Journal of Traffic and Transportation Engineering-English Edition最新文献

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Advances and applications of wind engineering in exceptional terrain 特殊地形风力工程的进展与应用
IF 7.4 2区 工程技术
Journal of Traffic and Transportation Engineering-English Edition Pub Date : 2024-12-01 DOI: 10.1016/j.jtte.2024.09.002
Jiawu Li , Shucheng Yang , Jianming Hao , Guangzhong Gao , Feng Wang , Hua Bai , Guohui Zhao , Yu Li , Xiaofeng Xue
{"title":"Advances and applications of wind engineering in exceptional terrain","authors":"Jiawu Li ,&nbsp;Shucheng Yang ,&nbsp;Jianming Hao ,&nbsp;Guangzhong Gao ,&nbsp;Feng Wang ,&nbsp;Hua Bai ,&nbsp;Guohui Zhao ,&nbsp;Yu Li ,&nbsp;Xiaofeng Xue","doi":"10.1016/j.jtte.2024.09.002","DOIUrl":"10.1016/j.jtte.2024.09.002","url":null,"abstract":"<div><div>Wind engineering has made significant strides in addressing the challenges posed by exceptional terrains, where traditional methodologies often fall short. This paper reviews the advances in wind tunnel technology and computational fluid dynamics (CFD) that have revolutionized the understanding and prediction of wind effects on bridges, particularly in complex environments. The integration of advanced measurement techniques with wind tunnel experiments has provided deeper insights into wind characteristics, leading to more accurate aerodynamic designs for bridges. The application of these technologies in unique terrains has been instrumental in ensuring the safety and stability of critical infrastructures. The paper reviews the importance of continuous research and collaboration in wind engineering to address the evolving demands of infrastructure in challenging terrains. The article also introduces the wind tunnel facilities at Chang'an University, detailing their capabilities and contributions to research in wind engineering, including the study of aerodynamic performance and control measures for bridges. It is concluded by reflecting on the research team's 20-year journey at Chang'an University, noting their growth, achievements, and contributions to the field of wind engineering.</div></div>","PeriodicalId":47239,"journal":{"name":"Journal of Traffic and Transportation Engineering-English Edition","volume":"11 6","pages":"Pages 1023-1209"},"PeriodicalIF":7.4,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143357374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Studying the performance of pavement defects at different road slopes using the vibration-based method and deep machine learning 利用基于振动的方法和深度机器学习研究不同路堑路面缺陷的性能
IF 7.4 2区 工程技术
Journal of Traffic and Transportation Engineering-English Edition Pub Date : 2024-12-01 DOI: 10.1016/j.jtte.2024.01.002
Amir Shtayat
{"title":"Studying the performance of pavement defects at different road slopes using the vibration-based method and deep machine learning","authors":"Amir Shtayat","doi":"10.1016/j.jtte.2024.01.002","DOIUrl":"10.1016/j.jtte.2024.01.002","url":null,"abstract":"<div><div>Road networks are the backbone of urban life and significantly impact the sustainability of any country's infrastructure sector. Therefore, it is necessary to maintain the condition of roads and pavements through continuous monitoring and periodic maintenance in order to achieve the highest levels of service for road users and the sustainability of their use. Pavement is the main component of road networks, providing the highest degree of comfort to drivers and roadway users when it is appropriately designed and free from defects and cracks. More clearly, defects are one of the most important factors that reduce the operational life of roads and cause economic losses to road users by causing damage to their vehicles; moreover, the damaged pavement needs frequent and long maintenance that may also drain the resources of government institutions and transport agencies. Therefore, there is a crucial need for a monitoring and follow-up system for the condition of the roads in order to identify and treat defects quickly. This study used a vibration-based system to monitor pavement conditions on several roads with different gradients. A fully electric car was used to determine the vibration values, which indicate the degree of driving comfort, to determine the spread and behaviour of defects on the pavement at multiple locations on roads with different gradients. Also, a machine learning model was applied using a “decision tree” model to identify, classify and predict defects on the pavements. The results of this study indicated that pavement defects were more prevalent in the first and last quadrants of the high-slope roads compared to the low-slope roads. The prediction model achieved accuracy in predicting the performance of defects with a rate of 94% for roads with low gradients and 90% and 86% for roads with medium and high gradients, respectively.