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摘要 ：
The axial compression performance of confined reinforced concrete columns in cryogenic temperature environments is affected by the mechanical properties of reinforcement and concrete materials. The properties of reinforcement and concrete material vary greatly in cryogenic environments. To investigate the axial compression behavior of confined reinforced concrete columns at cryogenic temperatures, specimens with stirrup-confined and carbon fiber-reinforced polymer (CFRP) confined were simulated respectively, considering the impact of cryogenic temperatures on material properties. The various stirrup and CFRP ratios were applied at different temperatures from 20 degrees C to -120 degrees C. The results indicate that decreasing temperature improves the peak load and initial stiffness while reducing peak strain and ductility. The ductility of specimens improves with the increasing stirrup and CFRP ratios, while the increment at cryogenic temperatures is less than that at 20 degrees C. At -120 degrees C, the hoop strains at the peak point and descending branch are greater than those at 20 degrees C. The confined strength increases linearly with the increasing confinement ratio, while the decreasing temperature reduces the growth rate. The confinement effects are weakened as temperature drops. Based on the numerical results, a compression model that can reflect the influence of cryogenic temperatures was established. The model can provide better predictions of confined strength, peak strain, and stress-strain curves of confined reinforced concrete columns under axial compressive load and cryogenic temperatures.
关键词 ：
Prediction formula Prediction formula Cryogenic temperatures Cryogenic temperatures Confined column Confined column Compression behavior Compression behavior
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| GB/T 7714 | Jin, Liu , Liu, Kaixin , Zhang, Renbo et al. Prediction of Axial Compression Behavior of Confined Concrete Columns Considering the Effect of Cryogenic Temperatures [J]. | JOURNAL OF COLD REGIONS ENGINEERING , 2024 , 38 (2) . |
| MLA | Jin, Liu et al. "Prediction of Axial Compression Behavior of Confined Concrete Columns Considering the Effect of Cryogenic Temperatures" . | JOURNAL OF COLD REGIONS ENGINEERING 38 . 2 (2024) . |
| APA | Jin, Liu , Liu, Kaixin , Zhang, Renbo , Yu, Wenxuan , Du, Xiuli . Prediction of Axial Compression Behavior of Confined Concrete Columns Considering the Effect of Cryogenic Temperatures . | JOURNAL OF COLD REGIONS ENGINEERING , 2024 , 38 (2) . |
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摘要 ：
CFRP (Carbon Fiber Reinforced Plastics) debonding jeopardizes structural reinforcement in engineering projects. Anchoring CFRP paste is crucial for efficient shear strengthening. This study investigates the anchoring effect on shear resistance in nine CFRP U-wrapped concrete beams, varying shear span-to-depth ratios (1.0, 1.5, 2.0), and depths from 300 mm to 900 mm. Concurrently, nine unanchored beams and nine plain concrete beams were included in the comparison, considering the influence of beam depth and shear span ratio, referencing the prior research of Jiang et al. (2022). The evaluation of the shear contribution of CFRP with different sizes, particularly in scenarios involving large dimensions and diverse shear span ratios, was conducted. The test results revealed that the anchoring effect is most pronounced in small-scale beams with a large shear span ratio, demonstrating an improvement of over 60% compared to the CFRP shear-strengthened beam without anchoring. In contrast to beams without CFRP wrapping, the shear performance was enhanced by approximately 90%. Additionally, the study analyzed and compared the calculation formulas of shear capacity from different national specifications. Ultimately, a calculation method for CFRP shear resistance was established and its accuracy was verified.
