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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

40卷

期数:

2023年05期

页码:

119-128

栏目:

建筑结构

出版日期:

2023-09-15

文章信息/Info

Title:

Fatigue assessment of rectangular hollow section K-joints due to degree of bending

文章编号:

1673-2049(2023)05-0119-10

作者:

赵 瑞¹,刘永健^2,3,姜 磊^2,3,傅一晟²,赵亚东²,赵鑫东²

(1. 同济大学 桥梁工程系,上海 200092; 2. 长安大学 公路学院,陕西 西安 710064; 3. 长安大学 公路大型结构安全教育部工程研究中心,陕西 西安 710064)

Author(s):

ZHAO Rui¹, LIU Yongjian^2,3, JIANG Lei^2,3, FU Yisheng², ZHAO Yadong², ZHAO Xindong²

(1. Department of Bridge Engineering, Tongji University, Shanghai 200092, China; 2. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 3. Research Center of Highway Large Structure Engineering on Safety of Ministry of Education, Chang'an University, Xi'an 710064, Shaanxi, China)

关键词:

疲劳评估;  矩形空管K型节点;  弯曲应力占比;  断裂力学法

Keywords:

fatigue assessment;  rectangular hollow section K-joint;  degree of bending;  fracture mechanics method

分类号:

U441.4

DOI:

10.19815/j.jace.2022.01040

文献标志码:

A

摘要:

为提高S-N曲线法与断裂力学法等疲劳评估方法的准确性,探讨了矩形钢管K型节点在支管拉压平衡荷载作用下的弯曲应力占比计算方法。首先建立了矩形钢管K型节点有限元模型并结合试验进行了验证,然后通过大量的参数分析得出了节点几何参数对弯曲应力占比的影响,最后通过多元非线性回归分析推导出弯曲应力占比的计算公式及考虑工程实际应用偏安全的修正公式,给出了基于断裂力学法的矩形钢管K型节点断裂评估算例。结果表明:建立的模型与试验值相比,弯曲应力占比平均值为1.051,均方差为0.167,两者最大差值仅为7.5%,说明建立的有限元模型可靠; 提出的弯曲应力占比计算公式与有限元计算结果相比,其均值为1.073,均方差为0.055,变异系数为0.051,相对差值在10%之内,验证了拟合公式的可靠性; 考虑实际工程偏安全应用,在99.73%的保证率下提出乘以0.93倍的安全系数对弯曲应力占比计算公式进行修正; 当热点应力相近,弯曲应力占比降低39.3%时,疲劳寿命会降低10%,膜应力变大时会导致其裂纹尖端具有更大的应力强度因子而加快了裂纹扩展的速率。

Abstract:

In order to improve the accuracy of fatigue assessment methods such as S-N curve method and fracture mechanics method, the calculation method of degree of bending(DoB)of rectangular hollow section(RHS)K-joints under tension-compression balanced axial force was discussed. Firstly, the finite element model of RHS K-joints was established and verified by experiments. Then, the influence of joint geometric parameters on the DoB was obtained through a large number of parameter analysis. Finally, the calculation formula of the DoB and the correction formula considering the partial safety of engineering by multivariate nonlinear regression analysis. An example of fracture evaluation of RHS K-joints based on fracture mechanics method was given. The results show that compared with the experimental values, the average bending stress ratio of the established model is 1.051, the mean square error is 0.167, and the maximum difference between the two is only 7.5%, indicating that the established finite element model is reliable. Compared with the finite element calculation results, the mean value of the proposed DoB calculation formula is 1.073, the mean square error is 0.055, the coefficient of variation is 0.051, and the relative difference is within 10%, which verifies the reliability of the fitting formula. Considering the partial safety application of practical engineering, the formula for calculating the DoB is modified by multiplying the safety factor by 0.93 times under the guarantee rate of 99.73%. When the hot spot stress is similar, DoB is reduced by 39.3%, and the fatigue life will be reduced by 10%. When the membrane stress becomes larger, and the crack tip will have a larger stress intensity factor and accelerate the crack propagation rate.

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备注/Memo

备注/Memo:

收稿日期:2022-01-10
基金项目:国家自然科学基金项目(52008026); 长安大学研究生科研创新实践项目(300103714019)
作者简介:赵 瑞(1997-),女,工学博士研究生,E-mail:2310571@tongji.edu.cn。
通信作者:刘永健(1966-),男,工学博士,教授,博士生导师,E-mail:liuyongjian@chd.edu.cn。

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更新日期/Last Update: 2023-09-01