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| Research on the Key Desi^^n Parameters of Sleeper for 40 t Axle - load Heavy Haul Railway |
| HU Lian - jun1，YANG Ji - zhong1，FENG Du - bei1，ZHANG Lei1，XIAO Fa - ming2 |
| (1. China Railway Eryuan Engineering Group Co. Ltd， Chengdu， Sichuan 610031， China; 2. Venezuela Branch of China Railway Engineering Corporation，Beijing 100039，China) |
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Abstract Abstract : Research purposes ： The increases of axle load deteriorate service environment of concrete sleeper greatly on heavy haul track. For inquiring the key design parameters of sleeper witli the effect of 40 t axle load， more accurate three - dimensional wheel - rail contact and track finite element models were established. By analyzing the stress change rule of sleeper， some measures to improve the carrying capacity of sleeper were put forward， which could provide valuable data for future designs of heavy haul track structures. Research conclusions:(1) When 40 t axle - load heavy haul train passed with the speed of 120 km/h，maximum stress on rail seat of sleeper was 9. 21 MPa，within compressive strength limit 12 MPa of C60 concrete. (2) The carrying capacity of sleeper was controlled by its sagging moment. With the speed of 120 km/h，the sagging moment of sleeper could achieve 18.99 kN ? m，which was very close to the maximum sagging moment 19.05 kN ? m of type ! sleeper. By widening or lengthening type ! sleeper，as well as its weight should be increased to more than 350 kg，it could meet the requirements of 40 t axle - load heavy haul train. (4) Taking into account the construction costs and ballast gauges and otiier factors，widening sleeper should be prior. After widening 10 cm，the sleeper could bear at least the maximum sagging moment 23.52 kN ? m，the maximum hogging moment - 22. 87 kN ? m. (5) The research results could provide the references for tlie concrete sleeper design of 40 t heavy haul rail'way.
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Received: 24 February 2017
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2017, Vol. 34 
