期刊：
Materials and Design,2011年32(4):2149-2156 ISSN：0261-3069
通讯作者：
Xiao, Y.-P.(xiaoyanping204@hotmail.com)
作者机构：
[Liu, Xiao-Yan; Li, Wen-Bin; He, Yun-Bin; Xiao, Yan-Ping; Pan, Qing-Lin] School of Materials Science and Engineering, Central South University, Changsha 410083, China;[Li, Wen-Bin] School of Civil Engineering, Hunan City University, Yiyang 413000, China;[Pan, Qing-Lin] Key Laboratory of Nonferrous Materials Science and Engineering of Ministry of Education, Changsha 410083, China
通讯机构：
[Xiao, Yan-Ping] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China.
关键词：
Al-Zn-Mg-Cu alloy - Corrosion behaviour - E. Corrosion - Exfoliation corrosion - F. Microstructure - Grain boundary precipitate - Intergranular corrosion - Loss of strength - Nonferrous metals and alloys - Optical microscopes - Retrogression and reaging - Transmission electron microscope
摘要：
Influence of retrogression and re-aging treatment on the microstructure, strength, exfoliation corrosion, inter-granular corrosion and stress corrosion cracking of an Al-Zn-Mg-Cu alloy has been investigated by means of optical microscope (OM), transmission electron microscope (TEM) and electrochemical impedance spectroscopy (EIS). The results show that retrogression and re-aging treatment can increase the size and the distribution discontinuity of the grain boundary precipitates, and lead to the increase of the corrosion resistance without the loss of strength and ductility. In addition, the analysis of electrochemical impedance spectroscopy shows that retrogression and re-aging treatment can enhance the resistance to exfoliation corrosion. Crown Copyright (C) 2010 Published by Elsevier Ltd. All rights reserved.
作者：
Li Wenbin;Pan Qinglin;Xiao Yanping;He Yunbin;Liu Xiaoyan
期刊：
Transactions of Nonferrous Metals Society of China,2011年21(10):2127-2133 ISSN：1003-6326
通讯作者：
Pan, Q.-L.(pql@mail.csu.edu.cn)
作者机构：
[Xiao Yanping; Li Wenbin; Liu Xiaoyan; He Yunbin; Pan Qinglin] School of Materials Science and Engineering, Central South University, Changsha 410083, China;[Li Wenbin] School of Civil Engineering, Hunan City University, Yiyang 413000, China
通讯机构：
[Pan Qing-lin] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China.
摘要：
The microstructural evolution and composition distribution of an Al-Zn-Cu-Mg-Sc-Zr alloy during homogenization were investigated by optical microscopy(OM),scanning electron microscopy(SEM),energy dispersive spectrometry(EDS),X-ray diffraction(XRD) and differential scanning calorimetry(DSC).The results show that severe dendritic segregation exists in Al-Zn-Cu-Mg-Sc-Zr alloy ingot.There are a lot of eutectic phases at grain boundary and the distribution of the main elements varies periodically along interdendritic region.The main eutectic phases at grain boundary are Al7Cu2Fe phase and T(Al2Mg3Zn3).The residual phases are dissolved into the matrix gradually during homogenization with increasing temperature and prolonging holding time,which can be described by a constitutive equation in exponential function.The overburnt temperature of the alloy is 473.9 ℃.The optimum parameters of homogenization are 470 ℃ and 24 h,which is consistent with the result of homogenization kinetic analysis.
作者机构：
[Long, Q.; Zhang, J. -F.; Zhou, Z. -M.] School of Civil Engineering, Hunan City University, Yiyang, Hunan, 413000, China
通讯机构：
[Zhang, J. -F.] Hunan City Univ, Sch Civil Engn, Yiyang 413000, Hunan, Peoples R China.;School of Civil Engineering, Hunan City University, Yiyang, Hunan, 413000, China
关键词：
Multi-objective model;Traffic management strategy;Intersection signal controlling;Fuzzy analytic process;Q-learning algorithm
摘要：
Traffic signals are one of the main traffic management tools used to control traffic flow on the roads and should reflect traffic managers' intentions in different tasks. This paper showed a multi-objective optimization model, and its algorithm was aimed at the intricate structure of traffic control. First, the indexes of queuing lengths, delay times, and stop times were chosen as the evaluation indexes of optimization model. Second, the weight of the optimization indexes was confirmed with a fuzzy analytic process (FAP) according to the traffic managers' strategy. Finally, the multi-objective optimization model was solved with the Q-learning algorithm, and thus the signal control scheme of the intersection was produced in real-time while considering the traffic management strategy. The results of the simulation showed that the method could effectively improve traffic efficiency at the intersection, and at the same time, the intentions of the traffic managers could be fully embodied.
