Pub Date : 2022-09-04DOI: 10.1080/23248378.2022.2118183
Li Wang, Shaoguang Li, Ping Wang, Rong Chen, Zili Li
ABSTRACT The continuous homogeneous rail constraint of embedded rail system (ERS) is realized by the encapsulation of rails with the elastic poured compound (EPC) which is a composite material. Previous treatment of EPC as linear elastic material was insufficient in the failure analysis of ERS. In this work, a hyperelastic model is developed to describe the mechanical properties of the EPC with engineering strain up to 150%. Physical tests of uniaxial tension, planar tension and quadruple shear are conducted. A 4-parameter Ogden model is determined by curve fitting and validated with a progressive validation strategy, and then is applied to the failure analysis of ERS. It is found that the material nonlinearity of EPC contributes noticeably to the decrease of the longitudinal stiffness of ERS. The 2nd debonding is more probably caused by the failure of adhesive at the interface between EPC and rail rather than EPC itself.
{"title":"Rational hyperelastic modelling of elastic poured compound for the failure analysis of embedded rail system","authors":"Li Wang, Shaoguang Li, Ping Wang, Rong Chen, Zili Li","doi":"10.1080/23248378.2022.2118183","DOIUrl":"https://doi.org/10.1080/23248378.2022.2118183","url":null,"abstract":"ABSTRACT The continuous homogeneous rail constraint of embedded rail system (ERS) is realized by the encapsulation of rails with the elastic poured compound (EPC) which is a composite material. Previous treatment of EPC as linear elastic material was insufficient in the failure analysis of ERS. In this work, a hyperelastic model is developed to describe the mechanical properties of the EPC with engineering strain up to 150%. Physical tests of uniaxial tension, planar tension and quadruple shear are conducted. A 4-parameter Ogden model is determined by curve fitting and validated with a progressive validation strategy, and then is applied to the failure analysis of ERS. It is found that the material nonlinearity of EPC contributes noticeably to the decrease of the longitudinal stiffness of ERS. The 2nd debonding is more probably caused by the failure of adhesive at the interface between EPC and rail rather than EPC itself.","PeriodicalId":48510,"journal":{"name":"International Journal of Rail Transportation","volume":" ","pages":""},"PeriodicalIF":4.0,"publicationDate":"2022-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46083692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-22DOI: 10.1080/23248378.2022.2113923
Bingguang Wen, Shenghua Wang, G. Tao, Jiaxin Li, Dexiang Ren, Z. Wen
ABSTRACT Rail side wear is typically encountered in metro lines (particularly on sharp curves). A reliable rail wear prediction model to evaluate the evolution of the rail profile should be developed. In this study, a rail wear prediction model for a metro line is established. The vehicle system dynamics model is implemented in the SIMPACK software, which considers the actual operating conditions of the metro line. The results show that using the original Tγ/A wear rate function to calculate rail wear may yield some deviations, which necessitates a modification of the wear model based on the measured results of rail wear. Because the hardness of high and low rails on curved tracks changes after work hardening, different correction coefficients must be adopted for the wear rate function of each rail. The rail wear evolution and worn profiles are consistent with the field measurement results when using a modified wear function.
{"title":"Prediction of rail profile evolution on metro curved tracks: wear model and validation","authors":"Bingguang Wen, Shenghua Wang, G. Tao, Jiaxin Li, Dexiang Ren, Z. Wen","doi":"10.1080/23248378.2022.2113923","DOIUrl":"https://doi.org/10.1080/23248378.2022.2113923","url":null,"abstract":"ABSTRACT Rail side wear is typically encountered in metro lines (particularly on sharp curves). A reliable rail wear prediction model to evaluate the evolution of the rail profile should be developed. In this study, a rail wear prediction model for a metro line is established. The vehicle system dynamics model is implemented in the SIMPACK software, which considers the actual operating conditions of the metro line. The results show that using the original Tγ/A wear rate function to calculate rail wear may yield some deviations, which necessitates a modification of the wear model based on the measured results of rail wear. Because the hardness of high and low rails on curved tracks changes after work hardening, different correction coefficients must be adopted for the wear rate function of each rail. The rail wear evolution and worn profiles are consistent with the field measurement results when using a modified wear function.","PeriodicalId":48510,"journal":{"name":"International Journal of Rail Transportation","volume":" ","pages":""},"PeriodicalIF":4.0,"publicationDate":"2022-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46869457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ABSTRACT Modelling passenger and train traffic is a significant approach to evaluate the performance of urban rail transit (URT) networks. However, the heavy computation pressure caused by high-efficiency requirements, massive passengers, and high network complexity makes it more challenging to integrate passenger and train traffic simulation into a unified model. We propose an efficient multi-agent model to simultaneously simulate passenger and train traffic in the URT network. The model framework comprises several agents, including passenger batch, train, line, and network. A passenger aggregation method is proposed to release the computation pressure. The model is tested in the URT network of Chongqing, China. The experiment results show the model can handle a 1.6 million passengers, 1900 trains simulation within 86 s, without losing any passengers’ specific travel spatial and temporal trajectory. Three experiments are conducted for further validation, including analysing the transportation performance under different passenger route assignments, train headways, and AFC data, respectively.
