Stress concentration factor calculating method based on circular hollow section K-joint stiffness

被引：0
|
作者：
Chen K. [1 ]
Huang H. [1 ]
Wu Q. [1 ,2 ]
Chen B. [1 ]
机构：
[1] School of Civil Engineering, Fuzhou University, Fuzhou
[2] Fujian Provincial Key Laboratory on Multi-Disasters Prevention and Mitigation in Civil Engineering, Fuzhou University, Fuzhou
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2020年 / 41卷 / 04期
关键词：
Circular hollow section (CHS) K-joint; Coupling effect; Finite element analysis (FEA); Geometric parameter; Joint stiffness; Stress concentration factor;
D O I：
10.14006/j.jzjgxb.2018.0192
中图分类号：
学科分类号：
摘要：
A three-dimensional solid finite element model was established to carry out parametric analysis on the stress concentration factor of circular hollow section (CHS) K-joints by the general software of MSC.MARC. Based on the existing results of tests and finite element analysis of CHS K-joints, deficiency of the formula adopted by the current codes to calculate the stress concentration factor of CHS K-joints was revealed. A method for calculating the stress concentration factor based on CHS K-joint stiffness was proposed by combining the theoretical derivation and regression analysis, and the accuracy and feasibility of the calculating method was validated. It is found that the differences between the test results and the finite element analysis results in terms of the maximum displacement and maximum hot spot stress of CHS K-joints are less than 5.11% and 6.83%, respectively, demonstrating that the finite element model has high accuracy. By comparing with the results of finite element analysis, it is found that there is a coupling effect among the geometric parameters of CHS K-joins in its stress concentration factor, as the variation of one parameter generally leads to the variation of other parameters. Because the current stress concentration factor calculating method of CHS K-joints is based on regression analysis according to single geometric parameter, it ignores the coupling effect caused by geometric parameters of the joints. Therefore, it has a small safety margin and is not suitable to calculate the stress concentration factor of CHS K-joints used in bridge structures. The proposed stress concentration factor calculating method based on CHS K-joint stiffness can not only consider the coupling effect caused by the geometric parameters of the joints, but also improve the safety margin and accuracy of evaluating and calculating the stress concentration factor of CHS K-joints used in bridge structures. © 2020, Editorial Office of Journal of Building Structures. All right reserved.
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页码：42 / 50and118
相关论文
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