Journal
INTERNATIONAL JOURNAL OF STEEL STRUCTURES
Volume 18, Issue 5, Pages 1589-1597Publisher
KOREAN SOC STEEL CONSTRUCTION-KSSC
DOI: 10.1007/s13296-018-0056-4
Keywords
Fatigue test; Weld root crack; Hot spot stress; Fatigue strength; 1-mm stress
Funding
- National Natural Science Foundation of China [51478163, 51678216]
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Fatigue tests and numerical analysis were carried out to evaluate the fatigue performance at the U-rib to deck welded joint in steel box girder. Twenty specimens were tested corresponding to different penetration rates (80 and 100%) under fatigue bending load, and the fatigue strength was investigated based on hot spot stress (HSS) method. The detailed stress distribution at U-rib to deck welded joint was analyzed by the finite element method, as well as the stress intensity factor of weld root. The test results show that the specimens with fully penetration rate have longer crack propagation life due to the welding geometry, resulting in higher fatigue failure strength. The classification of FAT-90 is reasonable for evaluating fatigue strength by HSS method. The penetration rate has effect on crack propagation angle near the surface, and the 1-mm stress below weld toe and root approves to be more suitable for fatigue stress assessment, because of its high sensitivity to weld geometry than HSS.
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