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学者姓名:金浏
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Abstract :
Studies on the biaxial strength criterion provide a significant theoretical basis for the exploration of concrete material's biaxial and multiaxial mechanical properties. In this study, mesoscopic modeling of concrete cube specimens with an average compressive strength of 30 MPa was established. Numerical experiments were performed under dynamic biaxial conditions with different strain rates (research scope: 10(-5) s(-1)-1 s(-1)) and lateral stress ratios (research scope: 0-1 in biaxial compression loads and -1-0 in biaxial tension-compression loads). The effects of strain rate and lateral stress ratio on the dynamic biaxial strength of concrete were studied. Based on multi-parameter analysis, a universal static-dynamic biaxial strength criterion of concrete material was established. The proposed strength criterion breaks through the limitations of traditional physical test conditions and provides a higher application range for strain rate (10(-5) s(-1)-1 s(-1)) and lateral stress ratio. In addition, the proposed criterion has a more concise expression, which is more convenient for engineering applications. Moreover, the influence of various parameters on concrete strength was considered and coupled. Finally, the accuracy and applicability of the established strength criterion were verified by comparing the predicted dynamic biaxial compressive strengths under different loading conditions with four sets of experimental results. The comparisons indicate that the predicted strength criterion surface agrees with test results for a wide range of loading conditions from biaxial compression to biaxial tension-compression. The dynamic strength criterion provides new insights for concrete mechanical investigation and engineering structure designing. (C) 2022 American Society of Civil Engineers.
Keyword :
Concrete material Concrete material Strength criterion Strength criterion Dynamic biaxial loading Dynamic biaxial loading Strain rate Strain rate Lateral stress ratio Lateral stress ratio
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GB/T 7714 | Li, Jian , Jin, Liu , Du, Xiuli . Static-Dynamic Universal Strength Criterion for Concrete Material [J]. | JOURNAL OF ENGINEERING MECHANICS , 2023 , 149 (1) . |
MLA | Li, Jian 等. "Static-Dynamic Universal Strength Criterion for Concrete Material" . | JOURNAL OF ENGINEERING MECHANICS 149 . 1 (2023) . |
APA | Li, Jian , Jin, Liu , Du, Xiuli . Static-Dynamic Universal Strength Criterion for Concrete Material . | JOURNAL OF ENGINEERING MECHANICS , 2023 , 149 (1) . |
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Abstract :
There have been few studies regarding the torsional behavior of FRP-reinforced concrete members. Only the CSA S806-12 and the ACI 440.11-22 codes specify the design criteria for their pure torsional capacities. A meso-scale numerical model of circular/square concrete columns with BFRP bars was developed, in which concrete heterogeneity can be explicitly described. This study evaluated longitudinal reinforcement ratios, stirrup ratios, cross-section shape, and structural size for their effects on BFRP-reinforced concrete column torsional performance. For BFRP-reinforced concrete columns, the nominal torsional strength exhibits a significant size effect, while the longitudinal reinforcement and stirrups ratio cannot suppress the size effect. Furthermore, a modified size effect law was developed to quantitatively reflect the relationship between nominal torsional strength and structural size. BFRP-reinforced concrete columns present a more substantial size effect than steel-reinforced ones. Finally, a modified calculation formula of pure torsional capacity was proposed considering the effect of structural size.
