TO EVALUATION OF BOND BETWEEN REINFORCEMENT AND CONCRETE
Journal Title: Збірник наукових праць Українського державного університету залізничного транспорту - Year 2018, Vol 179, Issue 13
Abstract
The importance of addressing the issue of coupling reinforcement with concrete for the modern theory of reinforced concrete is substantiated. The most important drawbacks of the known methods for evaluating the bond strength of reinforcement to concrete have been analyzed. Particular attention is focused on bond estimating by average tangential stresses. It is substantiated why the linear dependence of these stresses on normal stresses in the reinforcement is not able to cover the processes of reinforcement bonding with concrete in the stage of reinforced concrete elements exploitation. The features of the stress state of the contact layer of concrete when pulling the reinforcing bar out of concrete at different stages of deformation of any reinforced concrete element are indicated. A universal dependence of the average tangential stresses for estimating the reinforcement bond to concrete at any stage of elements deformation is proposed. It is noted that the level of the average tangential tension of the clutch depends not only on the level of the stresses in the reinforcement, but also on the relative area of its active adhesion to the concrete. On the basis of theoretical and experimental values of the average tangential bonding stresses comparison, a statistical evaluation of the obtained dependence was made. The statistical analysis of the obtained dependence of the adhesion of reinforcing rods of different profiles and diameters with concrete of different classes, performed on the results of numerous experimental studies of domestic and foreign scientists, has shown the legitimacy of its use in practical calculations. The area of use of reinforcement bond with concrete average stresses dependence is defined. It seeks to clarify and significantly simplify the calculation of the crack strength of reinforced concrete elements, especially taking into account the level formation of normal cracks.
Authors and Affiliations
Olena Romashko, Vasyl Romashko
Keywords
Related Articles
- EP ID EP415299
- DOI 10.18664/1994-7852.179.2018.147756
- Views 65
- Downloads 0
RESEARCH OF OPERATIONAL PROPERTIES OF HIGH STRENGH LIGHTWEIGHT CONCRETE MODIFIED BY INTEGRATED ORGANIC AND SILICEOUS ADDITIVES
The article has the compound of high-lightweight concrete and research results of operational properties of lightweight concrete based on portland cement modified by a complex of organic-silica additives based polycarbox...
OPTIMIZATION OF CONSTRUCTION OF SCHEDULES OF HIGH-SPEED PASSENGER TRAINS IS IN RAILWAY UNITS
The optimal compilation of speed trains in railway junctions schedule is determined. The schedule allows release of compositions of high-speed trains to further their rational use at other railroad tracks to meet the pas...
THE STUDY OF THE DISTRIBUTION OF THE LOADING AND UNLOADING RESOURCES WHEN PERFORMING CARGO OPERATIONS
The analysis carried out in the work showed that a significant part of their turnover time freight cars are under the performance of cargo operations. These operations are the most laborious, complex and have a high cost...
FUNDAMENTAL SOLUTIONS ABOVE EQUATIONS OF THE PARAMETRIC OSCILLATIONS
We define the fundamental solution of the Mathieu equation for zero setting a and arbitrary parameters q using the method of direct integration. Along with the original Mathieu equation is considered tantamount to his...
ELECTRIC- AND VIBRATION INSULATION MATERIALS ON THE RAILWAY. THE POSSIBILITY OF THEIR PRODUCTION IN UKRAINE
In the article the problems and methods of protecting buildings from the effects of vibration, noise and stray and leakage currents that arise as a result of the movement of rail transport in urban development. Presents...