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学者姓名：金浏
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Abstract ：
Scaling effects on the resistance response of RC components have been found under impact, penetration, and blast. To investigate the mechanism and origins of the scaling effect on the impact response of RC beams, numerical models of geometrically similar beams were established on the ABAQUS platform by considering the strain rate effect. The influence of material properties such as elasticity, plasticity, and strain rate effect on the similarity of beam impact response was accessed and analyzed. Then, the scaling effects of impact characteristics such as time history, damage, effective mass, and span length of RC beams were discussed and compared from the local and global stages. The numerical findings revealed that material properties influence the scaling effect on the impact response and strain rate distribution. The inhomogeneity of strain rate distribution and the difference in dynamic strength caused by the non-uniform scaling for the strain rate effects (DIFs) contribute to the scaling effect. In addition, the two-stage analysis results indicated that the scaling effects exhibited in the local and global responses of RC beams are not entirely consistent. As the scale factor increases, for the large-sized beams, the normalized deformation profile shrinks, the equivalent mass factor decreases, the effective span length changes slower, and the moving velocity of the plastic hinge slows down. Several impact performance characteristics, such as strain rate distribution within the beam and the damage and deformation curve of the beam, will reflect localization as the scale factor increases. It is expected that the preliminary mechanism analysis of this study could provide a reference for analyzing the impact response of prototype beams.
Keyword ：
Scaling effect Scaling effect Strain rate effect Strain rate effect RC beam RC beam Local response Local response Impact behavior Impact behavior
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| GB/T 7714 | Li, Jian , Zhang, Renbo , Jin, Liu et al. Mechanism analysis for scaling effect on the impact behaviors of RC beam: From material properties to component response [J]. | INTERNATIONAL JOURNAL OF IMPACT ENGINEERING , 2024 , 195 . |
| MLA | Li, Jian et al. "Mechanism analysis for scaling effect on the impact behaviors of RC beam: From material properties to component response" . | INTERNATIONAL JOURNAL OF IMPACT ENGINEERING 195 (2024) . |
| APA | Li, Jian , Zhang, Renbo , Jin, Liu , Lan, Dongqiu , Du, Xiuli . Mechanism analysis for scaling effect on the impact behaviors of RC beam: From material properties to component response . | INTERNATIONAL JOURNAL OF IMPACT ENGINEERING , 2024 , 195 . |
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Abstract ：
This study aims to investigate the tensile failure behaviours and corresponding fracture mechanisms of basalt fiber reinforced lightweight-aggregate concrete (BFLAC) at various temperatures via a comprehensive cryogenic tests and mesoscale simulations, with a special focus on the quantitative effects of cryogenic temperature and fiber volume fraction. Firstly, Macro- and micro-scale split-tensile tests of BFLAC with fiber volume fractions of 0.0-0.3 % at 20 similar to-90 degree celsius were conducted. Secondly, a two-steps sequentially thermo-mechanical coupled mesoscale analysis approach with explicit modelling of fibers and pore ice was developed to simulate the corresponding direct-tensile failures of BFLAC with more fiber volume fractions. The results show that as the temperature falls from 20 degree celsius to -90 degree celsius, the dominant action mechanism of basalt fibers changes from Mode-1 (pullout of fibers) to Mode-2 (rupture of fibers) due to the ice formation and the interactions between mesocomponents. Tensile strengths of BFLAC present a significant low-temperature enhancing effect, with a maximum increase of 90 % for direct-tensile strength while 104 % for split-tensile strength. Besides, as the temperature drops, although a larger proportion of fibers are in a low bridging stress state and a smaller proportion reach yield stress for rupture, the average fiber stress increases and the utilization degree of fibers with more stresses transferred improves, which results in that the fiber reinforcement effect is strengthened. Finally, based on experimental and numerical results, the quantitative relationships between split-tensile and directtensile strengths at different cryogenic temperatures were given. The present research results can better understand the cryogenic mechanical properties of BFLAC, which have important reference value for its extensive promotions and applications in engineering structures exposed to extreme low-temperature environments.
