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学者姓名：李亮
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Abstract ：
In order to study the static and direct dynamic tensile behaviors of steel-polyethylene hybrid fiber reinforced engineered cementitious composites (ST/PE-HFRECC), tests were conducted using a static test machine and the split Hopkinson tension bar (SHTB), respectively. The influence factors of interest in the study included the blend ratio of steel and polyethylene fibers in the ST/PE-HFRECC (Total fiber content is 2 %.), the strain rate (Range: 10-5 s- 1 - 100 s-1). The conclusions are as follows: (1) Increasing the polyethylene fiber content increases the static ductility of ST/PE-HFRECC. Increasing the steel fiber content causes its static brittle damage. Static ductility of polyethylene fiber reinforcement is superior to that of steel fibers. (2) The tensile strength, ultimate strain, energy absorption, and dynamic increase factor of ST/PE-HFRECC exhibit strain rate enhancement effect. Increased strain rate changes the damage state from multi-seam to main seam cracking. PE fibers increase strength and toughness better than steel fibers at different strain rates. (3) Increased polyethylene fiber content results in a more obvious strain-hardening effect and an increase in ultimate strain for ST/PE-HFRECC. 1.5 % or more polyethylene fibers increase the sensitivity of its tensile strength to strain rate. (4) The optimum fiber mixing ratio of ST/PE-HFRECC at various strain rates is different. Therefore, the correct fiber mixing method that matches the engineering application demand is important.
Keyword ：
cementitious composites cementitious composites Fiber blend ratio Fiber blend ratio Direct dynamic tensile test Direct dynamic tensile test Steel-polyethylene hybrid fiber engineered Steel-polyethylene hybrid fiber engineered Strain rate Strain rate The split Hopkinson tension bar The split Hopkinson tension bar Mechanical properties Mechanical properties
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| GB/T 7714 | Li, Liang , Li, Zhengpeng , Wu, Jun et al. Influence of strain rate and fiber blend mode on the tensile behaviors of steel-polyethylene hybrid fiber reinforced engineered cementitious composites [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 438 . |
| MLA | Li, Liang et al. "Influence of strain rate and fiber blend mode on the tensile behaviors of steel-polyethylene hybrid fiber reinforced engineered cementitious composites" . | CONSTRUCTION AND BUILDING MATERIALS 438 (2024) . |
| APA | Li, Liang , Li, Zhengpeng , Wu, Jun , Li, Tangjun , Du, Xiuli . Influence of strain rate and fiber blend mode on the tensile behaviors of steel-polyethylene hybrid fiber reinforced engineered cementitious composites . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 438 . |
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Abstract ：
In the current study, a multiaxial LITS model of concrete was innovatively developed. This model can predict the behavior of concrete subjected to wide applied load level ranges from 20 % to 80 % and temperatures up to 800 degrees C. A 3D LITS model is developed through a triaxial compression stress confinement implementation and Poisson's ratio. Considering the water evaporation of concrete under high temperature, a third order polynomial LITS derivative function and an exponential derivative function were proposed to characterize the effects of the stress confinement and thermal effect. In order to comprehensively predict the performance of concrete subjected to multiaxial compressive loads in fire, an orthotropic triaxial compression thermo-mechanical damage model for concrete is developed. The effect of LITS on the multiaxial stress-strain response was considered in the multiaxial model. The coupling thermo-mechanical contributions containing the development of LITS among thermal effect, stress confinement, damage and plastic hardening evolution were creatively considered in the potential function within thermodynamics framework. The numerical calculations of this proposed model were conducted for validation. The effect of LITS on the multiaxial stress-strain response was studied. The nonlinear stress-strain responses of concrete were accurately captured at temperatures ranges from 20 degrees C to 1000 degrees C through the comparative study with test results in literatures, which indicates the accuracy and applicability of the proposed model.