{"title":"A hybrid framework for synchronized passenger and train traffic simulation in an urban rail transit network","authors":"Hongxiang Zhang, Gongyuan Lu, Yuanzheng Lei, Guangyuan Zhang, Irene Niyitanga","doi":"10.1080/23248378.2022.2109522","DOIUrl":"https://doi.org/10.1080/23248378.2022.2109522","url":null,"abstract":"ABSTRACT Modelling passenger and train traffic is a significant approach to evaluate the performance of urban rail transit (URT) networks. However, the heavy computation pressure caused by high-efficiency requirements, massive passengers, and high network complexity makes it more challenging to integrate passenger and train traffic simulation into a unified model. We propose an efficient multi-agent model to simultaneously simulate passenger and train traffic in the URT network. The model framework comprises several agents, including passenger batch, train, line, and network. A passenger aggregation method is proposed to release the computation pressure. The model is tested in the URT network of Chongqing, China. The experiment results show the model can handle a 1.6 million passengers, 1900 trains simulation within 86 s, without losing any passengers’ specific travel spatial and temporal trajectory. Three experiments are conducted for further validation, including analysing the transportation performance under different passenger route assignments, train headways, and AFC data, respectively.","PeriodicalId":48510,"journal":{"name":"International Journal of Rail Transportation","volume":" ","pages":""},"PeriodicalIF":4.0,"publicationDate":"2022-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48464586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-03DOI: 10.1080/23248378.2022.2108151
Fuguang Zhang, Jianmei Chang, H. Feng
ABSTRACT This paper evaluates the effect of crumb rubber (CR) on degradation reduction of ballast aggregates subjected to impact loads. A drop-weight impact testing apparatus was developed to test ballast mixed with CR. The probability of corner breakage and bulk fracture was investigated, and the material loss and change in sphericity were identified. The results show that, as CR percentage increases, the corner breakage probability increases first and then decreases, while the bulk fracture probability decreases. The effect of CR on the former is less than that on the latter. The degradation probability of the particles in the size range of 35.5 ~ 45 mm or that of non-cubic shapes is most influenced by CR. The material loss and change in sphericity decrease with increasing CR percentage, and the effect of CR is greatest for the particles in the size range of 25 ~ 35.5 mm and independent of particle shape.
{"title":"Laboratory study on degradation of ballast mixed with crumb rubber under impact loads","authors":"Fuguang Zhang, Jianmei Chang, H. Feng","doi":"10.1080/23248378.2022.2108151","DOIUrl":"https://doi.org/10.1080/23248378.2022.2108151","url":null,"abstract":"ABSTRACT This paper evaluates the effect of crumb rubber (CR) on degradation reduction of ballast aggregates subjected to impact loads. A drop-weight impact testing apparatus was developed to test ballast mixed with CR. The probability of corner breakage and bulk fracture was investigated, and the material loss and change in sphericity were identified. The results show that, as CR percentage increases, the corner breakage probability increases first and then decreases, while the bulk fracture probability decreases. The effect of CR on the former is less than that on the latter. The degradation probability of the particles in the size range of 35.5 ~ 45 mm or that of non-cubic shapes is most influenced by CR. The material loss and change in sphericity decrease with increasing CR percentage, and the effect of CR is greatest for the particles in the size range of 25 ~ 35.5 mm and independent of particle shape.","PeriodicalId":48510,"journal":{"name":"International Journal of Rail Transportation","volume":"11 1","pages":"767 - 789"},"PeriodicalIF":4.0,"publicationDate":"2022-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42617972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-31DOI: 10.1080/23248378.2022.2107581
Qing Wu, C. Cole, M. Spiryagin, E. Bernal, Peng-fei Liu
ABSTRACT This paper developed a track model called the ‘Loop Track’ that had a new function to simulate infinite long tracks without heavy data movement. The model was three-dimensional and considers rails, sleepers, ballast, subballast, and subgrade. Rails were modelled by using the Finite Element Method whilst all other components were modelled as equivalent rigid bodies connected by flexible force elements. The loop or infinite feature of the model was achieved by adding an extra boundary section to link the last node set to the first node set of the original track model. Case studies were conducted to simulate infinite long tracks and variable track conditions, as well as to determine the minimum track length required for different simulations. Results show that the recommended minimum track lengths for the simulated cases were 76 sleepers for vertical track dynamics and 301 sleepers for longitudinal track dynamics.
