DOI: 10.33868/0365-8392-2020-2-262-43-47
© Vitalii Yastrubinetskyi, Candidate of Technical Sciences,
Leading Researcher, ORCID: 0000-0002-4837-3303,
e-mail: desbridge40@gmail.com (DerzhdorNDI SE);
© Petro Koval , Candidate of Technical Sciences, Professor,
Department Chair, ORCID: 0000-0002-0040-5900
(National Academy of Fine Arts and Architecture);
© Serhii Zavhorodnii, Research Officer,
ORCID: 0000-0003-1928-4544, e-mail: zav_ss@ex.ua;
© Maksym Borysenko, Research Assistant,
ORCID: 0000-0001-9772-3536, e-mail: y-max@meta.ua
(DerzhdorNDI SE)
SOME FEATURES OF THE OPERATING CONDITION OF REINFORCED CONCRETE BRIDGES AND REINFORCED CONCRETE RUNNING STRUCTURES BRIDGES ACCORDING TO LOAD CAPACITIES
Abstract. When determining the operating condition of the bridge, one of the determining factors is to ensure its reliable and trouble-free operation.
Therefore, the establishment of the actual load capacity of the bridge is an important procedure on which depends the correct assessment of its operational condition. The method of estimating the load capacity of bridges takes into account the calculation of individual random variables, such as physical and mechanical properties of materials, characteristics of temporary loads, etc., and this gives inaccuracies in determining the load capacity of the structure as a whole. Therefore, it is proposed to determine the load-bearing capacity of girder structures of bridges by the probabilistic method, which allows to more objectively determine the load-carrying capacity according to current standards while ensuring the required level of reliability, and to identify and use load-bearing capacity reserves of reinforced concrete beams. Reinforced concrete girder structures of road bridges on the roads of Ukraine, the mass construction of which began in the 50-60s of the last century, mainly consist of prefabricated beams or slabs, which were manufactured in specialized industries. During the period of mass design and construction of bridges in the USSR from the middle of the twentieth century, it was impossible to perform the spatial calculation of the girder structure with the then existing means of computer technology. Developers of typical designs of girder structures of bridges used approximate semi-empirical methods. The participation of a single beam (slab) in the work of the girder structure was estimated by the socalled «coefficient of transverse installation».
Well known methods of spatial calculation of reinforced concrete bridge spans for their load capacity determination of are considered. During multi-beam spans calculation it is proposed to determine the estimated forces in certain beams proportionally to the deflections of these beams. During the calculation of steel reinforced concrete spans it is also proposed that the total tensile stresses along the lower edge to be taken as the designed factors.
Keywords: load capacity, road bridge , span construction, spatial calculation.
References
1. Snitko, V. P. (2012). Determination of load-bearing capacity of
span structures of reinforced concrete bridges. «Roads and road
construction»: coll. Science. etc. NTU. – Kyiv, 85, 174-184.
2. Klyuchnik, S. V. (2018). On the issue of load capacity of old span
structures. Bridges and tunnels: theory, research, practice: coll. Science. etc. DNUZT them. acad. Lazaryan, Dnepropetrovsk, 13, 12-24.
3. Vasiliev, A. I. (2016). Estimation of load capacity and durability of
bridges: a manual. Moscow, MADI, 40.
4. Valiev, S. N. (2004). Determination of load-bearing capacity of
reinforced concrete span structures of road bridges by the probabilistic method. Bulletin of the Moscow Automobile and Road Institute (State Technical University). Moscow, MADI, 3, 78-83.
5. NTU. (2012). Guidelines for assessing and forecasting the technical
condition of road bridges: DSTU-N B B.2.3-23: 2012. Kyiv.
6. Evgrafov, G. K., Bogdanov, N. N. (1966). Design of bridges. Moscow,
Transport, 692.
7. Polivanov, N. I. (1970). Design and calculation of reinforced concrete and metal road bridges. Moscow, Transport, 516.
8. Livshits, Ya. D., Onishchenko M. M., Shkuratovsky A. A. (1986).
Examples of calculation of reinforced concrete bridges. Kyiv, Higher
School, 263.
9. Ulitsky, B. E., Ignatiev, E. G., Rubinchik, R. I. (1971). Spatial calculations of span structures of bridges, obliques and curves in plan. Moscow, Transport, 168.
10. Smirnov, A. F., Alexandrov, A. V., Shaposhnikov, N. N., Lashchenikov, B. Y. (1964). Calculation of structures using computers. Moscow, 381.
11. Ministry of Regional Development of Ukraine. (2009). Bridges and
pipes. Loads and effects: DBN B.1.2-15: 2009. Kyiv.
12. Ulitsky, B. E., Vasiliev, A. I., Shestoperov, G. S. (1975). Spatial
calculations of reinforced concrete bridges taking into account nonlinear deformations. Moscow, Transport, 62.
13. Yastrubinetsky, V. L. (1970). To the calculation of reinforced
concrete prestressed span structures of bridges, taking into account the nonlinear dependence between stiffness and load. The dissertation for the degree of candidate of technical sciences. Moscow, 160.