Concrete Damaged Plasticity Model Research Articles

Investigation into the quasi-plasticity damage model for concrete with micropores based on peridynamics

The non-linear performance of concrete is determined by the heterogeneous micro-structure of concrete. The existing methods mainly focus on numerical simulation of concrete at meso-scale. In view of this, the micro-calculation model based on bond-based peridynamics (BBPD) was established by the MATLAB-ABAQUS co-simulation method. In this study, based on the concrete plastic damage model in ABAQUS, combined with the quasi-brittle damage model and the basic characteristics of BBPD, a quasi-plasticity damage model was proposed which is suitable for the simulation of concrete. The calculation results show that the micro-model based on BBPD can well reflect the mechanical properties of concrete, and the crack propagation path is affected by the heterogeneity of concrete. At the same time, the quasi-plasticity damage model was established in which the mechanical behaviour of concrete in compression/tension can be considered simultaneously. For the distribution of pores, with the reduction of large capillary pores, the crack path inside the concrete is significantly simplified, and the distribution of cracks is significantly reduced. It can improve the mechanical behaviour of the material by optimising the pore structure and reducing the distribution of large pores.

Numerical study on mechanical erosion behaviour of the burning-free Al2O3–C bottom nozzle during casting

The burning-free bottom nozzle is a novel component for accurately controlling the molten steel flow during the casting steel process. The effect of the thermal mechanical behaviour of burning-free Al2O3–C bottom nozzle materials under extreme temperatures during casting on the thermally induced failure was investigated. First, the high-temperature dynamic Young's modulus and thermal expansion of the bottom nozzle materials were tested in the temperature range of 300–1473 K. A composite material constitutive model, a thermal conductive model and the concrete damage plasticity model (CDP) were adopted to examine the mechanical erosion behaviour of the Al2O3–C bottom nozzle in the casting process based on Finite Element Method (FEM). Results shown that the area near the core of the bottom nozzle was at a high temperature and under tensile stress conditions, whereas the edge area restricted by the external steel shell was mainly under compressive stress conditions. Then, the cracking tendency was evaluated, and an optimised bottom nozzle with a composite structure was proposed. The burning-free Al2O3–C bottom nozzle with a composite structure has an advantage in reducing the risks of cracking and extending the service life compared with the nozzle made of homogeneous materials. This work can make a significant contribution to the design of high performance bottom nozzles.

Experimental and simulation studies on the mechanical performance of concrete T-Girder bridge strengthened with K-Brace composite trusses

In this paper, a new transverse strengthening method was proposed for T-girder bridges with K-brace composite trusses. A series of experiments and simulations were conducted to study the strengthening effects under four different loading conditions, including non-eccentric loading, transverse eccentric loading, longitudinal eccentric loading, and bidirectional eccentric loading modes. Altogether four groups of specimens were fabricated and studied. Each group consisted of a control specimen and a strengthened one. Furthermore, the concrete plastic damage model was used to simulate the mechanical behaviors of the specimens. The results showed that such a strengthening method could significantly upgrade the mechanical behaviors of the T-girder bridge specimens, especially the local deformation and crack propagation manner of the T-girder. Compared with the control specimen, the deflection of concrete T-girder bridge specimen strengthened with the K-brace composite trusses was significantly decreased, with a maximum reduction of 38.6% under the prescribed load. Moreover, the K-brace composite trusses can markedly better the load distribution and improve the failure modes of the specimens, where the crack widths decreased even by 44.0%. They distributed along the beam more evenly. So, it provides a new method to strengthen and upgrade the mechanical properties of T-girder bridges.

Finite element analysis of steel-concrete composite connection with prefabricated permanent steel form

Composite structural members are widely used due to superior performance to traditional structural members consisting of either concrete or steel material. This study proposes steel-concrete composite beam-column connections utilizing prefabricated permanent steel form and presents a finite element analysis to ver-ify the structural performance of the system, which is based on the experimental data conducted under cyclic loading protocol simulating seismic action. Five different design specimens are covered where the key varia-bles include the asymmetric section of the steel beam, the type of the column, and the detail of longitudinal reinforcement placement. The specimens were modeled in ABAQUS with solid and truss elements for concrete and steel parts, respectively. In addition, the nonlinear material behavior of the concrete was considered in the model where the concrete damaged plasticity model was assigned. The interaction between concrete and steel was also investigated to capture the structural behavior of the specimens measured from the test. The analysis showed that the concrete section improves the structural performance of the composite beam while preventing the steel beam from bucking. The finite element analysis was not capable of catching the strength degradation at the ultimate state but provided reliable results with overall moment-story drift behavior.

