Article
Engineering, Civil
Jiawang Zhan, Junjie You, Xuan Kong, Nan Zhang
Summary: This study proposes a new method to identify bridge frequencies from vehicles moving at a high speed by combining the responses of multiple vehicles, and verifies the effectiveness of the method through numerical simulations. The influence of track irregularity, vehicle speed, bridge stiffness, and bridge damping on the identification results is also analyzed.
ENGINEERING STRUCTURES
(2021)
Article
Metallurgy & Metallurgical Engineering
Jian Yu, Li-zhong Jiang, Wang-bao Zhou, Xiang Liu
Summary: Railway transportation plays a crucial role in earthquake mitigation and post-earthquake reconstruction. This research focuses on track irregularities caused by earthquakes and proposes a target seismic residual track irregularity based on the distribution mode analysis, along with calculating the driving speed threshold after earthquakes. The findings indicate that transverse earthquakes lead to noticeable alignment irregularities in rails, with smaller amplitudes in vertical irregularities. The distribution mode of alignment irregularities can be categorized into unimodal and bimodal, with the latter showing significantly smaller amplitudes and vehicle responses. It is found that when the peak acceleration of transverse earthquakes is less than 0.25g, no deceleration is needed, while a moderate deceleration is required when it exceeds 0.25g to ensure comfort.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2023)
Article
Environmental Sciences
Dan He, Zixuan Chen, Jing Zhou, Ting Yang, Linlin Lu
Summary: The study found that the opening of high-speed rail has a significant impact on urban expansion, but this effect diminishes over time. Different sizes of cities have different responses to high-speed rail, and the conversion of non-urban land to urban land also varies by city type.
Article
Engineering, Civil
Yu Xiang, Youjun Xie, Guangcheng Long, Jionghuang He
Summary: The volume deformation characteristics of steam-cured concrete can be divided into two stages, with a residual expansion deformation model proposed and its accuracy verified.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Yachuan Kuang, Jiahui Yang, Haiquan Jing, Runan Tian, Kexiang Niu, Zhiwu Yu
Summary: The study investigates the influence of corrosion on the flexural behavior of high-speed railway simply supported prestressed concrete box girders. Experimental and theoretical investigations were conducted, and it was found that corrosion significantly decreases the flexural behavior of the test beams. An analytical model was proposed to predict the flexural behavior of corroded PC beams.
APPLIED SCIENCES-BASEL
(2023)
Article
Green & Sustainable Science & Technology
Chong Ye, Yanhong Zheng, Shanlang Lin, Zhaoyang Zhao
Summary: This study takes the Wuhan-Guangzhou high-speed railway as a case study to analyze the mechanism and impact of high-speed railway opening on regional economic growth. The results show that the accessibility of cities along the line has increased by more than 60% since the opening of the high-speed railway, and it has promoted regional economic growth mainly through increasing the total cargo volume.
Article
Construction & Building Technology
Gang Xu, Jie Zhou, Xianhua Chen, Yilong Liang, Degou Cai, Liangwei Lou
Summary: The study aimed to investigate the impact of temperature changes on the ACWL in winter, analyzing the strain distribution and temperature gradient on the ACWL surface through field tests and numerical modeling. Results showed that the internal temperature gradient in the track structure was most significant at 4:00 a.m in winter, and suggested the use of geotextile to reduce peak tensile strain at base plate joints.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Xin Xiao, Jin Li, Degou Cai, Liangwei Lou, Yuefeng Shi, Feipeng Xiao
Summary: Having a comprehensive understanding of the internal freeze-thaw damage mechanisms in the high-speed railway asphalt concrete waterproofing layer is crucial for maintaining its long-term waterproofing and mechanical performance. In this study, four different composite polymerized railway asphalt mixtures were examined, and the results showed that the internal deterioration was caused by the generation, expansion, and aggregation of voids and micro-cracks. Furthermore, a lag effect of the freeze-thaw damage was observed, and the air void content in the outer shell layer was found to affect the efficiency of this effect. Additionally, all four types of asphalt mixtures demonstrated promising waterproofing performance and freeze-thaw damage resistance, with Binder A and AC-10 mixtures showing superior high-temperature performance and freeze-thaw damage resistance.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Mechanical
