{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T04:35:20Z","timestamp":1777437320376,"version":"3.51.4"},"reference-count":74,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2024,8,22]],"date-time":"2024-08-22T00:00:00Z","timestamp":1724284800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001871","name":"Portuguese Foundation for Science and Technology (Funda\u00e7\u00e3o para a Ci\u00eancia e Tecnologia-FCT)","doi-asserted-by":"publisher","award":["2023.01289.BD"],"award-info":[{"award-number":["2023.01289.BD"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JMSE"],"abstract":"<jats:p>With growing concerns about the danger of global climate change and worldwide demand for energy, the interest in the investigation and construction of renewable energy technologies has increased. Fixed platforms are a type of support structure for wind turbines composed of different types of tubular joints. These structures are under different kinds of cyclic loadings in ocean environmental conditions, which must be designed and reinforced against fatigue. In the present paper, the relationships between the parameters in DKT-joints reinforced with FRP under axial loads are investigated using several models, under 16 axial loading cases, with different nondimensional parameters and different FRP materials, and orientations were generated in ANSYS (total 5184) and analyzed. The four loading conditions that cause the maximum stress concentration factors were selected. After analyzing the 1296 reinforced models, relevant data were extracted, and possible samples were created. The extracted data were used in a multivariate data analysis of maximum stress concentration factors. The Pearson correlation coefficient is utilized to study the relationship between parameters and subsequently to make predictions. To reduce the number of variables and to group the data points into clusters based on certain similarities, hierarchical and non-hierarchical classifications are used, respectively.<\/jats:p>","DOI":"10.3390\/jmse12081451","type":"journal-article","created":{"date-parts":[[2024,8,22]],"date-time":"2024-08-22T03:07:38Z","timestamp":1724296058000},"page":"1451","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Multivariate Data Analysis of Maximum Stress Concentration Factors in FRP-Retrofitted Two-Planar KT-Joints under Axial Loads for Offshore Renewables"],"prefix":"10.3390","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6867-5993","authenticated-orcid":false,"given":"Esmaeil","family":"Zavvar","sequence":"first","affiliation":[{"name":"Department of Civil Engineering, Faculty of Engineering of the University of Porto (FEUP), 4200-465 Porto, Portugal"},{"name":"Interdisciplinary Centre of Marine and Environmental Research of the University of Porto (CIIMAR), 4450-208 Matosinhos, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5638-331X","authenticated-orcid":false,"given":"Fernanda","family":"Sousa","sequence":"additional","affiliation":[{"name":"Department of Civil Engineering, Faculty of Engineering of the University of Porto (FEUP), 4200-465 Porto, Portugal"},{"name":"Research Centre for Territory, Transports and Environment (CITTA), 4200-465 Porto, Portugal"}]},{"given":"Francisco","family":"Taveira-Pinto","sequence":"additional","affiliation":[{"name":"Department of Civil Engineering, Faculty of Engineering of the University of Porto (FEUP), 4200-465 Porto, Portugal"},{"name":"Interdisciplinary Centre of Marine and Environmental Research of the University of Porto (CIIMAR), 4450-208 Matosinhos, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3768-3314","authenticated-orcid":false,"given":"Paulo","family":"Rosa Santos","sequence":"additional","affiliation":[{"name":"Department of Civil Engineering, Faculty of Engineering of the University of Porto (FEUP), 4200-465 Porto, Portugal"},{"name":"Interdisciplinary Centre of Marine and Environmental Research of the University of Porto (CIIMAR), 4450-208 Matosinhos, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2024,8,22]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"108734","DOI":"10.1016\/j.jcsr.2024.108734","article-title":"SCFs for CHS-to-CHS T- and X-type moment-loaded end connections: Proposal for formulae","volume":"218","author":"Ziaeinejad","year":"2024","journal-title":"J. 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