Experimental and Theoretical Investigation of Stress-Strain State and Bearing Capacity of the Inclined Sections of Damaged Reinforced Concrete Beams of Rectangular Cross-Section

Klymenko Y., Polianskyi K.

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https://doi.org/10.35579/2076-6033-2019-11-10

ABSTRACT

The article reports on the results of the experimental studies to determine the residual bearing capacity of inclined sections of reinforced concrete beams with concrete damages in compressed zone. 16 single-span freely supported experimental samples with dimensions of 100×200×1200 mm and the working span is 1000 mm were tested. The acted load on the samples was applied as a concentrated force at a shear span of 1d, 2d and 3d. Materials used for make samples are – concrete of grade C25/30, working longitudinal reinforcement of grade A500C Ø18 mm, constructive longitudinal reinforcement and transverse reinforcement in the form of vertical links ‒ Ø 6 mm of grade А240С. Artificial damages was lied at one edge of a depth of 0 mm, 50 mm and 100 mm, and with a tilt angle of 0˚, 30˚ and 60˚. All experimental samples are destroyed in inclined section. During the theoretical analysis of the data obtained, it was determined that this type of damage leads to a decrease in the residual bearing capacity and a changes in the stress-strain state - the neutral axis is tilted relative to the action of the force plane, the ultimate deformations of concrete increase, and the transverse reinforcement decreases. A decrease in the cut-off span from 3d to 1d leads to a significant increase in the bearing capacity, a decrease in the ultimate deformations of the concrete and transverse reinforcement. It is analyzed that among the studied factors, the shear span has the greatest influence, the depth of damage is less, and the angle of damage inclination influences the least.. An improved method for determining the residual bearing capacity of inclined sections of damaged rectangular beams is proposed, the maximum difference with experimental data was 28,13%, the coefficient of variation ν was 10,3%.

Keywords: damages in reinforced concrete, shear span, residual bearing capacity, limit deformations, tilt of the neutral axis, destruction, method of calculation.

For citation: Klymenko Y., Polianskyi K. Experimental and Theoretical Investigation of Stress-Strain State and Bearing Capacity of the Inclined Sections of Damaged Reinforced Concrete Beams of Rectangular Cross-Section. Contemporary Issues of Concrete and Reinforced Concrete: Collected Research Papers. Minsk. Institute BelNIIS. Vol. 11. 2019. pp. 147–163. (in Russian)

Full text in Russian:



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ISSN 2664-567X (Online)
ISSN 2076-6033 (Print)

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