A METHOD FOR THE EXTRACTION OF LONG-TERM DEFORMATION CHARACTERISTICS OF LONG-SPAN HIGH-SPEED RAILWAY BRIDGES USING HIGH-RESOLUTION SAR IMAGES

ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences ◽

10.5194/isprs-archives-xli-b7-35-2016 ◽

2016 ◽

Vol XLI-B7 ◽

pp. 35-38

Author(s):

H. G. Jia ◽

L. Y. Liu

Keyword(s):

High Resolution ◽

High Speed ◽

Control Point ◽

Deformation Monitoring ◽

Structural Deformation ◽

Sar Images ◽

High Speed Railway ◽

Long Span Bridges ◽

Long Span

Natural causes and high-speed train load will result in the structural deformation of long-span bridges, which greatly influence the safety operation of high-speed railway. Hence it is necessary to conduct the deformation monitoring and regular status assessment for long-span bridges. However for some traditional surveying technique, e.g. control-point-based surveying techniques, a lot of human and material resources are needed to perform the long-term monitoring for the whole bridge. In this study we detected the long-term bridge deformation time-series by persistent scatterer interferometric synthetic aperture radar (PSInSAR) technique using the high-resolution SAR images and external digital elevation model. A test area in Nanjing city in China is chosen and TerraSAR-X images and Tandem-X for this area have been used. There is the Dashengguan bridge in high speed railway in this area as study object to evaluate this method. Experiment results indicate that the proposed method can effectively extract the long-term deformation of long-span high-speed railway bridge with higher accuracy.

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Moving Load and Fatigue Analysis of a Long Span High Speed Railway Bridge

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.629.403 ◽

2012 ◽

Vol 629 ◽

pp. 403-408 ◽

Cited By ~ 3

Author(s):

Alessio Pipinato

Keyword(s):

High Speed ◽

Moving Load ◽

Optimal Solution ◽

Fatigue Analysis ◽

Suspension Bridges ◽

Railway Bridge ◽

Structural Shape ◽

High Speed Railway ◽

Long Span Bridges ◽

Long Span

Long span bridges, as cable-stayed and suspension bridges, have gained much popularity in recent decades for their structural shape, efficient use of materials and other optimal solution. A new phase is starting with main span lengths going over thousands of meter. As a matter of fact, small size substructures are required, the development of efficient construction techniques are growing on and faster progress in the FEM and design are evident. Ever since the dramatic collapse of the first examples of such long span structures, as the Tacoma Narrows Bridge in 1940, much attention has been given to the dynamic behavior of these structures. In this paper a moving load analysis performed on a cable stayed high speed railway bridge is presented together with a fatigue analysis of the cable stays, discussed according to the Italian code verification procedure.

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The Long-Span High-Speed Railway Bridges in China

IABSE Symposium Report ◽

10.2749/222137816819258203 ◽

2016 ◽

Vol 106 (14) ◽

pp. 14-15

Author(s):

Zongyu GAO

Keyword(s):

High Speed ◽

High Speed Railway ◽

Railway Bridges ◽

Long Span

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Fast Warning Method for Rigid Hangers in a High-Speed Railway Arch Bridge Using Long-Term Monitoring Data

Journal of Performance of Constructed Facilities ◽

10.1061/(asce)cf.1943-5509.0001097 ◽

2017 ◽

Vol 31 (6) ◽

pp. 04017103 ◽

Cited By ~ 3

Author(s):

Yonghui An ◽

Delong Guan ◽

Youliang Ding ◽

Jinping Ou

Keyword(s):

High Speed ◽

Monitoring Data ◽

High Speed Railway ◽

Arch Bridge ◽

Long Term Monitoring ◽

Term Monitoring

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Defect investigation and replacement implementation of bearings for long-span continuous box girder bridges under operating high-speed railway networks: a case study

Structure and Infrastructure Engineering ◽

10.1080/15732479.2020.1867589 ◽

2021 ◽

pp. 1-16

Author(s):

