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Concrete reinforced with macro fibres recycled from waste GFRP

CONSTRUCTION AND BUILDING MATERIALS 2021年 310卷 125063-125063页

作者： Fu, Bing Liu, K. C. Chen, J. F. Teng, J. G. Jinan Univ Sch Mech & Construct Engn Guangzhou 510632 Peoples R China Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Peoples R China Hong Kong Polytech Univ Dept Civil & Environm Engn Hong Kong Peoples R China Southern Univ Sci & Technol Dept Ocean Sci & Engn Shenzhen 518000 Peoples R China Southern Marine Sci & Engn Guangdong Lab Guangzhu Guangzhou 511458 Peoples R China

Fibre reinforced polymer (FRP) composites are widely used in many industries due to their excellent mechanical and durability properties. This means that an increasing amount of FRP waste, arising from production, processing and decommissioning, needs to be processed. Common FRP composites are normally thermoset and nonbiodegradable, posing a significant environmental threat if they are not disposed of properly at their end of life. While recycling of FRP is environmentally desirable, almost all existing recycling methods, which are based on either thermal, chemical or mechanical processes, are economically unviable if governmental subsides are not available. The recycling of glass FRP (GFRP) waste, which accounts for over 95% of all types of FRP waste by weight, is even more economically challenging than the recycling of carbon FRP (CFRP) waste due to the lesser economic value of the former. This paper explores a novel mechanical method for recycling GFRP waste by processing it into macro fibres for reinforcing concrete, with the resulting material referred to as macro fibre reinforced concrete (MFRC). The mechanical properties of MFRC were investigated. The test results showed that the addition of macro fibres had two major effects on the concrete: (1) the workability of concrete depends strongly on the macro fibre volume ratio, with the slump value reducing from 176 mm to 83 mm as the macro fibre volume ratio increased from 0% to 1.5%;(2) the flexural strength and toughness of the concrete be greatly enhanced by the addition of macro fibres, e.g., by 1.3 and 230 times when the macro fire value ratio was 1.5%. The proposed recycling method for waste GFRP is therefore believed to be both technically feasible and economically attractive.

关键词： GFRP Waste Mechanical recycling Macro fibre Concrete

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Sparse regularization for traffic load monitoring using bridge response measurements

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MEASUREMENT 2019年 131卷 173-182页

作者： Zhong, Jiwei Liu, Huanlin Yu, Ling Wuhan Univ Technol Wuhan 430070 Hubei Peoples R China Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China State Key Lab Hlth & Safety Bridge Struct Wuhan 430034 Hubei Peoples R China Jinan Univ Sch Mech & Construct Engn Guangzhou 510632 Guangdong Peoples R China

Traffic load monitoring (TLM) is one of important issues in bridge structural health monitoring (SHM), but there still exist such problems as lack of accuracy and efficiency for the existing methods. In this study, a sparse regularization approach is proposed for TLM based on analytical model and redundant dictionary. Firstly, an unknown moving traffic load is deemed as a combination of static and time-varying components so that a redundant dictionary can be established to independently express them. The static component is expressed by a basis vector whose elements are identical, and the time-varying one by wavelet functions for their good multi-resolution analysis characteristics. Then, the TLM problem is converted to determine a coefficient vector of dictionary, and the l(1)-norm regularization technique is adopted to obtain a sparse solution to the coefficient vector. Finally, a series of experimental studies on a hollow steel beam bridge under crossing a moving model car are conducted in laboratory to assess the effectiveness of the proposed method. Furthermore, comparative studies are carried out for assessing the effect of different measurement parameters, such as moving car speeds, car weights, strain and acceleration response data, redundant dictionaries as well as selection of regularization parameters, on the proposed method. The illustrated TLM results show that the dictionary used for TLM in this study can independently distinguish the static and time-varying components of moving traffic loads. The proposed method can effectively identify the total weight of moving traffic loads with a higher accuracy, which provides a great potential for monitoring moving vehicle loads on bridges.

