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In order to analyze the dynamic characteristic of a co-use of weld and bolts joint structure, this paper, based on the virtual gradient material model and two welded joint interface modeling methods, proposed a modeling method of the L type co-use of weld and bolts joint interface. The natural frequency and vibration mode of the co-use of weld and bolts joint structure were studied according to simulation and experimental researches. The natural frequency of two kinds of joint surface modeling methods are respectively obtained. Modal test analysis was then carried out to verify what kind of modeling method is more effective and feasible. The results shows that the 45°weld rigid connection model is consistent with the first six-order vibration mode shapes of the experimental mode. The relative errors of corresponding natural frequencies between the model and the experiment are less than 5%, which have higher modeling accuracy.

Modeling Method of the L-Type Co-Use of Weld and Bolts Joint Interface