Determination of the Mechanical Characteristics and Specific Fracture Energy of Thermally Hardened Reinforcement

Zhang, Q.; Mol’kov, Yu. V.; Sobko, Yuriy; Blikhars’kyi, Ya. Z.; Khmil, Roman

doi:10.1007/s11003-015-9789-9

Cited by 24 publications

(10 citation statements)

References 3 publications

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“…A significant number of works tackled the construction of a complete stress-strain curve for steel [25][26][27]. In particular, paper [25] reported the results from a standard test of steel with an imitation of corrosion damage.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

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Formation of a complete stress-strain curve of concrete using digital image corellation

Blikharskyy

Pavliv

2021

EEJET

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This paper reports the development and verification of a new procedure for formation of a complete stress-strain curve of concrete with a downward region of strain by using a digital image correlation method. A new technique to build spectle patterns on the surface of concrete is described. That makes it possible to accurately enough reproduce the spectle patterns on the surface of concrete and perform a high-quality analysis of strains involving digital image correlation. The advantages of this research technique have been established when predicting the formation of internal cracks in concrete followed by their propagation. In addition, using the digital image correlation methodology makes it possible to obtain strains of the entire studied plane of the sample at each stage of loading. This procedure provides an opportunity to investigate a change in strains and the movement of individual points or areas when studying concrete surfaces. That is a relevant issue as it enables more detailed diagnostics of existing reinforced concrete structures. To check the accuracy of this procedure application, a mechanical gauge with an accuracy of 0.001 mm was additionally installed. 2 high-speed monochrome CCD cameras with different lenses were used in determining concrete strains involving the digital image correlation technique. The deformations were controlled with a period of time every 250 ms. The load was controlled by an additional third camera with a speed of 50 frames/second. The result of the experimental study is the formed full concrete destruction diagram with a downward region of strain. The deviation of the results of strains based on the mechanical gauge with an accuracy of 0.001 mm with a base of 200 mm from those acquired by the digital image correlation procedure was mainly up to 10 %, which confirms the reliability of the results. The results of this work allow a more accurate calculation of reinforced concrete structures in the practice of design, inspection, or reinforcement of existing structures

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…However, that does not allow for an analysis based on experimental results. The solution to this issue is presented in paper [27]. A procedure for analyzing steel stretching involving construction of a stress-strain curve using digital image correlation was used.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Formation of a complete stress-strain curve of concrete using digital image corellation

Blikharskyy

Pavliv

2021

EEJET

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“…Nowadays, there is the great number of works which analyze possibilities to improve the reinforced concrete structures' properties and increase their durability [10,11]. However, a significant number of buildings and structures require renovation and strengthening [12,17]. There could also often appear problems with fire resistance in steel-concrete and composite-reinforced structures, which is not typical for structures strengthened with a reinforced concrete casing [18][19][20].…”

Section: Analysis Of Recent Studies and Publicationsmentioning

confidence: 99%

Determination of the Charring Rate of Timber to Estimate the Fire Resistance of Structures at Real Temperature Modes of Fires

Shnal

Pozdieiev

Sidnei

et al. 2020

Lecture Notes in Civil Engineering

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The article presents the results of researches of fire resistance of timber structures, taking into account the realistic temperature modes of fires. The proposed method of determining the charring rate is based on the main parameters of fire spread that are taken into account in the calculations, based on the analysis of the heating temperature of unprotected elements of timber structures, where an approach on solving an time-dependant equation of thermal conductivity is used. The research of the influence of the depth of the charring on the limit of fire resistance depends to a lesser extent on the coefficient of slots but to a greater extent it depends on the density of the fire load. Thus, the difference for the beam with a cross section of 150 Â 300 was 15 min under varying density of the fire load, and for different slot coefficients it is not more than 5 min. Provided that the density of the fire load is less than 690 MJ/m2 for a beam with a cross section of 150 Â 300, the limit of fire resistance does not occur at all. The proposed method allows more accurate determining of the limit of fire resistance of timber structures as it takes into account both the main parameters of fire spread and thermal-physical characteristics of the timber.

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“…Physical and mechanical characteristics of materials of the experimental beams are given in Table 1. Steel stretch was tested by the standard method, however the method using digital image correlation becomes more popular nowadays [13]. For the reinforcement of beams, types of skeletons with different percentage reinforcement of the operating rebar of the lower stretched zone were used.…”

Section: Test Specimen Description and Materials Propertiesmentioning

confidence: 99%

Bearing capacity of RC beams reinforced with high strength rebars and steel plate

et al. 2018

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Nowadays, reducing the material content of not only buildings and structures in general, but also individual constructions is a topical task that can be realized through the use of high-strength concrete and reinforcement, as well as with the use of external reinforcement. The concentrated location of sheet reinforcement on the external the most tense facets of steel and concrete structures increases the operating height of the cross-section, makes it possible to more effectively use the strength properties of steel in comparison with conventional reinforced concrete, and with the same bearing capacity to economize on expenses. Composite and monolithic reinforced concrete structures with external reinforcement are used in various construction sectors around the world. This contributed to the expansion of the use of reinforced concrete for special buildings of power-engineering and hydrotechnical construction. The technical nd econom efficiency, as well as the possibility of using external rebar as formwork for monolithic concrete construction, have been proved. Therefore, there is a need for the study of structures with combined reinforcement, in which high rigidity of steel and concrete structures is combined with an effective use of high-strength reinforcing bars (rebar) without prior tension

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Determination of the Mechanical Characteristics and Specific Fracture Energy of Thermally Hardened Reinforcement

Cited by 24 publications

References 3 publications

Formation of a complete stress-strain curve of concrete using digital image corellation

Formation of a complete stress-strain curve of concrete using digital image corellation

Determination of the Charring Rate of Timber to Estimate the Fire Resistance of Structures at Real Temperature Modes of Fires

Bearing capacity of RC beams reinforced with high strength rebars and steel plate

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