关键词： Traffic load monitoring (TLM) Moving force identification (MFI) Redundant dictionary l(1)-Norm regularization Analytical model Wavelet functions

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Full-range mechanical behavior study of FRP-to-concrete interface for pull-pull bonded joints

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COMPOSITES PART B-engineering 2019年 164卷 333-344页

作者： Liu, Sanxing Yuan, Hong Wu, Jiayu Jinan Univ Inst Appl Mech MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China Jiaying Univ Sch Civil Engn Meizhou 514021 Peoples R China Southern Univ Sci & Technol Dept Ocean Sci & Engn Shenzhen 518055 Peoples R China

External bonding of fiber reinforced polymer (FRP) has become a popular technique for strengthening concrete structures all over the world. The mechanical performance of the interface between FRP and concrete is one of the key factors affecting the behavior of the strengthened structure. The debonding behavior of FRP-to-concrete interface is related to specific bonded joint. Compared with the pull-push bonded joint, there are few studies revealing the interface mechanical behavior of pull-pull bonded joint so far, and in-depth theoretical study is not profound enough either. This paper presents an analytical solution for the debonding process in such an FRP-toconcrete bonded joint in single-shear model. Base on the realistic bi-linear local bond-slip law, two critical lengths are obtained, and the interface debonding failure follows different regimes. Closed form expressions for the interfacial relative slip, shear stress distribution, normal stress in the FRP plate and the load-displacement response at the loaded end are derived for different loading stages, whose accuracy is verified by finite element numerical simulation. While the solution is developed with particular reference to FRP-to-concrete bonded joints, it can be equally applicable to similar bonded joints made of other materials (e.g. FRP-to-steel).

关键词： Fiber reinforced polymer FRP-to-concrete interface Bonded joint Shear failure Nonlinear fracture mechanics Analytical solution

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A novel method for comfort assessment in a supine sleep position using three-dimensional scanning technology

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INTERNATIONAL JOURNAL OF INDUSTRIAL ERGONOMICS 2018年 67卷 104-113页

作者： Wu, Jiayu Yuan, Hong Li, Xin Jinan Univ Inst Appl Mech MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China

Mechanical interaction behavior between human body and mattress is one of the crucial physical factors affecting the sleep comfort and quality. This paper proposes a novel method for sleep (dis)comfort level assessment in a supine posture without interfering with sleep in an attempt to improve mattress design. Three-dimensional (3D) back surface model is constructed by scanning human body in an upright standing position. Based on the mechanical property of mattress and body pressure distribution measured by Tactilus system, finite element (FE) models are established to numerically calculate mattress upper surface indentation. Finally, Pearson correlation coefficient similarity measure is used to evaluate sleep (dis)comfort by compared back surface with mattress upper surface indentation. The experimental process is validated with two distinct types of mattress, namely palm fiber mattress and latex foam/palm fiber mattress. Results show that all the participants feel more comfortable when lying on latex foam/palm fiber mattress, which are in excellent agreement with the results obtained by body pressure distribution and spinal alignment.

关键词： Sleep comfort Body pressure 3D body scanning Similarity measure Finite element analysis Back surface

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Nonlinear damage detection using linear ARMA models with classification algorithms

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SMART STRUCTURES AND SYSTEMS 2020年第1期26卷 23-33页

作者： Chen, Liujie Yu, Ling Fu, Jiyang Ng, Ching-Tai Guangzhou Univ Sch Civil Engn Guangzhou Higher Educ Mega Ctr 230 Wai Huan Xi Rd Guangzhou Peoples R China Jinan Univ MOE Key Lab Disaster Forecast & Control Engn 601 West Huangpu Ave Guangzhou Peoples R China Guangzhou Higher Educ Mega Ctr Guangzhou Univ Tamkang Univ Joint Res Ctr Engn St 230 Wai Huan Xi Rd Guangzhou Peoples R China Univ Adelaide Sch Civil Environm & Min Engn North Terrace Adelaide SA 5005 Australia

