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An on-site evaluation method for corrosion degradation of in-service cable wires by image histogram matching 11

An on-site evaluation method for corrosion degradation of in...

11th International Workshop on Structural Health Monitoring 2017: Real-Time Material State Awareness and Data-Driven Safety Assurance, IWSHM 2017

作者： Xu, Yang Li, Shunlong Li, Hui Gu, Chenyu Li, Xinbin Chen, Xiaowei Qiao, Weidong Key Lab of Intelligent Disaster Mitigation Ministry of Industrial and Information Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Harbin150090 China Key Lab of Structures Dynamic Behavior and Control Ministry of Education Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China School of Transportation Science and Engineering Harbin Institute of Technology Harbin150090 China

ISBN: (纸本)9781605953304

This paper proposes a novel non-destructive method by image histogram matching to evaluate the corrosion degradation of cable wires in service quantitatively. Artificial accelerated salt spray test is adopted to simulate the corrosion environment, and adequate RGB images are taken by a consumer-grade camera to cover the whole information of corroded surface for each specimen under different corrosion periods. Histogram distribution analysis is applied to study the concentrated modes of RGB images, and joint Gaussian distribution is fitted to capture location parameters. Timevariant models of the location parameters are regressed and then the mechanical properties are learnt by tensile and fatigue tests. Once the features of RGB corrosion images of steel wires are matched to the proposed time-variant models, the corresponding corrosion degree and mechanical properties can be estimated. The proposed method is meaningful for the on-site evaluation of cable wires in service with no need to carry on corrosion and mechanical degradation tests after replacing cables.

关键词： Graphic methods

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A study on the stretch tensor of the beam end in a curved girder bridge caused by environmental temperature change 4th

A study on the stretch tensor of the beam end in a curved gi...

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4th International Conference on Civil, Architectural and Hydraulic engineering, ICCAHE 2015

作者： Liu, Jie-Shan Gao, Jing-Hong College of Science and Engineering Jinan University Guangzhou China Key Laboratory of Disaster Forecast and Control in Engineering Ministry of Education of China Guangzhou China

ISBN: (纸本)9781138029163

With day turning to night and summer to winter, the girder in the bridge would be lengthened or shortened. This is a normal phenomenon in every object. However, the curved girder bridge has a dissymmetric structure, supported shearing force, bending moment and torsion in the same node, which would stretch in an abnormal way when the temperature is changed. In this paper, using Midas Civil app after the theoretical analysis of thermodynamics, the displacement of the beam end is simulated in this finite element analysis software with the altering radius of the road centerline. By comparing these data of displacement with central angle in the equal radius of the girder, which work at the same temperature condition, the result shows that the connection between the displacement and central angle becomes approximate when considering in a small angle at the center. In addition, it would be a useful reference when installing the expansion joint. © 2016 Taylor & Francis Group, London.

关键词： Finite element method

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The research on the internal force effect of different vertical curves on a curved box girder bridge 4th

The research on the internal force effect of different verti...

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4th International Conference on Civil, Architectural and Hydraulic engineering, ICCAHE 2015

作者： Liao, Yu-Xiao Gao, Jing-Hong Department of Mechanics and Civil Engineering Jinan University Guangzhou China Key Laboratory of Disaster Forecast and Control in Engineering Ministry of Education of China Guangzhou China

ISBN: (纸本)9781138029163

Using the stimulated structure MIDAS Civil to conduct the calculation with REM modeling, this paper analyzes the internal force of the curved girder bridge whose radius of curvature is R = 200 m. Under the condition of the unaltered span and radius of curvature, this paper investigates the effect of the internal force variation of the continuous curved box girder bridge that is influenced by permanent load and moving load with different vertical curves. © 2016 Taylor & Francis Group, London.

关键词： Box girder bridges

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Research on the performance-based parameter of horizontal visor of certain wall relative to the sun zenith angle

International Journal of Multimedia and Ubiquitous Engineeri...

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International Journal of Multimedia and Ubiquitous engineering 2016年第4期11卷 267-276页

作者： Gao, Jian Tang, Jian Key Lab of Disaster Forecast and Control in Engineering Ministry of Education of the People’s Republic of China Jinan University China

The horizontal shading is one part of the buildings, outside shading systems. Relative sun elevation angle to the wall, and relative sun azimuthal angle to the wall γ are introduced. The optimum width for the southern shading of local buildings can be calculated according to the law of solar altitude change over time. In this research, relative sun elevation angle to the wallis key for design parameters determination of horizontal shading component. The present study optimized the design of the horizontal shading on the basis of the traditional design. The new design of the visor could still shade the exceeding sunlight in summer, but at the same time allow enough sunshine in winter. This design is environmental-friendly, energy and material-saving. © 2016 SERSC.

