Jointless turnout/bridge interaction under temperature effect: A scaled field test and its numerical modeling

摘要

Recently jointless turnout on bridges is a research focus and difficultypoint in Chinese Passenger Dedicated Line (PDL) construction. Due to the highrestriction of railway landform, jointless turnout on bridges or viaducts will be moreand more applied on PDLs. In this paper, a test model for three kinds of jointlessturnout on bridges was conducted with a scale of 1:3, in which different heating upfacilities were applied for model turnout, model track slab and model bridge,respectively. In this test, additional longitudinal forces and additional longitudinaldisplacements of stock rail, force-transferring components were measured in order toresearch the interaction between jointless turnout and bridges. Besides, a finiteelement model of turnout -track slab-bridge-pier was established, in which additionallongitudinal forces and additional longitudinal displacements of different componentswere able to be gained under the same load cases with model test in the system. Bycomparing the results of model test and theoretical compute, we can obtain that thetwo results have little differences and similar change rules, which primarily showscorrectness of calculating theory. Therefore, the calculating model and method forjointless turnout on bridges was considered to be reasonable.