Majority of the damage in engineering structures is nonlinear. Damage sensitive features (DSFs) extracted by traditional methods from linear time series models cannot effectively handle nonlinearity induced by structural damage. A new DSF is proposed based on vector space cosine similarity (VSCS), which combines K-means cluster analysis and Bayesian discrimination to detect nonlinear structural damage. A reference autoregressive moving average (ARMA) model is built based on measured acceleration data. This study first considers an existing DSF, residual standard deviation (RSD). The DSF is further advanced using the VSCS, and then the advanced VSCS is classified using K-means cluster analysis and Bayes discriminant analysis, respectively. The performance of the proposed approach is then verified using experimental data from a three-story shear building structure, and compared with the results of existing RSD. It is demonstrated that combining the linear ARMA model and the advanced VSCS, with cluster analysis and Bayes discriminant analysis, respectively, is an effective approach for detection of nonlinear damage. This approach improves the reliability and accuracy of the nonlinear damage detection using the linear model and significantly reduces the computational cost. The results indicate that the proposed approach is potential to be a promising damage detection technique.

关键词： nonlinear damage detection time series analysis linear autoregressive moving average model vector space cosine similarity classification algorithms

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Dynamic Response of Asymmetric and Nonlinear Packaging System under Random Excitation

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SHOCK AND VIBRATION 2020年第1期2020卷

作者： Yang, Song-Ping Wang, Zhi-Wei Jinan Univ Packaging Engn Inst Zhuhai 519070 Peoples R China Jinan Univ Key Lab Prod Packaging & Logist Guangdong Higher Zhuhai 519070 Peoples R China Jinan Univ Sch Mech & Construct Engn MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Peoples R China

This paper focuses on the dynamic response of three asymmetric and nonlinear packaging systems (ANPSs) of practical transport package under random excitation. Next to presenting the displacement probability density functions (PDFs) of ANPSs derived through FPK equations, the influences of the excitation grades and the characteristic parameters (such as the damping, the nonlinear stiffness, and the strain) of packaging cushion materials on the response are discussed in detail. Then, the generalized PDFs of the response peaks are defined and examined by three common distributions. The investigation shows that "inverse excitation cushion factors" (IECFs) have a significance on effecting the displacement PDFs approaching different distributions. Most PDFs of the unilateral response peaks approach Rayleigh distributions and present non-Gaussian characters. The present methods are verified through the validation numerical solutions. Furthermore, the application of the scheme for fatigue damage evaluation of the transport package is carried out.

关键词： Probability density function

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Lattice chain theories for dynamics of acoustic flexural phonons in nonpolar nanomaterials

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Physical Review B 2020年第14期102卷 144301-144301页

作者： Y. Kuang L. Lindsay Q. Wang L. He School of Mechanics and Construction Engineering MOE Key Laboratory of Disaster Forecast and Control in Engineering Jinan University Guangzhou 510632 China Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Department of Modern Mechanics University of Science and Technology of China Hefei 230026 China

Knowledge of lattice dynamics of acoustic flexural phonons is critically important in understanding the mechanical, electrical, and thermal properties of nanomaterials. However, the general nature of acoustic flexural phonons for the span of possible nanomaterials and the dependence of these on microscopic material properties remain unclear. Therefore, we develop general lattice chain theories to understand acoustic flexural vibrations in covalent and van der Waals lattices. The analytic theories suggest that the flexure branch has quadratic dispersion for low dimensional lattices in the long-wavelength limit, quite different from linear branches in bulk van der Waals bonded lattices like graphite. Surprisingly, interlayer van der Waals interactions in multilayer lattices do not determine the behavior of the flexural dispersion. The bonds of covalent interactions in multilayer and buckled monolayer lattices play different roles in determining the flexural dispersion with those in flat monolayer lattices, e.g., graphene. Further, based on the correspondence between microscopic and continuum dynamics, we provide a universal and effective approach to characterize the intrinsic bending rigidity of low dimensional nanomaterials using dispersion data.

关键词： Acoustic phonons Bending Mechanical properties of membranes

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Feasibility Study of Anchored Fiber-Optic Strain-Sensing Arrays for Monitoring Soil Deformation beneath Model Foundation

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GEOTECHNICAL TESTING JOURNAL 2019年第4期42卷 966-984页

作者： Zhang, Cheng-Cheng Zhu, Hong-Hu Chen, Dong-Dong Xu, Xing-Yu Shi, Bin Chen, Xiao-Ping Nanjing Univ Sch Earth Sci & Engn 163 Xianlin Ave Nanjing 210023 Jiangsu Peoples R China Univ Calif Berkeley Dept Civil & Environm Engn Berkeley CA 94720 USA Jinan Univ Coll Sci & Engn MOE Key Lab Disaster Forecast & Control Engn 601 Huangpu Ave Guangzhou 510632 Guangdong Peoples R China

