• 船舶海洋与建筑工程 •

### 平面单元和壳单元在复合有限条法中模拟加劲肋的应用

1. 1.上海交通大学 船舶海洋与建筑工程学院, 上海 200240
2.纽约州立大学理工学院 工程学院, 美国 纽约 13502
• 收稿日期:2021-05-06 出版日期:2022-06-28 发布日期:2022-07-04
• 通讯作者: 龚景海 E-mail:gongjh@sjtu.edu.cn
• 作者简介:侯彦果 (1992-),男,湖南省长沙市人,博士生,主要从事薄壁钢结构力学性能研究.

### Application of Plane Elements and Shell Elements in Imitating Ribs of Members in Compound Strip Method

HOU Yanguo1, LI Zhanjie2, GONG Jinghai1()

1. 1. School of Naval Architecture Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2. Department of Engineering, SUNY Polytechnic Institute, New York 13502, USA
• Received:2021-05-06 Online:2022-06-28 Published:2022-07-04
• Contact: GONG Jinghai E-mail:gongjh@sjtu.edu.cn

Abstract:

Finite strip method (FSM) is a classical method to analyze the buckling of thin-walled members. The traditional FSM adopting trigonometric functions longitudinally can hardly analyze the members with spaced ribs along the longitudinal direction, while the compound strip method (CSM) can compensate for this shortcoming. Based on the CSM, the influence of utilizing plane elements and shell elements to respectively imitate stiffeners on buckling is investigated. Compared with the shell-element ribs, the plane-element ribs are prone to assembling the stiffener matrices with fewer degrees of freedom. But the shell-element ribs are more comprehensive as the out-plane displacement of ribs are taken into consideration. It is found that plane element ribs and shell element ribs have little difference on the buckling capacity of members. The buckling capacity has a small difference of mean absolute error (MAE) underneath 0.75% between the two types of CSMs, and the buckling capacity and modes are in good agreement with the finite element results. The buckling loads of the two types of CSMs are close to the FEM with a MEA less than 5%. The accuracy of the plane elements satisfies the predicted requirements, which helps to reduce the program computation and simplify the analysis complexity. The efficiency of analysis can be dramatically improved for fine meshing elements.