Keyword ：
Thermo-mechanical damage model Thermo-mechanical damage model Load Induced Thermal Strain Load Induced Thermal Strain Stress-strain relationship Stress-strain relationship Multiaxial compression characterization Multiaxial compression characterization Elevated temperature Elevated temperature
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| GB/T 7714 | Wang, Hongwei , Li, Liang , Du, Xiuli . A multiaxial thermo-mechanical damage model for concrete including Load Induced Thermal Strain (LITS) [J]. | STRUCTURES , 2024 , 67 . |
| MLA | Wang, Hongwei et al. "A multiaxial thermo-mechanical damage model for concrete including Load Induced Thermal Strain (LITS)" . | STRUCTURES 67 (2024) . |
| APA | Wang, Hongwei , Li, Liang , Du, Xiuli . A multiaxial thermo-mechanical damage model for concrete including Load Induced Thermal Strain (LITS) . | STRUCTURES , 2024 , 67 . |
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Abstract ：
A semi-analytical method for the near-field antiplane wave propagation analysis in the layered fluid-saturated porous media (FSPM) is proposed based on the Biot u-U dynamic formulation. The wave propagation equations of the FSPM are decoupled by the variable-separating method. The thin-layer element method (TLEM) is applied to discretize the infinite domain and construct the consistent artificial boundary condition. The finite element method (FEM) is adopted for the space discretization of the finite domain and the numerical solution of the dynamic response. The proposed method is validated by the comparison of the numerical results of this method with those in the published references and acquired from the remote artificial boundary. Subsequently, this method is applied to investigate typical near-field antiplane wave propagation problems in the FSPM. Parametric sensitivity investigations are also executed to explore the impact of mechanical parameters, including permeability coefficients, porosity, and shear modulus of the solid phase, on the dynamic response of the FSPM. The study results confirm the efficacy and efficiency of the proposed method in the near-field antiplane wave propagation analysis in the FSPM.
Keyword ：
finite element method finite element method consistent artificial boundary condition consistent artificial boundary condition near-field antiplane wave propagation near-field antiplane wave propagation fluid-saturated porous media fluid-saturated porous media thin-layer element method thin-layer element method variable-separating method variable-separating method
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| GB/T 7714 | Li, Liang , Wang, Man , Jiao, Hongyun et al. A Semi-Analytical Method for Simulating Near-Field Antiplane Wave Propagation in Layered Fluid-Saturated Porous Media [J]. | INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS , 2024 . |
| MLA | Li, Liang et al. "A Semi-Analytical Method for Simulating Near-Field Antiplane Wave Propagation in Layered Fluid-Saturated Porous Media" . | INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS (2024) . |
| APA | Li, Liang , Wang, Man , Jiao, Hongyun , Du, Xiuli , Shi, Peixin . A Semi-Analytical Method for Simulating Near-Field Antiplane Wave Propagation in Layered Fluid-Saturated Porous Media . | INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS , 2024 . |
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Abstract ：
基于包含惯性耦合（耦合质量密度系数）的u-p形式饱和两相介质弹性波动方程，开展了对饱和两相介质近场波动问题时域全显式数值计算方法的研究。通过对波动方程中的质量集中矩阵和流体压缩矩阵对角化处理，消除了方程中的动力耦联的影响。分别应用中心差分法和Newmark常平均加速度法求解固相位移和固相速度，基于向后差分法求解孔隙流体压力，建立了考虑惯性耦合的饱和两相介质的时域显式数值计算方法。将该方法的数值解与相应的解析解进行对比，二者符合良好，验证了该方法的正确性。将该方法应用于饱和两相介质自由场的地震反应问题，研究了惯性耦合对两相介质动力反应的影响。基于本文研究的两种情况表明，惯性耦合对饱和两相介质动力反应的影响程度有限。
Keyword ：
动力反应 动力反应 惯性耦合 惯性耦合 饱和两相介质 饱和两相介质 u-p形式波动方程 u-p形式波动方程 时域全显式数值算法 时域全显式数值算法
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| GB/T 7714 | 徐静茹 , 李亮 , 宋佳 . 考虑惯性耦合的两相介质动力反应显式数值计算方法 [J]. | 防灾减灾工程学报 , 2023 , 43 (05) : 1009-1015 . |
| MLA | 徐静茹 et al. "考虑惯性耦合的两相介质动力反应显式数值计算方法" . | 防灾减灾工程学报 43 . 05 (2023) : 1009-1015 . |
| APA | 徐静茹 , 李亮 , 宋佳 . 考虑惯性耦合的两相介质动力反应显式数值计算方法 . | 防灾减灾工程学报 , 2023 , 43 (05) , 1009-1015 . |
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Abstract ：
The dynamic properties of concrete structures after being exposed to high temperatures play a crucial role in post-disaster repair and accident prevention measures. This study examined three different mixture ratios of Steel Fiber Reinforced Concrete (SFRC) with matrix strength of C60 and steel fiber contents of 0%, 1%, and 2%. A Split Hopkinson Pressure Bar (SHPB) with a diameter of 75 mm, along with a heating furnace, was employed to comprehensively investigate the dynamic compression behavior of materials. The specimens were exposed to temperatures ranging from 200 degrees C to 600 degrees C. In addition to evaluating the extent of mechanical degradation in SFRC after cooling, auxiliary impact experiments were also carried out at ambient temperature. The experimental data revealed that the dynamic peak stress and peak strain initially increased but eventually decreased as the loading rates continued to rise. The degree of strengthening, toughening, and energy absorption capacity of concrete materials progressively decreased as the escalation of strain rate after the cooling process. Moreover, the inclusion of steel fibers proved effective in preventing cracking and damage to the concrete, preserving the integrity of specimens even at higher temperatures. Simultaneously, the residual stress and deformation capacity of SFRC showed considerable enhancement after exposure to elevated temperatures.