</div></div>","PeriodicalId":47239,"journal":{"name":"Journal of Traffic and Transportation Engineering-English Edition","volume":"11 6","pages":"Pages 1259-1267"},"PeriodicalIF":7.4,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143324047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A review of lithium-ion battery state of health and remaining useful life estimation methods based on bibliometric analysis 基于文献计量学分析的锂离子电池健康状态和剩余使用寿命估算方法综述
IF 7.4 2区 工程技术
Journal of Traffic and Transportation Engineering-English Edition Pub Date : 2024-12-01 DOI: 10.1016/j.jtte.2024.09.004
Xu Lei, Fangjian Xie, Jialong Wang, Chunling Zhang
{"title":"A review of lithium-ion battery state of health and remaining useful life estimation methods based on bibliometric analysis","authors":"Xu Lei,&nbsp;Fangjian Xie,&nbsp;Jialong Wang,&nbsp;Chunling Zhang","doi":"10.1016/j.jtte.2024.09.004","DOIUrl":"10.1016/j.jtte.2024.09.004","url":null,"abstract":"<div><div>In recent years, research on the state of health (SOH) and remaining useful life (RUL) estimation methods for lithium-ion batteries has garnered significant attention in the new energy sector. Despite the substantial volume of annual publications, a systematic approach to quantifying and analyzing these contributions is lacking. This study focuses on selecting pertinent literature related to lithium-ion battery SOH and RUL estimation from CNKI and WOS databases, spanning January 2010 to December 2023. Employing bibliometric tools such as VOSviewer and CiteSpace, we conduct visual analyses to elucidate the current state, development trends, and research frontiers in this domain. Our examination encompasses scholarly activity, year-wise literature distribution, international collaboration networks, structural dissemination, and journal contributions. The findings indicate an upward trend in annual publication output, with China, the United States, the United Kingdom, and Canada at the forefront of collaborative research efforts. China is increasingly recognized as a pivotal hub for global scholarly partnerships. Notably, Harbin Institute of Technology, Beijing Institute of Technology, Chongqing University, Chinese Academy of Sciences, and Beijing Jiaotong University are the top institutions in China and the world in terms of publications. The Journal of Energy Storage emerges as a prominent periodical, acclaimed both domestically and internationally for its rigorous standards and high-quality articles. Based on the research content from CNKI and WOS, VOSviewer clusters the main research directions into three themes: aging mechanisms, SOH estimation methods, and RUL prediction methods. Keywords such as ‘online estimation’, ‘hybrid models’, and ‘artificial neural networks’ feature prominently, signaling a strong emphasis on artificial intelligence strategies. The study concludes with a prospective outlook on imminent research trajectories regarding the health and longevity estimations of lithium-ion batteries, highlighting the critical need for ongoing innovation and collaboration in this essential field.</div></div>","PeriodicalId":47239,"journal":{"name":"Journal of Traffic and Transportation Engineering-English Edition","volume":"11 6","pages":"Pages 1420-1446"},"PeriodicalIF":7.4,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143323906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Integrated and holistic knowledge map of phase change materials for pavement: A scientometric analysis and bibliometric review 路面相变材料的综合和整体知识图谱:科学计量分析和文献计量回顾
IF 7.4 2区 工程技术
Journal of Traffic and Transportation Engineering-English Edition Pub Date : 2024-12-01 DOI: 10.1016/j.jtte.2024.05.001
Jiasheng Dai , Feng Ma , Zhen Fu , Chen Li , Yingjie Hou , Yalu Wen , Yanzhe Zou , Dongdong Yuan , Wenhao Dong , Ke Shi
