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学者姓名：金浏
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Abstract ：
In this study, four sets of steel beams of three strength classes with similar geometries were built for episodic but extremely hazardous impact loads to investigate the scaling effects on their dynamic responses at different impact energies, mainly analyzing the effects of structural scaling and impact energies on the damage modes of the beams, the mid-span displacements, the impact forces, and the support reaction forces. The results of the numerical study show that when the impact energy is low, the impact response of the steel beam conforms to the classical similarity law. This is demonstrated by the fact that the normalized displacement, impact force, peak support reaction force, and member energy absorption are almost the same, do not vary with size, and are not affected by steel strength. At higher impact energies, the various dynamic responses deviate from the classical similarity law by up to 45 % and are less affected by steel strength. The scaling effect occurs because, at high energy levels, a steel beam may enter a plastic state or even yield. The area (or volume) that yields and the extent of yielding do not change consistently with variations in size. In addition, the combination of static loading methods yields that the impact energy required for a steel beam to exhibit the scaling effect is approximately three times the energy needed for the beam to enter the yielding stage. In this paper, empirical quantitative formulas (i.e., similarity laws) for predicting the variation of steel beam displacements, impact forces, support reactions, and member energy absorption with size are given based on numerical simulations, and some of the formulas given in the paper are verified in conjunction with previous studies.
Keyword ：
Empirical prediction Empirical prediction Impact response Impact response Structural scale Structural scale Geometrically similar steel beam Geometrically similar steel beam Scaling effect Scaling effect Similarity law Similarity law
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| GB/T 7714 | Zhang, Renbo , Hao, Shaohua , Jin, Liu et al. Scaling effect on impact responses of steel beams and its energy threshold [J]. | INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES , 2025 , 287 . |
| MLA | Zhang, Renbo et al. "Scaling effect on impact responses of steel beams and its energy threshold" . | INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES 287 (2025) . |
| APA | Zhang, Renbo , Hao, Shaohua , Jin, Liu , Du, Xiuli . Scaling effect on impact responses of steel beams and its energy threshold . | INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES , 2025 , 287 . |
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Abstract ：
This study employs a multiscale numerical approach to establish models of reinforced concrete (RC) beams under different structural spatial constraints to investigate the influence of structural spatial constraints (beam end constraints and adding cast-in-place floor slabs) on the yield mechanism of frame structures. It quantitatively analyzed the influence of end restraints and cast-in-place floor slabs on the shear capacity and stiffness of RC beams. It revealed the mechanisms by which end restraints and cast-in-place floor slabs affect the shear behavior of RC beams and compared the simulated results with the load capacity calculated results according to current codes of various countries. The study found the following: 1) Beam end restraint conditions significantly affect the beams' failure mode, whereas cast-in-place floor slabs have little effect. 2) Changing the beam end restraint from simple to fixed supported dramatically increases the stiffness and shear capacity of the beams. Fixed-end beams can have stiffness and shear capacity up to 3.49 times and 2.66 times higher, respectively, compared to simply supported beams. 3) Adding cast-in-place floor slabs significantly increases the shear capacity and stiffness of the beams. Adding cast-in-place floor slabs to simply and fixed supported beams can increase the shear bearing capacity of the beams by 1.50 times and 1.39 times, respectively, and increase the stiffness by 2.68 times and 1.63 times, respectively; 4) The prediction of the shear bearing capacity of fixed supported beams and beams with cast-in-place floor slabs in various national codes is exceptionally conservative. The simulated values of fixed-supported plus cast-in-place slab beams with a shear-span ratio of 1.0 are 4.00 times, 4.47 times, 6.16 times, and 5.18 times higher than the calculated values in Chinese, American, Canadian, and European codes.