Keyword :
Meso-scale simulation Meso-scale simulation Modified calculation formula Modified calculation formula Pure torsional failure Pure torsional failure Torsional strength Torsional strength Size effect Size effect BFRP reinforced concrete columns BFRP reinforced concrete columns
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GB/T 7714 | Jin, Liu , Zhu, Huajie , Lei, Yushuang et al. Mesoscale modeling of size effect of BFRP-reinforced concrete columns under pure torsion [J]. | ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING , 2023 , 24 (1) . |
MLA | Jin, Liu et al. "Mesoscale modeling of size effect of BFRP-reinforced concrete columns under pure torsion" . | ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING 24 . 1 (2023) . |
APA | Jin, Liu , Zhu, Huajie , Lei, Yushuang , Du, Xiuli . Mesoscale modeling of size effect of BFRP-reinforced concrete columns under pure torsion . | ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING , 2023 , 24 (1) . |
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Abstract :
Due to the remarkable influence of aggregate characteristics on the mechanical behaviors of concrete materials, and in particular the microcracking development, complex aggregates shapes instead of widely used spherical -shape need to be considered in advanced numerical approaches. Apart from that, in numerical simulations, an extra consideration of the influences of concrete's heterogeneity on its softening behaviors is strongly recommended by the scientific community. In this context, the softening behaviors of concrete materials undergoing heterogeneous expansion in the aggregates due to fast neutron radiation were investigated in the present paper, and the influences of both aggregate shape and the heterogeneity of aggregate expansion were considered. According to the real shapes of aggregates, polygon-shaped aggregates with random orientation were placed into a 3D numerical concrete specimen, and a two-stage finite element (FE) approach allowing a coupled thermal-mechanical analysis was proposed. In the first stage, the temperature field evolves in time and the 3D concrete specimen was estimated. In the second stage, the temperature-and neutron fluence-dependent heterogeneous expansion in the aggregates was calculated and introduced into the 3D mesoscopic model, and the development of microcracks in the concrete, the resulting mechanical responses, the loss in mechanical properties of the radiation-induced concrete was evaluated. Surmounting the limitations due to the spherical-shape of aggregate and the homogeneous assumption of the aggregate expansion in the concrete, the present paper developed a new methodology in which the combined effects of aggregate's shape and the heterogeneous distribution of aggregate expansion on the mechanical properties of radiation-induced concrete were considered, permitting evaluating the changes in the dimensional and mechanical properties of radiation -induced concrete. The proposed model provides a reference to assess the long-term durability and the structural integrity of nuclear power plants.
Keyword :
Residual mechanical properties Residual mechanical properties Concrete material Concrete material 3D mesoscale numerical model 3D mesoscale numerical model Fast neutron Fast neutron Radiation-induced volumetric expansion Radiation-induced volumetric expansion
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GB/T 7714 | Chen, F. , Gao, C. , Jin, L. et al. Numerical investigations on the viscoelastic-damage behaviors of RIVE-induced concrete [J]. | INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES , 2023 , 239 . |
MLA | Chen, F. et al. "Numerical investigations on the viscoelastic-damage behaviors of RIVE-induced concrete" . | INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES 239 (2023) . |
APA | Chen, F. , Gao, C. , Jin, L. , Du, X. , Bary, B. , Le Pape, Y. et al. Numerical investigations on the viscoelastic-damage behaviors of RIVE-induced concrete . | INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES , 2023 , 239 . |
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Abstract :
The mechanical properties of concrete-filled steel tubular (CFST) columns with different sizes under torsional load were studied, aiming to further explore the pure torsional failure mechanism and size effect behavior of CFST columns. First, a 3D meso-scale numerical model of CFST is established and compared with the existing experimental data. Second, the torsional failure mechanism of CFST column under different section sizes, constraints (confinement coefficient), and cross-sectional shapes is considered. Results show that: (1) the nominal torsional strength of CFST columns presents a size effect, and the columns with square cross-section present stronger size effect than the ones with circular shape; (2) with the increase of the confinement coefficient, the size effect of the nominal torsion strength is weakened. Finally, considering the quantitative influence of the size effect, a formula for calculating the pure torsional capacity of CFST columns was developed.
Keyword :
meso-scale simulation meso-scale simulation CFST columns CFST columns size effect size effect confinement coefficient confinement coefficient pure torsional failure pure torsional failure
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GB/T 7714 | Jin, Liu , Wang, Zhongshiyu , Zhu, Huajie et al. Meso-scale modeling of size effect on pure torsional failure of concrete-filled steel tubular columns [J]. | STRUCTURAL CONCRETE , 2023 , 24 (2) : 3039-3054 . |
MLA | Jin, Liu et al. "Meso-scale modeling of size effect on pure torsional failure of concrete-filled steel tubular columns" . | STRUCTURAL CONCRETE 24 . 2 (2023) : 3039-3054 . |
APA | Jin, Liu , Wang, Zhongshiyu , Zhu, Huajie , Li, Dong , Du, Xiuli . Meso-scale modeling of size effect on pure torsional failure of concrete-filled steel tubular columns . | STRUCTURAL CONCRETE , 2023 , 24 (2) , 3039-3054 . |
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Abstract :
To investigate the size effect on compressive performance of circular concrete columns reinforced with basalt fiber-reinforced polymer (BFRP) bars and spirals, nine geometrically similar columns were fabricated and tested under concentric compression. The variables tested were cross-sectional diameters (200, 400, and 600 mm) and transverse reinforcement ratios (1.2%, 2.2%, and 3.3%). The results evidently indicated the size effect on the confined strength, corresponding strain and deterioration rate (in the post-peak branch) of concrete core confined by BFRP spirals. Specifically, with the cross-sectional diameter changing from 200 mm to 600 mm, the maximum decreases in the confined strength and corresponding strain were 14.1% and 31.9%, respectively, while the maximum increase in the deterioration rate was 318%. In addition, the size effect on confined strength could be weakened with the increase of transverse reinforcement ratio. Increasing the transverse reinforcement ratio could enhance the load-carrying capacity as well as effectively increase the confinement strength and ductility. Finally, a size-dependent stress-strain model, which considers the size effect of confined strength, corresponding strain and deterioration rate, was developed for evaluating the confined behavior of FRP RC columns.