High-accuracy deformation measurement is an essential part of geotechnical model testing, in which fiber-optic sensors have great potentialities. In this study, a 1-g plane-strain model test was performed to investigate the feasibility of using fiber Bragg grating (FBG) strain-sensing arrays for monitoring soil deformation beneath a strip footing. The FBG array with specially made anchors was designed to enhance the fiber-soil interfacial bond and, hence, to improve the measurement quality. Three arrays were embedded horizontally within the soil to monitor internal linear strains, while digital photography-based particle image velocimetry (PIV) was employed to obtain superficial displacement and strain fields. Test results show that the strains captured by FBGs were comparable with equivalent strains determined via PIV analyses in terms of strain development, which reflected the evolution of soil deformation under incremental loads. Finally, the benefits and drawbacks of anchored FBG arrays for monitoring laboratory-scale models were discussed, with the conclusion being that they are capable of capturing internal strains or a strain profile of soil with low noise and high resolution, but there has to be a trade-off between robustness and sensitivity.

关键词： fiber Bragg grating strip footing strain measurement particle image velocimetry fiber-optic sensor

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Bibliometric Analysis of Monte Carlo Based on Citespace 4

Bibliometric Analysis of Monte Carlo Based on Citespace

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4th IEEE International Conference on Image, Vision and Computing, ICIVC 2019

作者： Yang, Songping Yang, Fan Zhang, Ranni Zhang, Landian Packaging Engineering Institute Jinan University Zhuhai China MOE Key Laboratory of Disaster Forecast and Control in Engineering School of Mechanics and Construction Engineering Jinan University Zhuhai China Electrical Engineering Institute Jinan University Zhuhai China Zhuhai Campus Jinan University Zhuhai China

ISBN: (纸本)9781728123257

As an effective method for solving nonlinear problems and simulating models, Monte Carlo method (MCM) has attracted more and more attention in recent years, which has been successfully applied in fields such as electrical and electronic engineering, physical chemistry, material science and geophysics. In this paper, the research progress of MCM is introduced based on the analysis of the literature in the field of MCM in Citespace. Based on the visualization results, the Evolution Law of MCM Research, the research hotspot and the future trend are discussed. This study will provide important reference resources for theoretical researchers and practitioners in the fields of solving non-linear problems and system simulation. © 2019 IEEE.

关键词： Monte Carlo methods

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Prediction Model and Experimental Study on Braking Distance under Emergency Braking with Heavy Load of Escalator

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MATHEMATICAL PROBLEMS IN engineering 2020年第1期2020卷

作者： Li, Zhongxing Ma, Haixia Xu, Peng Peng, Qifeng Huang, Guojian Liu, Yingjie Guangzhou Acad Special Equipment Inspect & Testin Guangzhou 510180 Peoples R China South China Univ Technol Guangzhou Coll Guangzhou 510800 Peoples R China Jinan Univ Sch Mech & Construct Engn MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Peoples R China

In order to study the relationship between the braking distance and the load of escalator and realize the prediction of the rated load braking distance with a little load, the method of combining theoretical analysis and experimental research is used. First, the dynamic characteristics of the escalator during emergency braking are analyzed, and the prediction model of the braking distance of the escalator under different loads is derived based on the law of conservation of energy. Furthermore, the influence coefficients under different loads were determined through experimental studies, the model was revised, and the concept of equivalent no-load kinetic energy (ENKE) was proposed. The research shows that the braking distance of the escalator increases nonlinearly with the increase in load. When the no-load braking distance and the 25% rated load braking distance change greatly, the braking distance increases faster as the load increases;the escalators with large brake force have a small ENKE and are easy to stop. Otherwise, it is difficult to stop. The test results show that the comparison between the predicted value of the prediction model and the measured value has a maximum error of 2.7%, and the maximum error at rated load is only 2.0%, which fully meets the needs of engineering measurement. And the prediction method reduces test costs, enhances test security, and improves test coverage.

关键词： Kinetics

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