Valuation of specific inertial forces to be used in calculations of the loads’ stability and holding fixtures
Holding fixture structures shall meet the regulatory strength requirements to ensure the required level of traffic safety and security of oversize and long loads (OLL) transported by railway transport. That’s why application of sound calculated values (considering special design features and technical conditions of transporter cars) of spatial forces, accepted by OLL and metal structural elements of holding fixtures is actual just as use of high-strength steels. Resulting from experimental investigation there were defined dependencies of OLL maximum acceleration amplitudes from in-train longitudinal forces. Using such dependencies it is possible to predict hauling overloadings in longitudinal direction at a project development stage of OLL transportation by railway transport. There are outlined recommendations on the values of inertial forces (specified for a load weighing 1 t) acting in longitudinal, vertical and lateral directions while in motion within a special train with dedicated locomotive at speeds up to 70 kph. These recommendations ought to be observed while calculating strength parameters of holding fixture metal structures for the positioning and fixing project of an OLL weighing 200 – 340 t on two coupled multi-axle transport units. With comparison results between OLL-accepted valuated inertial forces and corresponding experimental values one may state that there is an urgent need of updating current norms.