Naidan Hou, Renxi Zhao, Jian Li, Xuan Wang, Xi Li, Hao Cui, Yulong Li
Summary: This study investigates the damage caused by rain erosion on aircraft during supersonic flight through high-speed waterjet impact experiments on composite laminates. The experiment and simulation results confirm the effectiveness of the numerical methods used. The study finds that water-hammer pressure, stagnation pressure, and stress wave propagation are the main failure mechanisms for matrix damage in CFRP impacted by waterjets. The velocity and diameter of the waterjets are crucial factors affecting the extent of damage on CFRP.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2022)
Article
Engineering, Mechanical
Chaozhi Ma, Liang Gao, Rixin Cui, Tao Xin
Summary: The study established a multi-vehicle-track coupled dynamic model to investigate the mechanism and distribution of high-order polygonal wear, identifying the impact of rail bending modes and explaining the distribution rule related to seasonality and wheelset position.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Engineering, Mechanical
Kodai Matsuoka, Munemasa Tokunaga, Kiyoyuki Kaito
Summary: This study established a TV-ARX model and Bayesian TV-ARX method to estimate the reduction in bridge stiffness caused by crack opening during the passage of trains, providing a new approach for structural monitoring and maintenance of PC bridges.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Mechanics
Paul Koenig, Christoph Adam
Summary: In this paper, a dynamic interaction model of the coupled system of railway bridge, foundation, subsoil, ballast, track, and high-speed train is presented. The model focuses on the longitudinal interaction between the track and the bridge structure, considering the flexibility of the ballast. The coupling of the bridge structure with the track is achieved using component mode synthesis technique.
Article
Engineering, Mechanical
Yahang Qin, Shoune Xiao, Liantao Lu, Bing Yang, Tao Zhu, Guangwu Yang
Summary: This study examines the fatigue failure laws of dropper structures through impact fatigue tests and local simulation analyses. The failure modes of droppers with different structures are investigated and the reasons for the differences are discussed. It is found that the tooth-shaped crimping dropper causes significant initial damage to the copper wire surface, resulting in reduced load-bearing capacity. On the other hand, the elliptical crimping dropper experiences crack initiation and structural fracture failure due to high tensile stress along the edge. The study also reveals linear relationships between impact load and life for both types of droppers under double logarithmic coordinates.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Engineering, Civil
Jin Li, Xin Xiao, Degou Cai, Liangwei Lou, Yuefeng Shi, Feipeng Xiao
Summary: The asphalt concrete waterproofing layer is crucial for preventing water infiltration and ensuring the durability of high-speed railways. Composite polymerized asphalt materials, with the use of SBS and HVR, have shown satisfactory waterproofing performance and improved resistance to high temperatures and freeze-thaw cycles.
TRANSPORTATION GEOTECHNICS
(2022)
Article
Green & Sustainable Science & Technology
Weike Zhang, Ming Zeng, Yufeng Zhang, Chi-Wei Su
Summary: The development of high-speed railway in China is beneficial for reducing carbon emissions. The study shows that high-speed railway can decrease carbon emissions by an average of 2.3%, with the reduction effects mainly concentrated in northern cities, central and western regions, and large-scale cities. However, other types of cities do not show reduction effects and even experience an increase in carbon emissions.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Engineering, Mechanical
Luis Castejon, Jesus Cuartero, David Valladares, Hugo Malon, Carlos Martin, Carlos Fabra
INTERNATIONAL JOURNAL OF HEAVY VEHICLE SYSTEMS
(2016)
Article
Materials Science, Multidisciplinary
Narciso Tolosana, David Ranz, Oscar Gracia, Jesus Cuartero, Antonio Miravete
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2016)
Article
Materials Science, Multidisciplinary
David Ranz, Jesus Cuartero, Luis Castejon, Ramon Miralbes
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2020)
Article
Materials Science, Multidisciplinary
Julio Vidal, David Ponce, Antonio Miravete, Jesus Cuartero, Pere Castell