作者：
Ting Du 杜婷#&#&#Weihong Wang;Zhongxin Liu;Huaili Lin;Taiping Guo
期刊：
Journal of Wuhan University of Technology(Materials Science Edition),2010年25(5):862-865 ISSN：1000-2413
通讯作者：
Du, T.(duting@mail.hust.edu.cn)
作者机构：
[Huaili Lin; Zhongxin Liu] Commercial Concrete Company of No.3 Construction Bureau of China, Wuhan 430070, China;[Taiping Guo; Wang, Weihong; Ting Du 杜婷#&#&#Weihong Wang] School of Civil Engineering, Hunan City College, Yiyang 413000, China;[Ting Du 杜婷#&#&#Weihong Wang] School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China
摘要：
The mechanical performance of recycled aggregate concrete (RAC) is investigated. An experiment on the complete stress-strain curve under uniaxial compression loading of RAC is carried out. The experimental results indicate that the peak stress, peak strain, secant modulus of the peak point and original point increase with the strength grade of RAC enhanced. On the contrary, the residual stress of RAC decreases with the strength grade enhancing, and the failure of RAC is often broken at the interface between the recycled aggregate and the mortar matrix. Finally, the constitutive model of stress-strain model of RAC has been constituted, and the results from the constitutive model of stress-strain meet the experiment results very well.
作者：
Li Xi-bing;Hong Liang;Yin Tu-bing;Zhou Zi-long;Ye Zhou-yuan
期刊：
Journal of Central South University of Technology,2008年15(2):218-223 ISSN：1005-9784
通讯作者：
Li, XB
作者机构：
[Zhou Zi-long; Ye Zhou-yuan; Yin Tu-bing; Li Xi-bing; Hong Liang] School of Resources and Safety Engineering, Central South University, Changsha 410083, China;[Hong Liang] Department of Civil Engineering, Hunan City University, Yiyang 413000, China
通讯机构：
[Li Xi-bing] Cent S Univ, Sch Resources & Safety Engn, Changsha 410083, Peoples R China.
关键词：
rock failure;Hopkinson pressure bar;diameter;minimum loading rate;medium strain rate
作者：
Hong Liang;Zhou Zi-long;Yin Tu-bing;Liao Guo-yan;Ye Zhou-yuan
期刊：
Journal of Central South University of Technology,2009年16(4):677-682 ISSN：1005-9784
通讯作者：
Hong, L
作者机构：
[Zhou Zi-long; Ye Zhou-yuan; Liao Guo-yan; Yin Tu-bing; Hong Liang] School of Resources and Safety Engineering, Central South University, Changsha 410083, China;[Hong Liang] Department of Civil Engineering, Hunan City University, Yiyang 413000, China
通讯机构：
[Hong Liang] Cent S Univ, Sch Resources & Safety Engn, Changsha 410083, Peoples R China.
期刊：
Journal of Central South University,2012年19(4):1148-1154 ISSN：1005-9784
通讯作者：
Li, Y.(liyunliuji@163.com)
作者机构：
[Liu, Ji] School of Civil Engineering and Mechanics, Central South University of Forestry and Technology, Changsha 410004, China;[Li, Yun; Liu, Ji] College of Civil Engineering, Hunan City University, Yiyang 413000, China
通讯机构：
[Li Yun] Hunan City Univ, Coll Civil Engn, Yiyang 413000, Peoples R China.
摘要：
The response surface method (RSM) is one of the main approaches for analyzing reliability problems with implicit performance functions. An improved adaptive RSM based on uniform design (UD) and double weighted regression (DWR) was presented. In the proposed method, the basic principle of the iteratively adaptive response surface method is applied. Uniform design is used to sample the fitting points. And a double weighted regression system considering the distances from the fitting points to the limit state surface and to the estimated design points is set to determine the coefficients of the response surface model. Compared with the conventional approaches, the fitting points selected by UD are more representative, and a better approximation in the key region is also observed with DWR. Numerical examples show that the proposed method has good convergent capability and computational accuracy.