STUDYING THE EFFECT OF PROJECTILE VELOCITY ON PENETRATION DEPTH IN CONCRETE WITH THE SIMPLIFIED CONCRETE DAMAGE PLASTICITY MODEL BY ABAQUS SOFTWARE

This paper calculates the penetration depth of 85 mm projectile in concrete block B20 by Abaqus software, with the concrete in simplified concrete damage plasticity (SCDP) model. Comparing the results calculated by Abaqus software with the Berezan formula and the improved Petry formula to check the reliability of the computational model and material model. From there, studying the effect of projectile velocity on penetration depth in concrete B20.

Finite element analysis of RC buildings subjected to blast loading

In this paper, the response of reinforced concrete buildings subjected to blast loading under variable mass of TNT and different statical system will be discussed. The study was carried out using the finite element program (ABAQUS) by using two different models (Flat slab system and Solid slab system). The plastic behavior of steel reinforced bars and concrete has been incorporated through Johnson-cook model and concrete damage plasticity model respectively. The results obtained from the two models are in terms of Von-Mises stresses, deflection and concrete damage against varying mass of TNT. The results indicate that using double reinforced mesh has great influence on reinforced concrete slabs to withstand blast loads and the damage in concrete happened under blast loads in flat slab system where in columns while the damage happened under blast loads in solid slab system where in beams so it is recommended to use the solid slab system.

Performance of (1) concrete-filled double-skin steel tube with and without core concrete, and (2) concrete-filled steel tubular axially loaded composite columns under close-in blast

Composite structural members such as concrete-filled double-skin steel tube (CFDSST) and concrete-filled double steel tubular (CFDST) columns are increasingly being utilized in modern structures owing to their capability to integrate the beneficial properties of constituent materials to carry heavy loads as compared to conventional reinforced concrete columns. Axial compression performance of such composite columns has been extensively investigated and available in the open literature. However, their response under impulsive loadings such as those induced by explosions is not very well studied because not many investigations have been conducted on these columns. Performance of composite compression members under short-duration/high-magnitude blast loading is of considerable interest under the prevailing environment of hi-tech wars, subversive activities, and accidental explosions. The recent devastating accidental Ammonium Nitrate explosion at Beirut port (Lebanon), and the ongoing invasion of Ukraine by Russia raise the concern of researchers and engineers for the safety of structural elements/components. In this study, a 3-D finite element model of axially loaded 2500 mm long CFDSST column of ultra-high-strength concrete (170 MPa) is developed in ABAQUS/Explicit-v.6.15 computer code equipped with Concrete Damage Plasticity (CDP) model, and investigation has been carried out for its blast performance under the 50kg-TNT explosive load at a standoff distance of 1.50 m in free-air. The effects of strain rate on the compressive strength of the concrete are considered as per fib Model Code 2010 (R2010) and UFC-3-340-02 (2008). The non-linear behavior of the steel is also taken into account. Damages in the form of (1) a - concrete crushing on the explosion side of the column and b - concrete cracking on the tension side and their spread over the column length, and (2) yielding of tubes are observed. Computational results are validated with the available experimental observations. To improve the column response, the analysis has been extended to investigate the blast performance of axially loaded CFDSST columns with and without core concrete having an inner steel tube of circular/square cross-section and their response have been compared with the equivalent single skin concrete-filled steel tubular circular/square columns of same axial load capacity.

Parametric Analyses of the Response of Masonry Walls with Reinforced Plaster

This paper presents the results of a parametric study on the response of unreinforced and retrofitted masonry specimens. The adopted strengthening technique is the steel-reinforced plaster, which is very commonly used but it is not supported by a proper theoretical and experimental characterization in the scientific literature. The aim was to investigate the main parameters that affect the structural performances of the walls. Several numerical models were implemented using the finite element method to analyze the influence of the bricks’ arrangements, the mechanical properties of the mortar joints, the number of connectors, and the mechanical properties and thickness of the plaster coating. A concrete damage plasticity model was adopted to describe the bricks, the mortar joints, and the plaster behaviors. For the unreinforced specimens, the outcomes confirmed that the mortar strength had a significant influence on the performance of the wall, together with the presence of potential weaknesses in the bricks, while the bond effect was negligible. For reinforced walls, the connectors do not have a significant influence on retrofitted wall capacity but may prevent instability if a proper number is considered. Furthermore, the strength of the plaster coating does not affect the collapse load significantly, while increasing the fracture energy, which can be produced, for instance, by using fiber-reinforced concrete, increases the capacity of retrofitted walls, with more limited damage. Finally, an increase in the plaster thickness may be beneficial in terms of collapse load, even though greater thickness may increase the seismic masses significantly.