Summary: By using humins as a bio-binder, the interaction between natural fibers and epoxy resin can be improved, enhancing the mechanical properties of bio-composites and accelerating their market acceptance.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2021)
Article
Engineering, Mechanical
L. Tello, L. Castejon, H. Malon, D. Valladares, P. Luque, Daniel A. Mantaras, D. Ranz, J. Cuartero
ENGINEERING FAILURE ANALYSIS
(2020)
Article
Engineering, Electrical & Electronic
H. Malon, A. Ayuda, F. J. Garcia-Ramos, M. Vidal, J. Cuartero
JOURNAL OF SENSORS
(2020)
Article
Mechanics
David Ranz, Jesus Cuartero, Luis Castejon, Ramon Miralbes, Hugo Malon
COMPOSITE STRUCTURES
(2020)
Article
Engineering, Mechanical
David Valladares, Luis Castejon, Esus Cuartero, Hugo Malon, David Ranz Angulo, Stefan Ilijevic, Xavier Agustin
Summary: This article presents an experimental-numerical analysis on a new automotive component with a sandwich structure made of steel skins and a rigid foam core. The objective was to achieve a lighter yet stiffer and stronger C-pillar within the same price range as the reference component.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
David Ranz, Jesus Cuartero, Luis Castejon, Ramon Miralbes, David Valladares
Summary: This paper proposes an enhanced Cohesive Zone Model (CZM) to predict delamination in curved beams. The model takes into account the fiber-bridging phenomenon and the variation of element size in the curved zone. By comparing with experimental results, the advantages of this model are highlighted.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Chemistry, Physical
Agata Poniecka, Marcin Barburski, David Ranz, Jesus Cuartero, Ramon Miralbes
Summary: The study demonstrates that using technical embroidery as a composite reinforcement increases its tensile strength. Additionally, embroidery as a vertical reinforcement of the composite prevents the formation of interlayer cracks. The technology of technical embroidery allows for optimizing the mechanical values of the composite reinforcement.
Article
Materials Science, Multidisciplinary
R. Miralbes, J. Cuartero, D. Ranz, N. Correia
Summary: Numerical simulations are crucial for predicting the mechanical properties of gyroids in this study. Three methods, including shell elements, solid elements, and homogenization, were explored. The results indicate that homogenization can only provide properties in the elastic zone, while solid models can also determine behaviors in the plateau zone and densification point. The shell elements model predicts the elastic behavior and stress levels in the plateau zone, but with lower accuracy compared to the solid element model, and it cannot predict the densification point.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Materials Science, Composites
Julio Vidal, Carlos Hornero, Ruth Garcia, Jesus Cuartero, Anne Beaucamp, Maurice N. Collins, Lidia Garcia, David Ponce, Mari Carme Royo, Elisabeth Sanchez, Pere Castell
Summary: This research aims to integrate reversible chemistries in advanced carbon fiber-reinforced composites for sustainable recycling. The study shows that diene and dienophile reactions on the fiber surface allow bond-debond interactions with the epoxy matrix, effectively modifying the resin's properties. The newly developed interphase chemistry has a significant impact on the crosslinking efficiency and interlaminar properties of the resin.
POLYMER COMPOSITES
(2023)
Article
Engineering, Multidisciplinary
Jesus Cuartero, David Ranz, Hugo Malon
Summary: This study investigates the formation of blisters caused by the penetration of water vapor in gel-coat protected laminates within a marine environment, and its influence on various manufacturing process defects.
Article
Engineering, Multidisciplinary
David Ranz, Jesus Cuartero, Lorenzo Rodriguez, Ramon Miralbes, Jose-Antonio Gomez
Summary: This study conducts an in-depth analysis of the influence of manufacturing parameters on the behavior of PETG and carbon fiber reinforced materials, which have better mechanical properties than PLA and ABS. Experimental characterization of interlaminar fracture is performed to acquire a better understanding of the material and generate a behavior model that considers the effects of manufacturing parameters. A finite element numerical model is developed using cohesive elements to simulate layer contact zones and incorporate failure and degradation modes. The model's properties and adjustments are supported by experimental results. The authors propose a series of graphs for selecting properties in the model based on manufacturing parameters for future applications.
Article
Mechanics
David Ranz, Jesus Cuartero, Antonio Miravete, Ramon Miralbes
COMPOSITE STRUCTURES
(2017)