Keyword ：
Dynamic Increase Factor (DIF) Dynamic Increase Factor (DIF) Natural cooling after high temperatures Natural cooling after high temperatures Steel Fiber Reinforced Concrete (SRFC) Steel Fiber Reinforced Concrete (SRFC) Split Hopkinson Pressure Bar (SHPB) Split Hopkinson Pressure Bar (SHPB) Dynamic compressive performance Dynamic compressive performance
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| GB/T 7714 | Li, Liang , Wang, Zichen , Wu, Jun et al. Comparative analysis of dynamic mechanical properties of steel fiber reinforced concrete under ambient temperature and after exposure to high temperatures [J]. | CASE STUDIES IN CONSTRUCTION MATERIALS , 2023 , 20 . |
| MLA | Li, Liang et al. "Comparative analysis of dynamic mechanical properties of steel fiber reinforced concrete under ambient temperature and after exposure to high temperatures" . | CASE STUDIES IN CONSTRUCTION MATERIALS 20 (2023) . |
| APA | Li, Liang , Wang, Zichen , Wu, Jun , Du, Xiuli , Wang, Hongwei , Liu, Wenli . Comparative analysis of dynamic mechanical properties of steel fiber reinforced concrete under ambient temperature and after exposure to high temperatures . | CASE STUDIES IN CONSTRUCTION MATERIALS , 2023 , 20 . |
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Abstract ：
Bridge piers have a high risk of being attacked in wartime, which has the potential to trigger progressive bridge collapse. This study aims to predict the failure probability of reinforced con-crete (RC) piers exposed to military attack scenarios. Field explosion test and axial compression test were conducted to investigate the damage and post-blast performance of the RC pier first. Then, the uncertainties sourcing from the weapon accuracy were investigated. A performance -based (PB) vulnerability probabilistic assessment framework is developed which combines the Monte Carlo simulation (MCS) with a full-scale finite element (FE) model which was verified with test results. A probabilistic vulnerability assessment of a typical RC pier subjected to stochastic blast loading is conducted, and the vulnerability curve corresponding to three performance levels is developed. In addition, the damage modes and post-blast performance of the RC pier under blast loading are analyzed. Results show that the blast-induced damage to an RC pier had a significant influence on the axial bearing capacity, and the pier presents different damage modes at different scaled distances, which has a critical value of 0.65 m/kg1/3 between local and global damage modes. The failure probability of the pier corresponding to different performance levels increased with an increase in the TNT charge. The pier's probability of collapse is less than 20 % when the TNT charge weight does not exceed 500 kg.