Finite Element and Artificial Neural Network Modeling of FRP-RC Columns Under Axial Compression Loading

The use of fiber-reinforced polymer (FRP) bars to overcome the corrosion problems in various reinforced concrete structures is now well documented in the literature. As a result, the currently available design guidelines such as North American design codes allow for using the FRP bars as alternative materials to steel bars to be incorporated into the concrete structures. In practice, hollow-core concrete columns (HCCs) are widely accepted to make a lightweight structure and reduce its cost. Due to the lack of laboratory tests, engineers may not perform a safe design of HCCs with internal FRP bars. Therefore, the presented paper has endeavored to numerically and theoretically explore using the FRP bars and spirals as internal reinforcement for HCCs and investigate the effects of several test parameters. Using the current version of Finite Element Analysis (FEA) ABAQUS (3DS, 2014), a total of 116 HCCs were simulated based on 29 specimens experimentally tested by the researchers which acted as control specimens for the FE model. The complex structural response of concrete was reasonably determined using the concrete damaged plasticity model (CDPM) and the mechanical response of the FRP rebars are considered to behave linearly up to failure with no yielding stage. The calibrated FE model can provide an excellent portrayal of the HCCs’ response. Based on the database obtained from laboratory and simulation, several Artificial Neural Network (ANN) models were further provided to predict the confined compressive load of GFRP-RC HCCs at different loading stages.

Analytical Study of Geometric Parameter Effect on the Behavior of Horizontally Curved Reinforced Concrete Deep Beam

Nonlinear finite element simulation was once employed to look into the behavior of horizontally curved reinforced concrete deep beams under concentrated load at its mid-span. The study focused on the parametric impact of span length-to-depth (L/D) and span length-to-radius (L/R) ratios. In addition, the effect of longitudinal and spacing of shear reinforcement on the behavior of the beam has been investigated. The study considered sixteen beam specimens. Three of these specimens were straight beams as a control, and others were curved beams. The concrete-damaged plasticity model has been used to model the beam with C-25 grade concrete and steel reinforcements having diameters of ∅ 4 mm, ∅ 10 mm, and ∅ 12 mm with 568 MPa, 596 MPa, and 643 MPa steel grade, respectively. Reduced twenty-noded brick (C3D20 R) and two-noded (T3D2) elements have been used for modeling concrete and steel, respectively. The ultimate load capacity, the strain distribution, the load-deflection curve, and the load-twisting curve are the main outputs of the FE simulation. The study confirmed a considerable decrease in load-carrying capacity by up to 8.74% and 27.95% as the (L/R) ratio increased from 0 to 1.57 and the L/D ratio increased from 2.4 to 3, respectively. However, as the longitudinal steel ratio increased from 0.02042 to 0.02608 and the spacing of shear reinforcement decreased from 100 mm to 50 mm, the ultimate load capacity is increased up to 9.28% and 4.3%, respectively. Sensitivity evaluation was also conducted to see how much the independent variables (L/D ratio, L/R ratio, longitudinal bar ratio, and spacing transverse reinforcement) affect the dependent parameter (ultimate load capacity).

Failure evolution and fiber toughing mechanism of ultra-high performance concrete under uniaxial compression

The addition of steel fibers and coarse aggregates can greatly improve the toughness and compressive performance of ultra-high performance concrete (UHPC), however it will also introduce more interface transition zones (ITZ) with lower strength. This study reveals the evolution of compressive mechanical properties and the fiber toughening mechanism of UHPC. Combined with the concrete damaged plastic (CDP) model and the meso-random method, the 2D mesoscopic compression damage process of UHPC is simulated. The accuracy of the mesoscale numerical model and the feasibility of the research method are verified. The damage of ITZ occurs earlier than that of mortar and coarse aggregates under the compression load, and the development of damage ratio in ITZ is obviously different from those of coarse aggregates and mortar. The fiber stress changes significantly from compression state to tensile state, and the development of stress in a toughened functional fiber is related to its distribution angle.

