Article describes modeling processes influencing the lines in rods load truss of the bridge crane in Mathcad system: for the rods of the top belt of a truss; for the rods of the bottom belt of a truss; for diagonal and vertical rods of a truss at various section of the load truss; algorithm and a program complex for automation of modeling and graphical representation influence lines and maximum their values. The proposed modeling procedures of the influence lines in any section of a load truss make it possible to reduce time and cost for these calculations’ performance at least in ten times and to carry out the research on load truss parameters, rods parameters and materials change effectively.
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