关键词： Walls (structural partitions)

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Analysis of the key points for increasing passenger traffic efficiencies based on measurements of traffic through ticket gates in 3 cities

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International Journal of Simulation: Systems, Science and Technology 2016年第24期17卷

作者： Tang, Jian Key Lab of Disaster Forecast and Control in Engineering Ministry of Education of the People’s Republic of China Jinan University GuangzhouGuangdong China

By 2012, the passenger traffic capacity for rail transport in Guangzhou reached the highest level of all the cities in China. A questionnaire survey of commuters revealed that 42% of those interviewed in Guangzhou thought the ticket Automatic Gate Machine (AGM) was the most time-consuming aspect of the rail transport system, and its capacity could not meet commuter demand. Therefore, this research focused on the ticket gate machine and its effect on passenger traffic. In addition, concentrating on the sensor area of the ticket gate machine and investigating the machines in Guangzhou, Shenzhen and Hong Kong regions, the optimized key points for increasing passenger traffic efficiencies were found. These were whether the sensor areas lay flat or oblique and whether raised or not, and the color design of the sensor area. © 2016, UK Simulation Society. All rights reserved.

关键词： Efficiency

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Study on prediction for fracturing operation noise and impact assessment

Study on prediction for fracturing operation noise and impac...

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2016 IEEE International Conference of Online Analysis and Computing Science, ICOACS 2016

作者： Jingcheng, Liu Junlong, Jiang Lin, Mei Jumei, Liu Yu, Wang Institute of Petroleum and Gas Engineering Chongqing University of Science and Technology Chongqing China School of Aerospace Mechanical and Manufacturing Engineering RMIT University VIC Australia Chongqing Gas Field-Southwest Oil and Gas Field Branch Petro China Company Limited Chongqing China Key Lab. for Exploitation of China Southwestern Resources and Environmental Disaster Control Engineering Ministry of Education Chongqing University Chongqing China Research Institute of Safety and Environmental Protection and Technology Supervision Petro China Company Limited Chengdu China

ISBN: (纸本)9781467377546

Fracturing is one of the key stimulation treatment techniques with wide application prospect for oil-gas well and is a kind of main form of natural gas exploitation currently, which is especially important for development of shale gas. However, the noise generated in the process of fracturing operation may impact the site operators and residents in the periphery. The typical fracturing operation process is selected in this paper to implement the actual measurement of noise and record such relevant parameters as operation condition and ambient environment. Based on the computation method of outdoor acoustic transmission attenuation, Cadna/A ambient noise simulation software is utilized to establish the acoustic environment simulation simplification model for certain oil well fracturing operation, implement the simulation study for noise impact distribution condition in the process of fracturing operation construction and perform the contrastive analysis for actually-measured value on the site. The result shows that the site operator's contact noise value is higher than the occupational exposure limit in National Occupational Sanitary Standard GBZ 2.2-2007 Occupational Exposure Limit for Harmful Factors in Workplace and the noise produced during operation in the daytime doesn't meet the emission limit in National Standard GB 12348-2008 Emission Standard for Ambient Noise at the Boundary of Industrial Enterprise. Therefore, in combination with the actual fracturing operation, the reasonable noise prevention and control measures are proposed. The study result of this paper has certain reference value for prediction and assessment of fracturing operation noise. © 2016 IEEE.

关键词： forecasting

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Study on Prediction for Fracturing Operation Noise and Impact Assessment

Study on Prediction for Fracturing Operation Noise and Impac...

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2016 IEEE International Conference of Online Analysis and Computing Science(ICOACS 2016)

作者： Liu Jingcheng Jiang Junlong Mei Lin Liu Jumei Wang Yu Institute of Petroleum & Gas Engineering Chongqing University of Science and Technology School of Aerospace Mechanical&Manufacturing EngineeringRMIT University Chongqing gas field Southwest Oil and Gas Field BranchPetro China Company Limited Key Lab for Exploitation of China Southwestern Resources & Environmental Disaster Control Engineering Ministry of EducationChongqing University Research Institute of safety and environmental protection and technology supervision Petro China Company Limited

