Experimental and numerical investigations on ultra-high toughness cementitious composite slabs subjected to close-in blast loadings

Xu, Sheng; Chen, Bokun; Li, Qinghua; Zhou, Fei; Yin, Xing; Jiang, Xuguang; Wu, Ping

doi:10.1016/j.cemconcomp.2021.104339

Cited by 29 publications

(6 citation statements)

References 54 publications

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“…With increasing and up to relatively high strain rates, the ultimate tensile strength increases, and the tensile strain capacity decreases. It was observed that the ultimate tensile strength and tensile strain capacity were significantly related to the strain rate effect by the above test results and previous studies [48,49] with the same test method. The dynamic increase factor (DIF) was calculated by the dynamic ultimate tensile strength divided by the ultimate tensile strength under quasi-static tension.…”

Section: Quasi-static and Dynamic Mechanical Properties Of Eccsupporting

confidence: 81%

Impact Performance of RC Beams Reinforced by Engineered Cementitious Composite

2023

Buildings

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To mitigate potential damage to RC structures subjected to impact load—especially spalling damage—engineered cementitious composite (ECC) is applied, with the aim of reinforcing the RC members, so as to improve their impact performance. In the present study, the response of beams, with and without ECC reinforcement, to impact loading was investigated. Firstly, the mechanical properties of the ECC were characterized by quasi-static compression and tension tests, as well as by dynamic direct tension tests. Then, the K&C model (Karagozian and Case Concrete Model) was employed to delineate the ECC behavior, whose parameters were calibrated using the test data. Subsequently, models of RC beams with and without ECC reinforcement, validated using the drop weight test, were established to investigate the impact response. The numerical results suggested that the performance of the impact resistance of the ECC-reinforced RC beams was significantly improved. The damage degree of the ECC-reinforced members was effectively reduced, the degree of deformation was effectively controlled, and the energy consumption capacity was significantly increased while the impact load and transferred load increased. In particular, the method of multiple separate layers as reinforcement, proposed in this study, was found to reduce effectively the response and damage extent, improve the energy dissipation, and control the impact load and transferred load within certain levels. In addition, the multiple separate ECC layers effectively prevented the crack propagation caused by the cracking of the member, ensured the residual integrity of the member, and further improved the performance of the impact resistance of the member comprehensively.

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Section: Quasi-static and Dynamic Mechanical Properties Of Eccsupporting

confidence: 81%

Impact Performance of RC Beams Reinforced by Engineered Cementitious Composite

2023

Buildings

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“…Current research on the response and failure mechanisms of concrete structures under explosive impact loads primarily employs numerical simulation methods to explore the analysis of target damage and fracture [14][15][16][17][18][19][20]. However, numerical simulation methods typically require a substantial amount of computational resources due to complex mathematical modeling and large-scale iterative calculations [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Virtual simulation of fracture behavior of concrete blocks under blast loading

Ning,

Zhang,

2024

Preprint

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Utilizing advanced visualization techniques to simulate and replicate the response of concrete block under various explosive loads is of significant importance for investigating and predicting the fragmentation and fracture behavior of concrete materials. In this study, a scenario visualization method is introduced combining virtual simulation and mathematical theoretical modeling, which can vividly characterize the destruction process as well as the damage characteristics of the concrete block subjected to impact. The fragmentation theory model provided, based on the theorem of energy conservation, could analyze and predict the fundamental characteristics of secondary fragments of concrete blocks under blast loading, such as the quantity, quality and the initial velocity of fragmentation. Furthermore, the movement trajectory and 3D dynamic effects of flying concrete fragments after the explosion were finely and real-time simulated using the physics engine, which significantly enhanced the realism and reliability of the visualization. Also, to characterize the damage features of concrete block, the crushing model of concrete block was established by using Voronoi diagram technique, and the damage levels was given according to the degree of destruction. The developed virtual simulation system not only offers the capability to observe the damage process of concrete block from various perspectives and scales, but also efficiently and accurately analyzes and predicts the destructive behavior and dynamic response under impact loads, and it has significant potential applications in architectural engineering design and safety assessment, providing a new perspective for understanding and exploring the mechanisms of destruction and fracture in concrete materials.

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“…ECC is created by incorporating high-performance fibers, such as polymer fibers or metal fibers, into the cementitious matrix, which grants it the ability to exhibit tensile strain-hardening and multiple cracking properties. The excellent toughness and cracking resistance properties of ECC [7] enable it to effectively absorb inputted energy and distribute stresses, thereby protecting the structure from severe local damage caused by dynamic loadings, such as spalling, scabbing, and perforation [8][9][10]. Strain-hardening cementitious composites (SHCC), ultra-high toughness cementitious composites (UHTCC), ultra-high ductility cementitious composites (UHDCC), and ultra-high ductility concrete (UHDC) can all be referred to as ECC.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Performance of Engineering Structures under Dynamic Disasters with ECC–FRP Composites: A Review at Material and Member Levels

Zhao,

Chen,

Sun

2023

Buildings

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Dynamic loadings arising from impact, explosive, and seismic disasters impose high requirements on the performance of engineering structures during service periods. Engineered cementitious composite (ECC) exhibits exceptional toughness and crack resistance, while fiber-reinforced polymer (FRP) possesses lightweight and high-strength properties. ECC and FRP composites show promising potential in enhancing the resilience of existing structures under dynamic disaster scenarios. However, most research on ECC and FRP has primarily focused on static properties, while investigations of dynamic properties are limited. This paper provides a comprehensive review of the dynamic properties of ECC and FRP composites followed by a summary of studies conducted on the dynamic behavior of ECC and FRP strengthened members, which provides valuable insights for further research on these materials and their applications in strengthening structures under dynamic disasters.

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Experimental and numerical investigations on ultra-high toughness cementitious composite slabs subjected to close-in blast loadings

Cited by 29 publications

References 54 publications

Impact Performance of RC Beams Reinforced by Engineered Cementitious Composite

Impact Performance of RC Beams Reinforced by Engineered Cementitious Composite

Virtual simulation of fracture behavior of concrete blocks under blast loading

Enhancing Performance of Engineering Structures under Dynamic Disasters with ECC–FRP Composites: A Review at Material and Member Levels

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