Keyword ：
Damage mode Damage mode Blast loads Blast loads Probabilistic vulnerability analysis Probabilistic vulnerability analysis Axial load bearing capacity Axial load bearing capacity Bridge pier Bridge pier
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| GB/T 7714 | Lv, Chenxu , Yan, Qiushi , Li, Liang et al. Field test and probabilistic vulnerability assessment of a reinforced concrete bridge pier subjected to blast loads [J]. | ENGINEERING FAILURE ANALYSIS , 2023 , 143 . |
| MLA | Lv, Chenxu et al. "Field test and probabilistic vulnerability assessment of a reinforced concrete bridge pier subjected to blast loads" . | ENGINEERING FAILURE ANALYSIS 143 (2023) . |
| APA | Lv, Chenxu , Yan, Qiushi , Li, Liang , Li, Shutao . Field test and probabilistic vulnerability assessment of a reinforced concrete bridge pier subjected to blast loads . | ENGINEERING FAILURE ANALYSIS , 2023 , 143 . |
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Abstract ：
Near-field wave propagation of the fluid-saturated porous media (FSPM) is an important issue in soil dynamics and geotechnical earthquake engineering. In the current study, a fully explicit staggered algorithm for the near-field wave propagation analysis of the FSPM in the time domain is developed based on the u-p dynamic formulation. The decoupling of dynamic formulation is implemented by the diagonalization of the mass matrix and pore fluid compressibility matrix. The central difference method and Newmark constant average acceleration method are used for the solution of the displacement and velocity of solid skeleton, and the backward difference method is used for the solution of pore fluid pressure in the time domain. The effectiveness and feasibility of the matrix diagonalization are verified by the comparison with the classical numerical algorithm. The proposed algorithm is also validated by the comparison of the numerical results with the corresponding analytical solution results. Combing with the transmitting artificial boundary condition, the proposed algorithm is then applied to investigate the seismic response of a FSPM free field, and its applicability to the typical near-field wave propagation problems of the FSPM is indicated. The stability analysis of the proposed algorithm is finally conducted, and the corresponding stability criterion is presented. For the proposed algorithm, all the dynamic variables of the FSPM are solved in an iterative way and the coupling dynamic equations need not to be solved at each time step. The computational effort can be reduced considerably, and the computational efficiency can be improved remarkably.
Keyword ：
fluid-saturated porous media fluid-saturated porous media fully explicit staggered algorithm fully explicit staggered algorithm u-p dynamic formulation u-p dynamic formulation near-field wave propagation near-field wave propagation dynamic response dynamic response transmitting artificial boundary condition transmitting artificial boundary condition
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| GB/T 7714 | Li Liang , Xu Jingru , Du Xiuli et al. A fully explicit staggered algorithm for near-field wave propagation of fluid-saturated porous media based on u-p dynamic formulation [J]. | INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS , 2022 , 46 (18) : 3283-3309 . |
| MLA | Li Liang et al. "A fully explicit staggered algorithm for near-field wave propagation of fluid-saturated porous media based on u-p dynamic formulation" . | INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS 46 . 18 (2022) : 3283-3309 . |
| APA | Li Liang , Xu Jingru , Du Xiuli , Song Jia . A fully explicit staggered algorithm for near-field wave propagation of fluid-saturated porous media based on u-p dynamic formulation . | INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS , 2022 , 46 (18) , 3283-3309 . |
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Abstract ：
Dynamic compressive tests of sand under passive confining pressure were carried out using a Split Hopkinson Pressure Bar (SHPB) setup. The dynamic response, energy dissipation and particle-breaking behaviors of sand subjected to high-speed impact were investigated. Sand specimens with moisture contents of 0%, 2%, 4%, 8%, 10% and 12% and relative densities of 0.1, 0.5 and 0.9 were prepared. The variation in the strain rate was controlled between 90 s(-1) and 500 s(-1). The specimens were confined in a designed sleeve to create passive confining pressure. The experimental results show that the sand specimens were extremely sensitive to the strain rate. When the strain rate was less than 400 s(-1), the stress and strain of the specimens increased with the increase in the strain rate but decreased when the strain rate exceeded 400 s(-1). The peak strain and peak stress increased with the increase in the relative density. Particle breakage was aggravated with the strain-rate increase. Compared with the specimen without water, the relative breakage rate of the specimen with a moisture content of 12% decreased by 30.53% when the strain rate was about 95 s(-1) and by 25.44% when the strain rate was about 460 s(-1). The analysis of energy dissipation revealed the essential cause of sand destruction. The specific energy absorption rate increased with the increases in the initial relative density and moisture content.
