|Table of Contents|

Fatigue performance analysis of tensile flange welds in beam-column joints of three-dimensional garages(PDF)

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

Issue:
2025年04期
Page:
83-91
Research Field:
建筑结构
Publishing date:

Info

Title:
Fatigue performance analysis of tensile flange welds in beam-column joints of three-dimensional garages
Author(s):
PAN Kang;  HE Yongjun
(College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China)
Keywords:
three-dimensional garage;  high-cycle fatigue;  dload subroutine;  vehicle movement load;  weld form;  carriage form;  equivalent structural stress method
PACS:
TU248.3
DOI:
10.19815/j.jace.2024.01024
Abstract:
To study the high-cycle fatigue issues arising from the frequent movement and access of vehicles in service for the new steel structure three-dimensional garage, the overall steel frame beam unit model and the beam-column node solid unit model were established successively. The dload subroutine was used to simulate the uniform motion of vehicles along the guide beam. The equivalent structural stress method was employed to analyze the fatigue characteristics of local welds. The effects of weld form, root gap and bevel angle on the structural fatigue life were investigated. The fatigue damage and service life of double-carriage and triple-carriage form three-dimensional garages were calculated. The results show that the fatigue control position of the steel structure three-dimensional garage is the beam-column node near the rear wheel on the bottom layer, where tensile flange butt welds are located. The intersection area of the beam flange weld and the weld hole belongs to a highly stress-concentrated area. The stress distribution is more uniform and the fatigue performance is better for the double-slanting groove full penetration weld connection compared to the single-slanting groove full penetration weld structure. The fatigue life of the weld decreases with the increase of the root gap and bevel angle, and the root gap has the dominant influence. The load conditions of the triple-carriage form of three-dimensional garage are more complex, and special attention needs to be paid to its fatigue performance during engineering construction. The equivalent structural stress method evaluates fatigue using only one main fatigue strength-fatigue life curve, which is insensitive to the grid and is suitable for fatigue life assessment of large and important structures.

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4 结 语
(1)车辆的搬运存取过程可用dload子程序模拟,钢结构立体车库的疲劳控制部位在底层靠近后轮梁柱节点A1的受拉翼缘对接焊缝处。
(2)梁柱节点的梁翼缘焊缝与焊缝孔相交区域属于应力高度集中区,疲劳寿命远低于焊缝两端; 相较于单面焊,采用双面焊连接形式的结构应力更为均匀,疲劳性能更好; 受拉翼缘局部焊缝的疲劳寿命随着焊缝根部间隙和坡口角度的增大而减小,且根部间隙的影响占主导因素。
(3)三车位车厢相较于双车位车厢形式的立体车库荷载工况更为复杂,疲劳性能更差; 等效结构应力法考虑了荷载模式、应力集中与构件厚度的综合效应,适用于大型重要结构的疲劳寿命评估。

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LIU Xiyue, WANG Yuanqing, SHI Yongjiu, et al. Experimental study on low-cycle fatigue fracture behavior of high strength steel beam-to-column connection[J]. Journal of Building Structures, 2018, 39(2): 28-36.
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HE Yongjun, ZHOU Xuhong, TANG Jiayun. Research on diaphragm arrangement of quadrangular tube-type steel frame tridimensional parking structure[J]. Journal of Architecture and Civil Engineering, 2014, 31(3): 25-31.
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Last Update: 2025-07-10