Dynamic Increase Factor Research Articles

A dynamic bounding surface plasticity damage model for rocks subjected to high strain rates and confinements

A dynamic bounding surface plasticity damage model is developed for rocks with the consideration of high strain rates and confinements. This is achieved through adopting the strength surface of Holmquist-Johnson-Cook (HJC model)/ Johnson-Holmquist-ceramic (JH2 model) model as bounding surface, and employing the critical state concept for brittle-ductile transition. In addition, a simple continuum damage evolution law is taken for strength degradation and a simple vertical mapping rule is adopted to link current stress state with its corresponding strength state. A series of hardening rules that account for both plasticity and strain rate, and damage evolution law, etc., are proposed within the framework of consistent condition of dynamic model. A ‘S’ shape dynamic increase factor (DIF) function is adopted to consider the strain-rate effect of dynamic loadings, which aims to adjust the size of bounding surface with the consideration of radial enhancement. The proposed model is validated through modeling conventional triaxial compression tests under different confining pressures, dynamic triaxial tests, and Split Hopkinson Pressure Bar (SHPB) tests with various strain rates. Good agreement between modeling results and experimental data indicates that dynamic characteristics of rock, including rate and confinements dependency, are captured well by the proposed model. The proposed model is then implemented into a commercial software, GDEM, to simulate the stress wave propagation problem. Simulation results by the proposed model and two benchmark models are compared, which further validate the capability and applied potential of the proposed model.

Progressive collapse risk of steel framed building considering column buckling

Steel buildings are generally susceptible to the risk of progressive collapse in case one or a few load-carrying members are lost in an extreme event such as blast, impact, or fire. Thus, to avoid the catastrophic collapse of steel structures, it is imperative to investigate and learn from the performance of existing steel buildings for progressive collapse potential. The Ohio Union building, a multi-story steel-framed building that existed on the campus of Ohio State University, was tested earlier before its demolition by one of the co-authors for progressive collapse assessment under the successive removal of four columns located at the first-story level. The aim of this study is to conduct NLD (nonlinear dynamic) analysis for the building considering buckling of columns to numerically assess its potential for progressive collapse and then compare it with test observations. The calibrated finite element (FE) model was then extended to incorporate more hypothetical sequential and simultaneous column-loss scenarios. As one of the most widely accepted documents used among practicing engineers for numerical assessment of progressive collapse potential of buildings, the 2003 GSA (General Services Administration) guidelines were also applied. The simplified LS (linear static) analysis approach of the GSA guidelines was used for assessing the progressive collapse risk of the building, and the results were then compared with both test observations and NLD analysis. New dynamic increase factors (DIFs) are recommended for both force- and deformation-controlled actions to be used with the LS analysis.

Peridynamic modeling for impact failure of wet concrete considering the influence of saturation

In this paper, a modified intermediately homogenized peridynamic (IH-PD) model for analyzing impact failure of wet concrete has been presented under the configuration of ordinary state-based peridynamic theory. The meso-structural properties of concrete are linked to the macroscopic mechanical behavior in the IH-PD model, where the heterogeneity of concrete is taken into account, and the calculation cost does not increase. Simultaneously, the porosity of concrete is considered, which is implemented by deleting the bond between two material points, as well as the influence of porosity on the mechanical properties of concrete. Moreover, the effective bulk and shear modulus of cement mortar in wet concrete (saturated and unsaturated concrete) are calculated respectively. The dynamic model for wet concrete is described from three aspects: strength, dynamic increase factor, and equation of state. Validation of the proposed model is established through analyzing some benchmark tests and comparing with the corresponding experiment and other available numerical results.

Combined effects of cryogenic temperature and strain rates on compressive behavior of concrete

Concrete structures in extremely cryogenic environments may be subject to dynamic loadings as a result of occasional accidents or terrorist attacks during the service life. Considering the cryogenic temperature effect and strain rate effect of each phase for concrete, a meso-scale numerical model of the concrete subjected to cryogenic temperature and dynamic loadings was presented in this study, which serves as a preliminary foundation for calculating and evaluating the performances of concrete structures at cryogenic temperature. Taking concrete cube as an example, the dynamic compressive behavior and strain rate effect of concrete specimens at cryogenic temperature from 20 °C to –160 °C were modelled and investigated. The numerical results indicate that the failure appearances and compressive strength are highly related to the cryogenic temperature and dynamic loadings. The compressive strength at cryogenic temperature is greater than that at ambient temperature, and the sensitivity of dynamic compressive strength to strain rate is enhanced at cryogenic temperature. Moreover, the absorbed energy and dynamic elastic modulus tend to increase with the decrease of temperature and increase of strain rate. According to the numerical results, an empirical formula on dynamic increase factor of compressive strength at cryogenic temperatures (CDIF T) was established.

