Experimental Study of Concrete Normal Mode Cohesive behavior at the Centimeter Scale

Lhonneur, Joffrey; Youssoufi, Moulay Saı̈d El; Jamin, Frédéric; Monerie, Yann; Pelissou, Céline

doi:10.1016/j.prostr.2022.12.065

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…From the results of the numerical simulation, it can be seen that the plastic spacer influenced the development of the cracks in the concrete specimen substantially only with the third variant, i.e., the simulation with the highest blast loading of 600 g of TNT (Figure 18). The development of cracks in Figures 16-18 is indicated with the color legend of blue to red, where blue indicates no crack in the material is present, while red indicates that the crack reached the width, where there is no residual load capacity between the material elements [30][31][32]. The latter cracks are fully developed, mostly in the center and diagonal directions of the specimen without the plastic spacer (Figure 18a), while in the specimen with the plastic spacer (Figure 18b), the development of the cracks occurred less in the center and also in a rectangular pattern throughout the whole specimen, which corresponds with the cracks' development in the specimen obtained from the experimental testing (Figures 3-5).…”

Section: Jones-wilkins-lee Equation Of Statementioning

confidence: 99%

The Effect of Bottom Reinforcement Spacers on Reinforced Concrete Structures Loaded by Explosion

Zezulová,

Dubec,

Dvořák

et al. 2023

Buildings

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Plastic spacers create a linear and systemic weakening of the structure. The extreme loading of the structure tests the structure itself to its load-bearing limit or even locally exceeds this limit, thus revealing all its weak points, which are the spacers. Nevertheless, the influence of the spacers is not included in the design calculation of the reinforced concrete element. In addition, products intended as spacers for the placement of reinforcement do not belong to the specific families of construction products covered by a harmonized standard of European parliament regulation. For these reasons, it is not required to demonstrate any characteristics of these products. This fact allows the use of arbitrary spacers’ shapes and materials. As shown by the experiment carried out, the use of commonly used plastic liners will result in a weakening of the cross-section. The normal assessment of the ultimate or serviceability limit state is not affected by this weakening. An example of an experiment carried out where this problem was captured is the subject of this paper. With Europe’s current deteriorated safety situation, understanding the influence of spacers in blast-loaded reinforced concrete structures on structural failure is important, and it is appropriate to further address this issue. Based on this experiment, it is not possible to accurately identify the causes of the explosion cracks. In order to determine with certainty the effect of spacers on the strength of the structure under abnormal blast loadings, research needs to focus on this area. In the field experimental measurements and numerical simulations, it was found that the use of linear spacers has an effect on crack formation under the blast action of the tested slab.

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Section: Jones-wilkins-lee Equation Of Statementioning

confidence: 99%

The Effect of Bottom Reinforcement Spacers on Reinforced Concrete Structures Loaded by Explosion

Zezulová,

Dubec,

Dvořák

et al. 2023

Buildings

View full text Add to dashboard Cite

show abstract

“…The other part of the crack tip at the microscopic level of cohesion, resulting in the material cracking, is not immediately after the complete disconnection. This part is the cohesive zone (cohesive zone), as shown in Figure 4 [30].…”

Section: Cohesive Zone Model (Czm) 421 Fundamentalsmentioning

confidence: 99%

Simulation Analysis of the Fracture of Reinforcement Concrete Columns Using High-Voltage Pulse Discharge

Wang,

Sun,

Wang

2023

Buildings

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High-voltage pulse discharge (HVPD) in liquid technology, when applied to the demolition of concrete structures, has the advantages of green environmental protection, saving energy, emission reduction, safety, reliability, etc. However, research on the influence law of various factors on the effect of crushing is still insufficient. Therefore, this manuscript equated the shock load caused by HVPD to the blasting load and introduced a cohesive zone model based on ABAQUS. The whole process of a concrete column being subjected to a shock wave generated by pulse power discharge was simulated and analyzed. To validate the model’s reasonableness, a comparison and analysis were conducted with the results of experimental studies on concrete column fractures caused by HVPD in liquid. The study further investigated the influence of three parameters—one-side longitudinal reinforcement ratio, volume hoop ratio, and concrete grade strength—on the degree of fracture of the concrete column with a single row of holes (i.e., the width of transverse cracks or longitudinal cracks around the drilled holes). The simulation results revealed that the width of transverse cracks decreases significantly with the increase in the one-side longitudinal reinforcement ratio of the column, while the width of longitudinal cracks decreases substantially with the increase in the volume hoop ratio of the column. In addition, the degree of fracture of concrete columns decreases slightly with the increase in the concrete grade strength. Based on the simulation results, the mathematical expressions between the crack widths (transverse crack width and longitudinal crack width) and the key parameters, such as the one-side longitudinal reinforcement ratio of the column, volume hoop ratio of the column, and concrete grade strength, were established, respectively. These expressions facilitate their practical application in engineering practice.

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Experimental Study of Concrete Normal Mode Cohesive behavior at the Centimeter Scale

Cited by 2 publications

References 7 publications

The Effect of Bottom Reinforcement Spacers on Reinforced Concrete Structures Loaded by Explosion

The Effect of Bottom Reinforcement Spacers on Reinforced Concrete Structures Loaded by Explosion

Simulation Analysis of the Fracture of Reinforcement Concrete Columns Using High-Voltage Pulse Discharge

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