关键词 ：
Shear-span ratio Shear-span ratio Shear failure Shear failure Anchored beam Anchored beam Size effect Size effect Shear contribution Shear contribution
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| GB/T 7714 | Jiang, Xuan'ang , Jin, Liu , Qin, Peng et al. Shear contribution of beams having different structural sizes strengthened in shear with anchored CFRP strips [J]. | MAGAZINE OF CONCRETE RESEARCH , 2024 . |
| MLA | Jiang, Xuan'ang et al. "Shear contribution of beams having different structural sizes strengthened in shear with anchored CFRP strips" . | MAGAZINE OF CONCRETE RESEARCH (2024) . |
| APA | Jiang, Xuan'ang , Jin, Liu , Qin, Peng , Xia, Maoxin , Du, Xiuli . Shear contribution of beams having different structural sizes strengthened in shear with anchored CFRP strips . | MAGAZINE OF CONCRETE RESEARCH , 2024 . |
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摘要 ：
A numerical model utilizing 3D mesoscale simulation methods was developed to investigate the influence of strain rate on the torsional performance of geometrically similar Basalt Fiber Reinforced Polymer bars-reinforced concrete (BFRP-RC) beams, as well as the corresponding size effects. The model incorporates concrete heterogeneity, material strain rate effects, and the dynamic bond-slip relationship between BFRP bars and concrete. The torsional performance of BFRP-RC beams with different structural sizes and stirrup ratios was analyzed under different strain rates. The study yielded the following findings: (1) The damage degree of BFRP-RC beams increases with the rising strain rate. (2) Increasing strain rate and stirrup ratio enhances the beams' torsional strength and ductility while attenuating the size effect, albeit not eliminating it. (3) The impact of increasing strain rate on beam strength, ductility, and size effect outweighs that of increasing stirrup ratio. Finally, based on the Ba & zcaron;ant size effect law (SEL) combined with the simulation results, a new size effect law was proposed that can quantitatively consider the effect of strain rate and stirrup ratio on the torsional strength of BFRP-RC beams.
关键词 ：
size effect size effect stirrup ratio stirrup ratio meso-scale simulation meso-scale simulation dynamic torsional loading dynamic torsional loading BFRP-reinforced concrete beam BFRP-reinforced concrete beam
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| GB/T 7714 | Lei, Yushuang , Jin, Liu , Yu, Wenxuan et al. Behavior of geometrically-similar Basalt FRP bars-reinforced concrete beams under dynamic torsional loads [J]. | INTERNATIONAL JOURNAL OF DAMAGE MECHANICS , 2024 , 33 (9) : 696-724 . |
| MLA | Lei, Yushuang et al. "Behavior of geometrically-similar Basalt FRP bars-reinforced concrete beams under dynamic torsional loads" . | INTERNATIONAL JOURNAL OF DAMAGE MECHANICS 33 . 9 (2024) : 696-724 . |
| APA | Lei, Yushuang , Jin, Liu , Yu, Wenxuan , Du, Xiuli . Behavior of geometrically-similar Basalt FRP bars-reinforced concrete beams under dynamic torsional loads . | INTERNATIONAL JOURNAL OF DAMAGE MECHANICS , 2024 , 33 (9) , 696-724 . |
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摘要 ：
This paper conducted comprehensive axial compressive and splitting-tensile tests to investigate the static and dynamic mechanical properties of basalt fibre reinforced lightweight-aggregate concrete (BFLAC) with fibre volume fractions Vf of 0.0 similar to 0.3% at the temperatures ranging from 20 degrees C to -90 degrees C, with a special focus on the microscopic mechanism analysis and quantitative discussion of low-temperature enhancement effect, strain rate effect and fibre reinforcement effect. Test results show that the splitting-tensile strength, compressive strength, and elastic modulus of lightweight-aggregate concrete (LAC) perform an apparent low-temperature enhancement effect and this enhancement effect can be strengthened by the addition of basalt fibres. More basalt fibres reach the tensile failure strength and undergo rupture failure (Mode-2), resulting in the strain rate effect of BFLAC is slightly more significant than that of LAC; but the influence of low temperature on strain rate effect is mild. The incorporation of 0.3%Vf basalt fibres in LAC can bring at least a 20% increase in nominal strengths, showing an significant fibre reinforcement effect which can be enhanced (with maximum increase of 45.6%) as the temperature drops. Based on test results, the relationships between compressive and splitting-tensile strengths were discussed, and the empirical prediction formulas for predicting the static and dynamic mechanical properties of BFLAC at low temperatures were proposed. Research results of this paper can provide reference for mechanical performance calculation and engineering applications of BFLAC in the low-temperature environment.
