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学者姓名：李亮
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摘要 ：
In the current study, a Short-Term Thermal Creep Strain (STTCS) model of concrete was innovatively developed. This model can predict the time-dependent deformation of concrete subjected to wide applied load level ranging from 20 % to 60 % and temperatures up to 900 degrees C. A creep compliance function was developed to study the nonlinear creep characteristics of concrete with creep parameters. The definition and sensitivity of the creep parameters were investigated. 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 influence of STTCS on the multiaxial stress-strain behaviors was taken into account in the multiaxial model. The coupling thermo-mechanical contributions containing the development of STTCS with thermal effect, stress confinement, plastic damage and hardening evolution were creatively considered in the potential function within thermodynamics framework. The sensitivity of yield surface was discussed. The numerical operations of this proposed model were conducted for validation. The nonlinear stress-strain responses of concrete were accurately captured at temperatures ranging from 20 degrees C to 800 degrees C through the comparative study with test results in literatures, which indicates the accuracy and applicability of the proposed model.
关键词 ：
Thermo-mechanical damage model of concrete Thermo-mechanical damage model of concrete Creep compliance function Creep compliance function Multiaxial compression characterization Multiaxial compression characterization Time-dependent deformation Time-dependent deformation Short-Term Thermal Creep Strain Short-Term Thermal Creep Strain
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| GB/T 7714 | Wang, Hongwei , Li, Liang , Du, Xiuli . A 3D thermo-mechanical damage model for concrete including Short-Term Thermal Creep Strain (STTCS) [J]. | JOURNAL OF BUILDING ENGINEERING , 2024 , 95 . |
| MLA | Wang, Hongwei 等. "A 3D thermo-mechanical damage model for concrete including Short-Term Thermal Creep Strain (STTCS)" . | JOURNAL OF BUILDING ENGINEERING 95 (2024) . |
| APA | Wang, Hongwei , Li, Liang , Du, Xiuli . A 3D thermo-mechanical damage model for concrete including Short-Term Thermal Creep Strain (STTCS) . | JOURNAL OF BUILDING ENGINEERING , 2024 , 95 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
In the current study, a multiaxial multiscale compressive stress-strain model for Fiber Reinforced Cementitious Composites (FRCC) was innovatively developed. The proposed model was on the basis of the theory of thermodynamics, multiscale theory and internal variable theory. The free energy function and dissipation function were established to characterize the elastic and plastic deformation of FRCC, respectively. The multiscale behaviors of FRCC in meso-scale and macroscale was taken into account. In meso-scale, the energy dissipation functions of fiber in tension and bond-slip deformation in the interface transition zone (ITZ) were established. The resistance to cracking of cementitious matrix through the fiber bond stress were taken into account. In macro-scale, the thermo-mechanical coupling contributions of plastic damage, thermal damage, yield surface and hardening evolution were creatively considered in the potential function within thermodynamics framework. The influence of types and volume fractions of fibers on the reinforcement mechanism was discussed. When the temperature is higher than the melting point of fiber, the fiber influence coefficients was employed. The sensitivity of yield surface was discussed. The numerical predictions of this developed model were carried out for validation. The nonlinear stress-strain responses of concrete were accurately captured at temperatures ranges from 20 degrees C to 800 degrees C compared with the experimental data, which indicates the accuracy and applicability of the proposed model.
关键词 ：
Compressive stress-strain relationship Compressive stress-strain relationship Elevated temperature Elevated temperature Fiber reinforced cementitious composites Fiber reinforced cementitious composites Damage model Damage model Multiscale characteristics Multiscale characteristics
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| GB/T 7714 | Wang, Hongwei , Li, Liang , Du, Xiuli . A multiaxial multiscale compressive thermo-mechanical damage model for Fiber Reinforced Cementitious Composites (FRCC) [J]. | JOURNAL OF BUILDING ENGINEERING , 2024 , 94 . |
| MLA | Wang, Hongwei 等. "A multiaxial multiscale compressive thermo-mechanical damage model for Fiber Reinforced Cementitious Composites (FRCC)" . | JOURNAL OF BUILDING ENGINEERING 94 (2024) . |
| APA | Wang, Hongwei , Li, Liang , Du, Xiuli . A multiaxial multiscale compressive thermo-mechanical damage model for Fiber Reinforced Cementitious Composites (FRCC) . | JOURNAL OF BUILDING ENGINEERING , 2024 , 94 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
This paper aims to develop a multiscale thermo-mechanical coupling model across from meso-scale to macroscale to study the tensile thermos-mechanical behavior of fiber-reinforced cementitious composite (FRCC) on the base of thermodynamics. In meso-scale, the coupling process of thermal effect and the development law of a single crack were creatively presented and formulated in energy potential function. The effects of fiber dispersion on cracking behavior and crack strength of matrix were determined. In macro-scale, the multiple -fine -cracks and strain-hardening/softening behavior under tension were defined and studied. The bridging action stress of fibers is calculated by considering the bonding stress in the interface transition zone (ITZ). The model can be upgraded for FRCC materials ranges from strain-hardening cementitious composite (SHCC) and engineered cementitious composite (ECC). The numerical calculations of the proposed model were conducted based on the Fortran program for validation. The residual tensile strength, multiple -fine -cracks and strain-hardening/softening behaviors of FRCC were predicted. The behaviors of FRCC with different fiber types were accurately captured in a range of temperature from 20 degrees C to 600 degrees C through the comparative study with six groups test results in literatures. A sensibility study was carried out to analyze the impact of modelling parameters and thermal effect on the strain-hardening/softening behaviors of FRCC.
