Alex M Remennikov;Sakdirat Kaewunruen;
<正>Railway sleeper is a main part of railway track structures.Its role is to distribute loads from the rail foot to the underlying ballast bed.There is a widespread suspicion based on the industry experience that railway concrete sleepers have reserves of strength that are untapped.It is thus important to establish the spectrum and amplitudes of ultimate forces applied to the railway track in order to understand more clearly the manner in which track components including concrete sleepers respond to those forces.Cracks in concrete sleepers have been visually observed by many railway organizations.The principal cause of cracking is the infrequent but high-magnitude wheel loads produced by a small percentage of"bad"wheels or railhead surface defects.Those loads are of short duration but of very high magnitude. Current design philosophy for prestressed concrete sleepers is based on permissible stress design approach,which does not consider the actual dynamic loads on tracks. In order to devise a new limit states design concept for concrete sleepers,the research efforts are required to perform comprehensive studies of the loading conditions,the static behaviour,the dynamic response,and the impact resistance of the prestressed concrete sleepers. This paper presents the results of experimental and numerical studies aimed at predicting the dynamic responses of railway concrete sleepers.Experimental data also provided information on the failure modes for railway prestressed concrete sleepers under static and impact Ioadings.A high-capacity drop weight impact testing machine was constructed at the University of Wollongong to evaluate the ultimate capacity of prestressed concrete sleepers under impact loads.Energy absorption capacity of the prestressed concrete sleepers was evaluated to determine the amount of energy required to fail the sleeper under impact load.Static and impact tests were carried out using the Australian-manufactured prestressed concrete sleepers.
Impact Loading;;Concrete Sleepers;;Limit States Design;;ANSYS;;LS-Dyna
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