Fengbo Ma ◽

Huile Li ◽

Shitong Hou ◽

Xuecheng Kang ◽

Gang Wu

Keyword(s):

High Speed ◽

Box Girder Bridges ◽

Box Girder ◽

High Speed Railway ◽

Girder Bridges ◽

Long Span ◽

Railway Networks ◽

Defect Investigation

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Study on bearing structure and joint seismic resistance of large span non-landing arch on high-speed railway station

IABSE Congress, New York, New York 2019: The Evolving Metropolis ◽

10.2749/newyork.2019.2295 ◽

2019 ◽

Author(s):

Liu Chuanping ◽

Tianluan Liu ◽

Jian Jia

Keyword(s):

High Speed ◽

Low Frequency ◽

Large Earthquake ◽

Scale Model ◽

Railway Station ◽

High Speed Railway ◽

Long Span ◽

Weak Component ◽

Double Beam ◽

Cyclic Loading Tests

<p>The main entrance of Chongqing West Railway Station adopts the non-landing compound arch with a span of 108m. In this paper, the nonlinear finite element theory is applied to analyze the bearing capacity and seismic ductility of the compound arch joints. Low frequency cyclic loading tests are performed on the 1/5 scale model. Based on the calculation and test results, a double beam structure and a section of steel truss are placed in the arch joints to bear the force of the arch. Moreover, the buckling-restrained brace (BRB) is placed in the lower part of the arch that enables most force directly transmit to the foundation of the arch. Unlike BRB’s common use as an inter-column support, it now acts as a buckling constraint support in the large earthquake. For instance, it can be yielded before the frame column to improve earthquake resistance. The research results indicate that the compound arch joint structure successfully accomplishes the seismic design goals of strong joints with weak component. Moreover, the study provides the theoretical basis and design reference for the application of BRB and long-span arch structures in high-speed railway station.</p>

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How to balance interfirm relationships? A case from high-speed railway industry

Journal of Business and Industrial Marketing ◽

10.1108/jbim-09-2019-0389 ◽

2020 ◽

Vol 35 (11) ◽

pp. 1785-1799 ◽

Cited By ~ 1

Author(s):

Na Zhang ◽

Xiaopeng Deng ◽

Bon-Gang Hwang ◽

Yanliang Niu

Keyword(s):

High Speed ◽

Superior Performance ◽

Interfirm Relationships ◽

High Speed Railway ◽

Content Type ◽

Railway Industry ◽

Interfirm Cooperation ◽

Relationship Structures ◽

Interfirm Competition

Purpose Balancing interfirm relationships is important for firms’ long-term superior performance. However, prior studies mainly focus on interfirm competition or interfirm cooperation separately, ignoring the balance of interfirm relationships. To bridge this gap in knowledge, this study aims to develop a framework to evaluate the balance of interfirm competition and interfirm cooperation and propose strategies to optimize a firm’s interfirm relationships. Design/methodology/approach After an in-depth literature review, a framework was developed for evaluating and optimizing the interfirm relationships. Taking the high-speed railway industry as an example, the proposed framework was implemented. Findings The results of the case confirm that the balancing of interfirm relationships can lead to more superior firm performance. Also, rather than mutual suppression, the interfirm competition and interfirm cooperation present a roughly positive relationship. Originality/value This study would contribute to the existing knowledge body by developing a framework for balancing interfirm relationships. Also, this study can aid practitioners in evaluating and optimizing their interfirm relationship structures.

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Fatigue Life Characteristics of Segmental Lining Structure for the Shallow Buried Metro Tunnel under the Dynamic Load of a High-Speed Railway

Mathematical Problems in Engineering ◽

10.1155/2018/8736786 ◽

2018 ◽

Vol 2018 ◽

pp. 1-13 ◽

Cited By ~ 2

Author(s):

Wangping Qian ◽

Taiyue Qi ◽

Qing Zhao ◽

Bingrong Pu ◽

Jin Zhang ◽

...