关键词 ：
Thermo-mechanical coupling model Thermo-mechanical coupling model Fiber-reinforced cementitious composite Fiber-reinforced cementitious composite Elevated temperature Elevated temperature Multiscale characterization Multiscale characterization Tensile behavior Tensile behavior
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| GB/T 7714 | Wang, Hongwei , Li, Liang , Du, Xiuli . A multiscale thermo-mechanical coupling model for Fiber-Reinforced Cementitious Composite (FRCC) [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 425 . |
| MLA | Wang, Hongwei 等. "A multiscale thermo-mechanical coupling model for Fiber-Reinforced Cementitious Composite (FRCC)" . | CONSTRUCTION AND BUILDING MATERIALS 425 (2024) . |
| APA | Wang, Hongwei , Li, Liang , Du, Xiuli . A multiscale thermo-mechanical coupling model for Fiber-Reinforced Cementitious Composite (FRCC) . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 425 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
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.
关键词 ：
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 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
In the current study, a coupled thermo-mechanical constitutive model of concrete was newly developed to characterize the mechanical responses of concrete at different temperatures within thermodynamics framework. The coupling thermo-mechanical contributions among thermal effect (up to 800 degrees C), damage evolution and thermo-plastic hardening were creatively taken into account in energy potential function. The thermal damage evolution law and load induced plastic mechanical damage evolution law was developed respectively and were coupled in the dissipation function. The thermo-mechanical hardening rule was considered through adopting back stress and hardening parameters. A particular advantage of the proposed model is that fiber influence coefficients can be employed in potential functions to upgrade for modeling fiber reinforced concrete. The impact of types and volume fractions of fibers on the reinforcement mechanism was calculated in the fiber influence coefficients. Besides, an orthotropic triaxial compression model was developed for concrete and fiber reinforced concrete to predict multiaxial stress behavior at high temperature. The proposed model was coded and implemented into the Fortran program and the nonlinear behaviors of concrete and fiber reinforced concrete were predicted. Good effectiveness and accuracy have been validated through comparing the modelling results and six groups experimental results in literatures, which illustrates that the proposed model is robust and reliable. Finally, a discussed study was conducted to investigate the effect of hardening parameters and thermal effect on the yield surface.
关键词 ：
Thermo-mechanical nonlinear deformation Thermo-mechanical nonlinear deformation Fiber reinforced concrete Fiber reinforced concrete Constitutive model of concrete Constitutive model of concrete Damage evolution Damage evolution Elevated temperature Elevated temperature
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| GB/T 7714 | Wang, Hongwei , Li, Liang , Du, Xiuli . A thermo-mechanical coupling model for concrete including damage evolution [J]. | INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES , 2023 , 263 . |
| MLA | Wang, Hongwei et al. "A thermo-mechanical coupling model for concrete including damage evolution" . | INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES 263 (2023) . |
| APA | Wang, Hongwei , Li, Liang , Du, Xiuli . A thermo-mechanical coupling model for concrete including damage evolution . | INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES , 2023 , 263 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
This short communication proposed a dynamic constitutive model, which investigated the com-bined effects of temperatures and strain rates to characterize the mechanical performance of concrete exposed to fire and blast simultaneously. Compared with the existing constitutive models, the proposed constitutive model is relatively simple with uniform series of parameters, and can be more easily applied to the numerical simulation of the dynamic behaviors of concrete. The elastic strain increment expression for concrete was derived from the elastic free energy function, and the plastic strain increment expression was based on the classical plastic theory. Based on Drucker-Prager yield criterion, the yield equation considering the strengthening effect of strain rate was established. The damage criterion was established to characterize the damage caused by various temperatures and strain rates. The stress-strain diagrams of concrete materials with different temperatures (200 degrees C, 400 degrees C, 600 degrees C, and 800 degrees C) and strain rates (50 s-1-185 s-1) were calculated under the condition of uniaxial dynamic compress and temperature loading. By comparing with the previous test results, it can be concluded that the current constitutive model accurately simulates the mechanical performance of concrete with various temperatures and various strain rates. It provided a theoretical basis for the safety evaluation of concrete engi-neering structures.