{"title":"Integrated and holistic knowledge map of phase change materials for pavement: A scientometric analysis and bibliometric review","authors":"Jiasheng Dai ,&nbsp;Feng Ma ,&nbsp;Zhen Fu ,&nbsp;Chen Li ,&nbsp;Yingjie Hou ,&nbsp;Yalu Wen ,&nbsp;Yanzhe Zou ,&nbsp;Dongdong Yuan ,&nbsp;Wenhao Dong ,&nbsp;Ke Shi","doi":"10.1016/j.jtte.2024.05.001","DOIUrl":"10.1016/j.jtte.2024.05.001","url":null,"abstract":"<div><div>Elevated pavement temperatures contribute to the urban heat island effect and pose a risk of thermal damage to pavement. Thus, regulating pavement temperature is paramount to ensure its longevity, enhance traffic safety, and preserve the environment. Phase change materials (PCMs) with the latent heat characteristic can store and release thermal energy via phase transitions. PCMs can effectively control pavement structure temperatures within a relatively narrow range, mitigating thermal stress on asphalt pavements. This research aims to explore the current status and emerging trends in PCM integrated pavement engineering (PCMIPE) using the CiteSpace visual analysis tool. Relevant publications were systematically curated from the Web of Science core database, spanning 2011 to 2023. Subsequently, the co-authorships network maps (country, institution, author), co-cited network maps (co-cited journals, authors, and references), and keyword co-occurrence network maps were constructed to analyze the principal contributions in the PCMIPE field comprehensively. This analysis provides an understanding of the field's strengths, research domains, and knowledge structure and identifies current research focal points and emerging frontiers. The findings reveal that research within the PCMIPE field is still in its early stages, with a predominant emphasis on material design and performance assessment. Additionally, future research is anticipated to expand into economic analyses and exploration of environmental effects when integrating PCMs into pavement engineering. Furthermore, there is an emerging interest in investigating the synergy of PCMs with other functional pavement technologies. These results underscore the potential of the PCMIPE field and emphasize the importance of future research endeavors.</div></div>","PeriodicalId":47239,"journal":{"name":"Journal of Traffic and Transportation Engineering-English Edition","volume":"11 6","pages":"Pages 1317-1339"},"PeriodicalIF":7.4,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143356963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A systematic review of digital twins for electric vehicles 电动汽车数字孪生系统回顾
IF 7.4 2区 工程技术
Journal of Traffic and Transportation Engineering-English Edition Pub Date : 2024-10-01 DOI: 10.1016/j.jtte.2024.04.004
Shrey Verma , Ankush Sharma , Binh Tran , Damminda Alahakoon
{"title":"A systematic review of digital twins for electric vehicles","authors":"Shrey Verma ,&nbsp;Ankush Sharma ,&nbsp;Binh Tran ,&nbsp;Damminda Alahakoon","doi":"10.1016/j.jtte.2024.04.004","DOIUrl":"10.1016/j.jtte.2024.04.004","url":null,"abstract":"<div><div>The transport sector emits 18% of global CO<sub>2</sub>. Industry and consumers must adopt green mobility to reduce emissions and climate change. This will help achieve sustainability by improving efficiency and reducing greenhouse gas emissions. Thus, smart electric vehicles (SEVs) have emerged. Digital twins concept and technology may help launch SEVs to the market by analysing and optimising supporting infrastructure. This work aims to fill in the gaps between different pieces of research by giving a full review from a technical and scientifically neutral point of view. The study looks at how digital twin technology can be used in smart car systems by looking at its promise and the hurdles faced. Based on a comprehensive literature survey, this is the first in-depth look at how digital twin technology can be used in smart electric cars. The review has been organised into specific areas of the smart vehicle system, such as drive train system battery management system, driver assistance system, vehicle health monitoring system, vehicle power electronics. This review goes into detail about each component of the car to provide an overall view of the smart vehicle system as a whole. This review makes it easier to understand how digital twin technology can be utilized into each area from a scientific point of view. Lastly, the work looks at the technological and economic impact of digital twin technology, which will make considerable changes in car manufacturing processes, as well as help address current obstacles in utilizing advanced technologies.</div></div>","PeriodicalId":47239,"journal":{"name":"Journal of Traffic and Transportation Engineering-English Edition","volume":"11 5","pages":"Pages 815-834"},"PeriodicalIF":7.4,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Architecture, application, and prospect of digital twin for highway infrastructure 公路基础设施数字孪生的架构、应用和前景
IF 7.4 2区 工程技术