Keyword ：
Heat conduction Heat conduction Fiber reinforcement effect Fiber reinforcement effect Fiber volume fraction Fiber volume fraction Low temperature Low temperature Ice strengthening effect Ice strengthening effect
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| GB/T 7714 | Yu, Wenxuan , Xie, Chenxi , Jin, Liu et al. Mechanism analysis on tensile fracture properties of heterogeneous BFLAC at cryogenic temperature: Experimental investigation and mesoscale simulation [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 438 . |
| MLA | Yu, Wenxuan et al. "Mechanism analysis on tensile fracture properties of heterogeneous BFLAC at cryogenic temperature: Experimental investigation and mesoscale simulation" . | CONSTRUCTION AND BUILDING MATERIALS 438 (2024) . |
| APA | Yu, Wenxuan , Xie, Chenxi , Jin, Liu , Du, Xiuli , Wang, Jinting . Mechanism analysis on tensile fracture properties of heterogeneous BFLAC at cryogenic temperature: Experimental investigation and mesoscale simulation . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 438 . |
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Abstract ：
To investigate the effect of beam size on the combined mechanical performance of concrete beams reinforced with Basalt Fiber Reinforced Polymer bars (BFRP-RC beams), the simulation model of BFRP-RC beams under bending-shear-torsion loading was established with the aid of a mesoscale simulation method. The effects of beam size, stirrup ratio and torsion-bending on damage mechanisms of BFRP-RC beams, as well as the size effect law (SEL) were analyzed. Finally, a prediction formula that can characterize the impact of the torsion-bending ratio and stirrup ratio on BFRP-RC beams' SEL under combined loadings was proposed. Research shows (1) the BFRP-RC beams' damage mode changes from shear to torsion with the torsion-bending ratio improving, and there is a mutual weakening effect between shear and torsion. (2) BFRP-RC beams have noticeable size effects under combined loading. Moreover, the torsional and shear size effects are first enhanced and then weakened as the torsion-bending ratio increases. (3) The beams' torsional and shear strengths increase with increasing stirrup ratio, and the corresponding size effects diminish. (4) The SEL proposed in this study is accurate in predicting the shear and torsional capacity of beams under combined loading.
Keyword ：
Meso-scale numerical method Meso-scale numerical method Stirrup ratio Stirrup ratio Bending-shear-torsional composite loading Bending-shear-torsional composite loading Concrete beams with BFRP bars Concrete beams with BFRP bars Size effect Size effect
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| GB/T 7714 | Lei, Yushuang , Jin, Liu , Zhu, Huajie et al. Influence of structure size on bending-shear-torsion combined mechanical properties of concrete beams with BFRP bars [J]. | ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING , 2024 , 24 (4) . |
| MLA | Lei, Yushuang et al. "Influence of structure size on bending-shear-torsion combined mechanical properties of concrete beams with BFRP bars" . | ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING 24 . 4 (2024) . |
| APA | Lei, Yushuang , Jin, Liu , Zhu, Huajie , Du, Xiuli . Influence of structure size on bending-shear-torsion combined mechanical properties of concrete beams with BFRP bars . | ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING , 2024 , 24 (4) . |
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Abstract ：
To investigate the torsional performance of reinforced concrete (RC) columns strengthened with carbon fiber reinforced polymer (CFRP) sheets, a mechanical analysis model was established using a three-dimensional numerical method. The model considered the heterogeneity of concrete, and the interactions between steel bars/CFRP sheets and concrete, simultaneously. The validity of the numerical model was first verified. Subsequently, pure torsion was added on 40 CFRP sheet-strengthened RC columns to investigate the influences of the fiber ratio, the structure size, and the cross-section shape on their torsional performance. Results showed that (1) size effect can be observed in the nominal torsional strength of both square and circular CFRP sheet-strengthened RC columns; (2) the size effect of square columns was stronger than circular columns due to weaker confinement effects of CFRP sheets on the square columns; (3) the addition of CFRP sheets can simultaneously improve the torsional strength and weaken the size effect, which is beneficial to the torsional performance of the column. Moreover, a torsional size effect law was proposed to predict the torsional strength of CFRP sheet-strengthened RC columns based on current simulation results.