Keyword :
BFRP bar BFRP bar Size effect Size effect Size-dependent model Size-dependent model Analytical modeling Analytical modeling BFRP spirals BFRP spirals Confined concrete Confined concrete
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GB/T 7714 | Li, Ping , Jin, Liu , Liang, Jian et al. Size effect on the compressive behavior of BFRP RC circular columns: Experiments and a size-dependent stress-strain model [J]. | COMPOSITE STRUCTURES , 2023 , 321 . |
MLA | Li, Ping et al. "Size effect on the compressive behavior of BFRP RC circular columns: Experiments and a size-dependent stress-strain model" . | COMPOSITE STRUCTURES 321 (2023) . |
APA | Li, Ping , Jin, Liu , Liang, Jian , Fan, Lingling , Du, Xiuli . Size effect on the compressive behavior of BFRP RC circular columns: Experiments and a size-dependent stress-strain model . | COMPOSITE STRUCTURES , 2023 , 321 . |
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Abstract :
A 3D model is established to simulate the bond performance of corroded RC beams, in which the non-uniform corrosion of tensile reinforcement and confinement conditions (characterized by the thickness-diameter ratios of 1.9-3.8 and stirrup confinement index of 0-8.3%) are investigated. In the 3D numerical model, fine modeling was adopted to consider the influences of corrosion on the steel-concrete interface and the non-uniform corrosion was considered by separating the tensile bars into two parts with inconsistent diameter loss. Meanwhile, a two-stage numerical analysis method was utilized, to reflect the corrosion-induced concrete cracking by applying forced displacement and subsequently analyzed their flexural bond performance. In comparison to the existing experiments, the proposed 3D numerical model is proved to be reasonable. In addition, the simulation results show that the increment of the (residual) bond strength generated by the increasing thickness-diameter ratio increases with the mass loss rate, while the increases of stirrup confinement index cause much more increases in the (residual) bond strength for the corroded RC beams than the un-corroded beams. Furthermore, a bond stress-slip relationship is proposed taking the non-uniform corrosion and confinement conditions into account, which correlates well with the experiments.
Keyword :
Numerical simulation Numerical simulation RC beam RC beam Confinement condition Confinement condition Non-uniform corrosion Non-uniform corrosion Bond performance Bond performance
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GB/T 7714 | Wu, Jieqiong , Zhang, Xiaowang , Jin, Liu et al. Numerical study on the effects of non-uniform corrosion and confinement conditions on the bond performance of RC beams [J]. | CASE STUDIES IN CONSTRUCTION MATERIALS , 2023 , 19 . |
MLA | Wu, Jieqiong et al. "Numerical study on the effects of non-uniform corrosion and confinement conditions on the bond performance of RC beams" . | CASE STUDIES IN CONSTRUCTION MATERIALS 19 (2023) . |
APA | Wu, Jieqiong , Zhang, Xiaowang , Jin, Liu , Du, Xiuli . Numerical study on the effects of non-uniform corrosion and confinement conditions on the bond performance of RC beams . | CASE STUDIES IN CONSTRUCTION MATERIALS , 2023 , 19 . |
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Abstract :
Taking into consideration the concrete heterogeneity, a three-dimensional meso-scale approach was established to model the failure of axially loaded rectangular reinforced concrete (RC) columns confined with carbon FRP (CFRP). This meso-scale method was first verified by the available test data. The investigation on the influences of edge sharpness from 0.07 to 0.20 and aspect ratios of 1.0, 1.5 and 2.0 on compressive behavior of CFRP-confined rectangular RC columns with different cross-sectional heights (300 mm, 600 mm, and 900 mm) was performed using the verified numerical model. Similar failure model was observed from the geometrically-similar columns, while a significant size effect was exhibited in the compressive strength. As the structural size increased, the effective confinement area ratio calculated from axial stress distribution decreased, illustrating that the confinement of CFRP jackets on concrete existed a size effect. Moreover, as the edge sharpness increased, the size effect on confinement was weakened, and this weakening effect was reduced with the aspect ratio increasing. Finally, considering the influence of the new arch action model and structural size, a modified model was proposed to predict compressive strengths of rectangular RC columns strengthened with CFRP.
