Equipment for Rational Securing of Cargo on Railway ... - Vinnova

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MariTerm AB 2004-01-30 jvgRASLA The “total <strong>for</strong>ce in parts <strong>of</strong> payload” is calculated according to the following example: The maximum <strong>for</strong>ce that can be supported by the end <strong>of</strong> a 70-tons Box car is shown below. Input data Payload (P): Maximum <strong>for</strong>ce per end (F): 70 ton 100 ton F 100 The <strong>for</strong>ce expressed in parts <strong>of</strong> the payload: = = 1. 4 P 70 The calculation gives thus a maximum allowable <strong>for</strong>ce on the wagon end <strong>of</strong> 1.4 times the maximum payload <strong>of</strong> the wagon. The <strong>for</strong>ce is distributed over the wagon end according to the table above. For wagons equipped with special cushioning devices, the above longitudinal <strong>for</strong>ces may be reduced. Flat wagons The bulkheads on Flat wagons shall be designed <strong>for</strong> a <strong>for</strong>ce equal to the design coupler <strong>for</strong>ce multiplied by 75 percent <strong>of</strong> the ratio <strong>of</strong> load limit to gross weight on rails. The <strong>for</strong>ce shall be considered as a uni<strong>for</strong>mly distributed load over the face <strong>of</strong> the bulkhead with a resultant at mid height. (C II - 4.1.13) An approximated calculation to give the maximum <strong>for</strong>ce that can be supported by the end <strong>of</strong> a 70-tons Flat car is shown below. Input data Payload (P): 70 ton Design coupler <strong>for</strong>ce (D): 5670 kN Load limit (L): 74 ton Gross weight on rails (G): 100 ton g: 9.81 m/s 2 L 74 Force on bulkhead (F): F = D × 75 % × = 5670× 0.75× = 3147 kN G 100 F 3147 The <strong>for</strong>ce expressed in parts <strong>of</strong> the payload: = = 4. 6 g × P 9.81× 70 The calculation gives thus a maximum allowable <strong>for</strong>ce on the wagon end <strong>of</strong> 4.6 times the maximum payload <strong>of</strong> the wagon. The <strong>for</strong>ce is uni<strong>for</strong>mly distributed over the face <strong>of</strong> the wagon end. 130
MariTerm AB 2004-01-30 jvgRASLA Bulkhead flat car 6.7 End stanchions 6.7.1 UIC An end stanchion should have a total length <strong>of</strong> 2400 mm and a cross-section <strong>of</strong> 100×80 mm all the way according to the figure below. Each end stanchion fitted to the wagon must withstand a <strong>for</strong>ce <strong>of</strong> 80 kN (8 ton) directed towards the outside <strong>of</strong> the wagon, applied 350 mm above the top surface <strong>of</strong> the floor. No residual de<strong>for</strong>mation is permitted. (ERRI RP 17/UIC 577) 80 kN 350 mm An approximated calculation to give the maximum <strong>for</strong>ce that can be supported by the end <strong>of</strong> a typical wagon (Rs 691) is shown below. The test <strong>for</strong>ce is recalculated being evenly distributed over the end stanchions. The calculations do not take any benefits from other possible distributions <strong>of</strong> the <strong>for</strong>ce into consideration. 131
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