Acoustic Emission Characteristics and Dynamic Damage Constitutive Relation of Shale-Ceramsite Concrete Subjected to Loading Tests

Wang, Shuren; Wu, Xiaogang; Yang, Jinbao; Zhu, Sen

doi:10.1061/(asce)mt.1943-5533.0003276

Cited by 24 publications

(9 citation statements)

References 19 publications

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“…After the compression damage data was input into ABAQUS, it can be converted into the plastic strain value ( ε pl c ) according to Equation (8). d c is calculated by Equation (9).…”

Section: Definition Of Concrete Damagementioning

confidence: 99%

“…Therefore, concrete creep patterns are of great theoretical and practical importance to structural analysis and design [8]. Moreover, the existing studies conclude that the creep characteristics of ceramsite concrete should be given sufficient attention [9] because the creep value of ceramsite concrete is larger than that of ordinary concrete and brings about a smaller creep coefficient.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Volume-to-Surface Area Ratio on the Creep Behavior of Steel Fiber Ceramsite Concrete Beams

Zhu

et al. 2022

Coatings

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To explore the influence of the volume-to-surface area ratio (V/S) on the creep of ceramsite concrete beams, the creep performance of ceramsite concrete beams with different V/S was studied through a long-term deformation observation test, theoretical derivation analysis and finite element modeling. First, by observing the creep deflection of ceramsite concrete beams with five different V/Ss for 180 days, the relationship between creep deflection and loading time as well as the influence of V/S on creep deflection were obtained. Then, referring to the ACI209 and ACI435 creep coefficient calculation formula, the creep theory of ceramsite concrete beams involving V/S was established. Finally, the numerical model was built according to the test parameters. The results showed that the growth rate of the creep of ceramsite concrete beams increased rapidly in the early stage, but gradually slowed down with the passage of time and tended to be stable after 120 days of loading. The V/S had a significant impact on the creep of ceramsite concrete beams. In the first 7 days, the creep growth rate of each beam was approximately the same. Thereafter, the higher the V/S was, the lower the creep became. After 28 days, the creep of ceramsite concrete beams with varied V/Ss showed sharp differences. After the V/S exceeded 30, the increasing V/S could effectively reduce the creep value and the creep growth rate under a long-term load. The calculated results were in good agreement with the measured values, which fully reflected its creep variation. The finite element simulation further verified the influence of V/S on the creep of ceramsite concrete beams and the reliability of the creep calculation formula.

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“…After the compression damage data was input into ABAQUS, it can be converted into the plastic strain value ( ε pl c ) according to Equation (8). d c is calculated by Equation (9).…”

Section: Definition Of Concrete Damagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Volume-to-Surface Area Ratio on the Creep Behavior of Steel Fiber Ceramsite Concrete Beams

Zhu

et al. 2022

Coatings

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“…Moreover, the ceramsite aggregate with water absorption/release characteristic on account of porous structure, could facilitate the hydration process, resulting in the densification of the microstructure [28]. Although the static and dynamic characteristics of LWSCC have been studied through experiments, the process and mechanism of damage have not been revealed [3,4]. Therefore, it is necessary to do mesoscale simulation research on LWSCC.…”

Section: State Of the Artmentioning

confidence: 99%

“…Lightweight concrete structures will inevitably be affected by earthquakes, impacts, and blasts during service, while their mechanical properties under dynamic loads are different from that under static loads [2]. The split Hopkinson pressure bar (SHPB) test has been applied to study the dynamic characteristics of LWAC, but the influence of the lightweight aggregate on damage evolution and energy dissipation cannot be quantitatively measured by laboratory tests [3,4]. As a kind of heterogeneous material, the performances of LWAC depend on the properties of the lightweight aggregate [5].…”

Section: Introductionmentioning

confidence: 99%

Meso-Scale Simulations of Lightweight Aggregate Concrete under Impact Loading

Wang¹,

Zhao²,

Wu³

et al. 2021

Int. j. simul. model.

