Analysis Of Beam-rail Longitudinal Interaction Of The CWR On Existing Cable-stayed Bridge

With the deepening of the study of CWR on bridge and the rapid development of bridge technology, the application of the cable-stayed bridge in the railway is a growing trend. Because the cable-stayed bridge structure system is complex, the interaction between it and the CWR has many particularities. This paper selects the Hong-shui River cable-stayed bridge as the research background based on the Xiang-Gui railway expansion and reconstruction project, and conducts research works of beam-rail longitudinal interaction of the CWR on existing cable-stayed bridge.This paper determines a preliminary track structure plan for the CWR on the Hong-shui River cable-stayed bridge, and conducts discussions of the previous research works of those key calculation parameters.This paper establishes three models of the Hong-shui River cable-stayed bridge in ANSYS using the beam-rail longitudinal interaction theory and the finite element method as the theoretical basis. These models are the three-dimensional whole bridge model, the two-dimensional plane model and the no pier model whose longitudinal stiffness of fixed support base is sufficiently large. By conducting comparative analyses, this paper forms a clear understanding of how superstructure system spatiality and pier flexibility of the bridge affect the rail-beam longitudinal interaction, and of adaptation conditions of different models.This paper conducts necessary inspecting calculations, considers it necessary to explore other plans because the maximum rail-beam relative displacement of the ordinary fastener plan is too large that it will endanger the safety of the ballast bed, meanwhile condisers the broken gap inspecting calculation method proposed in "temporary regulation" is not safe.By establishing two models which considers or doesn’t consider fastener longitudinal resistance working together with ballast bed longitudinal resistance, this paper confirmes that it is reasonable to establish a mechanical rail-beam longitudinal interaction calculation model of the CWR on bridge which can comprehensively consider the interactions between rail, sleeper and bridge structure when using small resistance fasteners.This paper explores the effects of improving the force condition on rail and piers and of improving rail-beam relative displacement condition when small resistance fastener plan is adopted, and considers small resistance fastener plan the more suitable plan for the CWR on the Hong-shui River cable-stayed bridge from an economic standpoint.From a research perspective, this paper conducts a discussion of REJ plan, mainly on the modeling characteristics, and the influences of different setting locations do to the beam-rail longitudinal interaction.