Damage response of conventionally reinforced two-way spanning concrete slab under eccentric impacting drop weight loading

Reinforced concrete (RC) structures are generally designed to carry quasi-static gravity loads through almost indispensable components namely slab, however, it may be subjected to high intense loads induced from the impact of projectiles generated by the tornado, falling construction equipment, and also from accidental explosions during their construction and service lifespan. Impacts due to rock/boulder falls do occur on the structures located especially in hilly areas. Such loadings are not predictable but may cause severe damage to the slab/structure. It stimulates structural engineers and researchers to investigate and understand the dynamic response of RC structures under such impulsive loading. This research work first investigates the performance of 1000 × 1000 × 75 mm3 conventionally reinforced two-way spanning normal strength concrete slab with only tension reinforcement (0.88%) under the concentric impact load (1035 N) using the finite element method based computer code, ABAQUS/Explicit-v.6.15. The impact load is delivered to the centroid of the slab using a solid-steel cylindroconical impactor (drop weight) with a flat nose of diameter 40 mm, having a total mass of 105 kg released from a fixed height of 2500 mm. Two popular concrete constitutive models in ABAQUS namely; Holmquist-Johnson-Cook (HJC) and Concrete Damage Plasticity (CDP), with strain rate effects as per fib MODEL CODE 2010, are used to model the concrete material behavior to impact loading and to simulate the damage to the slab. The slab response using these two models is analyzed and compared with the impact test results. The strain rate effect on the reinforcing steel bars has been incorporated in the analysis using the Malvar and Crawford (1998) approach. A classical elastoplastic kinematic idealization is considered to model the steel impactor and support system. Results reveal that the HJC model gives a little overestimation of peak displacement, maximum acceleration, and damage of the slab while the predictions given by the CDP model are in reasonable agreement with the experimental test results/observations available in the open literature. Following the validation of the numerical model, analyses have been extended to further investigate the damage response of the slab under eccentric impact loadings. In addition to the concentric location (P1) of the impacting device, five locations on a quarter of the slab i.e., two along the diagonal (P2 & P3), the other two along the mid-span (P4 & P5), and the last one (P6) between P3 and P5, covering the entire slab, are considered. Computational results have been discussed and compared, and the evaluation of the most damaging location(s) of the impact is investigated. It has been found that the most critical location of the impact is not the centroid of the slab but the eccentric one with the eccentricity of 1/6th of the span from the centroid along the mid-span section.

Meso-Analysis of Recycled Coarse Aggregate Self-Compacting Concrete on the Basis of Random Aggregate Model

The purpose of this paper is to explore the numerical simulation of damage process and results of a new environmentally friendly material, recycled coarse aggregate self-compacting concrete (RCASCC). Random aggregate model of mesoscopic viewpoint was used for the experimental simulation of RCASCC. Results show that the specimens with 50% substitution rate exhibited the best performance among the specimens (i.e., with rates of 25%, 50%, 75%, and 100%). The stress-strain curves after dimensionless treatment were fitted using the uniaxial compressive principal equation of concrete with control parameters a = 0.9 and b = 11, and the fitting degree of the curve was relatively good. Meanwhile, the change process of internal cracking was shown intuitively. The crack expansion process became more obvious in the specimens and beams with a high substitution rate of RCA. The simulation results of the bending process of RCASCC beams analyzed by the concrete damaged plasticity (CDP) model and extended finite element (XFEM) were compared with the test results. Both simulation results validated the applicability of the CDP model and XFEM in the mechanical tests of RCASCC and can provide valuable reference for future research on the mechanical properties of recycled aggregate self-compacting concrete.

Using the Simplified Concrete Damage Plasticity Model in Studying the Penetration Depth in Concrete

This paper, with the simplified concrete damage plasticity (SCDP) model, studying the penetration depth of steel projectile in the concrete block by Abaqus software. Comparing the results calculated by Abaqus software with the Modified NDRC formula to check the reliability of the computational model and material model. From there, studying the effect of concrete strength on penetration depth in concrete B20, B30, B40, B50.