期刊：
Journal of Central South University of Technology,2011年18(4):1139-1143 ISSN：1005-9784
通讯作者：
Zhou, Z.-L.(zlzhou@mail.csu.edu.cn)
作者机构：
[Li, Qi-Yue; Liu, Zhi-Xiang; Zhou, Zi-Long] School of Resources and Safety Engineering, Central South University, Changsha 410083, China;[Hong, Liang] Department of Civil Engineering, Hunan City University, Yiyang 413000, China
通讯机构：
[Zhou Zi-long] Cent S Univ, Sch Resources & Safety Engn, Changsha 410083, Hunan, Peoples R China.
关键词：
Calibration factors - Impact velocities - Linear relation - Measurement calibration - Misalignment impact - Peak values - Special shape striker - Split Hopkinson pressure bars - Stress history - System calibration - Wave characteristics - Wave dispersion - Wave distortion - Wave forms
摘要：
In order to present basic guidance for system calibration of split Hopkinson pressure bar (SHPB) with the special shape striker, wave characteristics and dynamic responses of SHPB under striker impact were analyzed. Stress generated by the special shape striker tends to have a half-sine waveform and has little wave dispersion during its propagation. Impact velocities of the special shape striker and peak values of generated stress still have linear relation but with a different coefficient from that of cylindrical strikers. From stress histories on the surfaces of the input bar impacted by the special shape striker off-axially and obliquely, it is found that the misalignment impacts usually trigger wave distortion and amplitude decrease, which can be used to identify the poor system adjustment. Finally, the system calibration of SHPB with the special shape striker can be classified into four steps: system adjustment, wave distortion identification, measurement calibration and transmission calibration, where the measurement calibration factor and transmission calibration factor are elaborated and redefined.
作者：
Wenbin Li;Qinglin Pan;Liang Zou;Wenjie Liang;Yunbin He;Junsheng Liu
期刊：
Rare Metals,2009年28(1):102-106 ISSN：1001-0521
通讯作者：
Li, W.(liwenbin.1963@163.com)
作者机构：
[Wenbin Li; Wenjie Liang; Junsheng Liu; Qinglin Pan; Liang Zou; Yunbin He] School of Materials Science and Engineering, Central South University, Changsha 410083, China;[Wenbin Li] Department of Civil Engineering, Hunan City University, Yiyang 413000, China
通讯机构：
[Li Wenbin] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China.
摘要：
Five kinds of Al-Zn-Mg-Cu-Zr based alloys with different Sc additions were prepared by ingot metallurgy. The effects of minor Sc on the microstructure and mechanical properties of Al-Zn-Mg-Cu-Zr based alloys were investigated using tensile tests, optical microscopy (OM), and transmission electron microscopy (TEM). The results show that the ultimate tensile strength and yield strength are improved by 94 and 110 MPa, respectively, and the elongation to failure remains at a reasonable extent (11.1%) in the Al-Zn-Mg-Cu-Zr based alloy with 0.21 wt.% Sc addition after solution heat treatment at 475℃ for 40 min and then aged at 120℃ for 24 h. The addition of minor Sc induces the formation of Al_3(Sc,Zr) particles, which are highly effective in refining the cast microstructures, retarding recrystallization, and pinning dislocations. The increment of strength is attributed mainly to fine grain strengthening, precipitation strengthening of Al_3(Sc,Zr) particles, and substructure strengthening.
作者：
Xiao, Y. P.;Pan, Q. L.;Li, W. B.;Liu, X. Y.;He, Y. B.
期刊：
Materials and Corrosion,2012年63(5):421-430 ISSN：1521-4176
通讯作者：
Xiao, YP
作者机构：
[Pan, Q. L.; Liu, X. Y.; Li, W. B.; He, Y. B.; Xiao, Y. P.] School of Materials Science and Engineering, Central South University, Changsha 410083, China;[Li, W. B.] School of Civil Engineering, Hunan City University, Yiyang 413000, China;[Pan, Q. L.] Key Laboratory of Nonferrous Materials Science and Engineering, Ministry of Education, Changsha 410083, China
通讯机构：
[Xiao, Y. P.] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China.
摘要：
Corrosion behaviour of different tempers (namely NA, UA, PA and OA) of AlZnMgCuZrSc alloy was studied by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), optical microscopy (OM) and transmission electron microscopy (TEM). Over aged (OA) can decrease the susceptibility to exfoliation due to the discontinuous distribution of the η precipitates at the grain boundaries, cause a negative shift of the corrosion potential (Ecorr), and lead to the prolonging of the time of the appearance of two time constants in impedance diagrams. In addition, AlZnMgCuZrSc alloy with over aged treatment has an enhanced resistance to exfoliation corrosion.
