LIAO Ping,ZHANG Xiucheng,ZHU Haifeng,et al.Parameter Sensitivity Study on Stress Intensity Factors of Cruciform Weld Details in Steel Bridges[J].Journal of Disaster Prevention and Mitigation Engineering,2020,40(06):929-935.
LIAO Ping,ZHANG Xiucheng,ZHU Haifeng,et al.Parameter Sensitivity Study on Stress Intensity Factors of Cruciform Weld Details in Steel Bridges[J].Journal of Disaster Prevention and Mitigation Engineering,2020,40(06):929-935. DOI: 10.13409/j.cnki.jdpme.2020.06.011.
Parameter Sensitivity Study on Stress Intensity Factors of Cruciform Weld Details in Steel Bridges
The fracture parameters of the welded details are directly related to the fatigue crack propagation and fatigue performance. In order to investigate the influence of geometric parameters and crack parameters on the stress intensity factor, the cruciform weld detail was selected as the research object. A three-dimensional fracture mechanical model with a semi-elliptical crack was established by using ANSYS software. The stress intensity factor of each joint on the front edge of the crack was analyzed based on the displacement method. The influence of geometric parameters (including weld size, plate thickness, butt weld parameters) and crack parameters (including crack size and crack shape ratio) on the stress intensity factors was discussed, and the crack shape correction coefficient function was fitted. The results show that the stress intensity factor decreases with the increase of the butt weld reinforcement and web thickness, but has little relationship with the weld size, flange plate thickness and butt weld width. The stress intensity factor increases firstly and then decreases with the increase of the crack shape ratio, but rises with the increase of the crack length. The crack shape ratio and crack length have the greatest influence on the stress intensity factor, and the influence amplitude is as high as 18.0%.
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Related Author
DING Xuanming
LI Yifu
FANG Huaqiang
WANG Hong
XIN Yiwen
周云涛
Related Institution
College of Civil Engineering,Chongqing University
Key Laboratory of New Technology for Construction of Cities in Mountain Area,Chongqing University