Keyword ：
beam-end restraint beam-end restraint cast-in-place floor slabs cast-in-place floor slabs Reinforced concrete beam Reinforced concrete beam shear performance shear performance meso-scale simulation meso-scale simulation strong beam weak column strong beam weak column
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| GB/T 7714 | Lei, Yushuang , Jin, Liu , Du, Xiuli . The Influence of Structural Spatial Constraints on the Shear Performance of RC Beams [J]. | JOURNAL OF EARTHQUAKE ENGINEERING , 2025 . |
| MLA | Lei, Yushuang et al. "The Influence of Structural Spatial Constraints on the Shear Performance of RC Beams" . | JOURNAL OF EARTHQUAKE ENGINEERING (2025) . |
| APA | Lei, Yushuang , Jin, Liu , Du, Xiuli . The Influence of Structural Spatial Constraints on the Shear Performance of RC Beams . | JOURNAL OF EARTHQUAKE ENGINEERING , 2025 . |
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Abstract ：
Fire is a significant factor that can lead to progressive collapse in structures. Due to spatial limitations, scaled models are often employed in collapse experiments. However, traditional similarity laws for fire testing require scaled models to experience heating rates much higher than those of the prototype, which is difficult to achieve with standard fire furnaces. This study addresses this challenge by conducting numerical analyses on geometrically scaled reinforced RC beam-column structures. A unified similarity law for fire duration is proposed, incorporating key design parameters such as span-depth ratio, reinforcement ratio, and concrete cover thickness. This law enables scaled models to replicate progressive collapse behavior of RC prototype frames. The results reveal that similar mechanical performance can be achieved when rebar and average beam-section temperatures are comparable, despite variations in internal concrete temperatures. Additionally, smaller span-depth ratios cause more severe beam damage under fire exposure. Increasing span-depth ratios from 10 to 12 and 14 has minimal impact on load capacity at ambient temperature. However, smaller span-depth ratios result in higher ultimate load capacity after prolonged fire exposure. These findings provide a practical approach for scaling fire- induced collapse experiments and highlight the role of the key design parameters in determining structural performance under elevated temperatures.
Keyword ：
Scaling law Scaling law RC structure RC structure Progressive collapse Progressive collapse Prototype frame Prototype frame Fire conditions Fire conditions
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| GB/T 7714 | Lan, Dongqiu , Jin, Liu , Yang, Yaowen et al. A scaling law for fire duration in RC frames to resist fire-induced progressive collapse: Considering critical design parameters [J]. | ENGINEERING STRUCTURES , 2025 , 332 . |
| MLA | Lan, Dongqiu et al. "A scaling law for fire duration in RC frames to resist fire-induced progressive collapse: Considering critical design parameters" . | ENGINEERING STRUCTURES 332 (2025) . |
| APA | Lan, Dongqiu , Jin, Liu , Yang, Yaowen , Zhang, Renbo , Li, Jian , Qian, Kai . A scaling law for fire duration in RC frames to resist fire-induced progressive collapse: Considering critical design parameters . | ENGINEERING STRUCTURES , 2025 , 332 . |
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Abstract ：
This paper evaluates the seismic performance of carbon fiber reinforced polymer (CFRP)-strengthened shear walls under various CFRP configurations. A comprehensive experimental investigation was conducted on five shear walls specimens. One specimen served as un-strengthened reference specimen, while the remaining four were respectively strengthened using horizontal, X-shaped, combined, and fully wrapped CFRP strips. Based on the test results, the effects of CFRP configurations on the failure modes, shear bearing capacities, and deformation capabilities were thoroughly evaluated. At the same CFRP ratio, the combined strip method significantly enhanced the shear bearing capacity by 27.8 % compared to the un-strengthened specimen. In contrast, the Xshaped strip method showed a limited increase in shear bearing capacity of 6.39 %. Further analyses on the strengthening efficiency of different CFRP configurations revealed that horizontal strips method exhibited the highest strengthening efficiency for the shear strength, stiffness, ductility, and energy dissipation, while the Xshaped method exhibited the least effectiveness due to early debonding of the CFRP strips. Finally, the actual shear contribution of CFRP obtained from experiments were compared with the predicted values from current standards, with the comparison results revealing an overestimation of the CFRP shear contribution. To improve the accuracy of CFRP shear contribution predictions, the effective strain reduction coefficient capturing the effects of CFRP configurations was proposed.
Keyword ：
Seismic performance Seismic performance Strengthening efficiency Strengthening efficiency CFRP-strengthened shear wall CFRP-strengthened shear wall Experimental evaluation Experimental evaluation CFRP configurations CFRP configurations
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| GB/T 7714 | Zhang, Binlin , Jin, Liu , Zhao, Ou et al. Experimental evaluation of CFRP-strengthened shear walls with various CFRP configurations [J]. | THIN-WALLED STRUCTURES , 2025 , 208 . |
| MLA | Zhang, Binlin et al. "Experimental evaluation of CFRP-strengthened shear walls with various CFRP configurations" . | THIN-WALLED STRUCTURES 208 (2025) . |
| APA | Zhang, Binlin , Jin, Liu , Zhao, Ou , Chen, Fengjuan , Du, Xiuli . Experimental evaluation of CFRP-strengthened shear walls with various CFRP configurations . | THIN-WALLED STRUCTURES , 2025 , 208 . |
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Abstract ：
To solve the corrosion problems of steel bars in reinforced concrete (RC) structures and brittle damage in pure fiber-reinforced polymer (FRP) reinforced concrete structures, hybrid-reinforced concrete (hybrid-RC) structures combining FRP and steel bars have been proposed. The studies on hybrid-RC structures have focused on static loading conditions, while the structures may also be subjected to impact loading, leading to significant damage. Due to the difference in the properties of FRP and steel bars, FRP bars are always equivalent to steel bars based on different principles in calculation and design, e.g., equal-area, equal-strength, and equal-stiffness. In this work, to investigate the impact behavior of hybrid-RC beams and the influence of design principles, 17 specimens were designed and modeled using Basalt FRP (BFRP) bars replacing steel bars. The results show that the equalstrength-reinforced beams have the smallest damage extent, and the largest impact and reaction forces. While the equal-stiffness-reinforced beams have the greatest damage extent, the beams exhibited a better deformation and deformation recovery capacity. The impact resistance of equal-area-reinforced beams is between the remaining two. Besides, to fully utilize the material performance, for structures with high deformation and damage control requirements, it is recommended to use equal-strength-reinforced beams; for structures that need to reduce residual deflections, impact forces and reaction forces, equal-stiffness-reinforced beams are suggested; and if the economy of the materials is considered, equal-area-reinforced beams may be the preferred choice. The current study could be a reference for impact-resistant design for hybrid-RC structures.