Journal of Traffic and Transportation Engineering-English Edition Pub Date : 2024-10-01 DOI: 10.1016/j.jtte.2024.03.003
Yue Wang , Huimin Wang , Weiming Wang , Shizhao Song , Xin Fu
{"title":"Architecture, application, and prospect of digital twin for highway infrastructure","authors":"Yue Wang ,&nbsp;Huimin Wang ,&nbsp;Weiming Wang ,&nbsp;Shizhao Song ,&nbsp;Xin Fu","doi":"10.1016/j.jtte.2024.03.003","DOIUrl":"10.1016/j.jtte.2024.03.003","url":null,"abstract":"<div><div>The years we are experiencing are often identified as those of the age of digital technologies, where “digital” is commonly associated with intelligence, efficiency, and convenience. The emergence of digital technologies has significantly impacted and transformed various aspects of our society compared to the past. In this panorama, some arising questions regard transportation infrastructure systems and, first of all, highway infrastructure. This research focuses on one central issue: how highways fit into this digital revolution. Actually, the work in this paper can be described as follows. Although there are many different theoretical model systems for the architecture of the digital twin, we have chosen to review the main body of research on the digital twin in highway infrastructure based on a relatively well-established modeling framework, the five-dimensional model of the digital twin. After discussing the components of the digital twin for highway infrastructure's five-dimensional model, the paper reviews some innovative technologies that make these items effective. In addition to this, the digital twin maturity level of highway infrastructure and the MBSE-based (model-based systems engineering) digital twin model for highway are also discussed in this paper. Therefore, the paper provides a bird's eye view of this extremely dynamic technology for a new system of intelligent highways and discusses some of their criticalities and strengths, allowing for the optimization and development of new transportation functions and services, improving the adaptability of highways to the digital revolution.</div></div>","PeriodicalId":47239,"journal":{"name":"Journal of Traffic and Transportation Engineering-English Edition","volume":"11 5","pages":"Pages 835-852"},"PeriodicalIF":7.4,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
RAP chunks produced in cold milling operation of asphalt pavement: Evaluation, mechanism, and engineering investigation in China 沥青路面冷铣刨机作业中产生的 RAP 块:中国的评估、机理和工程研究
IF 7.4 2区 工程技术
Journal of Traffic and Transportation Engineering-English Edition Pub Date : 2024-10-01 DOI: 10.1016/j.jtte.2024.03.004
Yuquan Yao , Jiangang Yang , Jie Gao , Mulian Zheng , Liang Song , Jing Xu , Chen Sun
{"title":"RAP chunks produced in cold milling operation of asphalt pavement: Evaluation, mechanism, and engineering investigation in China","authors":"Yuquan Yao ,&nbsp;Jiangang Yang ,&nbsp;Jie Gao ,&nbsp;Mulian Zheng ,&nbsp;Liang Song ,&nbsp;Jing Xu ,&nbsp;Chen Sun","doi":"10.1016/j.jtte.2024.03.004","DOIUrl":"10.1016/j.jtte.2024.03.004","url":null,"abstract":"<div><div>Cold milling is a widely used method for rehabilitating asphalt pavement, generating reclaimed asphalt pavement (RAP) chunks. Within this process, aggregates within the asphalt pavement will be crushed, forming RAP agglomerates and aggregate breakdown. However, the mechanism of these phenomena has remained unclear, and a unified evaluation method has yet to be established. In this study, RAP agglomeration and aggregate fragmentation were characterized, five distinct methods were systematically assessed, and the mechanism of RAP agglomeration and breakdown was analyzed by discrete element method (DEM) simulation based on setting different particle contact parameters, then followed by a mechanical analysis, and demonstrated in engineering. The results revealed that both agglomeration and aggregate breakdown occur within RAP particles of various sizes, with the five methods showing similar trends in quantifying these effects. Through DEM simulations and mechanical analyses, the aggregate breakdown predominantly occurs at the cutter's motion trajectory of the cutter and during crack propagation, while agglomeration was mainly related to the sliding surface's area. The milling speed and depth positively impact RAP agglomeration, while negatively affecting aggregate breakdown, and milling drum speed exerts minimal influence on these phenomena. RAP agglomeration varies considerably in different engineering projects, and cold milling parameters should be determined based on the material composition of the asphalt pavement and design requirements to control agglomeration and breakdown rates of RAP.</div></div>","PeriodicalId":47239,"journal":{"name":"Journal of Traffic and Transportation Engineering-English Edition","volume":"11 5","pages":"Pages 972-1000"},"PeriodicalIF":7.4,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Potential applications for composite utilization of rubber and plastic in asphalt pavements: A critical review 沥青路面中橡胶和塑料复合利用的潜在应用:严格审查
