检索结果-南通市图书馆

Review Article on condition assessment of Structures Using Electro-Mechanical Impedance Technique

在线全文

学校读者我要写书评

暂无评论

Structural Durability & Health Monitoring 2022年第2期16卷 97-128页

作者： Krishna Kumar Maurya Anupam Rawat Rama Shanker Department of Civil Engineering MNNIT AllahabadPrayagraj211004India

Structural health monitoring(SHM)is a process for determination of presence,location,severity of damages and remaining life of the *** is widely applied in aerospace,mechanical and civil engineering sys-tems to assess the conditions of structures to improve the operation,safety,serviceability and reliability,*** are various SHM techniques for monitoring the health of structures such as global response based and local *** occur in the structures due to its inability to withstand intended design loadings,physical environment and chemical ***,damage identification is necessary to improve the durability of the structures for protection against catastrophic *** research paper is focused on elec-tro-mechanical impedance(EMI)technique which is one of the techniques based on smart *** smart materials are utilized for monitoring the health of the *** are used for damage determination and its quantification for the interrogated *** in admittance or impedance signature shows the existence of damage in the ***,the different statistical methods viz.,root mean square deviation(RMSD),mean absolute percentage deviation(MAPD),covariance(Cov),and correlation coefficient(CC)are used for the quantification of *** material such as piezoelectric materials,its properties and applica-tions are also *** this paper,the implementation of EMI technique based on different recent advances in smart materials and their appropriateness have been ***,the reviewed investigations are significant for the monitoring of real-life *** presented paper is the compact state-of-the-art for EMI technique which is used for *** examination will be valuable to infrastructural health monitoring and engineering applications in respect to innovative research directions.

关键词： Structural health monitoring condition assessment EMI technique PZT patches damages

Application of uncertain type of AHP to condition assessment of cable-stayed bridges

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Southeast University(English Edition) 2007年第4期23卷 599-603页

作者：黄侨任远林阳子东南大学桥梁与隧道工程研究所南京210096 哈尔滨工业大学桥梁工程研究所哈尔滨150090

In order to guarantee the safety service and life-span of long-span cable-stayed bridges, the uncertain type of analytic hierarchy process （AHP） method is adopted to access the bridge condition. The correlative theory and applied objects of uncertain type of AHP are introduced, and then the optimal transitive matrix method is chosen to calculate the interval number judgment matrix, which makes the weights of indices more reliable and accurate. Finally, with Harbin Songhua River Cable-Stayed Bridge as an example, an index system and an assessment model are proposed for the condition assessment of this bridge, and by using uncertain type of AHP, the weights of assessment indices are fixed and the final assessment results of the bridge are calculated, which proves the feasibility and practicability of this method. The application of this assessment method can provide the scientific basis for maintenance and management of long-span cable-stayed bridges.

关键词： cable-stayed bridge condition assessment uncertain type of analytic hierarchy process interval number judgment matrix

WATERiD＇s Novel Methodology for condition assessment Cost Data Collection and Visualization

在线全文

学校读者我要写书评

暂无评论

Journal of Civil Engineering and Architecture 2015年第4期9卷 419-428页

作者： Stephen M. Welling Sunil K. Sinha Department of Civil and Environmental Engineering. Virginia Tech Blacksburg 24061 USA

A profound understanding of the costs to perform condition assessment on buried drinking water pipeline infrastructure is required for enhanced asset management. Toward this end, an automated and uniform method of collecting cost data can provide water utilities a means for viewing, understanding, interpreting and visualizing complex geographically referenced cost information to reveal data relationships, patterns and trends. However, there has been no standard data model that allows automated data collection and interoperability across platforms. The primary objective of this research is to develop a standard cost data model for drinking water pipeline condition assessment projects and to conflate disparate datasets from differing utilities. The capabilities of this model will be further demonstrated through performing trend analyses. Field mapping files will be generated from the standard data model and demonstrated in an interactive web map created using Google Maps API （application programming interface） for JavaScript that allows the user to toggle project examples and to perform regional comparisons. The aggregation of standardized data and further use in mapping applications will help in providing timely access to condition assessment cost information and resources that will lead to enhanced asset management and resource allocation for drinking water utilities.

关键词： Drinking water pipeline condition assessment water pipeline cost data.

