Perspective constructions of bridge overpasses on transport main lines

Abstract. When designing bridges on motorways and railways, conventional beam or trussed design schemes of structures made of steel or reinforced concrete are used, but at present there is a significant increase in the speeds of motion of individual vehicles, axial loads and total train weight increase, and temporary intervals between trains. These factors lead to a significant increase in dynamic effects and necessitate the use of non-classical design schemes for artificial structures of transport infrastructure. In this study, it is proposed to take a threespan arch bridge with suspended central span structure as the basis for unified bridge overpass. Such an arrangement will allow changing the design length of the central span in a fairly wide range, reducing the total number of supports with an increase in the total length of the bridge overpass, and using a similar design as a double-track railroad, two- or four-lane motorway bridge. Calculations carried out and the results obtained for calculating displacements, internal forces and stresses in the units and elements of the proposed bridge overpass design allow concluding about the allowable limit values of the values found, sufficiently uniform load of all its main elements, the absence of strongly marked large-scale stress concentrators. Proposed design allows setting different sizes of spans during the design, reducing the number or even avoiding the installation of channel supports, adapting this structure for the passage of both rail and road transport. Design of the bridge, mathematical model of which is described in detail in the article, can be manufactured at the factory, and then delivered to the installation site and mounted there, which significantly reduces the final construction cost and makes it a profitable solution, for example, for arranging railway interchanges at different levels.

1. Gridasova E.A., Nikiforov P.A., Grishin A.V., Tal'skikh K.Yu., Sukhorada A.E. Effect of high-frequency loading on the structure of low carbon steel. Science and Technology in Transport, 2017, no. 2, pp. 82–91.

2. Gridasova E.A., Nikiforov P.A., Grishin A.V. Changes in the structure of low-carbon steel at high-frequency effects. Vnedrenie sovremennykh konstruktsiy i peredovykh tekhnologiy v putevoe khozyaystvo [Introduction of modern structures and advanced technologies in track facilities], 2017, Vol. 11, no. 11, pp. 30–36.

3. Software complex “MIRAGE” for the calculation of structures on the PC. User's Manual. Kyiv, NIIASS Publ., 1995, 420 p. (in Russ.).

4. Zenkevich O. Finite element method in engineering. Moscow, Mir Publ., 1975, 543 p.

5. Loktev A.A., Bakhtin V.F., Chernikov I.Yu., Loktev D.A. Method of determining external defects of a structure by analyzing a series of its images in the monitoring system. Vestnik MGSU, 2015, no. 3, pp. 7–16.

6. Gorodetskiy A.S., Zavoritskiy V.I., Lantukh-Lyashchenko A.I., Rasskazov A.O. Finite element method in the design of transport facilities. Kyiv, Fakt Publ., 2005, 344 p.

7. Korenev B.G., Rabinovich I.M. Dynamic calculation of buildings and structures. Designer's Guide. Moscow, Stroyizdat Publ., 1984, 303 p.

8. Belutskiy I.Yu., Lapin A.V. Adaptation of the finite element model of the overpass span to the actual operation conditions of the structure. Structural Mechanics and Analysis of Constructions, 2017, no. 5 (274), pp. 28–31.

9. Babkova N. Bridge building: modern technologies. SAPR I graphika [SAPR and graphics], 2012, no. 2 (184), pp. 50–52.

10. Polyakov V.Yu. Synthesis of optimal spans for high-speed line. Structural Mechanics and Analysis of Constructions, 2016, no. 3 (266), pp. 35–42.

11. Rossikhin Yu.A., Shitikova M.V., Loktev A.A. The analysis of thin-walled building structures subjected to impact excitation. Proceedings of the 4th International Ph.D. Symposium in Civil Engineering. Munich, 2002, pp. 487–492.

12. Loktev A.A., Sychev V.P., Poddaeva O.I., Potapov A.V., Talashkin G.N. Simulation of a bridge tunnel to pass cars through infrastructure. Science and Technology in Transport, 2017, no. 1, pp. 73–78.

13. Alfimtsev A.N., Loktev D. A., Loktev A.A. Comparison of methodologies for developing systems of intellectual interaction. Vestnik MGSU, 2013, no. 5, pp. 200–208.