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International Conference on Smart City and Systems Engineering (ICSCSE)

作者： Mi Zhou Hang Zeng State Key Laboratory for Old Bridge Detection and Reinforcement Technology of Ministry of Transportation Chang'an University Xi'an China

ISBN: (纸本)9781728113678;9781728113661

This paper introduces five splicing methods between the precast columns and the cap beam or footing: Wet Joint connection, socket connection, grouted splice sleeve connection, grouted ducts connection, UHPC connection, and the grouted ducts connection between each section of the column, reviewing various types of connection structure, construction characteristics and seismic performance from two aspects of experimental research and engineering application, in order to provide reference for domestic research peers and promote the application of the precast column system with the same effect as the cast-in-place column (CIP) in China.

关键词： bridges Bars Sockets Plastics Steel Fasteners Ducts

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Analysis of the Influence of Boundary Conditions on the Mechanical Characteristics of Arch bridge with Composite Arch

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IOP Conference Series: Earth and Environmental Science 2020年第5期446卷

作者： Changchang Li Ling-Ling Wu Shengbo Chai Yu Zhao Yong-Jun Zhou School of Highway Chang'an University Xi'an 710064 China School of Architecture and Civil Engineering Xi'an University of Science and Technology Xi'an 710054 China Key Laboratory for old Bridge Detection and Reinforcement Technology of Ministry of Transportation Xi'an 710064 China

Mid-through arch bridge with a composite arch rib of the main arch and vice-arch is novel and reliable in rigidity. It belongs to the high-order statically indeterminate structures, and the boundary form has a great influence on the internal force and deflection of the structure. In this paper, in order to study the influence of different boundary conditions on the static and dynamic characteristics of the structure, relying on a practical project, the static and dynamic characteristics of the bridge under different boundary conditions of the main arch foot are analyzed and compared by using finite element method, which provides scientific basis for the design of the arch bridge with composite arch. The results show that the boundary conditions of the main arch foot have obvious effects on the deflection and internal force of the arch under dead and moving loads, but have little effect on the dynamic characteristics and stability of the bridge.

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External parameters analysis of the shrinkage and creep on wide deck and curved extradosed cable-stayed bridge

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Revista de la Facultad de Ingenieria 2017年第1期32卷 316-323页

作者： Feng, Yang Song, Yifan Feng, Mingshuo School of Highway Chang'an University Xi'an710064 China Key Laboratory of Old Bridge Detection and Reinforcement Technique Ministry of Transport Xi'an710064 China Kaifeng Tongda Highway Investigation and Design Co. Ltd Kaifeng475003 China

In order to analyze the influence of the shrinkage and creep on structure performance of wide deck and curved extra-dosed cable-stayed bridge. Based on the Huanglong bridge and the finite element theory, considering the influence of relative humidity, loading age, pre-stressing force, the parameters of relative humidity selected 45%-95%, the parameters of loading age selected 3 days -14 days, the parameters of pre-stressing force selected 65%-85%, analyzes the change trend of mid-span deflection, mid-span bending moment, pounding bottom bending moment in finished bridge state, three years after the state, ten years after the state. The research results show that: in the low range of parameters,the influence of pre-stressing force on the structure is remarkable, and the linear effect is outstanding; in the higher range of parameters, the influence of relative humidity parameters on the structure is remarkable, and the nonlinear effect is outstanding; the influence of loading age on the structure has certain nonlinear effect.

关键词： Loading

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The Analysis of Interface Normal Stress of Short Column of Square Concrete-Filled Steel Tube with Axial Compression

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IOP Conference Series: Earth and Environmental Science 2019年第1期283卷

作者： Zhengqi Zhang Yongjian Liu Zhiheng Zhang Gao Cheng School of Highway Chang'an University Xi'an Shaanxi Province China Shaanxi Provincial Major Laboratory for Highway Bridge & Tunnel Xi'an Shaanxi Province China Key Laboratory of Bridge Detection Reinforcement Technology Ministry of Communications Xi'an Shaanxi Province China

The interface normal stress reflects the interaction between the steel tube and the concrete in the tube, which is helpful to distinguish the time and size that begin to appear confinement effect of the concrete filled steel tube. The typical CFST members in engineering applications may be loaded such as loading through the whole cross section, loading through steel alone and loading through concrete alone, etc. Establishing nonlinear finite element model to analyse the interface normal stress between steel and concrete along the section width, short column height and with the change of axial compressive load, the results show that the different loading mode of CFST column interface normal stress along the width of the cross section showed a 'trough' distribution, but the value is different, sorted by size in descending order is loading through concrete alone, loading through the whole cross section, loading through concrete alone. When steel tube and concrete are subjected to loads, the effective length of steel tube confined concrete is about 0.55 times the width of the section, and the normal stress of the interface is almost 0 in the unconstrained area after 0.5 times of the ultimate load.