Research on the dynamic impact performance of polyurethane cement-based composite

The polyurethane cement-based composite (PUCC) has excellent mechanical properties and deformability, which has broad application prospects in civil engineering. However, the research on dynamic impact properties of PUCC is limited. Therefore, in this paper, 11 groups of PUCC specimens were prepared by using different content of basalt aggregate (BA), rubber powder (RP), and polyethylene fiber (PE). Then, the Split Hopkinson Pressure Bar (SHPB) was used to study the dynamic impact tests on PUCC specimens. The stress–strain curves, dynamic stress, dynamic increase factor (DIF), and compressive toughness of PUCC specimens under various strain rates were obtained. The results show that the PUCC has excellent dynamic impact resistance, and its dynamic stress can reach 2 to 3 times of ordinary concrete. The dynamic mechanical properties of the specimens decreased significantly when the BA was added. The dynamic stress, DIF, and compressive toughness decreased by 25%, 13%, and 50%, respectively. Different from BA, the dynamic stress, DIF, and compressive toughness were increased when the PE was added. The incorporation of RP would slightly reduce the dynamic peak stress. However, the DIF and compression toughness were significantly improved. When the content of RP was 40 wt%, the dynamic stress was reduced by 2.5%, while DIF and compressive toughness are increased by 45.7% and 18.7% respectively.

Structural effects and real strain-rate effects on compressive strength of sustainable concrete with crumb rubber in split Hopkinson pressure bar tests

The dynamic increase factor (DIF) of the concrete material strength, obtained using a split Hopkinson pressure bar (SHPB), includes structural effects that do not precisely reflect the real strain-rate effect of concrete. To further clarify the real strain-rate effects of rubberised concrete (RC), an experimental investigation regarding the dynamic compressive response of ordinary concrete (NC) and RC with three rubber contents (10%, 20%, and 30%) was performed in this study. Additionally, based on a dynamic constitutive model, i.e., the Karagozian and Case (K&C) concrete model, numerical SHPB tests were conducted using the LS-DYNA software. According to the experimental results, all parameters of the K&C model were discussed, and the damage factors were modified to satisfy the mechanical properties of RC. After validating the numerical model, it was observed that the experimental DIF included the inertial enhancement and the real DIF. Moreover, because rubber particles effectively reduce the density and improve the deformation capacity of concrete, the real strain-rate effect of RC was found to be more rate-sensitive than that of NC by analysing the radial stress distribution. In addition to lateral inertia, another external source, namely, the interface friction between the specimen and bars, which can produce lateral confinement, was further studied. It was found that interface friction significantly contributes to lateral confinement; however, as the strain rate increased, the impact generally decreased. Finally, the mechanism of the strain-rate effect of RC was clarified.

Dynamic response and collapse resistance of RC flat plate structures subjected to instantaneous removal of an interior column

Through quasi-static loading regimes, notable research efforts have been made in recent years towards understanding the structural behaviour and resistance mechanism of reinforced concrete (RC) flat plate structures against progressive collapse events. Nevertheless, dynamic responses, being an inherent nature of any progressive collapse, were unable to be adequately studied in these quasi-static studies. Moreover, fewer studies were performed on flat plate structures under dynamic loading conditions, especially their behaviours under large deformations, i.e., the post-punching stages. To fill this research gap, this paper presents three sequential dynamic tests performed on a 1/3-scaled 2 × 2-bay RC flat plate substructure specimen by instantaneously removing the interior column under three levels of additional gravity loads. In these tests, the substructure specimen was able to withstand the gravity loads up to 2.08 times the load capacities recommended by the DoD and GSA guidelines for nonlinear dynamic analyses. The dynamic responses of the specimen in the flexural, punching and post-punching stages were examined in detail. In addition, a high-fidelity finite element model was developed and validated by the experimental test results. The validated numerical model was subsequently used to quantify the dynamic load redistribution patterns, and the influences of two loading considerations (i.e., loading on the slab overhangs and load release time) on the dynamic responses were also investigated. Finally, the dynamic load increase effects were evaluated based on the analysis model results. The obtained load-based dynamic increase factors (DIFs) of the specimen under different gravity loads were between 1.11 and 1.46 in the pre-punching (flexural) stage, whereas they were no more than 1.06 in the post-punching stage.