Keyword(s):

Fatigue Life ◽

Fatigue Failure ◽

Dynamic Load ◽

High Speed ◽

Dynamic Loads ◽

High Speed Railway ◽

Segmental Lining ◽

Lining Structure ◽

Metro Tunnel

Shallow buried shield metro tunnels constructed underneath subgrade project of high-speed railways are becoming increasingly common in China, but the lower metro tunnel bears the fatigue effect of dynamic load induced by the upper high-speed railway, so the long-term durability of segmental lining is a nonnegligible problem. The segmental lining structure of metro tunnel is in a state of static-dynamic loads for a long time, especially when a high-speed railway passes above the metro line, and the long-term durability of segmental lining needs further research. Based on theoretical analysis, the effect of different forms of loads on the fatigue life was analyzed, the change law of the static-dynamic loads on segmental lining was summarized, and the method was put forward to evaluate the fatigue life characteristics of segmental lining. The research results reveal that the additional dynamic load is the fundamental reason for the fatigue failure of the structure, and the existence of static load can cause and accelerate the occurrence of structural fatigue failure simultaneously. The results indicate that the fatigue life decreases gradually with the increase of static-dynamic load. Based on coupling analysis of static-dynamic loads of segmental lining, the fatigue life increases first and then decreases with the increase of buried depth of metro tunnel, and it remains unchanged when the depth exceeds a certain value. According to the actual metro tunnel engineering, by using ABAQUS software, a three-dimensional numerical simulation was carried out to analyze the characteristics of the fatigue life and evolution rules of segmental lining. Based on the modified fatigue life formula and metro service life, the optimization design of the buried depth was carried out to determine the most reasonable range of the buried depth. This study provides a valuable reference for safe operation and long-term durability of metro tunnels under high-speed railways.

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Evolution of Rheological Behaviors of Styrene-Butadiene-Styrene/Crumb Rubber Composite Modified Bitumen after Different Long-Term Aging Processes

Materials ◽

10.3390/ma12152345 ◽

2019 ◽

Vol 12 (15) ◽

pp. 2345 ◽

Cited By ~ 2

Author(s):

Yangsheng Ye ◽

Gang Xu ◽

Liangwei Lou ◽

Xianhua Chen ◽

Degou Cai ◽

...

Keyword(s):

Low Temperature ◽

High Speed ◽

Crumb Rubber ◽

Modified Bitumen ◽

High Speed Railway ◽

Modified Asphalt ◽

Styrene Butadiene Styrene ◽

Styrene Butadiene ◽

Butadiene Styrene

In this study, a new type of composite modified bitumen was developed by blending styrene-butadiene-styrene (SBS) and crumb rubber (CR) with a chemical method to satisfy the durability requirements of waterproofing material in the waterproofing layer of high-speed railway subgrade. A pressure-aging-vessel test for 20, 40 and 80 h were conducted to obtain bitumen samples in different long-term aging conditions. Multiple stress creep recovery (MSCR) tests, linear amplitude scanning tests and bending beam rheometer tests were conducted on three kinds of asphalt binders (SBS modified asphalt, CR modified asphalt and SBS/CR composite modified asphalt) after different long-term aging processes, including high temperature permanent deformation performance, resistance to low temperature thermal and fatigue crack. Meanwhile, aging sensitivities were compared by different rheological indices. Results showed that SBS/CR composite modified asphalt possessed the best properties before and after aging. The elastic property of CR in SBS/CR composite modified asphalt improved the ability to resist low temperature thermal and fatigue cracks at a range of low and middle temperatures. Simultaneously, the copolymer network of SBS and CR significantly improved the elastic response of the asphalt SBS/CR modified asphalt at a range of high temperatures. Furthermore, all test results indicated that the SBS/CR modified asphalt possesses the outstanding ability to anti-aging. SBS/CR is an ideal kind of asphalt to satisfy the demand of 60 years of service life in the subgrade of high speed railway.

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