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Investigation on fatigue behaviour of load-carrying fillet welded joints based on mix-mode crack propagation analysis

Zong L., Shi G., Wang Y. Q., Yan J. B., Ding Y.

Archives of Civil and Mechanical Engineering

2017

Vol. 17, no. 3

677--686

The fatigue behaviour of the load-carrying fillet welded joints was investigated by experimental and numerical approach in this paper. 26 load-carrying cruciform fillet welded joints involving 8 stress levels were tested and the S–N curves of 95% survival probability in terms of toe failure and root failure were established separately. The test results also demonstrate that the design curves of Eurocode3 are not suitable for this batch of specimens. In the following numerical simulations, three types of initial crack assumption were analysed by 3D mix-mode fatigue crack propagation analysis according to experimental observation. All the possible crack growth routes were simulated well. However, the single crack assumptions cannot form satisfactory simulations on fatigue lives with enough safety stock. Therefore, multi-crack analysis was conducted based on the combined data in terms of both toe failure and root failure. It is found that multi-crack analysis with 0.5 mm weld toe initial line crack and 0.1 mm weld root initial line crack can provide appropriate prediction. The findings can be beneficial for the fatigue assessment of load-carrying fillet welded joints fabricated by the normal welding technique in China and offer some references for the fatigue assessment of structural details with different possible failure modes.

Cyclic tests on improved beam-column connections

Shi Y. J., Chen Z. F., Wang Y. Q.

International Journal of Applied Mechanics and Engineering

2004

Vol. 9, no 1

81-89

After the Northridge earthquake in 1994, some researches in USA have identified three critical issues that significantly affect the strength and ductility of beam-column connections: (i) fracture toughness of weld metal, (ii) geometry and size of weld access hole, and (iii) control of panel zone deformation. This paper reports the experimental results from the second phase of a major research program on ductility of welded beam column connections under cyclic loadings which is supported by the Natural Science Foundation of China. The experiments focus on the geometry and size of weld access hole. Three new types of connection details are proposed and eight full size specimens are tested under cyclic loading. The ductility, the stress concentration behaviour, and the hysteretic behavior of these connections are investigated. Moreover, the influence of connection details on both the ultimate strength and the premature fracture behaviour of these connections are also analyzed, formulating advices on improvement of connection details. The experimental results provide valuable information for updating the seismic design code of high-rise steel buildings in China.