STUDY AND PRACTICE IN THE condition assessment STSTEM OF LONG SPAN BRIDGES

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

STUDY AND PRACTICE IN THE CONDITION ASSESSMENT STSTEM OF LON...

Study on Structural Safety Monitoring and condition assessment System for Nanjing Yangtze River Bridge

The International Symposium on Innovation & Sustainability of Structures in Civil Engineering

作者： Tong Guo and Aiqun Li College of Civil Engineering Southeast University Nanjing 210018 China

＜正＞Bridges are in an environment that varies with time, where some random variables such as temperature, wind and traffic load play an important role in the performance of bridges. To consider the effect of these uncertain factors on bridge safety, the probability a nalysis based on the combined numerical simulation method of Monte Carlo method and Response Surface method is used to calculate the structural probability under different situations. Finally, using the data from SHM system, the probability index β is a-chieved, upon this index, the reliability class and maintenance action can be determined primarily. Sometimes the data collected from the sensors are of a .fuzzy set, and the same is their e-valuation classes, so except for the probability assessment, the fuzzy analytic hierarchy process （FAHP） is also introduced in this paper. Moreover, the factor weight synthesizing technique and some data processing techniques used in comprehensive evaluation are also presented. Through the FAHP, the frame of comprehensive evaluation has been built. According to the theories and methods above, the condition assessment system of Run-yang bridge has been set up primarily. Introduction to this system is provided in this paper to show how it works. Combined with the health monitoring system on the bridge and daily inspection, the online evaluation of Runyang bridge can be realized elementari- ly.

关键词： condition assessment structural reliability fuzzy analytic hierarchy process.

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Study on Structural Safety Monitoring and Condition Assessme...

An assessment model of water pipe condition using Bayesian inference

2004安全科学与技术国际会议

作者： HUANG Fanglin1 HUANG Dongsheng2 ZENG Chuhui1 HE Xuhui1 & CHEN Zhengqing1 3 (1School of Civil Engineering and Architecture Central South University Changsha 410075 Hunan China) (2 School of Automobile and Mechanical Engineering Changsha Univ of Sci and Tech Changsha 410076 Hunan China) (3 School of Civil Engineering Hunan University Changsha 410082 Hunan China)

The safety monitoring and condition assessment system (SMCAS) constructed for the Nanjing Yangtze River Bridge (NYRB) and its functions are introduced in this paper. The SMCAS, which allows the bridge

关键词： structural safety monitoring and condition assessment system Nanjing Yangtze River Bridge safety monitoring condition assessment

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第7期11卷 495-504页

作者： Chen-wan WANG Zhi-guang NIU Hui JIA Hong-wei ZHANG School of Environment Science and Technology 27anjin University Tianjin 300072 China School of Environment and Chemical Engineering Tianjin Polytechnic University Tianjin 300160 China

An accurate understanding of the condition of a pipe is important for maintaining acceptable levels of service and providing appropriate strategies for maintenance and rehabilitation in water supply systems. Many factors contribute to pipe deterioration. To consolidate information on these factors to assess the condition of water pipes, this study employed a new ap-proach based on Bayesian configuration against pipe condition to generate factor weights. Ten pipe factors from three pipe ma-terials (cast iron, ductile cast iron and steel) were used in this study. The factors included size, age, inner coating, outer coating, soil condition, bedding condition, trench depth, electrical recharge, the number of road lanes, material, and operational pressure. To address identification problems that arise when switching from pipe factor information to actual pipe condition, informative prior factor weight distribution based on the literature and previous knowledge of water pipe assessment was used. The influence of each factor on the results of pipe assessment was estimated. Results suggested that factors that with smaller weight values or with weights having relative stable posterior means and narrow uncertainty bounds, would have less influence on pipe conditions. The model was the most sensitive to variations of pipe age. Using numerical experiments of different factor combinations, a simplified model, excluding factors such as trench depth, electrical recharge, and the number of road lanes, is provided. The proposed Bayesian inference approach provides a more reliable assessment of pipe deterioration.

