Abstract
The paper presents the results of experimental studies of the durability of a rectangular welded truss. The truss is made of profile pipes with butt joint nodes. A concentrated cyclic load is adopted for the construction, which corresponds to the operating mode of the roof truss with the ways for the bridge crane. The study was performed using the method of semi-natural and computer simulation experiment in ANSYS Workbench 17 environment. It was found that the loss of bearing capacity by the truss during operation occurs due to the fatigue crack initiation in the K-shaped node on the upper chord of the truss. The durability of the truss is determined by the ratio of the parameters of force and time of operation of the truss. The results of the semi-natural and computer simulation experiment were verified and the fatigue damage indicators coincided at the level of 5.7%.Keywords: welded truss, fatigue damage, truss nodes, durability of the truss.
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