IF 7.4 2区 工程技术
Journal of Traffic and Transportation Engineering-English Edition Pub Date : 2024-10-01 DOI: 10.1016/j.jtte.2024.04.005
Haibin Li , Lichang Zhou , Yuhang Cai , Yongfei Zhang , Bature Auwal Ibrahim , Zixuan Feng , Liyun Tang , Zhigang Li , Fayong Yang
{"title":"Potential applications for composite utilization of rubber and plastic in asphalt pavements: A critical review","authors":"Haibin Li ,&nbsp;Lichang Zhou ,&nbsp;Yuhang Cai ,&nbsp;Yongfei Zhang ,&nbsp;Bature Auwal Ibrahim ,&nbsp;Zixuan Feng ,&nbsp;Liyun Tang ,&nbsp;Zhigang Li ,&nbsp;Fayong Yang","doi":"10.1016/j.jtte.2024.04.005","DOIUrl":"10.1016/j.jtte.2024.04.005","url":null,"abstract":"<div><div>Waste plastics and rubber have always posed a threat to the environment and a great challenge for disposal. The use of these two waste materials as modifiers for road asphalt provides new road asphalt binders and at the same time provides a new way for waste material resource treatment. Rubber-modified asphalt and plastic-modified asphalt have received widespread attention due to their green and low-carbon characteristics and some performance advantages, but there are still some performance shortcomings that hinder their promotion and application. In order to continue to explore the application of waste materials in the field of road engineering, combined with the performance advantages of both, many scholars began to study the rubber-plastic composite modified asphalt (RPCMA). Therefore, this paper reviewed the different types of waste rubber and plastic, the comprehensive performance of different types of asphalt and its mixture performance, analyzed the modification mechanism of rubber-plastic composite modified asphalt and its performance changes. The results show that rubber-plastic composite modified asphalt is mostly prepared by directly adding modified materials. However, the pretreatment or melt granulation of rubber and plastic will make the performance of rubber-plastic modified asphalt has improved. There is a mutual promotion mechanism between rubber and plastic in asphalt, which makes the performance of rubber-plastic modified asphalt better than that of asphalt obtained by a single modification method (rubber modified asphalt or plastic modified asphalt). In some properties, it can be close to the commercial SBS modified asphalt. The performance of rubber and plastic composite modified asphalt at high temperature has been generally recognized by researchers, but its low-temperature performance is still controversial. Therefore, it is recommended to apply in high-temperature areas. Future work should focus on the development of composite modifiers with stable performance, low cost and ease of use, standardization of modification processes, improvement of low-temperature performance, and monitoring of road performance and environmental impact.</div></div>","PeriodicalId":47239,"journal":{"name":"Journal of Traffic and Transportation Engineering-English Edition","volume":"11 5","pages":"Pages 939-971"},"PeriodicalIF":7.4,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Design equations for maximum stress concentration factors for concrete-filled steel tubular K-joints 混凝土填充钢管 K 型接头最大应力集中系数的设计方程
IF 7.4 2区 工程技术
Journal of Traffic and Transportation Engineering-English Edition Pub Date : 2024-10-01 DOI: 10.1016/j.jtte.2022.07.007
Lei Jiang , Yongjian Liu , Neil A. Hoult , Xin Long , Wenshuai Wang
