Effect of impact loading on residual flexural capacity of high-strength reinforced concrete beams

Dok, Gökhan; Çağlar, Naci; İlki, Alper; Yılmaz, Cemal

doi:10.1016/j.istruc.2020.08.054

Cited by 21 publications

(18 citation statements)

References 52 publications

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“…As mentioned in the Introduction, the results of previous studies (Adhikary et al 2015b;Liu et al 2017;Dok et al 2020) on the load capacity of damaged beams were different. Adhikary et al (2015b) examined the reduction in load capacity with an increase in the impact energy.…”

Section: Flexural Capacitymentioning

confidence: 94%

“…Moreover, the displacement ductility also decreased with an increase in the impact energy. Despite the efforts of these previous studies, except for one test case conducted by Dok et al (2020), the impact energy level used in the previous studies was less than 10 kJ, which is low compared with that of actual accidents, such as rockfalls, which can have impact energies above 50 kJ (Yu et al 2021). Furthermore, there have been insufficient experiments on the residual performance of RC members subjected to impact loads.…”

Section: Introductionmentioning

confidence: 99%

“…Based on the test results, the flexural strength and secant stiffness of the impact-damaged beams increased at a low impact energy level but decreased with an increase in impact energy. Dok et al (2020) carried out static 1 Postdoctoral Fellow, Dept. of Civil, Architectural and Environmental Engineering, Univ.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, there have been insufficient experiments on the residual performance of RC members subjected to impact loads. Liu et al (2017) and Dok et al (2020) conducted only four tests. As previously mentioned, the results for some residual behaviors, such as the residual flexural strength and stiffness observed in previous studies, contradict with each other.…”

Section: Introductionmentioning

confidence: 99%

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Residual Performance of Reinforced Concrete Beams Damaged by Low-Velocity Impact Loading

Lee

Ahn

et al. 2023

J. Struct. Eng.

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With the advancement of material science and infrastructure design technology, there is an increased need to reflect various loading scenarios in the design of civil infrastructures, including extreme loads such as impact and blast. However, structural behavior under extreme loads has been observed to be very different from that under static loads due to the high-rate loading condition. Therefore, extensive experimental and analytical studies have been conducted to explain the structural behavior under impact loading. From these efforts, various discussions have been presented on the impact behavior and the evaluation of the impact resistance of structures. However, despite the fact that the repair or reinforcement of structures damaged by impact loads is a critical issue, studies of the residual performance of impactdamaged structures are insufficient. This paper presents an experimental study to improve the understanding of the residual performance of impact-damaged structures. A total of 29 RC beams were tested under static loads to examine the effect of impact-damage on the residual behavior of RC beams. Of these, 8 RC beams were intact, and the other 21 RC beams suffered impact loading through drop weight impact tests and were damaged prior to the static flexural tests. The residual performance was evaluated by comparing the maximum load capacity, flexural stiffness, and displacement ductility of impact-damaged beams and intact beams. The comparison indicated that the flexural stiffness and displacement ductility of the impact-damaged RC beams decreased significantly, whereas their flexural strengths did not exhibit a significant difference. Predictive models for flexural stiffness and displacement ductility of the impact-damaged beams were suggested from the test results, and through these, the residual performance of the impact-damaged structure could be evaluated.

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Section: Flexural Capacitymentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Residual Performance of Reinforced Concrete Beams Damaged by Low-Velocity Impact Loading

Lee

Ahn

et al. 2023

J. Struct. Eng.

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“…At present, there are many studies on the impact test and numerical simulation of ordinary reinforced concrete columns [16][17][18][19][20], beams [21][22][23][24][25][26], and walls (plates) [27][28][29][30][31][32][33]. Civil air defense engineering shear walls play an important role in civil air defense engineering structures and are also the main force components under impact loads.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study and Numerical Analysis on Impact Resistance of Civil Air Defense Engineering Shear Wall