Numerical analysis on collapse performance of post-tensioned concrete frames with post-tensioning BFRP bars under an interior-column-removal scenario

Basalt fiber reinforced polymer (BFRP) bars are ideal substitutes for steel reinforcement due to their excellent mechanical performance, which could avoid energy consumption and carbon dioxide emission during the production of construction steel. Concrete structures reinforced with BFRP bars encounter the collapse risk under an occasional accident, such as losing one or several load-bearing members. To date, little research has been performed on the collapse behavior of post-tensioned concrete frames with bonded post-tensioning BFRP bars. This paper developed finite element (FE) models of frame substructures with post-tensioning BFRP bars to investigate their collapse behavior under an interior-column-removal scenario. Parametric analyses show that arranging post-tensioning BFRP bars at the top and bottom of the frame beams or increasing the post-tensioning BFRP bars at the beam bottom could effectively improve the collapse resistance and deformability of the substructures, with the 96.6% and 51.9% improvement at the most, respectively. Reducing initial effective prestress is helpful to the deformability of the frame beams, resulting in a 56.9% increase in ultimate vertical deformation. A mixed reinforcement of BFRP bars and steel reinforcing rebars in the beams is beneficial in preventing collapse. In most cases, the beams’ flexural mechanism and catenary action are essential in resisting the collapse load. The ratio of the maximum vertical displacement at the failed interior column to the net span of the frame beam varies between 0.051 and 0.1. The calculation model for equivalent dynamic increase factors (DIFs) of collapse load was proposed, which could provide a reference for determining DIFs when static collapse analysis is conducted. The DIFs of collapse load for the substructure models were discussed in the proposed method based on the analytical results, indicating that DIFs approached 2.0 at the initial collapse stage and varied between 1.26 and 1.70 at the final collapse failure.

Research on Dynamic Compressive Performance of Polypropylene Fiber-Reinforced High-Strength Concrete under Freeze-Thaw Environment

Existing studies have proved that the incorporation of polypropylene fiber can effectively improve the impact resistance of concrete. In this paper, the split Hopkinson pressure bar and digital pulse shaping technology are used to further study the dynamic compression performance and constitutive relationship of concrete in the cold regions under the deteriorating effect of freeze-thaw cycle, and obtain the dynamic increase factor. Studies have shown that polypropylene fiber-reinforced high-strength concrete has a strain rate enhancement effect. The number of freeze-thaw cycle times at low strain rates has an obvious effect on concrete deterioration, and the effect is weaker at higher strain rates. By comparing three typical dynamic strength growth factor models with the test results, after revising the model, the dynamic increase factor equations under different freeze-thaw circulation times were fitted. This research provides a basis for the design of durability and robustness of building structures in cold regions.

Blast resistance of timber structural elements: A state-of-the-art review

The response of structures subject to impulsive loads remains a field of intense research. Whilst traditional construction materials, such as steel and concrete/masonry, have been the focus of most studies, further research on the performance of alternative materials for blast-resistant applications has been driven by their growing use in sustainable construction. Over the last years, engineers have been re-evaluating the use of timber as a prime construction material for a range of building types, from small office to high-rise residential buildings. As a result, there is now a growing need to study the blast resistance of timber structures, as they may become potential targets of terrorist attacks or being placed in the blast-radius of other critical buildings. A review of existing research on the blast resistance of timber structures is presented and key factors on the blast analysis and design of such structures are discussed. Most of the research has been conducted on light-frame wood stud walls, glued- and cross-laminated timber, and addresses material properties under high strain rates, typical failure modes, behaviour of structural connections and retrofitting solutions. Failure modes are reported to be highly dependent on the element layout and manufacturing aspects, and dynamic increase factors for the modulus of elasticity and maximum strength in the ranges of [1.05, 1.43] and [1.14, 1.60], respectively, have been proposed for different timber elements. Mechanical connectors play a significant role in dissipating energy through plastic deformation, as the brittle nature of timber elements compromises the development of their full capacity. Regardless the element type, SDOF models can accurately predict the dynamic response as long as idealised boundary conditions can be considered. Overall, although a good amount of research is available, more extensive research is needed to guide the design and engineering practice and contribute to the development of design codes and testing standards for timber structures under blast loading.

