Development of validated finite element model for reinforced thin-walled I-beam using steel patch method

• 第一著者: Rokhim, Mochamad Iqbal
• フォーマット: 学位論文
• 言語: 英語; 英語
• 出版事項: 2021
• 主題: T Technology (General); TA Engineering (General). Civil engineering (General)
• オンライン･アクセス: http://eprints.utem.edu.my/id/eprint/26080/; https://plh.utem.edu.my/cgi-bin/koha/opac-detail.pl?biblionumber=121293

Thin-walled structure I-beam is widely used in automotive, oil and gas and construction engineering due to their superior strength-to-weight ratio. For these industries, the application of a thin-walled I-beam can reduce the manufacturing and shipping costs. However, there are some problems when using a steel beam in an open area for a long time. The defect such as crack and corrosion may occur to the thin-walled I-beam steel structures. These weaknesses can cause the structure to fail at a lower than designed load. These problems could be solved by either replacing, reshaping or reinforcing the thin-walled I- beam structure. In engineering fields, patch reinforcement is used in 60% of the whole structure reinforcement cases. Thus, this study was to validate a model of steel patched reinforced thin-walled I-beam. Patching the defected thin-walled I-beam using the steel plate is a common occurrence in engineering. Steel plates are relatively cheaper than composites and easy to be prepared. It can also be attached to the structure using a welding method popular in practical engineering fields. The patch reinforcement application will be tested with extensive study to evaluate its capability. Therefore, the FEA on reinforced thin-walled I-beam needs to be employed. In FEA, a model that can represent the actual experimental conditions need to be validated. In this study, the reinforced thin-walled I-beam model validated through three-step validations. Each step is validating the necessary part of the reinforced thin-walled I-beam. First, modelling a simple thin-walled I-beam to investigate the boundary condition for thin-walled I-beam until getting 96% accuracy stress analysis compared to the analytical calculation. Second, modelling the welded joints with a triangle geometry to model the joint behavior until getting 95% accuracy compared to the four-point bending test result. Lastly, modelling the patch area with various bonded contact coverage to complete the reinforced thin-walled I-beam model until stress analysis results in 85% accuracy compared to the four-point bending test result. This model can predict the optimum size of the patch. The optimum patch can develop a relationship between the steel patch and the defected area. The validated model generates the patch-to-defect ratio for the 20 mm defect lengths was 5.51, for 30 mm defect was 4.28, for 40 mm defect was 3.71, and for 50 mm defect was 3.22. The ratio will decrease when the defected area length extended.