{"title":"Loop track: an infinite long track model","authors":"Qing Wu, C. Cole, M. Spiryagin, E. Bernal, Peng-fei Liu","doi":"10.1080/23248378.2022.2107581","DOIUrl":"https://doi.org/10.1080/23248378.2022.2107581","url":null,"abstract":"ABSTRACT This paper developed a track model called the ‘Loop Track’ that had a new function to simulate infinite long tracks without heavy data movement. The model was three-dimensional and considers rails, sleepers, ballast, subballast, and subgrade. Rails were modelled by using the Finite Element Method whilst all other components were modelled as equivalent rigid bodies connected by flexible force elements. The loop or infinite feature of the model was achieved by adding an extra boundary section to link the last node set to the first node set of the original track model. Case studies were conducted to simulate infinite long tracks and variable track conditions, as well as to determine the minimum track length required for different simulations. Results show that the recommended minimum track lengths for the simulated cases were 76 sleepers for vertical track dynamics and 301 sleepers for longitudinal track dynamics.","PeriodicalId":48510,"journal":{"name":"International Journal of Rail Transportation","volume":" ","pages":""},"PeriodicalIF":4.0,"publicationDate":"2022-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47077058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-27DOI: 10.1080/23248378.2022.2105268
Song Xiao, Hao Hou, Y. Jin, Guoqiang Gao, Yujun Guo, Jie Zhou, Changlei Ju, Yixiang Shen, Jie Liu, Siyan Chen, Guangning Wu
ABSTRACT Due to the constant pursuit for higher operating velocity, the traction power capacity for high-speed trains needs to be enlarged. When the train passes approach the insulating sections set between the two neighbouring contact lines carrying the traction current with different phases, the vehicle-mounted vacuumed circuit breaker (VCB) needs to be switched off. Generally, the arc may generate when connecting or separating the contacts, when switching on or off the VCB. In order to investigate the characteristics of the reignition overvoltage the ‘train-rail-catenary’ traction power supply model considering the reignition process between the VCB’s contacts is launched in this paper. The impact of the dielectric strength recovery rate between the contacts of the VCB on the number of reignition and the amplitude of the reignition overvoltage is analysed based on the experimental and simulation results. Ultimately, the corresponding restraining measures are proposed for suppressing the reignition overvoltage.