Fracturing is one of the key stimulation treatment techniques with wide application prospect for oil-gas well and is a kind of main form of natural gas exploitation currently,which is especially important for development of shale ***,the noise generated in the process of fracturing operation may impact the site operators and residents in the *** typical fracturing operation process is selected in this paper to implement the actual measurement of noise and record such relevant parameters as operation condition and ambient *** on the computation method of outdoor acoustic transmission attenuation,Cadna/A ambient noise simulation software is utilized to establish the acoustic environment simulation simplification model for certain oil well fracturing operation,implement the simulation study for noise impact distribution condition in the process of fracturing operation construction and perform the contrastive analysis for actually-measured value on the *** result shows that the site operator's contact noise value is higher than the occupational exposure limit in National Occupational Sanitary Standard GBZ 2.2-2007 Occupational Exposure Limit for Harmful Factors in Workplace and the noise produced during operation in the daytime doesn't meet the emission limit in National Standard GB 12348-2008 Emission Standard for Ambient Noise at the Boundary of Industrial ***,in combination with the actual fracturing operation,the reasonable noise prevention and control measures are *** study result of this paper has certain reference value for prediction and assessment of fracturing operation noise.

关键词： Fracturing noise prediction assessment prevention and control measures

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Comparative analysis of monetary and emergy dimension methods in calculating the payback period of photovoltaic (PV) curtain wall

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Energy education Science and Technology Part A: Energy Science and Research 2014年第5期32卷 3269-3276页

作者： Ding, Likui Tang, Jian Jinan University Key Lab of Disaster Forecast and Control in Engineering Ministry of Education of the People’s Republic of China Guangzhou Guangdong China

In this study, method of monetary dimension considering the energy consumption difference and without considering the energy consumption difference are used to calculate the payback period of PV curtain wall;Besides the emergy dimension method is also introduced to calculate the payback period. An example is studied by the above methods. Comparative analysis shows that the payback period of PV curtain wall calculated by the monetary dimension method considering the energy consumption difference is shorter than that does not consider the energy consumption difference. Among them the payback period of PV curtain wall calculated by the method of emergy dimension is the shortest. The main reason for this is that the emergy dimension method analyzes an ideal condition which doesn’t include human factors while those factors exist in monetary dimension method. Taking the energy consumption difference into consideration in the calculation of the payback period of PV curtain wall makes the calculation more scientific, and the emergy dimension analysis illustrates the broad prospects for the development of PV curtain wall. © Sila Science. All rights reserved.

关键词： Energy utilization

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Seismic fragility analysis of steel-concrete composite bridges excited by near-fault ground motions

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Tumu Gongcheng Xuebao/China Civil engineering Journal 2016年 49卷 56-60and77页

作者： Liu, Yang Lu, Dagang Yu, Xiaohui Key Lab of Structural Dynamic Behavior and Control of China Ministry of Education Harbin Institute of Technology Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China State Key Laboratory for Disaster Reduction in Civil Engineering Tongji University Shanghai200092 China

The seismic fragility analysis was conducted for a steel-concrete composite bridge (SCCB) including the effects of the near-fault pulse-like ground motions. A total of 60 real ground motions were selected from the PEER strong earthquake database as the inputs. The global fragility curves and local fragility curves of the bridge were obtained through the fragility analysis. Compared to the fragility results of the far-field earthquake records, it is found that the demands due to the near-fault ground motions are significantly larger than that due to the far-field ground motions. Under the near-fault pulse-like ground motions, the pier is the most fragile component, while the concrete crossbeam and the studs are less fragile. © 2016, Editorial Office of China Civil engineering Journal. All right reserved.

关键词： Concretes

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Molecular dynamic simulation of the mechanical properties of PI/SIO2 nanocomposite based on materials studio

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Journal of Chemical and Pharmaceutical Research 2014年第6期6卷 1534-1539页

作者： Mo, Yuzhen Zhang, Hui Xu, Jiachu Department of Mechanics and Civil Engineering Jinan University Guangzhou China Key Lab of Disaster Forecast and Control in Engineering Ministry of Education Jinan University Guangzhou China

The initial unit cell models of PI/SiO2Nanocomposite and pure polyimide were built by Materials Studio, the stiffness matrix and mechanical parameters such as Young modulus, shear modulus, bulk modulus and Poisson ratio of the unit cells were achieved after molecular dynamic (MD) optimizations and calculations. Finally, the mechanical properties of pure polyimide and the PI/SiO2 nanocomposite with 5vol.% and 10vol.% nanosilica were compared. The result shows that the mechanical properties of polyimide can be remarkably reinforced by being filled with a low volume faction of silica-nanoparticle. © 2014, Journal of Chemical and Pharmaceutical Research. All rights reserved.

关键词： Nanocomposites

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