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 Ahmed Hammad,Yehia Abdel-Nasser,Mohamed Shama.Rational Design of T-Girders via Finite Element Method[J].Journal of Marine Science and Application,2021,(2):302-316.[doi:10.1007/s11804-021-00206-1]
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Rational Design of T-Girders via Finite Element Method


Rational Design of T-Girders via Finite Element Method
Ahmed Hammad Yehia Abdel-Nasser Mohamed Shama
Ahmed Hammad Yehia Abdel-Nasser Mohamed Shama
Department of Naval Architecture and Marine Engineering, Faculty of Engineering, Alexandria University, Alexandria 21544, Egypt
Out-of-plane distortionFinite element modelingWelding residual stressesFabricated T-girderSection modulus
The main configuration of ship construction consists of standard and fabricated stiffening members, such as T-sections, which are commonly used in shipbuilding. During the welding process, the nonuniform heating and rapid cooling lead to welding imperfections such as out-of-plane distortion and residual stresses. Owing to these imperfections, the fabricated structural members may not attain their design load, and removing these imperfections will require extra man-hours. The present work investigated controlling these imperfections at both the design and fabrication stages. A typical fabricated T-girder was selected to investigate the problem of these imperfections using double-sided welding. A numerical simulation based on finite element modeling (FEM) was used to investigate the effects of geometrical properties and welding sequence on the magnitude of the welding imperfections of the T-girder. The FEM results were validated with the experimental measurements of a double-sided fillet weld. Regarding the design stage, the optimum geometry of the fabricated T-girder was determined based on the minimum steel weight and out-of-plane distortion. Furthermore, regarding the fabrication stage, a parametric study with two variables (geometrical properties and welding sequence) was conducted to determine the optimum geometry and welding sequence based on the minimum welding out-of-plane distortion. Increasing the flange thickness and reducing the breadth while keeping the T-girder section modulus constant reduced the T-girder weight and out-of-plane distortion. Noncontinuous welding produced a significant reduction in the out-of-plane distortion, while an insignificant increase in the compressive residual stress occurred.


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Received date:2019-10-12;Accepted date:2021-01-26。
Corresponding author:Ahmed Hammad, ahmed.hammad@alexu.edu.eg
Last Update: 2021-09-06