关键词 ：
Strain rate Strain rate Elastoplastic Elastoplastic Concrete Concrete Temperature Temperature Dynamic constitutive model Dynamic constitutive model
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| GB/T 7714 | Kou, Xinyu , Li, Liang , Du, Xiuli et al. Elastoplastic dynamic constitutive model of concrete with combined effects of temperature and strain rate [J]. | CASE STUDIES IN CONSTRUCTION MATERIALS , 2023 , 18 . |
| MLA | Kou, Xinyu et al. "Elastoplastic dynamic constitutive model of concrete with combined effects of temperature and strain rate" . | CASE STUDIES IN CONSTRUCTION MATERIALS 18 (2023) . |
| APA | Kou, Xinyu , Li, Liang , Du, Xiuli , Zheng, Xiyao . Elastoplastic dynamic constitutive model of concrete with combined effects of temperature and strain rate . | CASE STUDIES IN CONSTRUCTION MATERIALS , 2023 , 18 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
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.
关键词 ：
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 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
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.
关键词 ：
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) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
The mechanical behaviors of structure concrete can degrade significantly at high temperatures from fire. The mechanical performance of structure concrete may recover to some extent during the subsequent cooling process after fire. A comparative study on the dynamic performance of concrete between at high temperature and after cooling down is necessary to predict dynamic response of structures subjected to fire or blast loads more precisely. In this paper, the dynamic characteristics of Steel Fiber Reinforced Concrete (SFRC) after high temperature cooling were examined with the use of Split Hopkinson Pressure Bar (SHPB) and compared with the test results at high temperature. The dynamic compressive strength, dynamic increase factor (DIF) of stress and peak strain of SFRC with different fiber volume (0%,1%,2%) after natural cooling from different target temperatures (200 degrees C, 400 degrees C, 600 degrees C) to ambient temperature were obtained and compared. Experimental results show that the dynamic compressive strength and peak strain of the specimen first increases and then decreases with the increase of the strain rate cause the high temperature cooling process made the specimens prone to local failure at high strain rates. The mechanical properties of SFRC such as strength can be well recovered during the natural cooling process after high temperature. The deformation capacity and energy dissipation capacity of different types of concrete after high temperature cooling are greatly improved compared with that under high temperatures.
关键词 ：
Split Hopkinson pressure bar (SHPB) Split Hopkinson pressure bar (SHPB) Dynamic increase factor (DIF) Dynamic increase factor (DIF) Dynamic compressive properties Dynamic compressive properties Steel fiber reinforced concrete Steel fiber reinforced concrete Natural cooling after high temperature Natural cooling after high temperature
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| GB/T 7714 | Li, Liang , Wang, Zichen , Wu, Jun et al. Comparative study on the dynamic mechanical properties of steel fiber reinforced concrete at high temperatures and after high temperature cooling [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2022 , 346 . |
| MLA | Li, Liang et al. "Comparative study on the dynamic mechanical properties of steel fiber reinforced concrete at high temperatures and after high temperature cooling" . | CONSTRUCTION AND BUILDING MATERIALS 346 (2022) . |
| APA | Li, Liang , Wang, Zichen , Wu, Jun , Du, Xiuli , Wang, Hongwei , Liu, Wenli . Comparative study on the dynamic mechanical properties of steel fiber reinforced concrete at high temperatures and after high temperature cooling . | CONSTRUCTION AND BUILDING MATERIALS , 2022 , 346 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
The thermomechanical coupling constitutive model of concrete is a critical subject for the theoretical investigation and numerical simulation of the mechanical behaviors of concrete members and structures at high temperature. This paper presents a thermomechanical coupling constitutive model for the description of the mechanical behaviors of concrete at different temperatures. The expression of the elastic strain increment is derived with the free energy function including the temperature variable. The expression of the plastic strain increment is derived from the yield function based on the Drucker-Prager strength criterion. The elastoplastic damage effect is included in this constitutive model. The damage variable is included in the yield function to consider the effect of the damage on the elastoplastic mechanical behaviors of concrete. The proposed constitutive model is validated by the comparison of the simulation results of the uniaxial compression tests of concrete at different temperatures with the corresponding test results. The simulation results accord well with the test results at different temperatures. This indicates that the proposed constitutive model can characterize the mechanical behaviors of concrete at different temperatures with considerable accuracy. The proposed constitutive model was applied to simulate an axially compressive concrete column. The simulation results are consistent with the essential mechanical response behaviors of concrete members at different temperatures.
关键词 ：
concrete concrete thermomechanical coupling thermomechanical coupling thermodynamics thermodynamics constitutive model constitutive model elastoplastic damage elastoplastic damage
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| GB/T 7714 | Li, Liang , Wang, Hongwei , Wu, Jun et al. A Thermomechanical Coupling Constitutive Model of Concrete Including Elastoplastic Damage [J]. | APPLIED SCIENCES-BASEL , 2021 , 11 (2) . |
| MLA | Li, Liang et al. "A Thermomechanical Coupling Constitutive Model of Concrete Including Elastoplastic Damage" . | APPLIED SCIENCES-BASEL 11 . 2 (2021) . |
| APA | Li, Liang , Wang, Hongwei , Wu, Jun , Jiang, Wenhua . A Thermomechanical Coupling Constitutive Model of Concrete Including Elastoplastic Damage . | APPLIED SCIENCES-BASEL , 2021 , 11 (2) . |
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