作者：
Liu Xi-ling;Li Xi-bing;Hong Liang;Yin Tu-bing;Rao Meng
期刊：
Journal of Central South University,2015年22(9):3571-3577 ISSN：2095-2899
通讯作者：
Liu, XL
作者机构：
[Hong Liang] School of Civil Engineering, Hunan City University, Yiyang, China;[Liu Xi-ling; Yin Tu-bing; Rao Meng; Li Xi-bing] School of Resources and Safety Engineering, Central South University, Changsha, China;[Liu Xi-ling] Norman B. Keevil Institute of Mining Engineering, University of British Columbia, Vancouver, Canada
通讯机构：
[Liu Xi-ling] Cent S Univ, Sch Resources & Safety Engn, Changsha 410083, Peoples R China.
摘要：
Acoustic emission tests were performed using a split Hopkinson pressure bar system (SHPB) on 50-mm-diameter bars of granite, limestone, sandstone and skarn. The results show that the amplitude distribution of hits is not well centralized around 50 dB, and that some hits with large amplitudes, usually larger than 70 dB, occur in the early stages of each test, which is different from the findings from static and low-loading-rate tests. Furthermore, the dominant frequency range of the recorded acoustic emission waveforms is between 300 kHz and 500 kHz, and frequency components higher than 500 kHz are not significant. The hit with the largest values of amplitude, counts, signal strength, and absolute energy in each test, displays a waveform with similar frequency characteristics and greater correlation with the waveform obtained from the elastic input bar of the split Hopkinson pressure bar system compared with the waveforms of the other hits. This indicates that the hit with the largest values of amplitude, counts, signal strength, and absolute energy is generated by elastic wave propagation instead of fracture within the rock specimen.
期刊：
Journal of Central South University of Technology,2011年18(2):279-284 ISSN：1005-9784
通讯作者：
Pan, Q.-L.(pql@mail.csu.edu.cn)
作者机构：
[Xiao, Yan-Ping; Li, Wen-Bin; Liu, Xiao-Yan; He, Yun-Bin; Pan, Qing-Lin] School of Materials Science and Engineering, Central South University, Changsha 410083, China;[Li, Wen-Bin] School of Civil Engineering, Hunan City University, Yiyang 413000, China
通讯机构：
[Pan Qing-lin] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China.
关键词：
Aging conditions - Aging parameter - Al-Zn-Cu-Mg-Sc-Zr alloy - Conductivity measurements - GP zones - Hardness test - matrix - Microstructure and mechanical properties - Properties and microstructures - Retrogression and reaging - Retrogression time - T6 temper - TEM - Tensile tests
摘要：
The mechanical properties and stress corrosion cracking (SCC) resistance of an Al-Zn-Cu-Mg-Sc-Zr alloy under different aging conditions were investigated. The dependence of microstructure and mechanical properties on aging parameters was evaluated by tensile test, hardness test and conductivity measurement. The results show that for the alloys with retrogression and re-aging treatment (RRA), the conductivity increases with the retrogression time and temperature, while the tensile strength decreases. The transmission electron microscopy (TEM) results show that the precipitates η(MgZn2) at grain boundary aggregate apparently with retrogression time and the precipitates inside the matrix exhibit the similar distribution to T6 temper, which comprises fine GP zones, large η′(MgZn2) and η(MgZn2) phases. According to the mechanical properties and microstructure observations, the optimal RRA regime is recommended to be 120 °C, 24 h + 180 °C, 30 min + 120 °C, 24 h. The strength level of the alloy after the optimum RRA treatment is similar to that in T6 condition and the SCC resistance is improved obviously in contrast to T6 condition.
摘要：
A novel electrochemical sensor for nonenzymatic hydrogen peroxide (H2O2) detecting based on facile synthesis of copper oxide (CuO) nanoparticles dopping into graphene sheets@cerium oxide nanocomposites sensitized screen printed electrode (SPE) was fabricated. CuO nanoparticles were dopped into GS@CeO2 nanocomposites via a facile solvothermal process. X-ray powder diffractometer (XRD) combines with fourier transform infrared spectroscopy (FTIR) were used to characterize the composition of GS@CeO2-CuO nanocomposites. Electrochemical impedance spectroscopy (EIS) was utilized to study the interfacial properties as well as scanning electron microscopy (SEM) was employed to characterize the morphologies of different electrodes. The electrochemical properties of electrochemical sensor were investigated by cyclic voltammetry (CV) and chronoamperometry (i-t curve) methods. After all experimental parameters were optimized, the GS@CeO2-CuO hybrid nanomaterials modified SPE (SPE I GS@CeO2-CuO) showed a good performance towards the electrocatalytic reduction of H2O2. A wide linear detection range (LDR) of CV peaks from 5.0x 10(-3) mM to 18.0 mM (R=0.9994) and a low limit of detection (LOD) of 2.1 x 10(-3) mM (S/N=3) was achieved. The proposed electrochemical sensor was quick, selective, sensitive, simple, stable and reliable to quantitative determination of trace H2O2 in real samples.
