Influence of climate conditions on stresses in CWR on the bridges in Serbia

Abstract

Vehicle/track/bridge interaction causes additional stresses in CWR on the bridge, which include stress in rails due to temperature changes in the bridge deck, vertical bending of bridge deck, and braking/acceleration of railway vehicles on the bridge deck. Critical analysis of additional tensile stresses in CWR on the bridge using Smith diagram was performed and presented in this paper. Furthermore, results of rail temperature measuring at several monitoring locations in Serbia were presented. The influence of the local climate conditions and neutral rail temperature on the temperature stress in CWR was analysed. The paper points out that the prescribed values of additional stresses in CWR have to include influence of real local climate conditions on track stability on the bridge.

Interakcija vozilo/kolosek/most dovodi do dodatnog naprezanja u kontinualno zavarenim šinama na mostu, što uključuje napone u šinama usled temperaturne promene u konstrukciji gornjeg stroja mosta, napone u šinama usled savijanja konstrukcije gornjeg stroja mosta u vertikalnoj ravni pod saobraćajnim opterećenjem, kao i napone u šinama usled pokretanja/kočenja železničkih vozila na mostu. U radu je predstavljena kritička analiza dodatnih napona zatezanja u kontinualno zavarenim šinama na mostu pomoću Smitovog dijagrama. Osim toga, predstavljeni su rezultati merenja temperature na nekoliko mernih mesta na železničkoj mreži u Srbiji. Analiziran je uticaj lokalnih klimatskih uslova i neutralne temperature u šini na napone od temperaturne promene u kontinualno zavarenim šinama. U radu se ističe da propisane vrednosti dodatnih napona u kontinualno zavarenim šinama moraju uključiti uticaj stvarnih lokalnih klimatskih uslova sa aspekta stabilnosti koloseka na mostu.