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- 저자 : Weitong Yi (검색결과 2 건)
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Weitong Yi,Lingxiao Zuo,Tianxi Chen,Mei Wang,Hailin Sun,Lei Zhu,Xi Chen 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.6
A new elliptical one-sided bolt was applied for connection of the steel square tubular column and the I-shaped beam joint. This new bolt is simple in structure and easy to install. Besides, as the bolt head and bolt hole are both elliptical, the new one is quite diff erent from the traditional circular bolts lacking bending performance studies of the joint. Therefore, experiments and fi nite element analysis on ultimate bearing capacity of the joint were conducted, monotonic static loading of six joint specimens were tested, and the moment-rotation curves were obtained in this study. The eff ects of various factors such as axial load ratio and bolt size on bearing capacity were analyzed. Finite element simulation was carried out, and it fi tted tests well. Both tests and simulation showed that failure mode of joints is fi rstly yielding at the endplate. The larger the bolt size, the better the joint ultimate bearing capacity can be enhanced. The M16 group indicated a pattern that the larger axial load on column, the less of ultimate bearing capacity of the joint. However, the M20 group comes to a diff erent pattern which contradicts the assumption, thus further studies are needed in this regard.
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A Novel Structural Optimization Method and a Case Study Based on a CHS X-Joint
Xingqi Liu,Weitong Yi,Hailin Sun,Lei Zhu,Xi Chen 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.4
In this paper, a new structural optimization method, “percentage structure optimization”, is presented. This method is obtained by using fi nite element method (FEM) to reduce a specifi c proportion of the stress ineffi cient element reduction, which is called the "structural optimization percentage index". In addition, an evaluation index of the optimized structure, “economic benefi t index”, is introduced. Compared with the existing structural optimization methods, the optimization process is smoother and the results are more controllable. Moreover, the method of evaluating the optimization results through the “economic benefi t index” pays more attention to the economic benefi ts of the project, and can achieve the balance between the minimization of material and the detention of bearing capacity to maximize the economic benefi ts. On the basis of the existing experiment, using ANSYS 17.0 software, two Circular Hollow Sections (CHS) X-joints are optimized by "structural optimization percentage index" of 5, 10 and 15%, and "economic benefi t index" is adopted as the judgment condition of the optimization results. The results show that the method can not only guarantee the bearing capacity, but also save materials as much as possible, and verify the reliability of the new structural optimization method.
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