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To reveal the damage evolution and energy dissipation characteristics of lightweight aggregate concrete (LWAC) under impact loading, some simulations of lightweight shale ceramsite concrete under high strain rate impact with a 3D meso-scale model were carried out. After the meso-scale model considering the randomness of the shape and distribution of lightweight aggregates being established and the material parameters of each component being determined by test results, the damage evolution and energy dissipation characteristics of the model under different strain rates were analysed. Results show that the damage evolution of LWAC can be divided into four stages from the perspective of energy. The large deformation and stress concentration firstly occur on the lightweight aggregates, which leads to the generation of micro-cracks. There is an upper limit of the strain energy density of the lightweight aggregate component. The energy absorption efficiency of the specimen first increases and then decreases with the increase of strain rates. The obtained conclusions can provide a reference for understanding the dynamic performances and damage mechanism of LWAC.

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“…For the numerical simulation study of structural explosion‐proof performance, the selection of a damage constitutive model and parameter determination of explosion‐proof materials are the key to determining the success of numerical simulation, and it is also the key to reproducing structural explosion‐proof characteristics under explosion impact loads, such as dynamic response and failure mode. At present, domestic and foreign scholars have mostly constructed constitutive models that can characterize the dynamic damage evolution behavior characteristics of different types of concrete materials by modifying the existing dynamic damage constitutive models of concrete materials and have achieved certain research results 9–13 . For example, Luo 14 modified the strengthening and toughening effect of steel fiber and the strain rate effect on the basis of the original Holmquist–Johnson–Cook (HJC) model to obtain an improved constitutive model of high‐parameter steel fiber‐reinforced concrete that could effectively characterize the dynamic characteristics of steel fiber‐reinforced concrete and confirmed that the reconstruction simulation results were in good agreement with the test results.…”

Section: Introductionmentioning

confidence: 97%

Study on steel fiber synergistically reinforced cellular concrete explosion‐proof effect in an underwater near‐field environment

Cao,

Qiu,

Huang

et al. 2023

Structural Concrete

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Based on the static and dynamic test results of steel fiber synergistically reinforced cellular concrete (SFSRCC) under a complex stress state, the yield surface equation and strain rate effect are modified to construct a modified Holmquist–Johnson–Cook (HJC) model suitable for the dynamic compression behavior characteristics of SFSRCC, and the modified HJC model is verified. At the same time, a finite width SFSRCC protective layer–roller compacted concrete (RCC) slab–water–explosive multimedia coupling model is established to explore the influence of setting different thicknesses of the SFSRCC protective layer (0, 0.1, 0.2, and 0.3 m) on the explosion‐proof performance and effect of the RCC slab structure. The results show that the heavy stress–strain curves and dynamic failure modes of the SFSRCC under different strain rates are in good agreement with the experimental results. The maximum errors of peak stress and peak strain between the simulation results and the experimental results are 1.04% and 6.6%, respectively, which confirms the validity of the HJC correction model and the accuracy of the simulation results. After setting different thicknesses of the protective layer, the RCC slab blast crater depth is reduced by 56.7%, 80%, and 93.3% compared with that at 0.18 m without a protective layer program, and almost no damage to the back explosion surface occurs. The failure volume ratio of the protected RCC slab structure gradually decreases from 38.53% to 3.24% with increasing protective layer thickness, and the protected RCC slab shows only slight damage after setting the protective layer. When the thickness of the protective layer is 0.3 m, the damage of the protected RCC slab structure is distributed in the surface area, which has little effect on the structural safety. These results show that the additional SFSRCC protective layer under the condition of underwater near‐field explosion can significantly reduce the damage degree of the slab structure and improve the explosion‐proof performance of the protected RCC slab structure. This research offers a theoretical reference for the explosion‐proof material selection and design of hydraulic structures and explosion‐proof application of SFSRCC under the action of underwater explosion impact loads.

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Acoustic Emission Characteristics and Dynamic Damage Constitutive Relation of Shale-Ceramsite Concrete Subjected to Loading Tests

Cited by 24 publications

References 19 publications

Influence of Volume-to-Surface Area Ratio on the Creep Behavior of Steel Fiber Ceramsite Concrete Beams

Influence of Volume-to-Surface Area Ratio on the Creep Behavior of Steel Fiber Ceramsite Concrete Beams

Meso-Scale Simulations of Lightweight Aggregate Concrete under Impact Loading

Study on steel fiber synergistically reinforced cellular concrete explosion‐proof effect in an underwater near‐field environment

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