Keyword :
Aspect ratio Aspect ratio Edge sharpness Edge sharpness CFRP-confined rectangular RC columns CFRP-confined rectangular RC columns Size effect Size effect Arch action Arch action Meso-scale modelling Meso-scale modelling
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GB/T 7714 | Fan, Lingling , Jin, Liu , Du, Xiuli . Modeling of size effect on compressive behavior of CFRP-confined rectangular RC columns: Influence of corner radius and aspect ratio [J]. | COMPOSITE STRUCTURES , 2023 , 304 . |
MLA | Fan, Lingling et al. "Modeling of size effect on compressive behavior of CFRP-confined rectangular RC columns: Influence of corner radius and aspect ratio" . | COMPOSITE STRUCTURES 304 (2023) . |
APA | Fan, Lingling , Jin, Liu , Du, Xiuli . Modeling of size effect on compressive behavior of CFRP-confined rectangular RC columns: Influence of corner radius and aspect ratio . | COMPOSITE STRUCTURES , 2023 , 304 . |
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Abstract :
This paper presents experimental and meso-scale modelling studies on the combined effects of strain-rate and specimen size on uniaxial compressive failure behaviour of concrete. A series of uniaxial compressive tests and meso-scale simulations were conducted on concrete with various specimen sizes under different strain-rates covering the strain-rate range of seismic load, with special focus on the quantitative contribution of end-friction to compressive strength and its corresponding strain-rate effect as well as size effect. Results indicate that the uniaxial compressive failure with end-friction follows an hourglass failure pattern while that without end-friction exhibits a columnar failure pattern. The end-friction effect can form different confined zone distributions for various sized specimens, which can cause the contribution of end-friction to compressive strength is size dependent as well as enhance the influence of specimen size on static and dynamic strength. The contribution proportion of end-friction to compressive strength is around 20 similar to 25%. Moreover, larger-sized specimen performs a stronger strain-rate effect and the increasing strain-rate can weaken the influence of specimen size on the real compressive strength. The proposed real DIF empirical formula considering the size-dependency (covering the low strain-rate range) can well estimate the strain-rate effect for concrete with different sizes, which can provide a valuable reference for the numerical calculation of dynamic mechanical response and the safety design of concrete structures.
Keyword :
dynamic increase factor dynamic increase factor size effect size effect lateral restraint lateral restraint real strength real strength meso-scale simulation meso-scale simulation Uniaxial compressive test Uniaxial compressive test
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GB/T 7714 | Yu, Wenxuan , Jin, Liu , Du, Xiuli . Experiment and meso-scale modelling on combined effects of strain rate and specimen size on uniaxial-compressive failures of concrete [J]. | INTERNATIONAL JOURNAL OF DAMAGE MECHANICS , 2023 , 32 (5) : 683-714 . |
MLA | Yu, Wenxuan et al. "Experiment and meso-scale modelling on combined effects of strain rate and specimen size on uniaxial-compressive failures of concrete" . | INTERNATIONAL JOURNAL OF DAMAGE MECHANICS 32 . 5 (2023) : 683-714 . |
APA | Yu, Wenxuan , Jin, Liu , Du, Xiuli . Experiment and meso-scale modelling on combined effects of strain rate and specimen size on uniaxial-compressive failures of concrete . | INTERNATIONAL JOURNAL OF DAMAGE MECHANICS , 2023 , 32 (5) , 683-714 . |
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Abstract :
The strengthening and retrofitting technique with fiber-reinforced polymer (FRP) composites on reinforced concrete (RC) columns has been widely popular. Compared with concentric compression behaviors of rectangular FRP-confined concrete columns, there are only limited investigations on their eccentric behaviors. Additionally, the applicability of existing design codes obtained from tested small-size columns in calculating load capacity of large-size columns has not been reasonably explained. In view of this, this paper developed a mesoscale numerical analysis method using a random aggregate model based on consideration of concrete heterogeneity. A series of rectangular carbon FRP (CFRP)-confined RC columns having different cross-sectional heights were modelled to investigate the influences of corner radius and size effect on their eccentric compression behaviors. Simulated results showed that there was a transformation of failure mode from brittle compression failure to ductile tensile failure with the increasing load eccentricity. An identical globally failure mode for rectangular columns having different cross-sectional heights was observed whereas crack widths became larger obviously with the increasing cross-sectional height. Regarding the axial load versus mid-height deflection relationship, the corner radius had a significant influence on maximum axial load and softening stage, especially at smaller load eccentricities. One can see that from nominal interaction diagrams, small-eccentrically-loaded columns exhibited more obvious size effect than large-eccentrically-loaded columns. The safety factor of load capacity decreased with the increasing cross-sectional height compared with existing design codes of ACI 440.2R-17 and GB 50608, illustrating that design codes appear to be not conservative for large-size specimens. Taking the influence of size effect into account, the design equations suggested by ACI 440.2R-17 were modified in this study, and the rationality of this correction methodology was verified against simulated data and results of tested large-size rectangular columns.