关键词 ：
Basalt fibre reinforced lightweight aggregate concrete Basalt fibre reinforced lightweight aggregate concrete Strain rate effect Strain rate effect Fibre reinforcement effect Fibre reinforcement effect Low temperature Low temperature Fibre volume fraction Fibre volume fraction
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| GB/T 7714 | Yu, Wenxuan , Luo, Zhihao , Fan, Meiyu et al. Experimental study and mechanism analysis on static and dynamic mechanical properties of BFLAC at low temperatures [J]. | COLD REGIONS SCIENCE AND TECHNOLOGY , 2024 , 228 . |
| MLA | Yu, Wenxuan et al. "Experimental study and mechanism analysis on static and dynamic mechanical properties of BFLAC at low temperatures" . | COLD REGIONS SCIENCE AND TECHNOLOGY 228 (2024) . |
| APA | Yu, Wenxuan , Luo, Zhihao , Fan, Meiyu , Jin, Liu , Du, Xiuli . Experimental study and mechanism analysis on static and dynamic mechanical properties of BFLAC at low temperatures . | COLD REGIONS SCIENCE AND TECHNOLOGY , 2024 , 228 . |
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摘要 ：
Predicting the low-velocity impact response of the prototype based on the scaled test results is one of the significant topics in structural design and protection. Thus, reliable similarity laws are required to bridge the dynamic similarity between models and prototypes. In this study, numerical modeling was carried out by considering plastic damage and strain rate effects. Then, the impact responses of four series reinforced concrete beams satisfying traditional similarity laws were analyzed. The largest beam section size reached 600 mm x 1000 mm. The scaling effects on the impact force profiles (comprising three Types) and reaction force profiles of the beam were investigated. Several characteristic points were defined for the available simplified profiles of impact and reaction forces. It is shown that the scaling effects on each characteristic are not consistent. As the theoretical scale factor increases, the characteristics such as the peak impact force, the positive peak of the reaction force, and its plateau satisfy the traditional similarity law, whereas the characteristics such as the impact force duration and the negative peak of the reaction force do not. Therefore, modified dynamic scale factors for the characteristics of impact and reaction force profiles from models to prototypes were proposed. Based on the suggested scaling laws, the simplified profiles of impact and support reaction forces of the prototype can be predicted. It is expected that it will help researchers to conduct experimental studies and optimized designs on structural impact resistance.
关键词 ：
Similarity law Similarity law Simplified profile Simplified profile Prototype beam Prototype beam Scaling effect Scaling effect Impact response prediction Impact response prediction
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| GB/T 7714 | Li, Jian , Zhang, Renbo , Jin, Liu et al. Scaling laws of low-velocity impact response for RC beams: Impact force and reaction force [J]. | INTERNATIONAL JOURNAL OF IMPACT ENGINEERING , 2024 , 186 . |
| MLA | Li, Jian et al. "Scaling laws of low-velocity impact response for RC beams: Impact force and reaction force" . | INTERNATIONAL JOURNAL OF IMPACT ENGINEERING 186 (2024) . |
| APA | Li, Jian , Zhang, Renbo , Jin, Liu , Lan, Dongqiu , Du, Xiuli . Scaling laws of low-velocity impact response for RC beams: Impact force and reaction force . | INTERNATIONAL JOURNAL OF IMPACT ENGINEERING , 2024 , 186 . |
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摘要 ：
This paper presents a numerical study on the plastic hinge behavior and rotation capacity of concrete columns reinforced with a combination of steel bars and fiber-reinforced polymer (FRP) bars. A meso-scale numerical model, which considers the internal heterogeneity of concrete and bond behavior between concrete and longitudinal reinforcements, was developed and validated. The failure modes, lateral load-displacement responses, and the physical plastic hinge lengths of hybrid steel-FRP reinforced concrete (SFRC) columns were investigated and compared with those of conventional steel-reinforced concrete columns. The results indicated that the steel yielding zone and curvature localization zone of SFRC columns with FRP longitudinal bars were enlarged, due to the relatively low modulus of FRP bars. After that, a parametric analysis was performed to study the plastic hinge length of SFRC columns with respect to the nominal area ratio of FRP longitudinal bars, shear span-to-depth ratio, axial load ratio, and longitudinal reinforcement ratio. A new empirical model was proposed to predict the equivalent plastic hinge length, which was subsequently integrated into an analytical method for predicting the ultimate rotation. The comparison of predictions with simulation and test results demonstrated the accuracy of both the proposed empirical model and analytical method.