{"title":"Design equations for maximum stress concentration factors for concrete-filled steel tubular K-joints","authors":"Lei Jiang ,&nbsp;Yongjian Liu ,&nbsp;Neil A. Hoult ,&nbsp;Xin Long ,&nbsp;Wenshuai Wang","doi":"10.1016/j.jtte.2022.07.007","DOIUrl":"10.1016/j.jtte.2022.07.007","url":null,"abstract":"<div><div>Stress concentration factors (SCFs) for welded tubular joints can be decreased by filling the chord with concrete leading to a longer fatigue life. However, there are currently no design formula available in guidelines to predict the SCF of concrete-filled circular hollow section (CFCHS) K-joints, thus limiting their applicability in bridge design. To address this gap, finite element models for CFCHS K-joints were developed and compared against test results to ensure their accuracy. Then, a comprehensive parametric study was conducted to establish relationships between maximum SCFs and four variables: brace-to-chord diameter ratio (<em>β</em>), chord diameter-to-thickness ratio (2<em>γ</em>), brace-to-chord thickness ratio (<em>τ</em>), and the angle between braces and chord (<em>θ</em>). A total of 480 FE models were examined under three loading conditions including brace and chord loading: balanced axial force, chord axial force, and chord bending. Design equations to predict the maximum SCF for CFCHS K-joints were established by multiple regression analyses of the numerical results. A comparison of maximum SCFs between circular hollow section (CHS) and CFCHS K-joints was made, and it was concluded that average reductions of 42% and 33% in maximum SCFs in CFCHS K-joints at the locations of the chord and brace were found compared to CHS joints for balanced axial force, respectively. Finally, a case study illustrating how to use the proposed equations for fatigue safety verification was presented.</div></div>","PeriodicalId":47239,"journal":{"name":"Journal of Traffic and Transportation Engineering-English Edition","volume":"11 5","pages":"Pages 1001-1022"},"PeriodicalIF":7.4,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A review of China's automotive industry policy: Recent developments and future trends 中国汽车产业政策回顾:近期发展和未来趋势
IF 7.4 2区 工程技术
Journal of Traffic and Transportation Engineering-English Edition Pub Date : 2024-10-01 DOI: 10.1016/j.jtte.2024.09.001
Yisong Chen, Xiaofang Dai, Pei Fu, Geng Luo, Peilong Shi
{"title":"A review of China's automotive industry policy: Recent developments and future trends","authors":"Yisong Chen,&nbsp;Xiaofang Dai,&nbsp;Pei Fu,&nbsp;Geng Luo,&nbsp;Peilong Shi","doi":"10.1016/j.jtte.2024.09.001","DOIUrl":"10.1016/j.jtte.2024.09.001","url":null,"abstract":"<div><div>To promote the improvement and development of China's automotive industry policy, this study conducts a systematic review and hierarchical analysis of both domestic and international automotive industry policies. First, the automotive industry policies of the United States, Germany, South Korea, and Japan are summarized in terms of their industrial structure adjustment, technological innovation, taxes and financial subsidies, and infrastructure construction. Benchmarking the policies of international automotive industry powers provides a reference and basis for integrating their experiences in the formulation of China's automotive industry policy. Second, beginning with China's “Automotive Industry Policy” issued in 1994, the key automotive industry policies at different points in history and under different strategies are analyzed. Through policy adjustment and target setting, the changing focus through the historical development of China's automotive industry is determined, along with the development of the industry and technological progress. Then, from the perspectives of strategic planning, promotion and application, credit management, infrastructure, management standards, and standard systems, the advantages and disadvantages of current development policies for new energy and intelligent connected vehicles are clarified. The challenges and limitations of China's automotive industry policy are summarized, including a lack of investment in technology research and development, low level of infrastructure support, and insufficient consumer protection. China's automotive industry policy is then into three different historical stages: i) 1994 to 2008, ii) 2009 to 2013, and iii) 2014 to present; and the characteristics of each stage are summarized. Finally, based on China's national conditions and considering the future development trends of the international automotive industry, the study concludes that under the strong drivers of carbon peak and neutrality goals, China's future automotive industry policy should feature energy saving and emission reduction as the main goals. Independent innovation should be the main enabler, strengthening and supplementing the supply chain through intelligent connectivity.</div></div>","PeriodicalId":47239,"journal":{"name":"Journal of Traffic and Transportation Engineering-English Edition","volume":"11 5","pages":"Pages 867-895"},"PeriodicalIF":7.4,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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