Keyword :
Corner radius Corner radius Meso-scale numerical analysis Meso-scale numerical analysis Rectangular column Rectangular column Fiber-reinforced polymer (FRP) Fiber-reinforced polymer (FRP) Size effect Size effect Interaction diagram Interaction diagram
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GB/T 7714 | Fan, Lingling , Jin, Liu , Du, Xiuli . Effects of structural size and corner radius on eccentric failure of rectangular CFRP-wrapped RC columns: Meso-scale modellings [J]. | ENGINEERING STRUCTURES , 2023 , 283 . |
MLA | Fan, Lingling et al. "Effects of structural size and corner radius on eccentric failure of rectangular CFRP-wrapped RC columns: Meso-scale modellings" . | ENGINEERING STRUCTURES 283 (2023) . |
APA | Fan, Lingling , Jin, Liu , Du, Xiuli . Effects of structural size and corner radius on eccentric failure of rectangular CFRP-wrapped RC columns: Meso-scale modellings . | ENGINEERING STRUCTURES , 2023 , 283 . |
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Abstract :
Ultra High Performance Concrete (UHPC) has gradually become the most promising high-performance material, and has achieved good results in the field of impact and explosion protection engineering. In general, normal reinforced concrete (NC) beams subjected to impact load are prone to local punching shear failure. Although pure UHPC beams can improve their impact performance, their further application is limited by the high cost. In order to achieve the balance between impact resistance and economy, this study puts forward the design scheme of local replacement and wrapping with UHPC to improve the impact resistance of reinforced concrete beams. In this work, the different research conditions including NC beam, UHPC beam and NC-UHPC composite beam are designed, and the impact resistance of specimens is compared and analyzed. The results show that UHPC local replacement scheme can effectively avoid local punching shear failure of beams. As for the UHPC wrapping scheme, the failure mode of the beam changes from punching shear failure to bending failure. Compared with NC beams, two schemes can effectively reduce the peak displacement and residual displacement in the mid-span. The peak displacement and residual displacement in the mid-span of the UHPC local replacement beam are smaller than that of UHPC wrapping schemes, and the mid-span bearing capacity is better. In this work, it is recommended to take a local replacement length greater than 2 times the beam height to avoid local punching shear failure.
Keyword :
impact loads impact loads NC beam NC beam composite beam composite beam ultra high performance concrete ultra high performance concrete punching shear punching shear bending failure bending failure
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GB/T 7714 | Wu, Min , Pei, Bida , Zeng, Youyi et al. Performance analysis of the ultra high performance concrete composite beam subjected to impact loads [J]. | ADVANCES IN STRUCTURAL ENGINEERING , 2023 , 26 (8) : 1498-1511 . |
MLA | Wu, Min et al. "Performance analysis of the ultra high performance concrete composite beam subjected to impact loads" . | ADVANCES IN STRUCTURAL ENGINEERING 26 . 8 (2023) : 1498-1511 . |
APA | Wu, Min , Pei, Bida , Zeng, Youyi , Liu, Jin , Du, Xiuli . Performance analysis of the ultra high performance concrete composite beam subjected to impact loads . | ADVANCES IN STRUCTURAL ENGINEERING , 2023 , 26 (8) , 1498-1511 . |
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