Keyword ：
SHPB SHPB particle breakage particle breakage passive confining pressure passive confining pressure dynamic compressive behaviors dynamic compressive behaviors impact dynamic response impact dynamic response sand sand
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| GB/T 7714 | Li, Liang , Kou, Xinyu , Zhang, Gao et al. Experimental Study on Dynamic Compressive Behaviors of Sand under Passive Confining Pressure [J]. | MATERIALS , 2022 , 15 (13) . |
| MLA | Li, Liang et al. "Experimental Study on Dynamic Compressive Behaviors of Sand under Passive Confining Pressure" . | MATERIALS 15 . 13 (2022) . |
| APA | Li, Liang , Kou, Xinyu , Zhang, Gao , Huang, Kewei . Experimental Study on Dynamic Compressive Behaviors of Sand under Passive Confining Pressure . | MATERIALS , 2022 , 15 (13) . |
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Abstract ：
本工作开展了钢网片-聚乙烯(PE)纤维增强水泥基复合材料的中低速动态拉伸性能试验研究，研究了其破坏状态、强度特性和能量吸收特性，并研究了纤维体积含量、钢网片层数和拉伸速率对其动态拉伸性能的影响。试验结果表明：PE纤维和钢网片的添加提高了水泥基复合材料的抗拉强度、变形能力与耗能能力。相对于基体材料，钢网片-PE纤维水泥基复合材料具有较为显著的增强和增韧效应。钢网片的主要作用是提高材料的抗拉强度，PE纤维的主要作用是提高材料的变形能力和耗能能力。纤维体积含量、钢网片层数和拉伸速率均对钢网片-PE纤维水泥基复合材料的动态拉伸性能有一定程度的影响。随着PE纤维体积含量的增加，材料的抗拉强度和耗能能力逐...
Keyword ：
动态拉伸性能 动态拉伸性能 钢网片 钢网片 聚乙烯纤维 聚乙烯纤维 耗能能力 耗能能力 水泥基复合材料 水泥基复合材料
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| GB/T 7714 | 李亮 , 栾贻恒 , 吴俊 et al. 钢网片-聚乙烯纤维增强水泥基复合材料中低速动态拉伸性能试验研究 [J]. | 材料导报 , 2022 , 36 (05) : 53-58 . |
| MLA | 李亮 et al. "钢网片-聚乙烯纤维增强水泥基复合材料中低速动态拉伸性能试验研究" . | 材料导报 36 . 05 (2022) : 53-58 . |
| APA | 李亮 , 栾贻恒 , 吴俊 , 杜修力 , 吴文杰 . 钢网片-聚乙烯纤维增强水泥基复合材料中低速动态拉伸性能试验研究 . | 材料导报 , 2022 , 36 (05) , 53-58 . |
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Abstract ：
A finite element-thin layer element coupling method for the near-field wave propagation analysis in the fluid saturated porous media (FSPM) is developed based on the Biot u -U dynamic formulation. The case of the wave propagation normal to the boundary of calculating domain is investigated. The wave propagation equations are decoupled by the variables-separating method. The finite element method is adopted for the space discretization and numerical analysis of the finite domain, and the thin layer element method is applied to discretize the infinite domain and construct the consistent artificial boundary condition. This method is validated and then applied to the analysis to the near-field wave propagation problem of FSPM. Parametric sensitivity studies are conducted to analyze the effect of the mechanical parameters, including permeability coefficient, porosity, and Young's modulus of solid skeleton, on the dynamic response of FSPM. The study results indicate the effectiveness and efficiency of the developed method to the near-field wave propagation analysis in FSPM.
Keyword ：
Finite element method Finite element method Fluid-saturated porous media Fluid-saturated porous media Thin layer element method Thin layer element method Variables-separating method Variables-separating method Consistent artificial boundary condition Consistent artificial boundary condition Near-field wave propagation Near-field wave propagation
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| GB/T 7714 | Jiao, Hongyun , Li, Liang , Du, Xiuli et al. A finite element-thin layer element coupling method for near-field wave propagation in fluid-saturated porous media based on u-U dynamic formulation [J]. | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2022 , 158 . |
| MLA | Jiao, Hongyun et al. "A finite element-thin layer element coupling method for near-field wave propagation in fluid-saturated porous media based on u-U dynamic formulation" . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING 158 (2022) . |
| APA | Jiao, Hongyun , Li, Liang , Du, Xiuli , Shi, Peixin , Wang, Man . A finite element-thin layer element coupling method for near-field wave propagation in fluid-saturated porous media based on u-U dynamic formulation . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2022 , 158 . |
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