Keyword ：
CFRP sheet CFRP sheet Size effect Size effect Meso-scale simulation Meso-scale simulation Shape effect Shape effect Torsional failure Torsional failure RC column RC column
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| GB/T 7714 | Jin, Liu , Ji, Yiding , Li, Dong et al. Size- and shape-effects analysis on the pure torsional performance of CFRP sheet-strengthened RC columns [J]. | ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING , 2024 , 24 (4) . |
| MLA | Jin, Liu et al. "Size- and shape-effects analysis on the pure torsional performance of CFRP sheet-strengthened RC columns" . | ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING 24 . 4 (2024) . |
| APA | Jin, Liu , Ji, Yiding , Li, Dong , Lei, Yushuang , Du, Xiuli . Size- and shape-effects analysis on the pure torsional performance of CFRP sheet-strengthened RC columns . | ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING , 2024 , 24 (4) . |
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Abstract ：
To reveal the influence of the initial static shear on the torsional performance of Basalt Fiber Reinforced Polymer Bars-Reinforced Concrete (BFRP bars-RC) beams, in this study, 52 BFRP barsRC beam models with geometric similarity using a three-dimensional mesoscale numerical simulation method were established. The effects of initial shear static loadings (F0 = 0, 0.25Vu, 0.5Vu, and 0.75Vu) on the failure modes, torsional strength, ductility, and size effect of BFRP barsRC beams under various equivalent strain rates were quantitatively analyzed. The results show that, regardless of whether the beams have initial damage, their load-bearing capacity and deformation ability increase as loading strain rates increase. For beams with initial damage, the increased degrees in load-bearing capacity relative to their respective initial static shear decreases as the initial static shear level increases but then increases as the subsequent loading strain rate increases. Increasing the beams' initial damage degree makes the beams' ductility worse. In addition, the more severe the beams' initial damage, the more significant the strength size effect. However, increasing the strain rate can weaken the beams' strength size effect.
Keyword ：
Size effect Size effect Torsional loading Torsional loading BFRP bars-RC beams BFRP bars-RC beams Mesoscale simulation Mesoscale simulation Initial damage Initial damage Loading strain rate Loading strain rate
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| GB/T 7714 | Lei, Yushuang , Jin, Liu , Du, Xiuli . The influence of initial static shear on the torsional performance of BFRP bars-RC beams with different sizes [J]. | ENGINEERING FAILURE ANALYSIS , 2024 , 165 . |
| MLA | Lei, Yushuang et al. "The influence of initial static shear on the torsional performance of BFRP bars-RC beams with different sizes" . | ENGINEERING FAILURE ANALYSIS 165 (2024) . |
| APA | Lei, Yushuang , Jin, Liu , Du, Xiuli . The influence of initial static shear on the torsional performance of BFRP bars-RC beams with different sizes . | ENGINEERING FAILURE ANALYSIS , 2024 , 165 . |
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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 et al. "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 ：
Hybrid steel-BFRP reinforced concrete (HRC) beams have demonstrated their ability to meet the rigorous demands for both strength and serviceability. However, the mechanical properties of HRC beams under fire accompanied by impact loadings are not yet clear. In order to delve into the impact resistance of HRC beams under high temperatures, a three-dimensional numerical model was crafted to account for both the effects of strain rate and temperature degradation. The study aimed to examine how the impact resistance of HRC beams is influenced by varying area ratios and arrangements of BFRP bars. The model's reliability was ascertained through a comparison between its simulation outcomes and the results of physical tests. The results show that HRC beams exhibit a significant reduction in stiffness, impact and internal force under fire conditions (39 %, 38 % and 72 % for a fire duration of 45 min, respectively). Furthermore, the damage is concentrated in the midspan. The impact performance of HRC beams at room and high temperatures is between those of pure steelRC beams and pure-BFRP beams. The variations under the same fire conditions in the displacement and internal force of beams with different BFRP bars area ratios reach 70 %, while with different arrangements of BFRP bars do not differ much (within 20 %). The dynamic to static stiffness ratio and ultimate load ratio is reduced following the growth of BFRP bars area ratio (max. gap up to 56 % and 25 %) and fire time (max. gap up to 15 % and 20 %). Therefore, specimen design prioritizes the bar arrangement with better corrosion resistance. Additionally, the residual bearing capacity of HRC beams is only 10-40 % of the original under 45 min fire duration. The association of residual load capacity and displacement with fire time shifted from linear to nonlinear with rising temperature.