Shi

Zhang

et al. 2021

Advances in Civil Engineering

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In order to study the impact resistance of civil air defense engineering shear wall, the impact resistance of civil air defense engineering shear wall was studied by combining finite element numerical simulation with pendulum impact test. The effects of impact height, pendulum mass, and impact times on the impact resistance of civil air defense engineering shear walls were analyzed. It was shown that when the impact height increased from 0.4 m to 2.5 m, the failure mode of civil air defense engineering shear wall tended to be local impact failure, and the horizontal displacement in the middle of the wall span increased. The concrete crushing occurred in the impact area of the back of the civil air defense engineering shear wall. The increase in the impact height is a negative factor for the impact resistance of the civil air defense engineering shear wall. With the increase of pendulum weight, the number of concrete horizontal cracks in the back of the civil air defense engineering shear wall increased, while the number of vertical cracks decreased, but the impact surface was destroyed. Through multiple impact tests on the civil air defense engineering shear wall, the civil air defense engineering shear wall had accumulated damage. The longitudinally loaded steel on the back reached the ultimate strength, and there are large cracks at the bottom and even collapses. The increase of impact times has a great influence on the impact resistance of the civil air defense engineering shear wall. Through the analysis of the factors affecting the impact resistance of civil air defense engineering shear wall, it provides guidance for civil air defense engineering shear wall to resist impact load.

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Effect of load details of the successive explosions on the blast behaviors of reinforced concrete beams

Xu,

Liu,

Huang

et al. 2023

Structural Design Tall Build

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SummaryThe objective of this study was to study the effect of load details of successive explosions on the blast behaviors of reinforced concrete (RC) beams. First, the effect of the successive loading of two identical explosions was discussed by considering the influences of standoff distance, charge mass on the failure states, and structural responses (displacement and support reaction force). And keeping the total TNT charge mass of 1 kg unchanged, the effect of loading numbers was investigated by loading two 0.5 kg TNT successively and a single 1 kg TNT on RC beams, respectively. Besides, the successive loading of two different explosions was also considered by investigating the effects of loading sequences and the first explosion induced pre‐damage on the ultimate accumulated damage of RC beams. At last, based on the reaction force and displacement responses, a nonlinear relationship between the dynamic residual load‐carrying capacity and the accumulated residual displacement was obtained to assess the damage states of the tested beams. The results show that the local failure range along the beam span direction (length of peeling‐off and length of spallation) caused by the first blast load did not apparently increase when the damaged beams were subjected to another blast load. With the increase in explosion numbers, depth of compressive crushing increases gradually. At the same stand‐off distance (from 0.25 to 0.45 m), due to the damage accumulation effect, successive loading of two 0.5 kg TNT can trigger more severe local failure but smaller accumulated residual deflection to beams than the single loading of a 1 kg TNT. Besides, when two different blast loads are loaded on tested beams, the loading sequence of the larger one first and then the smaller one (1 kg TNT/0.5 kg TNT at h = 0.45 m) can trigger larger damage to beams than the opposite loading sequence (0.5 kg TNT/1 kg TNT at h = 0.45 m). And for the beams subjected to a smaller blast load first and then a larger one, a stiffer behavior may be triggered by the second blast load on the beam after the first loading of the smaller blast load due to the residual strain in longitudinal reinforcement. Furthermore, based on the nonlinear relationship between residual load‐carrying capacity and residual displacement, the accumulated damage of RC beams was divided into mainly four phases.

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Effect of impact loading on residual flexural capacity of high-strength reinforced concrete beams

Cited by 21 publications

References 52 publications

Residual Performance of Reinforced Concrete Beams Damaged by Low-Velocity Impact Loading

Residual Performance of Reinforced Concrete Beams Damaged by Low-Velocity Impact Loading

Experimental Study and Numerical Analysis on Impact Resistance of Civil Air Defense Engineering Shear Wall

Effect of load details of the successive explosions on the blast behaviors of reinforced concrete beams

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