期刊：
Materials and Corrosion,2012年63(2):127-133 ISSN：1521-4176
通讯作者：
Xiao, Y.P.(xiaoyanping204@hotmail.com)
作者机构：
[Pan, Q.L.; Li, C.L.; Liu, X.Y.; He, Y.B.; Li, W.B.; Xiao, Y.P.] School of Materials Science and Engineering, Central South University, Changsha 410083, China;[Li, W.B.] School of Civil Engineering, Hunan City University, Yiyang 413000, China;[Pan, Q.L.] Key Laboratory of Nonferrous Materials Science and Engineering, Ministry of Education, Changsha 410083, China
通讯机构：
[Xiao, Y. P.] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China.
摘要：
The exfoliation corrosion behavior of an Al–Zn–Mg–Cu–Zr alloy containing Sc artificially aged at 120 °C for 24 h is studied by macroscopic observation techniques and electrochemical impedance spectroscopy (EIS) measurements. After 48 h immersion, the blisters start bursting and delamination initiates, along with the appearance of two time constants in the impedance diagrams. According to the simulation by equivalent circuit, the corrosion rate decreases sharply and then reaches a steady state, which is due to the change of the solution pH and oxide layer thickness, as well as the accumulation of corrosion products.
期刊：
Tunnelling and Underground Space Technology,2018年72:210-217 ISSN：0886-7798
通讯作者：
Yang, Xian(yangxjj@163.com)
作者机构：
[Yang, Xian] School of Resource, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, Hunan, 411201, China;[Yang, Xian] Key laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environmental Monitoring (Central South University), Ministry of Education, Changsha, Hunan, 410012, China;[Li, Yongsuo] School of Civil Engineering, Hunan University of City, Yiyang, Hunan, 413000, China
摘要：
Cast-in-place concrete large-diameter pipe pile (referred to as PCC pile) is widely used for pile-supported embankment over soft soils in China. However, the studies focused on the sliding stability and calculated method of this new pile type under lateral load was relatively little. Therefore, base on PCC pile-supported embankments in the eastern coastal region of China case study, undrained shear strength, conventional p-y criteria, and modified pile modulus are recommended for lateral bearing capacity calculation basing on LPILE plus 5.0. The correctness of calculated method is verified by comparing the results on lateral load versus pile top deflection with those obtained by field test. The performances of drilled shaft with the same out-diameter, and PCC pile without considering pile core soils are also carried out for comparative analysis. The result shows that the performances of PCC piles under lateral load can be calculated through LPILE software with conventional p-y criteria of drilled shaft, and modified modulus of piles. The result also shows that when comparing with conventional drilled shaft with the same out-diameter, the lateral bearing capacity of PCC pile is reduced nearly about 20 %, while with nearly about 60 % concrete usage are saved. The results of this paper can provide design and calculation guide for practical PCC pile used for landslide disaster treatment under lateral load in United States.
期刊：
International Journal of Heat and Mass Transfer,2018年126:1094-1103 ISSN：0017-9310
通讯作者：
Li, X.-F.(xfli@csu.edu.cn)
作者机构：
[Zhang, X.-Y.; Xie, Y.-J.; Li, X.-F.; Peng, Y.] School of Civil Engineering, Central South University, Changsha, 410075, China;[Li, X.-F.] State Key Laboratory for Powder Metallurgy, Central South University, Changsha, 410083, China;[Peng, Y.] School of Civil Engineering, Hunan City University, Yiyang, 413000, China
通讯机构：
[Li, X. -F.] Cent S Univ, Sch Civil Engn, Changsha 410075, Hunan, Peoples R China.