Dynamic shear response of ultra-high-performance fiber-reinforced concretes under impact loading

Ultra-high-performance fiber-reinforced concrete (UHPFRC) is known as an advantageous material for enhancing the shear response capacity of structures subjected to extreme loads, such as in cases of missile strikes, terrorist attacks, or earthquakes. However, there is limited information on the shear response of UHPFRC, especially at high strain rates. In this study, the shear strength, shear strain capacity, and shear peak toughness of UHPFRCs with three fiber types, i.e., twisted fiber (LT), hooked fiber (LH), and smooth fiber (LS), were investigated at static and at high strain rates (up to 245 s−1). The results indicated all UHPFRCs exhibited shear strain hardening behavior accumulated to multiple microcracks at both static and high strain rates although their shear responses were found to be strongly dependent on the fiber type. Among the investigated fiber types, the LT fibers produced the highest shear resistance in terms of shear strength, shear strain capacity, and shear peak toughness at static rates, whereas LS fibers did at high strain rates. The LS fibers exhibited the highest strain rate sensitivity of shear resistance, followed by the LH and LT fibers. Unlike LS fibers, LH and LT fibers showed fiber breakage during the shear loading process at high strain rates. Based on the experimental results, empirical equations to predict the dynamic increase factor (DIF) of shear strength of UHPFRCs at high strain rates were also proposed.

Effect of recycled polymer fibre on dynamic compressive behaviour of engineered geopolymer composites

To enhance the cost-effectiveness and sustainability of engineered geopolymer composites (EGC), polyvinyl alcohol (PVA) fibres in EGC can be partially replaced with recycled tyre polymer (RTP) fibres. This paper presents a systematic experimental study on the effects of PVA fibre volume fraction (1.0%, 1.5% and 2.0%) and RTP fibre content (0.25%, 0.5%, 0.75% and 1.0%) on the dynamic compressive behaviour of EGC under various strain rates (54.43–164.13 s−1). Results indicate that the flowability, quasi-static compressive strength and elastic modulus of EGC reduce with the increase of PVA fibre content, where the reductions can be effectively mitigated by adding RTP fibres. The dynamic compressive properties of all investigated mixtures including dynamic compressive strength, dynamic increase factor (DIF) and energy absorption capacity show a pronounced strain rate dependency which can be well described using the proposed equations for DIF against strain rate ranging from 10−5 s−1 to 103 s−1 with R2 values of mostly greater than 0.9. The dynamic compressive properties of EGC are enhanced with the increasing PVA fibre dosage under various strain rates while replacing PVA fibre with a certain amount of RTP fibre (0.25% and 0.5%) can result in better dynamic compressive properties compared to EGC with 2.0% PVA fibre. EGC containing 1.75% PVA fibre and 0.25% RTP fibre can be considered as the optimal mixture given its superior quasi-static and dynamic compressive properties in comparison with EGC with 2.0% PVA fibre.

High-strain rate tension behavior of Fiber-Reinforced Rubberized Concrete

This paper investigates for the first time the high-strain rate splitting tension behavior of Fiber-Reinforced Rubberized Concrete (FRRC). Splitting tension tests were performed on Φ100-mm specimens. Quasi-static tests were carried out using conventional quasi-static loading with a compressive testing machine and dynamic high-strain rate tests with a Φ80-mm Split Hopkinson Pressure Bar (SHPB) for strain rates up to 10s−1. The experimental program comprises the characterization of Plain Concrete (PC), Fiber Reinforced Concrete (FRC), Rubberized Concrete (RuC), and FRRC with a full test matrix (a total of 240 specimens) covering fiber contents up to 1.5% and rubber volume substitution ratios up to 30%. A high-speed camera was used to capture the cracking development processes together with Digital Image Correlation (DIC). The addition of fibers enhances the deformation capacity with a marked increase in the tensile strength both for quasi-static and dynamic conditions while the substitution with rubber aggregates significantly reduces the tensile strength with a similar enhancement of the deformation capacity. For FRRC, a combination of the two effects was observed. FRC, RuC, and FRRC are characterized by marked strain rate dependency within the considered test range. Furthermore, data-driven models for compression and tension strength reduction factor (SRFc and SRFt) and tension Dynamic Increase Factor (DIF) are proposed for different types of FRRC. Finally, a discussion on the image-based damage development processes is provided based on the high-speed camera videos. This study indicates that FRRC has an excellent high-strain rate tension behavior reducing and controlling the crack propagation.