{"title":"Characteristic analysis of the VCB operational overvoltage for high-speed trains considering arc reignition phenomenon","authors":"Song Xiao, Hao Hou, Y. Jin, Guoqiang Gao, Yujun Guo, Jie Zhou, Changlei Ju, Yixiang Shen, Jie Liu, Siyan Chen, Guangning Wu","doi":"10.1080/23248378.2022.2105268","DOIUrl":"https://doi.org/10.1080/23248378.2022.2105268","url":null,"abstract":"ABSTRACT Due to the constant pursuit for higher operating velocity, the traction power capacity for high-speed trains needs to be enlarged. When the train passes approach the insulating sections set between the two neighbouring contact lines carrying the traction current with different phases, the vehicle-mounted vacuumed circuit breaker (VCB) needs to be switched off. Generally, the arc may generate when connecting or separating the contacts, when switching on or off the VCB. In order to investigate the characteristics of the reignition overvoltage the ‘train-rail-catenary’ traction power supply model considering the reignition process between the VCB’s contacts is launched in this paper. The impact of the dielectric strength recovery rate between the contacts of the VCB on the number of reignition and the amplitude of the reignition overvoltage is analysed based on the experimental and simulation results. Ultimately, the corresponding restraining measures are proposed for suppressing the reignition overvoltage.","PeriodicalId":48510,"journal":{"name":"International Journal of Rail Transportation","volume":"11 1","pages":"790 - 810"},"PeriodicalIF":4.0,"publicationDate":"2022-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43507763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ABSTRACT The sleeper group, composed of a certain number of rail sleepers, influences the characterization of lateral resistance and the stability of continuous welded rail (CWR). According to full-scale model tests and discrete element model simulation tests of ballast bed, we established a new lateral stability analysis model of CWR considering the effect of sleeper group and resistance sharing characteristics, and compared it with the traditional model. The case analysis shows that the lateral stability analysis result of CWR is safer when considering the effect of sleeper group. When the curve radius is 300 m, the safety margin of the sleeper group model is about 20.8% larger than that of the traditional model. For CWR with potential large lateral displacement in special sections (such as small-radius and large temperature difference), it is advisable to consider the effect of sleeper group for the lateral stability analysis.
{"title":"The sleeper group influences on lateral resistance and stability of ballast bed","authors":"Yi Xu, Jie-ling Xiao, Tianheng Jiang, Liyuan Zhuang, Pu-Han Jing, Ping Wang, Tianyou Qi","doi":"10.1080/23248378.2022.2106318","DOIUrl":"https://doi.org/10.1080/23248378.2022.2106318","url":null,"abstract":"ABSTRACT The sleeper group, composed of a certain number of rail sleepers, influences the characterization of lateral resistance and the stability of continuous welded rail (CWR). According to full-scale model tests and discrete element model simulation tests of ballast bed, we established a new lateral stability analysis model of CWR considering the effect of sleeper group and resistance sharing characteristics, and compared it with the traditional model. The case analysis shows that the lateral stability analysis result of CWR is safer when considering the effect of sleeper group. When the curve radius is 300 m, the safety margin of the sleeper group model is about 20.8% larger than that of the traditional model. For CWR with potential large lateral displacement in special sections (such as small-radius and large temperature difference), it is advisable to consider the effect of sleeper group for the lateral stability analysis.","PeriodicalId":48510,"journal":{"name":"International Journal of Rail Transportation","volume":"11 1","pages":"732 - 747"},"PeriodicalIF":4.0,"publicationDate":"2022-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43124513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-26DOI: 10.1080/23248378.2022.2106599
Xianying Zhang, D. Thompson, J. Ryue, Hongseok Jeong, G. Squicciarini
ABSTRACT Rail shields have been developed recently which are fitted around the lower part of the rail and are intended to reduce the noise radiated by the rail. Their effect on the sound radiation is investigated theoretically by using a 2.5D finite element/boundary element approach including the acoustic effects of the ground. The insertion loss due to the rail shields is predicted and compared with available measured data and the most important features of the shields are identified. The overall noise reduction when applied to railway track is determined by combining the numerical results with estimates of rolling noise from the TWINS model. The rail shields are effective in the middle frequency range, where the rail is the most important noise source. The overall A-weighted sound level is reduced by 2–3 dB for a track with soft rail pads, and 1–2 dB for a track with stiff pads.
{"title":"The effect of rail shields on railway rolling noise","authors":"Xianying Zhang, D. Thompson, J. Ryue, Hongseok Jeong, G. Squicciarini","doi":"10.1080/23248378.2022.2106599","DOIUrl":"https://doi.org/10.1080/23248378.2022.2106599","url":null,"abstract":"ABSTRACT Rail shields have been developed recently which are fitted around the lower part of the rail and are intended to reduce the noise radiated by the rail. Their effect on the sound radiation is investigated theoretically by using a 2.5D finite element/boundary element approach including the acoustic effects of the ground. The insertion loss due to the rail shields is predicted and compared with available measured data and the most important features of the shields are identified. The overall noise reduction when applied to railway track is determined by combining the numerical results with estimates of rolling noise from the TWINS model. The rail shields are effective in the middle frequency range, where the rail is the most important noise source. The overall A-weighted sound level is reduced by 2–3 dB for a track with soft rail pads, and 1–2 dB for a track with stiff pads.","PeriodicalId":48510,"journal":{"name":"International Journal of Rail Transportation","volume":"11 1","pages":"552 - 572"},"PeriodicalIF":4.0,"publicationDate":"2022-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44924568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ABSTRACT A monitoring project was implemented in trial sections of the Watang−Rizhao heavy-haul railway. Data were acquired at instrumented track formations and railway retaining wall during 30 passages of train at operating speeds ranging from 5 km/h to 100 km/h. At the formation level, earth pressure cells were mounted beneath 10 longitudinally adjacent sleepers, one of which was installed along with two integrated vibration sensors for vertical acceleration and deflection measurements. The retaining wall was instrumented at different elevations in examining its vibration characteristics and variation in earth pressure against the wall due to train passage. Statistical analysis was performed on peak values of observed data to assess train speed impact on the dynamic response of the earth substructures. This field study provides researchers and practitioners with comprehensive data pertaining to the dynamic performance evaluation of track foundations supported by retaining structures under a maximum axle load of 30 tons.