摘要：
The classical theory of heat conduction (Fourier theory) predicts an infinite speed for thermal disturbance propagation, which is physically unrealistic. By extending the classical Fourier heat conduction and Fick's diffusion, this paper presents a hyperbolic diffusion law with different phase lags of thermal and moisture fluxes to simulate coupled heat-moisture diffusion-propagation behavior. Transient hygrothermal and elastic response of an infinitely long cylinder subjected to sudden hygrothermal loadings at the surface is studied. By using Laplace transform and decoupling technique, a closed form solution of temperature, moisture, displacements and stresses is determined. The analytical results show that the thermal and moisture relaxation times or phase lags of heat and moisture fluxes play a significant role in the early stage of transient response after heat/moisture shock. The classical results corresponding to vanishing phase lags can be recovered from the present ones. For non-vanishing phase lags, hygrothermal waves have finite propagation speeds. Numerical results are calculated and displayed graphically to show the influence of the phase lags of heat and moisture fluxes on transient hygrothermoelastic fields. A comparison between classic model and hyperbolic hygrothermal coupling model is given. Based on the non Fourier heat conduction and non-Fick diffusion, some shortcomings induced by the classical Fourier's and Fick's laws can be effectively avoided. (C) 2018 Elsevier Ltd. All rights reserved.
期刊：
Journal of Central South University,2016年23(2):470-478 ISSN：2095-2899
通讯作者：
Cao, Guo-hui(cgfcivil@163.com)
作者机构：
[Zhang, Kai; Cao, Guo-hui] College of Civil Engineering, Hunan City University, Yiyang, China;[Hu, Jia-xing] College of Civil Engineering, Hunan University, Changsha, China
通讯机构：
[Cao Guo-hui] Hunan City Univ, Coll Civil Engn, Yiyang 413000, Peoples R China.
关键词：
prestress;relaxation loss;shrinkage and creep;theoretical analysis;calculation model
摘要：
The calculation model for the relaxation loss of concrete mentioned in the Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts (JTG D62—2004) was modified according to experimental data. Time-varying relaxation loss was considered in the new model. Moreover, prestressed reinforcement with varying lengths (caused by the shrinkage and creep of concrete) might influence the final values and the time-varying function of the forecast relaxation loss. Hence, the effects of concrete shrinkage and creep were considered when calculating prestress loss, which reflected the coupling relation between these effects and relaxation loss in concrete. Hence, the forecast relaxation loss of prestressed reinforcement under the effects of different initial stress levels at any time point can be calculated using the modified model. To simplify the calculation, the integral expression of the model can be changed into an algebraic equation. The accuracy of the result is related to the division of the periods within the ending time of deriving the final value of the relaxation loss of prestressed reinforcement. When the time division is reasonable, result accuracy is high. The modified model works excellently according to the comparison of the test results. The calculation result of the modified model mainly reflects the prestress loss values of prestressed reinforcement at each time point, which confirms that adopting the finding in practical applications is reasonable.
作者：
Li Wen-bin;Pan Qing-lin;Liu Jun-sheng;Liang Wen-jie;He Yun-bin;Liu Xiao-yan
期刊：
Journal of Central South University of Technology,2009年16(4):530-534 ISSN：1005-9784
通讯作者：
Pan, QL
作者机构：
[Li Wen-bin] Department of Civil Engineering, Hunan City University, Yiyang 413000, China;[Liu Jun-sheng; Li Wen-bin; Liang Wen-jie; Liu Xiao-yan; He Yun-bin; Pan Qing-lin] School of Materials Science and Engineering, Central South University, Changsha 410083, China
通讯机构：
[Pan Qing-lin] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China.
关键词：
Al-Zn-Cu-Mg-Sc-Zr alloy;hot deformation;flow softening;microstructural evolution;activation energy
摘要：
Due to the complexity of components and damage mechanism of reinforced concrete, the wave propagation characteristics in reinforced concrete are always complicated and difficult to determine. The objective of this article is to study the failure process of reinforced concrete structure under the damage caused by pencil-broken. A new method on the basis of the acoustic emission technique and the Hilbert-Huang transform theory is proposed in this work. By using acoustic emission technique, the acoustic emission wave signal is generating while the real-time damage information and the strain field of the reinforced concrete structure is receiving simultaneously. Based on the Hilbert-Huang transform (HHT) theory, the peak frequency characteristics of the acoustic emission signals were extracted to identify the damage modes of the reinforced concrete structure. The results demonstrate that this method can quantitatively investigate the acoustic emission wave propagation characteristic in reinforced concrete structures and might also be promising in other civil constructions. (C) 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license.