Modeling the contribution of tire-reclaimed and industrial steels fibers on the strength and ductility of RC-frames structures

PurposeThis paper aims to model the performances of frames structures by comparing the predictions of ordinary control concrete (CC) and concretes reinforced by fibers. Two types of steel fibers were used in this work, industrial steel fibers (ISF) and tire-reclaimed fibers obtained by cutting virgin steel tire-cord to 50 mm, noticed virgin steel fibers (VSF). In total, 3% of VSF are used. The results obtained in this paper clearly show the contribution of fibers in improving the global and local behavior of the frames structures. VSF gives the same or better overall behavior as the use of industrial fibers for the same percentage of fibers, with the advantage that VSF contributes to the protection of the environment and limit the wastage of steel.Design/methodology/approachThis work was carried out using the commercial finite element code Abaqus/Explicit. The behavior of the different concretes used in this study was modeled by the concrete damage plasticity (CDP) constitutive law. The methodology adopted to complete this work consisted in identifying, by calibration of the available experimental results with the numerical predictions, the parameters of the corresponding CDP model for each of the concretes used in this work. To this end, the authors have successively identified the CDP parameters for the CC-V (control concrete used by Vecchio and Emara, 1992) used in frame structure (R + 1). Subsequently, the CDP parameters of the CC-T (control concrete used by Tlemat, 2004), the CVSF (concrete with virgin steel fibers) and the CISF-1 (concrete with industrial steel fibers type 1, ISF-1) are identified using the experimental results of beams under bending tests. Once the model parameters were determined for each concrete, the authors conducted a series of simulations to show the benefit of introducing claimed and industrial fibers in frame structure (R + 1) and (R + 2). This approach recommends the use of concrete reinforced with steel fibers, mainly 6% by mass of VSF and ISF-1, in place of ordinary concrete in new construction to increase the resistance of structures and contribute, if applicable, to the protection of the environment.FindingsThe main findings of this study can be summarized by: the strength and ductility of the frames structures made of concrete fiber are significantly increased. The use of tire-reclaimed steel fibers (VSF) gives the same or better overall behavior as the use of industrial fibers. In addition to their good mechanical contribution, the tire-reclaimed fibers contribute to the protection of the environment and limit the wastage of steel. The use of fibers reduces the cracking zones in concrete fiber frames structures. The usefulness of distinguishing the interstory displacement limits set by codes, in particular, uniform building code (UBC-97), for ordinary concretes and concrete reinforced with fibers is addressed.Originality/valueThe contribution of tire-reclaimed and industrial fibers on the strength and ductility of reinforced concrete-frames structures is addressed. The use of tire-reclaimed steel fibers gives the same or better overall behavior as the use of industrial fibers, the tire-reclaimed fibers having the advantage of contributing to the protection of the environment and limiting the wastage of steel. The paper also points to the usefulness of distinguishing the interstory displacement limits set by codes, in particular UBC-97, for ordinary concrete and concrete reinforced with fibers, in accordance to the predictions of the capacity curves.

Mechanical properties and healing efficiency of 3D-printed ABS vascular based self-healing cementitious composite: Experiments and modelling

Cracking is one of the main causes for deterioration of concrete structures. Self-healing concrete with 3D-printed vascular networks has excellent potential for autonomous self-healing. This approach is scarcely investigated: no studies have been devoted to the influence of printing parameters on the properties of vascular based self-healing concrete. In this work, three-dimensional vascular structures with complex geometry were designed and printed with 4 different sets of printing parameters. First, the influence of the four, nominally identical, vascular networks on the initial flexural strength of self-healing concretes was experimentally investigated. In parallel, numerical modeling with a concrete damaged plasticity model (CDPM) in Abaqus software is used to simulate the influence of vascular networks on the mechanical properties of the self-healing composite. After the 4-point bending tests, epoxy resin is injected into the vascular networks as the healing agent to seal the cracks. Then, flexural strength regain and watertightness recovery were also measured. Based on the obtained results, we found that vascular based self-healing concretes have lower initial flexural strengths than the reference sample, as expected. The magnitude of the strength drop is shown to depend strongly on the printing parameters: the specimens with horizontally-printed vascular networks have higher flexural strength than the vertically-printed counterparts. Furthermore, vascular networks with a smaller printing layer-height have less influence on the initial flexural strength of vascular-based self-healing concrete compared to those with the larger printing layer-height. In terms of watertightness recovery, all tested vascular based self-healing samples showed a full (100%) recovery, which means that the printing direction and printing layer-height do not have an obvious effect on the watertightness recovery in this study. Numerical simulations of the mechanical performance of the composites with the CDPM show good agreement with the experiments, although printing quality of the vascular network influences the simulation accuracy. These simulations show great potential of using numerical simulations to design vascular based self-healing concrete in order to minimize a drop in mechanical properties, without compromising the healing efficiency. Overall, the designed 3D-printed vascular self-healing concretes show remarkable strength regain and watertightness recovery and provide a good basis for further research.