关键词： Bayesian inference condition assessment Pipe factor Water distribution system Weight

Power transmission risk assessment considering component condition

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2014年第1期2卷 50-58页

作者： Lei GUO Qiwei QIU Jian LIU Yu ZHOU Linglei JIANG North Subsection of State Grid Corporation of China Beijing 100053China Shanghai Electric Power Company Shanghai 201400China Maintenance Company of Shanghai Electric Power Company Shanghai 200000China

This paper proposes a new method for power transmission risk assessment considering historical failure statistics of transmission systems and operation failure risks of system *** failure risks are integrated into the new method based on operational condition assessment of components using the support vector data description(SVDD)*** traditional outage probability model of transmission lines has been modified to build a new framework for power transmission system risk *** proposed SVDD approach can provide a suitable mechanism to map component assessment grades to failure risks based on probabilistic behaviors of power system *** the new method,both up-todate component failure risks and traditional system risk indices can be processed with the proposed outage *** a result,component failure probabilities are not only related to historical statistic data but also operational data of components,and derived risk indices can reflect current operational conditions of *** simulation studies,the SVDD approach is employed to evaluate component conditions and link such conditions to failure rates using up-to-date component operational data,including both on-line and off-line data of *** IEEE 24-bus RTS-1979 system is used to demonstrate that component operational conditions can greatly affect the overall transmission system failure risks.

关键词： Risk assessment Component failure risk Outage probability condition assessment Support vector data description

Analysis and assessment of bridge health monitoring mass data——progress in research/development of “Structural Health Monitoring”

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2012年第8期55卷 2212-2224页

作者： LI AiQun DING YouLiang WANG Hao GUO Tong Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education Southeast UniversityNanjing 210096China

The "Structural Health Monitoring" is a project supported by National Natural Science Foundation for Distinguished Young Scholars of China(Grant No.50725828).To meet the urgent requirements of analysis and assessment of mass monitoring data of bridge environmental actions and structural responses,the monitoring of environmental actions and action effect modeling methods,dynamic performance monitoring and early warning methods,condition assessment and operation maintenance methods of key members are systematically studied in close combination with structural characteristics of long-span cable-stayed bridges and suspension *** paper reports the progress of the project as follows.(1) The environmental action modeling methods of long-span bridges are established based on monitoring data of temperature,sustained wind and *** action effect modeling methods are further developed in combination with the multi-scale baseline finite element modeling method for long-span bridges.(2) The identification methods of global dynamic characteristics and internal forces of cables and hangers for long-span cable-stayed bridges and suspension bridges are proposed using the vibration monitoring data,on the basis of which the condition monitoring and early warning methods of bridges are developed using the environmental-condition-normalization technique.(3) The analysis methods for fatigue loading effect of welded details of steel box girder,temperature and traffic loading effect of expansion joint are presented based on long-term monitoring data of strain and beam-end displacement,on the basis of which the service performance assessment and remaining life prediction methods are developed.

关键词： structural health monitoring bridge mass data condition assessment environmental action

A structural health assessment method for shield tunnels based on torsional wave speed

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2014年第6期57卷 1109-1120页

作者： ZHOU Biao XIE XiongYao LI YongSheng Key Laboratory of Geotechnical & Underground Engineering Ministry of EducationTongji University Department of Geotechnical Engineering Tongji University

Following recent rapid developments in tunnel engineering in China,the heavy structural maintenance work of the future is likely to pose a great *** developed vibration-based health assessment and monitoring methods offer good prospects for large-scale structural monitoring,hidden surface detection and disease ***,because the dynamic properties of tunnels are sensitive to the coupling and damping effects of the surrounding soil,there is little relevant research on tunnel *** the PiP(pipe in pipe)model,the intrinsic tunnel modes and their response characteristics are investigated in this paper,and the degree to which the identification of these characteristics is influenced by mode superposition and the soil coupling effect are also *** response features of these flexible wave modes are found to be barely recognizable in a tunnel-soil coupled system,while the phase velocity of the torsional wave can be determined by combining phase spectrum analysis and the HHT(Hilbert-Huang transformation)method.A new structural health assessment method based on the torsional wave speed is therefore *** this method,the torsional wave speed is used to determine the tunnel structure’s global stiffness based on a newly developed dispersion *** calculated stiffness is then used to evaluate the tunnel’s structural service status.A field test was also carried out at a newly built tunnel to validate the proposed method;the tunnel structure’s Young’s modulus was obtained and was very close to the designed *** indicates that this method is an effective way to assess tunnel service conditions,and also provides a theoretical basis for future applications to health assessment of shield tunnels.

关键词： shield tunnel condition assessment torsional wave mode phase velocity