Abstract
For the structural design of welded girders with numerical approach, residual stresses and initial deformations or geometric imperfections need to be considered. Nowadays, with the development of computer technology and finite element theory, the numerical welding simulation approaches have improved significantly. However, the three dimensional welding simulation requires a huge amount of computing resources, which limits its wide application. This paper presents a simplified numerical approach based on a modified, so-called local-global model approach. This approach was developed and calibrated with experimental investigation by means of the single- and double-sided welded girders. By comparing the results of numerical calculations and experimental results, it shows that the simplified welding simulation cannot only calculate the residual stress of welded girders with single- and double-sided welds relatively accurately, but also obtain acceptable results of the deformations caused by the welding process. Besides, the calculated residual stress distribution can be automatically inputted into the numerical model for the subsequently further buckling analysis of the welded girders. The calculation results show that the buckling load obtained by numerical approach are in good agreement with the experimental results and the both welded girders have a relatively smaller different of bending capacity, despite clearly different residual stress distributions is exist.
Published Version
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