Numerical investigation and ANN-based prediction on compressive strength and size effect using the concrete mesoscale concretization model

The concrete mesoscale concretization model (CMCM) is proposed using the statistical distribution and local spatial correlation theory to describe the randomization, continuum, and correlation of the material properties of mesoscale components. The distribution of material properties was obtained by stochastic discretization, spatial correlation correction, and remapping operations. The hypotheses of elastic modulus control (EMC) and characteristic deformation control (CDC) are used to describe the variation of mechanical parameters in the concrete damage plasticity model. The uniaxial compression behavior and size effect of concrete with different side lengths, aspect ratios, aggregate contents, air contents, and contact frictions are simulated using the above model. Without the contact frictions, the size effect of the sample’s side length is apparent, while the size effect of aspect ratio is not observed. The increase of size effect degree is contributed by the increase of air content rather than aggregate content. When the loading boundaries are constrained by friction, both the side length and aspect ratio of samples show the size effect. The increase of aggregate content leads to the increase of size effect degree, while the increase of air content leads to a minor increase of size effect degree. The developed CMCM can capture the mechanical responses, and the ANN-based prediction model is applicable to explore the relationship between compressive strength and sample parameters.

Finite-element modelling of alkali–aggregate reaction in a concrete hydraulic structure

Alkali–aggregate reaction (AAR) in concrete has been found to cause serious concerns for the operation and integrity of many mass and reinforced concrete structures, hydraulic structures (dams, powerhouses, etc.) and any other concrete structure that is exposed to moisture. It is known that the kinetics of AAR is strongly driven by temperature and moisture, among other parameters, and the induced strain is assumed to be oriented according to the stress state. Due to complexity of the AAR and its multi-physical nature, the use of chemomechanical modelling is very helpful for making predictions in terms of displacements and concrete damage. Moreover, macro-modelling approaches are frequently preferred for engineering work in real structures. In this context, this paper presents the implementation of a chemomechanical model of AAR for concrete using Abaqus/Explicit modelling software. With this approach, the effects of AAR are introduced by way of the Vuexpan user subroutine jointly with the concrete damage plasticity model of Abaqus. Verification of the proposed model was carried out at the material level. Moreover, a case study of a real hydraulic structure affected by AAR located in North America is presented.

Investigation of Strengthening Reinforced Concrete Beam-Column Connection Wrapped with Fiber-reinforced Polymer

In reinforced concrete structures, the beam-column connection area has a considerable influence on the behavior of the structure. The use of fiber-reinforced polymer FRP to strengthen the connections in the Reinforced structure can be one of the solutions to transform this area, thus improving the behavior of the structure, which is achieved through the use of fiber-reinforced polymer of carbon to achieve high-strength concrete beam-column connections Investigations have been conducted using finite element modeling. The concrete damage plasticity model has been used to analyze the model. The results show that the bearing capacity has developed considerably, but the ductility is also significantly reduced. The study also evaluated the qualities of various reinforcement models and proposed the most effective reinforcement model. The use of fiber-reinforced polymer in the flex zone with fibers oriented at forty-five degrees in the shear zone of the joint showed the most significant changes in behavior. The demolition of reinforced concrete beam-column joints is a sudden failure without prior notice, since the collapse of the column and the connection before the break of the beam are undesirable, their occurrence can cause irreparable damage.

A coupled adhesive-frictional model tailored for interfacial behaviors between UHPC and NC materials

In this paper, a coupled adhesive-frictional is proposed and implemented within an implicit finite element (FE) solver, targeting interfacial behaviors between ultrahigh-performance concrete (UHPC) and normal concrete (NC) materials. The model couples the adhesive force and frictional force, which is consistent with the mainstream shear-friction theory. The proposed model is realized by the zero-thickness cohesive element, thorough user-defined element (UEL) subroutine provided by the general FE software Abaqus/Standard. The model satisfactorily predicts the bond strength between UHPC and NC materials subject to various statuses, i.e., the tensile force (direct-tensile test), and combined compressive and shear forces (slant shear test). In addition, the interfacial model works fully compatible with the concrete damaged plasticity model, which is adopted for the UHPC and NC materials. The combination of these two models yields agreed with simulation results, which effectively predicts various cracking propagation and failure patterns of UHPC-NC composite specimens. The specimens in literatures are selected for comparisons and the numerical simulations clearly illustrate the complex interactions between the matrix cracking and interfacial debonding.