关键词 ：
Plastic hinge length Plastic hinge length Meso-scale modeling Meso-scale modeling Rotation capacity Rotation capacity RC column RC column Hybrid reinforcement Hybrid reinforcement
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| GB/T 7714 | Li, Ping , Jin, Liu , Chen, Wensu et al. Numerical investigation on plastic hinge behavior of hybrid steel-FRP reinforced concrete columns [J]. | ENGINEERING STRUCTURES , 2024 , 322 . |
| MLA | Li, Ping et al. "Numerical investigation on plastic hinge behavior of hybrid steel-FRP reinforced concrete columns" . | ENGINEERING STRUCTURES 322 (2024) . |
| APA | Li, Ping , Jin, Liu , Chen, Wensu , Hao, Hong , Du, Xiuli . Numerical investigation on plastic hinge behavior of hybrid steel-FRP reinforced concrete columns . | ENGINEERING STRUCTURES , 2024 , 322 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
In this study, tests of twenty-four square concrete filled steel tubular (SCFST) columns with different structural sizes by the pseudo-static method were conducted to investigate the influence of the confinement effects. In addition, the structural size and the confinement effect are respectively represented by column width and widthto-thickness ratio. The experimental results, including the failure mode, the lateral load-displacement curves and the indices of the seismic performance were recorded and analyzed. The mode of failure is typical compressive flexure pattern. As the structural size increases or the confinement effect decreases, the nominal flexure strength of SCFST column decreases. Compared of the nominal flexural strength of small column, the influence of confinement effect is more significant on that of large column. The displacement ductility coefficient, the mean energy dissipation factor and the relative stiffness decrease with the increasing column width. Then enhanced confinement effect has no obvious influence on the displacement ductility coefficient of the SCFST column. When the confinement effect increases, the energy dissipation capacity of the SCFST column increases. Finally, the modified calculated method considering size effect is established, and this method is applicable to predict the bending moment of the SCFST column with different confinement effects and structural sizes.
关键词 ：
SCFST column SCFST column Structural size Structural size Seismic behavior Seismic behavior Confinement effect Confinement effect Experimental test Experimental test
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| GB/T 7714 | Liang, Jian , Fan, Lingling , Jin, Liu et al. Behavior of large SCFST column with different confinement effects under pseudo-static loading [J]. | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2024 , 214 . |
| MLA | Liang, Jian et al. "Behavior of large SCFST column with different confinement effects under pseudo-static loading" . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH 214 (2024) . |
| APA | Liang, Jian , Fan, Lingling , Jin, Liu , Li, Ping , Du, Xiuli . Behavior of large SCFST column with different confinement effects under pseudo-static loading . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2024 , 214 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
In this study, the mechanical behavior of geometrically similar square concrete filled steel tubular (SCFST) columns under axial compression was investigated using numerical modeling. The effects of the confinement effect and structural size on the axial compressive behavior of the SCFST column were studied. A 3D mesoscale model of the SCFST column under axial compression was established and verified using available test results. The failure mode and the nominal axial stress -axial strain curve were then presented and analyzed. The effects of the steel ratio and section size on the failure mode of the SCFST column were not obvious. As the section size of the SCFST column increases, the peak axial stress and corresponding peak axial strain show a descending trend. Specifically, as the section size changes from 100 mm to 800 mm, the peak axial stress decreases by 46.2% and 23.8% corresponding to the steel ratios of 0.0 and 0.21. With an increase in the steel ratio increases and enhanced confinement effect, the influence of the size effect on the peak axial stress decreases. For the outer steel tube, the vertical stress increases and the hoop stress decreases with the increasing section size, leading to the weakened confinement effect. Subsequently, an empirical formula considering the size effect was proposed to calculate the axial bearing capacity of SCFST columns with different structural sizes and confinement effects. The proposed empirical equation was validated using collected test results. This equation can be applied to predict the axial load bearing capacity of SCFST columns with different structural sizes and steel ratios, especially for large structural sizes.
关键词 ：
Axial compression behavior Axial compression behavior Axial load bearing capacity Axial load bearing capacity Size effect Size effect Concrete filled steel tubular column Concrete filled steel tubular column
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| GB/T 7714 | Liang, Jian , Li, Ping , Jin, Liu et al. Influences of structural size and confinement effect on the axial compressive behavior of SCFST columns [J]. | STRUCTURES , 2024 , 61 . |
| MLA | Liang, Jian et al. "Influences of structural size and confinement effect on the axial compressive behavior of SCFST columns" . | STRUCTURES 61 (2024) . |
| APA | Liang, Jian , Li, Ping , Jin, Liu , Fan, Lingling , Du, Xiuli . Influences of structural size and confinement effect on the axial compressive behavior of SCFST columns . | STRUCTURES , 2024 , 61 . |
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摘要 ：
Reinforced concrete (RC) columns are prone to shear failure under seismic loads, particularly in the case of short columns. However, this brittle failure may have more adverse effects on large-sized columns. To address this issue, a common solution is to retrofit RC columns using fiber-reinforced polymer (FRP) laminates to improve seismic performance. The primary objective of this study is to assess the shear performance and size effect of rectangular RC columns confined using carbon fiber-reinforced polymer (CFRP). To account for the heterogeneity of concrete, a mesoscale numerical approach is developed using a random aggregate model. The investigation focuses on impacts of the axial compression ratio and CFRP volumetric ratio. Results show that the cross-sectional size has little effect on the final failure mode of the columns. However, the width of the main diagonal crack is reduced as the cross-sectional height increases. It can be observed that the size effect on the CFRP rupture hoop strain distribution is primarily manifested in the strain value rather than the shape of the distribution. The size effect is evident in the total shear strength of columns and in the CFRP shear contribution, with the effect becoming more pronounced with increasing axial compression ratio. Taking into account the influences of size on the CFRP shear contribution and shear strength of RC columns as well as the CFRP confinement effect on concrete, the calculation model of shear capacity is established based on a new proposed FRP effective strain model available for rectangular columns. The proposed model can provide a more accurate prediction on shear capacity of rectangular CFRP-confined RC columns compared with existing design codes.
