Performance Deterioration of Heavy-Haul Railway Bridges under Fatigue Loading Monitored by a Multisensor System

Yu, Zhiwu; Shan, Zhi; Yuan, Ju Long; Xiao, Li

doi:10.1155/2018/5465391

Cited by 12 publications

(7 citation statements)

References 16 publications

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“…Based on the above, research is conducted in three aspects regarding the adaptability of existing railway steel bridges to heavy hauls and strengthening measures (Sun, 2014; Li & Luo, 2013; Walbridge & Liu, 2018; Cui, Zhang, Bao, Kang, & Bu, 2018; Wang, Wang, Duan, Wang, & Zhai, 2019; Li & Zhang, 2019; Zhang & Li, 2017; Wang, 2016; Zhang & Sun, 2019; Liu & He, 2020; Wang, 2018; Guo & Xu, 2017; Li, 2020; Al-Karawi, 2023; Han, Zhao, & Zhang, 2022; Wallin, Leander, & Karoumi, 2011; Han et al. , 2022; Yu, Shan, Yuan, & Li, 2018; Xiao, Luo, Liu, & Wang, 2020):Overall analysis of the adaptability of existing steel bridge structures to heavy hauls.Evaluation of fatigue life for existing steel bridges.Study of strengthening measures for existing steel bridges.…”

Section: Introductionmentioning

confidence: 99%

Research on heavy-haul adaptive technology and strengthening measures for existing railway steel bridge

2023

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PurposeThis research addresses the diverse characteristics of existing railway steel bridges in China, including variations in construction age, design standards, structural types, manufacturing processes, materials and service conditions. It also focuses on prominent defects and challenges related to heavy transportation conditions, particularly low live haul reserves and severe fatigue problems.Design/methodology/approachThe study encompasses three key aspects: (1) Adaptability assessment: It begins with assessing the suitability of existing railway steel bridges for heavy-haul operations through comprehensive analyses, experiments and engineering applications. (2) Strengthening: To combat frequent crack defects in the vertical stiffener end structure of girder webs, fatigue performance tests and reinforcement scheme experiments were conducted. These experiments included the development of a hot-spot stress S-N curve for this structure, validating the effectiveness of methods like crack stop holes, ultrasonic hammering and flange angle steel. (3) Service life extension: Research on the cruciform welded joint structure (non-fusion transfer type) focused on fatigue performance over the long life cycle. This led to the establishment of a fatigue S-N curve, enhancing Chinese design codes.FindingsThe research achieved several significant outcomes: (1) Successful implementation of strengthening and retrofitting measures on a 64-m single-span double-track railway steel truss girder on an existing heavy-duty line. (2) Post-reinforcement, a substantial 26% to 32% reduction in live haul stress on bridge members was achieved. (3) The strengthening and retrofitting efforts met design expectations, enabling the bridge to accommodate vehicles with a 30-ton axle haul on the railway line.Originality/valueThis research systematically tackles challenges and defects associated with Chinese existing railway steel bridges, providing valuable insights into adaptability assessment, strengthening techniques and service life extension methods. Furthermore, the development of fatigue S-N curves and the successful implementation of bridge enhancements have practical implications for improving the resilience and operational capacity of railway steel bridges in China.

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Section: Introductionmentioning

confidence: 99%

Research on heavy-haul adaptive technology and strengthening measures for existing railway steel bridge

2023

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“…During the operation of high-speed railway, the ballastless track develops cracks, upwarps, and faces other issues under the combined effects of temperature load and rain erosion [1,2]. This not only seriously affects its service performance and leads to a high maintenance cost but also affects its strength, fatigue performance, and stability [3,4].…”

Section: Introductionmentioning

confidence: 99%

Research on the Variable-Temperature Cracking Mechanism of CRTS I Type Double-Block Ballastless Track on a Bridge

et al. 2022

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The CRTS I type double-block ballastless track (CRTS I TDBBT) has the advantages of convenient construction and low cost, but it has low crack resistance and the temperature field distribution of the railway on the bridge is uneven and frequently changes, so it is necessary to study the mechanical properties of the CRTS I TDBBT under the load of a temperature field. The temperature field model of the CRTS I TDBBT on the bridge is established by finite element software, the real-time temperature field of the track bed slab is brought into the coupled model as a load, and the variation laws of the temperature stress of the CRTS I TDBBT under different schemes are compared. The temperature gradient in the CRTS I TDBBT track bed slab has the largest fluctuation range, and the positive and negative temperature gradient range can reach 93.34 °C. For the temperature longitudinal stress around the sleeper block of the track bed slab, the edge is the largest; the temperature longitudinal stress is reduced by at most 5.27% after the anti-cracking diagonal bars are added. When the expansion joint is added, the temperature stress can be reduced by up to 80.29%. The fluctuation range of the temperature gradient of the track bed is basically consistent with the fluctuation range of the local air temperature. The huge temperature difference leads to the occurrence of cracks in the track structure, and cracks are more likely to occur at the corners of the sleeper block. The addition of both anti-crack diagonal bars and expansion joints has an anti-crack effect, but the effect of adding expansion joints is better.

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“…As the train speed and axle load increase, the dynamic geometric deviation of the track under driving conditions may exceed the limit, which will affect the safety of driving [27][28][29][30]. The most reasonable structure form should be considered when designing [31,32], but there are few theoretical studies on this aspect of LVT in the world.…”

Section: Introduction 1engineering Backgroundmentioning

confidence: 99%

Research on Mechanical Performance of Improved Low Vibration Track and Its Feasibility Analysis for Heavy-Haul Railway Applications

et al. 2021

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With the gradual increase of the cargo weight of heavy-haul trains, the traditional ballasted track with the accumulation of stone and ballast has been unable to meet its structural safety requirements. From the comparison of the three common ballastless tracks in China, it can be seen that the low-vibration track (LVT) has the advantages of reasonable structure, low cost, and easy maintenance. Therefore, the design and research of heavy-haul railways are focused on, and it is urgent to study the applicability of LVT in heavy-haul railways. Method: By improving the slope of the short side of the LVT support block, the support block has a better load bearing capacity, so as to achieve the purpose of bearing a larger axle load. Through 1:1 full-scale model test and finite element simulation, the static mechanical properties of Improved LVT (ILVT) and Traditional LVT (TLVT) are compared and analyzed. Result: Compared with TLVT, ILVT has smaller vertical displacement and track gauge changes when subjected to the same load. The proven and reliable finite element model also shows that ILVT’s load sharing is less affected. In the case of achieving the same deformation, ILVT can withstand greater vertical and lateral loads. Conclusions: Compared with the TLVT, the ILVT design can reduce the vertical displacement of the rail and the supporting block, better control the track subsidence, and improve the driving safety of the LVT. At the same time, ILVT improves the anti-overturning ability of the rail and support block under lateral load, reduces the expansion of the gauge and the lateral spacing of the support block, and improves the stability of the track structure. ILVT can also be considered for the weight of 40t and other large axle load, and has broad application prospects.

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Performance Deterioration of Heavy-Haul Railway Bridges under Fatigue Loading Monitored by a Multisensor System

Cited by 12 publications

References 16 publications

Research on heavy-haul adaptive technology and strengthening measures for existing railway steel bridge

Research on heavy-haul adaptive technology and strengthening measures for existing railway steel bridge

Research on the Variable-Temperature Cracking Mechanism of CRTS I Type Double-Block Ballastless Track on a Bridge

Research on Mechanical Performance of Improved Low Vibration Track and Its Feasibility Analysis for Heavy-Haul Railway Applications

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