A model of statically determinate frames-truss and formulas for the calculation of its deflection under the action of various loads proposed. The model is determined by two natural parameters — the number of panels in the crossbar and the number of panels in vertical racks-trusses. A formulas dependency effort in the most dangerous rods under the load, number of panels, the elastic characteristics of the material and the size of the structure are obtained. Node displacements are calculated using the Maxwell-Mohr integral formula. The forces in the rods of the construction are calculated in symbolic form using the Maple symbolic mathematics system. The double induction method is used to generalize partial solutions to arbitrary numbers of panels.