Keyword ：
Hybrid steel-BFRP bars Hybrid steel-BFRP bars Numerical simulation Numerical simulation Under high temperature Under high temperature RC beam RC beam Damage assessment Damage assessment Impact performance Impact performance
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| GB/T 7714 | Zhang, Renbo , Zheng, Min , Jin, Liu et al. Impact performance of fire-damaged hybrid steel-BFRP reinforcement concrete beams: Influence of area ratio and arrangement of BFRP bars [J]. | ENGINEERING STRUCTURES , 2023 , 293 . |
| MLA | Zhang, Renbo et al. "Impact performance of fire-damaged hybrid steel-BFRP reinforcement concrete beams: Influence of area ratio and arrangement of BFRP bars" . | ENGINEERING STRUCTURES 293 (2023) . |
| APA | Zhang, Renbo , Zheng, Min , Jin, Liu , Du, Xiuli . Impact performance of fire-damaged hybrid steel-BFRP reinforcement concrete beams: Influence of area ratio and arrangement of BFRP bars . | ENGINEERING STRUCTURES , 2023 , 293 . |
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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 ：
Fiber-reinforced-polymer (FRP) reinforced concrete structures are gradually applied in building, bridge, dam engineering, etc. Compared with the extensively-studied static mechanical properties, the research on the impact resistance of FRP-reinforced concrete beams is minimal. This study established and validated the 3D modeling approach of Basalt FRP (BFRP) reinforced concrete beams with different stirrup ratios. Numerical simulations were performed under different impact energy. The effects of the stirrup ratio and impact energy on the me-chanical response of concrete beams were presented and analyzed. It can be concluded that the increasing stirrup ratio can restrict the development of bending-shear cracks and thus preclude shear plug failure. Under the given impact energy, as the stirrup ratio increases, the midspan peak and residual displacement are reduced. More stirrups are activated while stirrup peak strains decrease in the shear region. The increasing stirrup ratio en-hances the integrity and overall rigidity of the beams, which is more effective at higher velocities. Moreover, a nominal equal-damage analysis on the beams was performed according to energy dissipation, which provides a reference for in-depth research and design. Finally, considering the relationship between the static load-carrying capacity and dynamic input energy of the beam, a semi-empirical simplified method for predicting the peak impact deflection of concrete beams was suggested and initially verified. The simplified prediction method provides new insights for impact mechanical response investigation and engineering structure design for BFRP-reinforced concrete beams.
Keyword ：
Simplified method Simplified method Stirrup ratio Stirrup ratio Impact energy Impact energy Impact response Impact response Basalt FRP concrete beam Basalt FRP concrete beam
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| GB/T 7714 | Li, Jian , Zhang, Renbo , Jin, Liu et al. Effect of stirrup ratio on impact response of BFRP-reinforced concrete beams under different energy levels [J]. | INTERNATIONAL JOURNAL OF IMPACT ENGINEERING , 2023 , 173 . |
| MLA | Li, Jian et al. "Effect of stirrup ratio on impact response of BFRP-reinforced concrete beams under different energy levels" . | INTERNATIONAL JOURNAL OF IMPACT ENGINEERING 173 (2023) . |
| APA | Li, Jian , Zhang, Renbo , Jin, Liu , Lan, Dongqiu , Zheng, Min , Du, Xiuli . Effect of stirrup ratio on impact response of BFRP-reinforced concrete beams under different energy levels . | INTERNATIONAL JOURNAL OF IMPACT ENGINEERING , 2023 , 173 . |
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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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