{"title":"Monitoring the dynamic response of track formation with retaining wall to heavy-haul train passage","authors":"Guishuai Feng, Liang Zhang, Q. Luo, Teng-fei Wang, Hongwei Xie","doi":"10.1080/23248378.2022.2103849","DOIUrl":"https://doi.org/10.1080/23248378.2022.2103849","url":null,"abstract":"ABSTRACT A monitoring project was implemented in trial sections of the Watang−Rizhao heavy-haul railway. Data were acquired at instrumented track formations and railway retaining wall during 30 passages of train at operating speeds ranging from 5 km/h to 100 km/h. At the formation level, earth pressure cells were mounted beneath 10 longitudinally adjacent sleepers, one of which was installed along with two integrated vibration sensors for vertical acceleration and deflection measurements. The retaining wall was instrumented at different elevations in examining its vibration characteristics and variation in earth pressure against the wall due to train passage. Statistical analysis was performed on peak values of observed data to assess train speed impact on the dynamic response of the earth substructures. This field study provides researchers and practitioners with comprehensive data pertaining to the dynamic performance evaluation of track foundations supported by retaining structures under a maximum axle load of 30 tons.","PeriodicalId":48510,"journal":{"name":"International Journal of Rail Transportation","volume":"11 1","pages":"748 - 766"},"PeriodicalIF":4.0,"publicationDate":"2022-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47476642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-17DOI: 10.1080/23248378.2022.2099992
Emil Aggestam
ABSTRACT Railways employ a range of different railway track forms. Here, a ballasted track design is compared to three different slab track solutions. The track designs are compared using both a life cycle analysis (LCA) and a methodology for simulation of three-dimensional vertical dynamic vehicle–track interaction, which has been verified versus field measurements. The interaction between vehicle and track is simulated in the time domain using an extended state-space vector approach. For the investigated load cases involving representative wheel and track irregularities, it is concluded that the maximum stress in the concrete parts is, for all designs, below the maximum flexural tensile strength. From the LCA, it is concluded that the production of steel and concrete cause most CO2 emissions, while the CO2 emissions due to maintenance activities such as tamping and rail grinding are only a small part of the overall emissions.
{"title":"Comparison of the dynamic response and environmental impact between traditional and innovative railway track systems","authors":"Emil Aggestam","doi":"10.1080/23248378.2022.2099992","DOIUrl":"https://doi.org/10.1080/23248378.2022.2099992","url":null,"abstract":"ABSTRACT Railways employ a range of different railway track forms. Here, a ballasted track design is compared to three different slab track solutions. The track designs are compared using both a life cycle analysis (LCA) and a methodology for simulation of three-dimensional vertical dynamic vehicle–track interaction, which has been verified versus field measurements. The interaction between vehicle and track is simulated in the time domain using an extended state-space vector approach. For the investigated load cases involving representative wheel and track irregularities, it is concluded that the maximum stress in the concrete parts is, for all designs, below the maximum flexural tensile strength. From the LCA, it is concluded that the production of steel and concrete cause most CO2 emissions, while the CO2 emissions due to maintenance activities such as tamping and rail grinding are only a small part of the overall emissions.","PeriodicalId":48510,"journal":{"name":"International Journal of Rail Transportation","volume":"11 1","pages":"685 - 704"},"PeriodicalIF":4.0,"publicationDate":"2022-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46675539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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