scholarly journals SAFETY OF REINFORCED CONCRETE BRIDGES WITH SPANS STRUCTURES

2019 ◽  
Vol 15 (6) ◽  
pp. 922-932
Author(s):  
Y. V. Krasnoshchekov
Keyword(s):  
Reinforced Concrete ◽  
Reliability Analysis ◽  
Progressive Collapse ◽  
Dynamic Effect ◽  
Concrete Bridges ◽  
Structural Systems ◽  
Regulatory Requirements ◽  
Design Standards ◽  
Emergency Situations ◽  
Reinforced Concrete Bridges

Introduction. The author presents the results of the reliability analysis of the structural systems in spans of bridges.Materials and methods. The analysis of published materials for the purpose of using them in the design of reinforced concrete bridges, in connection with changes in design standards and tightening of regulatory requirements for safety is made by the author.Results. The results of surveys of slab superstructures indicate the reliability and durability of typical structures operated under normal conditions, but in emergency situations there is a danger of progressive collapse. Therefore, in such conditions, split schemes of multi-span structures are unacceptable. The research tasks to ensure the durability of slab superstructures are formulated. In particular, the task of developing the method of durability calculation in case of one of the pillars failure in the continuous span structure, taking into account the dynamic effect is illustrated.Discussion and conclusion. Changes in design of slab structures of bridge cause the necessity to study the reliability and failure in emergency situations.

scholarly journals ASSESSMENT OF TECHNICAL STATE AND DESIGN OF RECONSTRUCTION OF THE SMALL BRIDGE OF THE SLOVINSKY SYSTEM

2020 ◽  
pp. 52-65
Author(s):  
V.H. Kvasha ◽  
◽  
A.Ya. Muryn ◽  
L.V. Salyichuk ◽  
◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Concrete Cover ◽  
Concrete Bridges ◽  
Technical State ◽  
Design Standards ◽  
Reinforced Concrete Bridges ◽  
Current Design ◽  
Design Solutions ◽  
Bridge Reconstruction ◽  
Former Ussr

Abstract. In the 1950s and 1960s of the 20th century a lot of one- and two-span bridges with a span of 4-6 m were built on public roads on the territory of the former USSR. The paper describes the features of the design and construction of small four-hinged reinforced concrete bridges on lightweight supports of engineer Slovinsky system. The experience of surveying small bridges shows that in the context of a limited funding, compared to other types of bridges, maintenance and operation of these bridges does not get enough attention. There are relatively low material losses from their destruction and it is possible to restore them fairly easily. Therefore, many of them have a large number of defects and are in a poor physical condition. The purpose of the work is to draw attention of owners to the problems of small bridges using a specific example, as well as to present effective constructive solutions for the reconstruction of a small four-hinge bridge. These design solutions are developed on the basis of the research and development in Lviv National Polytechnic University and include the use of a reinforced concrete cover slab. The slab has been frequently used in other bridge reconstruction projects and proved its technical and economic efficiency in practice. The article gives characteristics of the bridge, the technical state of its structures, the main defects and damages, as well as the characteristics of the stream and its influence on the condition of the bridge. The design solutions for widening and strengthening the small bridge of the Slovinsky system can provide operational performance and consumer properties in accordance with the requirements of the current design standards for new bridges. These standards are able to ensure the service life of the reconstructed bridge.

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