Keyword ：
Concrete beam Concrete beam Hybrid reinforcement Hybrid reinforcement Basalt fiber-reinforced polymer (BFRP) bars Basalt fiber-reinforced polymer (BFRP) bars Impact response Impact response Equivalence design principle Equivalence design principle
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| GB/T 7714 | Zhang, Renbo , Li, Xinchen , Jin, Liu et al. Impact response of steel-BFRP hybrid-reinforced beams designed with different reinforcement equivalence principles [J]. | ENGINEERING STRUCTURES , 2025 , 333 . |
| MLA | Zhang, Renbo et al. "Impact response of steel-BFRP hybrid-reinforced beams designed with different reinforcement equivalence principles" . | ENGINEERING STRUCTURES 333 (2025) . |
| APA | Zhang, Renbo , Li, Xinchen , Jin, Liu , Du, Xiuli . Impact response of steel-BFRP hybrid-reinforced beams designed with different reinforcement equivalence principles . | ENGINEERING STRUCTURES , 2025 , 333 . |
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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 ：
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 ：
A carbon fiber-reinforced polymer (CFRP) is a common material utilized for the enhancement in reinforced concrete (RC) constructions. Previous research indicates that the bonding performance between a CFRP sheet and concrete determines whether the bonding of CFRP material is effective. However, the majority of existing research on the bonding performance of the CFRP-concrete interface is concentrated on static loading conditions. In order to clarify the effect of dynamic load on the bonding performance of the CFRP sheet-concrete interface, this study adopts the double-sided shear test method to carry out dynamic experimental research. The test findings reveal that the damage pattern of the CFRP sheet-concrete interface remains consistent across different loading rates. The ultimate bearing capacity increases as the strain rate increases. As the strain rate increases from 10-5 s-1 to 10-2 s-1, the effect of bond length on ultimate bearing capacity increases by about 7%. As the strain rate increases, both the maximum strain of CFRP and the maximum interfacial shear stress demonstrate a corresponding increase, with respective increase rates of 60% and 20%. The effective bond length decreases by about 20% when the strain rate rises from 10-5 s-1 to 10-2 s-1. Finally, a formula for calculating the dynamic effective bond length of a CFRP sheet, grounded in the Chen and Teng formula, has been proposed and verified.
Keyword ：
CFRP strain CFRP strain CFRP sheet-concrete interaction CFRP sheet-concrete interaction loading rates loading rates dynamic effective bond length dynamic effective bond length stripping bearing capacity stripping bearing capacity
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| GB/T 7714 | Li, Dong , Wang, Xinrui , Zhang, Jiangxing et al. An Experimental Study and Result Analysis on the Dynamic Effective Bond Length of a Carbon Fiber-Reinforced Polymer Sheet Attached to a Concrete Surface [J]. | BUILDINGS , 2024 , 14 (10) . |
| MLA | Li, Dong et al. "An Experimental Study and Result Analysis on the Dynamic Effective Bond Length of a Carbon Fiber-Reinforced Polymer Sheet Attached to a Concrete Surface" . | BUILDINGS 14 . 10 (2024) . |
| APA | Li, Dong , Wang, Xinrui , Zhang, Jiangxing , Jin, Liu , Du, Xiuli . An Experimental Study and Result Analysis on the Dynamic Effective Bond Length of a Carbon Fiber-Reinforced Polymer Sheet Attached to a Concrete Surface . | BUILDINGS , 2024 , 14 (10) . |
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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 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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