Operation of Damaged H-Shaped Columns

Klymenko, Yevhenii; Kos, Željko; Grynyova, Iryna; Maksiuta, Olena

doi:10.1007/978-3-030-57340-9_24

Cited by 12 publications

(8 citation statements)

References 11 publications

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“…Such adaptation of the strain procedure (Fig. 3) makes it possible to calculate the stressed-strained state closer to the real operating conditions, compared to other studies [6,12,18,25]. However, it should be noted that the calculation of bending elements in which damage occurs at high loads levels (70 % or more of their bearing capacity) (Table 4) cannot be carried out.…”

Section: The Results Of Calculating Control and Damaged Reinforced Concrete Beamsmentioning

confidence: 97%

“…All further studies are related to the change of initial parameters, first of all, the reinforcement of structures by classical methods [10] and modern materials [11]. After passing these stages, it is usually the stage of research into structures in which damage occurs [12] as one of the parameters for changing the initial (project) stressed-strained state. Such studies are extremely complex and require longterm research [13].…”

Section: Introductionmentioning

confidence: 99%

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Development methodology of determinating residual carrying capacity of reinforced concrete beams with damages tensile reinforcement which occurred during loading

Vegera

Vashkevych

Blikharskyy

et al. 2021

EEJET

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This paper reports the improved and verified procedure for calculating reinforced concrete beams affected by damage to stretched reinforcement when loaded. The main results from testing the reinforced concrete beams with damage in the stretched zone in the form of one hole in the reinforcement in the middle of the beam are given. The variable parameter of the study was the level of load resulting in the damage. It acquired values of 0, 30 %, 50 %, 70 % of the bearing capacity of control undamaged samples. Overall, the results of testing 12 samples are given. A new procedure has been proposed for taking into consideration changes in the mechanical characteristics of stretched reinforcement arising from its damage. This makes it possible to more accurately establish the bearing capacity of reinforced concrete bended elements affected by damage to their reinforcement during operation. The analysis of the calculation, compared with experimental quantities, led to a conclusion that the strain model could determine when the bearing capacity of reinforced concrete beams without damage and with damage to working reinforcement is exhausted. Based on the improved algorithm, the principle of using a strain model was proposed to establish when the bearing capacity of damaged samples, taking into consideration the effect of the load level, is exhausted. The theoretical estimation, considering when the bearing capacity is exhausted, showed results that are 3...21 % less than the experimental values, which ensures reliability of calculation of such structures. The proposed calculation provides a new approach to determining the bearing capacity of reinforced concrete beams damaged during operation. That, in turn, makes it possible to more accurately determine the residual bearing capacity of structures and increases the safety of their operation.

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Section: The Results Of Calculating Control and Damaged Reinforced Concrete Beamsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Development methodology of determinating residual carrying capacity of reinforced concrete beams with damages tensile reinforcement which occurred during loading

Vegera

Vashkevych

Blikharskyy

et al. 2021

EEJET

View full text Add to dashboard Cite

show abstract

“…A large number of works have been devoted to researchers of buildings structural elements, including building elements. The authors would like to highlight the following ones «The Method of Calculating the Bearing Capacity of Compressed Stone Pillars» and «Operation of Damager H-Shaped Columns» [2,3] For comparison, 18 structural and technological solutions for the construction of enclosing structures were selected, namely, walls made of the following materials:…”

Section: Resultsmentioning

confidence: 99%

Development of cost-effective enclosing structures with high heat transfer resistance

2021

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Considered is the solution to the problem of choosing an economical option for the construction of low-rise buildings and the creation of new economical design solutions with high thermal performance. The well-known technologies of building construction are analyzed using qualitative, quantitative and comparative analysis. Quantitative indicators were selected, such as wall thickness, weight of 1 m2 of wall, resistance to heat transfer, area of premises, cost, durability, tendency to shrinkage. As qualitative indicators used: seasonality of the use of solutions, resistance to the formation of mold, decay and destruction, especially the delivery of building materials. The method of multi-criteria analysis was also applied to determine the most effective technology. Calculated the cost of various types of design solutions based on economic calculated simulations. The technological solutions were assessed by quantitative criteria on a ten-point scale, where the minimum and maximum values were assigned points 1 and 10, respectively. Graphic modeling of the compared construction options was carried out and the corresponding diagrams were built. Added “weight” coefficient of criteria for the final decision on the choice of the optimal technology for the construction of buildings. The most effective constructive solution was selected based on the results of a comparative analysis, taking into account the “weight” coefficient.

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“…The use of downward concrete deformation curve is relevant for the calculation of reinforced concrete structures damaged during operation [8,9]. To determine the bearing capacity of damaged reinforced concrete columns at different cross-sections and the percentage of damage, a complete concrete destruction curve is required [10,11]. Given the complexity and heterogeneous properties of reinforced concrete [12], the calculation of damaged structures is more difficult compared to damaged metal structures [13].…”

Section: Introductionmentioning

confidence: 99%

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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Operation of Damaged H-Shaped Columns

Cited by 12 publications

References 11 publications

Development methodology of determinating residual carrying capacity of reinforced concrete beams with damages tensile reinforcement which occurred during loading

Development methodology of determinating residual carrying capacity of reinforced concrete beams with damages tensile reinforcement which occurred during loading

Development of cost-effective enclosing structures with high heat transfer resistance

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

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