Dynamic uniaxial compression testing of veined rocks under high strain rates

The occurrence of strainbursts is of major concern in underground deep mining operations. Strainbursts are complex events characterized by a spontaneous strain-energy liberation at the boundaries of underground excavations, putting both the long-term safety of operations and exposing workers to risk. In this study, we reported a series of uniaxial compression tests by using a split Hopkinson pressure bar (SHPB) and a high-speed camera, to understand the role of dynamic loads and high strain rates (10–102 s-1) in the mechanical behavior and fracture patterns of veined rocks. The samples are representative of major deep underground mine districts in Chile: Chuquicamata (QS), Andina (RB), and El Teniente (CMET). Results show a clear increase in the dynamical uniaxial strength concerning quasi-static values. The increase was up to 2,2 times in CMET, 1,8 in RB, and 2,6 in QS. Additionally, the dynamic increase factor (DIF) indicates a strong strain rate dependency of the QS samples. This effect on RB and CMET samples is less evident. The data obtained with dynamic compressional testing indicates that both the increase in stiffness and dynamical compressive strength depends largely on the rock strain rate dependency. Further, we report a direct relationship between fracture patterns and the presence of veinlets. We suggest that fractures propagate through the matrix when the mechanical properties show a strong strain rate dependency, whereas are restricted to veinlets and veins when this dependence is less evident. Thus, as stress pulses enhance the stiffness, the energy dissipation increases, and the proneness of block formation is higher. These are conditions favoring strainbursts occurrence and might increase the severity of this phenomenon in underground excavations.

Influence of mixture design parameters on the static and dynamic compressive properties of slag-based geopolymer concrete

This study investigated the influences of water-to-binder mass ratio (0.44, 0.47, and 0.50), and waterglass (8%, 12% and 16%) and fly ash (0%, 25% and 50%) contents on the slump, cubic compressive strength, and static and dynamic compressive behaviors of slag-based geopolymer concrete (GC). Static compressive tests were carried out by using an electro-hydraulic servo-controlled compressive test system, and dynamic ones were performed by using a split Hopkinson pressure bar (SHPB) apparatus. The specimens with a wide range of the compressive strength (from 50 MPa to 80 MPa) were prepared. The results show that the workability of fresh slag-based GC increased with increasing water-to-binder ratio, and waterglass and fly ash contents. The cubic compressive strength increased with the decreases of water-to-binder ratio and fly ash content, and the increase of the waterglass content. Increasing waterglass content contributed to the improvement of the static compressive behavior of slag-based GC, such as elastic modulus and peak stress, while it led to the rise of the brittleness. Slag-based GC with different water-to-binder mass ratios, and waterglass and fly ash contents showed a strong strain-rate dependency. However, the inclusion of 50% fly ash induced a sharp increase of the dynamic compressive strength and dynamic increase factor (DIF) at a high strain rate. Moreover, both the two formulations for fitting static compressive stress-strain curve and DIF with higher accuracy were proposed in this study.

Research on Dynamic Strength and Inertia Effect of Concrete Materials Based on Large-Diameter Split Hopkinson Pressure Bar Test.

The Split Hopkinson Pressure Bar (SHPB) test device is an important tool to study the dynamic characteristics of concrete materials. Inertial effect is one of the main factors that cause inaccurate results in SHPB tests of concrete materials. To solve this problem, Large-diameter SHPB tests on concrete and mortar were performed. A dynamic increase factor (DIF) model considering strain rate effect and inertia effect was established. This model provides a scientific reference for studying the dynamic mechanical properties of concrete materials. The experimental results indicate that the strain rate effect of concrete is more sensitive than that of mortar, but the inertia effect of mortar is more sensitive than that of concrete. Under the same strain rate, the energy utilization rate, average fragment size, and impact potentiality of mortar are higher than concrete.

Strain rate effect on tensile strength of glass fiber-reinforced polymers

This study presents the tensile properties of glass fiber-reinforced polymer (GFRP) composites under dynamic loadings. The dynamic tensile tests were performed via a high-speed servo-hydraulic testing machine with a velocity ranging from 1 m/s to 15 m/s, corresponding to a strain rate range between 4.9 s−1 and 93.7 s−1. The effects of the strain rate on the tensile strength and dynamic increase factor (DIF) were considered. The results showed that the tensile strength and DIF of GFRP increased with the strain rate. The failure pattern of GFRP was discussed via a group of high-speed camera images. The results of this research can provide useful information for future construction, e.g., protective structures under extreme impacts.