关键词 ：
CFRP volumetric ratio CFRP volumetric ratio Mesoscale numerical method Mesoscale numerical method Shear capacity Shear capacity Rectangular CFRP-confined RC columns Rectangular CFRP-confined RC columns Size effect Size effect Axial compression ratio Axial compression ratio
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| GB/T 7714 | Fan, Lingling , Jin, Liu , Zhao, Ou et al. Mesoscale Modeling and Simulation of Size-Dependent Shear Response of Rectangular CFRP-Confined RC Columns [J]. | JOURNAL OF COMPOSITES FOR CONSTRUCTION , 2024 , 28 (1) . |
| MLA | Fan, Lingling et al. "Mesoscale Modeling and Simulation of Size-Dependent Shear Response of Rectangular CFRP-Confined RC Columns" . | JOURNAL OF COMPOSITES FOR CONSTRUCTION 28 . 1 (2024) . |
| APA | Fan, Lingling , Jin, Liu , Zhao, Ou , Li, Ping , Liang, Jian , Du, Xiuli . Mesoscale Modeling and Simulation of Size-Dependent Shear Response of Rectangular CFRP-Confined RC Columns . | JOURNAL OF COMPOSITES FOR CONSTRUCTION , 2024 , 28 (1) . |
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摘要 ：
The ultimate rotation capacity, depending on the plastic hinge length, is a vital factor in the seismic design of flexural members. This paper focuses on the investigation of the plastic hinge length and size effect of rectangular carbon fiber-reinforced polymer (CFRP)-confined reinforced concrete (RC) columns. Firstly, considerable scatter and evident bias of the calculation results were found after evaluating existing models for calculating the plastic hinge length of FRP-confined RC columns. Accordingly, a meso-scale numerical approach was developed, with concrete heterogeneity considered, to investigate the influences of the confinement ratio and corner radius on the plastic hinge length and size effect of rectangular CFRP-confined RC columns. Results show that columns having different cross-sectional sizes exhibit similar failure patterns, and the region of lateral crack propagation for columns with lower confinement ratios is larger than that for columns with higher confinement ratios. The actual plastic hinge length is determined based on the yielding zone of reinforcement, the crushing zone of concrete, and the localization zone of curvature, while the localization zone of curvature is employed to determine the real plastic hinge zone. The size effect is found to exist in the plastic hinge length ratio, and it is weakened with the increase of the corner radius, which can be attributed to the fact that columns with higher corner ratios have more effective confinement. Taking into account the size effect, a new model for calculating the ultimate drift ratio of CFRP-confined RC columns was proposed based on an assumption of curvature distribution and presented accurate predictions.
关键词 ：
Size effect Size effect Ultimate drift ratio Ultimate drift ratio Plastic hinge length Plastic hinge length Rectangular column Rectangular column Meso-scale numerical analysis Meso-scale numerical analysis
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| GB/T 7714 | Fan, Lingling , Jin, Liu , Zhao, Ou et al. Plastic hinge behavior of rectangular CFRP-confined RC columns: Meso-scale modelling and formulation [J]. | ENGINEERING STRUCTURES , 2024 , 307 . |
| MLA | Fan, Lingling et al. "Plastic hinge behavior of rectangular CFRP-confined RC columns: Meso-scale modelling and formulation" . | ENGINEERING STRUCTURES 307 (2024) . |
| APA | Fan, Lingling , Jin, Liu , Zhao, Ou , Liang, Jian , Li, Ping , Du, Xiuli . Plastic hinge behavior of rectangular CFRP-confined RC columns: Meso-scale modelling and formulation . | ENGINEERING STRUCTURES , 2024 , 307 . |
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