The fatigue assessments for boom girders of a concrete pump truck, which is typically a welded box girder structure, were investigated in this study. Finite element analysis were conducted using shell and beam elements to obtain the stress histories of the boom girders. Field tests were performed to verify the finite element model. Then, the loading spectrum was developed using the rain-flow counting method. The fatigue assessments for the boom girders were evaluated using the nominal stress method and Miners cumulative damage rule based on the International Institute of Welding recommendation. It is found that some critical locations of the boom girder were at risk for fatigue failure. To overcome this problem, it is suggested to add diaphragms to boom girders.
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