Experimental research on the dynamic compressive properties of lightweight slag based geopolymer

The present study aims at preparing lightweight slag based geopolymer (LW-SG) and studying its mechanical properties under dynamic and quasi-static loads. Firstly, three LW-SG with different densities were prepared by replacing the slag with expanded perlite (EP). Secondly, the density, wave velocity and pore structure of LW-SG with different EP contents were tested. Thirdly, the mechanical properties under quasi-static and dynamic loads were compared. Finally, the effects of the strain rate and EP content on the mechanical properties and failure modes of LW-SG were discussed. The results showed that with the EP contents increase, the dry density and longitudinal wave velocity gradually decreased, while the porosity increased. In addition, the quasi-static compressive strength and elastic modulus of LW-SG increased with curing ages, but decreased with EP contents increased. The dynamic compressive strength, dynamic increase factor, strain energy density and damaged degree of LW-SG all showed an increasing tendency with the strain rates increase, which exhibits an obvious strain rate dependence. Under the same strain rate, the dynamic compressive strength and strain energy density decreased with the EP contents increase, while the damaged degree increased with the EP contents increase.

Impact behaviour of fly ash and slag-based geopolymeric concrete: The effects of recycled aggregate content, water-binder ratio and curing age

Using recycled concrete aggregate as substitution for natural aggregate in geopolymeric concrete to produce geopolymeric recycled aggregate concrete (GRAC), is becoming a desirable solution to handle the huge amount of construction and demolition waste, meanwhile, can harness the eco-friendly benefits from geopolymer binders. This study aims to investigate the dynamic compressive behaviour of GRAC based on fly ash and ground granulated blast furnace slag, focusing on the effects of recycled coarse aggregate (RCA) content (0, 50% and 100%), water-binder ratio (0.3, 0.4 and 0.5) and curing age (7 days and 28 days). By using a Ø100-mm split Hopkinson pressure bar apparatus, extensive experimental investigations were carried out for understanding the impact properties of GRAC under different strain rates ranged from 30 s−1 to 150 s−1. The compressive properties of GRAC under impact loading, including failure modes, stress-strain curves, compressive strength and energy absorption capability were analyzed and compared to those under quasi-static loading. Then, a new model has been developed for the dynamic increase factor (DIF) of GRAC. The results show that GRAC exhibited a lower strain rate sensitivity than OPC-based concrete, and the addition of RCA improved the strain rate sensitivity of geopolymeric concrete. The dynamic compressive strength and impact toughness of geopolymeric concrete decreased with increasing RCA content and water-binder ratio. The proposed model, which considered the effect of RCA content to predict the DIF of GRAC, agreed well with the test results.

Experiment and mesoscopic modelling on the dynamic compressive behaviors of a new carbon fiber-reinforced cement-based composite

This paper presents an experimental and numerical study on the compressive behaviors of a new carbon fiber-reinforced cement-based composite (CFRCC) that is composed of magnesium oxysulfate cement, carbon fiber and some chemical admixtures. Parametric studies on the effects of carbon fiber content and strain rate on the compressive behaviors of CFRCC, are conducted using a series of quasi-static and dynamic compressive tests. The research item includes the failure morphology, stress-strain curve, dynamic increase factor (DIF), etc. Besides, a three-dimensional (3D) mesoscale modelling approach is proposed to simulate and analyze the mechanical responses and the failure mechanisms of CFRCC subjected to dynamic compressive loading, where the random dispersion of chopped fibers are realistically considered. The results indicate that the cracking and failure modes of CFRCC are significantly affected by the bridging effect of carbon fibers randomly dispersed in cement matrix. With the increase of fiber content, the dynamic peak stress and peak strain of CFRCC at similar strain rates show an increasing and decreasing trend, respectively. An evident strain-rate hardening effect could be found on the initial elastic modulus and the peak stress of CFRCC as well. While the relationship between the DIF of CFRCC and the logarithm of strain rate could be described using a quadratic function. Moreover, the mesoscale modelling approach has been validated by a good agreement between the numerical and tested results, demonstrating the feasibility of the developed mesoscale model in simulating and investigating the dynamic behaviors of CFRCC. All in all, the CFRCC has proven to be of great significance in resisting to impact loads, and more insights should be provided into its dynamic properties.