications

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“…Chen et al carried out a fatigue bending test and axial compression test on the specimen. Given all this work, it is clear that many different studies are currently in progress [22,23].…”

Section: Introductionmentioning

confidence: 99%

Fatigue Life and Crack Initiation in Monopile Foundation by Fatigue FE Analysis

et al. 2023

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The construction of new renewable energy infrastructures and the development of new ocean resources continues to proceed apace. In this regard, the increasing size and capacity of offshore wind turbines demands that the size of their accompanying supporting marine structures likewise increase. The types of marine structures utilized for these offshore applications include gravity base, monopile, jacket, and tripod structures. Of these four types, monopile structures are widely used, given that they are comparatively easy to construct and more economical than other structures. However, constant exposure to harsh cyclic environmental loads can cause material deterioration or the initiation of fatigue cracks, which can then lead to catastrophic failures. In this paper, a 3D fatigue finite element analysis was performed to predict both the fatigue life and the crack initiation of a welded monopile substructure. The whole analysis was undertaken in three steps. First, a 3D non-steady heat conduction analysis was used to calculate the thermal history. Second, a thermal load was induced, as an input in 3D elastoplastic analysis, in order to determine welding residual stresses and welding deformation. Finally, the plastic strain and residual stress were used as inputs in a 3D fatigue FE analysis in order to calculate fatigue crack initiation and fatigue life. The 3D fatigue finite element analysis was based on continuum damage mechanics (CDM) and elastoplastic constitutive equations. The results obtained from the 3D fatigue finite element analysis were compared with hot spot stresses and Det Norske Veritas (DNV-GL) standards.

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“…Chen et al carried out a fatigue bending test and axial compression test on the specimen. Given all this work, it is clear that many different studies are currently in progress [22,23].…”

Section: Introductionmentioning

confidence: 99%

Fatigue Life and Crack Initiation in Monopile Foundation by Fatigue FE Analysis

et al. 2023

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“…Monitoring technologies for blade fatigue and bolt connection of onshore and offshore wind turbines have been developed [2,3]. The grouted jacket connections (GJCs) widely used to connect steel tubes of the platform and pile foundations under sea water are the critical parts of the supporting structures of offshore wind turbines.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Debonding Detection for Grouted Jacket Connection of an Off-Shore Wind Turbine Supporting Structure Specimen With PZT Patches

LIU,

XU,

ZHU

et al. 2023

Proceedings of the 14th International Workshop on Structural Health Monitoring

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Grouted jacket connections (GJCs) have been widely used to connect longitudinal components of offshore wind turbine supporting structures. Debonding defects detection in GJCs is critical for the safety and serviceability of offshore wind turbine support structures. In this paper, an interface debonding detection approach for a scaled GJC specimen using both surface stress wave and Electromechanical impedance (EMI) measurement is proposed with Piezoelectric lead zirconate titanate (PZT) patches. The scaled GJC specimen with various mimicked interface debonding detects is designed. Based on the surface stress wave measurements of PZT sensors arranged with a one pitch and multiple catch (OPMC) configuration, the regions of the mimicked defects are estimated using the intersections of the surface stress wave propagation paths with abnormal measurements. EMI measurements of PZT sensors located in the estimated debonding regions are used to accurately identify the dimension of the mimicked debonding defects using the root mean square deviation (RMSD) index of the impedance measurements of PZT sensors. The visualized debonding region is close to the actual location of the mimicked debonding defect.

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“…Application of grouting has also been made in real construction, both conventional grouting and using special methods grouting. Some research results show that grouting technology has been applied to shield tunnel construction [4][5][6], offshore wind turbine [7,8], Drainage pipe [9,10], repairs to beams, columns, plates and beamcolumn connections [11][12][13][14][15], and is used to connect connections to prestressed concrete [16,17].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Geopolymer Grout with Bagasse Ash and Resin Catalyst

Djaha¹,

Prayuda²,

Monika³

et al. 2019

Proceedings of the Proceedings of the 1st International Conference on Engineering, Science, and Commerce, ICESC 2019, 18-19 Oct

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Concrete can crack which causes a decrease of performance in the structure of the building. It requires an improvement in the damage in the concrete so that the strength returns to normal. This research was conducted to find a mixture of materials with the appropriate composition in order to restore the strength of the damaged concrete by using a new mixture modification. The material used in this study is using bagasse ash derived from sugar mill waste and chemical resin catalyst as a substitute for water and binder. The mixture was made using 5 variations in the volume ratio of catalyst resin and bagasse ash, namely 1: 0.4, 1: 0.53, 1: 0.67, 1: 0.8, and 1: 1. This research tested the mechanical properties of the specimens that have been made from the mix proportion. The result of the research that has been shown is that the addition of sugarcane ash in a mixture with resin catalyst levels continues to increase in the compressive strength. The increasing age of the concrete also increases the value of compressive strength on the specimens. The highest compressive strength is obtained by mixing material with a ratio of 1: 1, it was 96.18 MPa. The grouting material that has been made is also less effective when injected into damaged parts of the concrete because it has a thick texture which makes the material difficult to inject so that it requires greater pressure than the grout material from a mixture of cement and water

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Axial compression tests of grouted connections in jacket and monopile offshore wind turbine structures

Cited by 22 publications

References 22 publications

Fatigue Life and Crack Initiation in Monopile Foundation by Fatigue FE Analysis

Fatigue Life and Crack Initiation in Monopile Foundation by Fatigue FE Analysis

Experimental Study on Debonding Detection for Grouted Jacket Connection of an Off-Shore Wind Turbine Supporting Structure Specimen With PZT Patches

Mechanical Properties of Geopolymer Grout with Bagasse Ash and Resin Catalyst

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