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The improvement of gray system theory based on Kalman's filtering method and its application in extradosed cable-stayed bridge construction control

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C e Ca 2017年第1期42卷 82-85页

作者： Feng, Yang Feng, Mingshuo Song, Yifan School of Highway Chang'an University Xi'an710064 China Kaifeng Tongda Highway Investigation and Design Co. Ltd Kaifeng475003 China Key Laboratory of Old Bridge Detection and Reinforcement Technique Ministry of Transport Chang'an University Xi'an710064 China

In the construction of extradosed cable-stayed bridge, the measured deflection values are often different from design value. As a solution, the grey system theory was modified by Kalman's filtering method and was applied in the field deflection prediction. We analyzed the actual measurement data set and predicted the adjustment values of deflection gradually in the construction process, so as to meet the design requirements of extradosed cable-stayed bridge structure and to achieve the design requirements of flexure and internal force state. In order to verify the accuracy of the improved calculation model, the original grey system theory and the modified one using Kalman's filtering method are adopted in the deflection prediction based on the actual extra dosed cable-stayed bridge. Experimental results show that the revised grey system theory based on Kalman's filtering method can effectively reduce the deviation between predicted values and measured ones, reducing the deviation of bridge linear from the design one as well.

关键词： Cable stayed bridges

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Comparison and Applicability Research of Prestressed Duct Pumpness Contemporary Major Nondestructive detection technology

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IOP Conference Series: Materials Science and Engineering 2018年第4期439卷

作者： Jianzhang Chen Kechao Zhang Yi Zheng Research Institute of Highway Ministry Transport Beijing 10088 China Key Laboratory of Old Bridge Detection and Reinforcement Technology Ministry of Transport Beijing 10088 China

Prestressed reinforcement is one of the most hidden and important project in bridge enginerring. It directly determines the structure of the bending, shear, anti vibration, anti impact performance, it also has influence on the safety and durability of the structure. To evaluate old bridge structure, it is required to detect the internal reinforced distribution (quantity, specifications, protection layer thickness). In addtition, due to poor construction quality, position of prestressed tendons biased, and grouting can not get guarantee, which leads to serious corrosion of prestressing tendons, consequently in potential safety hazard. All above indicate that by using nondestructive method, it is significant to locate the prestressed tendon and define the quantative and distribution in structure. Then, it is required to evaluate the grouting condition of prestressed ducts, and regrouting for the flaw ducts. This paper focuses on several current famous prestressed grouting nondestructive detection methods, combining the characteristics of the actual bridge structure, and the accuracy of each method is obtained. Results is compared with applicability and pertinency. Research results provide method and basis for detecting subsequent prestressed bridge.

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Simplification of Vertical Live Loading for In-Service bridge Pile Foundation

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IOP Conference Series: Materials Science and Engineering 2018年第6期392卷

作者： Juan Hu Jingjing Gao College of Urban Construction Zhejiang Shuren University Hangzhou 310015 China. Key Laboratory of Bridge Detection Reinforcement Technology Ministry of Communications Chang'an University College of Highway Xi'an 710064 China. Shaanxi Railway Institute Weinan 714000 China.

In order to determine the distribution of live load on the in-service bridge pile, the live load were statistically analyzed that the distribution at the end of the beam at the fulcrum of the beam and the T beam in the middle and small span of the highway bridge, the proportion of live load is obtained in the counter force at the end of the beam. According to the statistical results, the corresponding relationship between the ratio of cyclic loading and the span of highway bridge is established, and according to the traffic volume and the effective number of trips calculated by different types of vehicles, the relation between the number of cyclic loads and the operation time of the bridge pile foundation is analyzed. The above results were combined with the time cycle of the vehicle on the bridge, a simplified calculation model of static load and live load on bridge pile foundation is established, which the obtained results can be directly applied to the test and loading of in-service bridge pile foundation and to guide the single pile model test in the laboratory, and has a strong application value.

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Experimental study of the anti-slip capacity of saddle-type pylon-anchorage for extra-dossed bridges

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Journal of Computational and Theoretical Nanoscience 2016年第2期13卷 1486-1493页

作者： Niu, Yanwei Qu, Xiaoxiao Cao, Hongen Du, Longji Huang, Pingming School of Highway Chang'An University Xi'an Shaanxi710064 China Key Laboratory of Bridge Detection Reinforcement Technology Transportation Ministry Xi'an Shaanxi710064 China

Extra-dossed bridges, also known as low-pylon, cable-stayed bridges, have been developed and applied widely in recent years. In cable-stayed bridges, pylon-anchorage is critical for reliable connections between the cable and the pylon. For extra-dossed bridges, the pylon cross-section is small and the anchorage zone is limit. Saddle type pylon-anchorage, a new connection type, overcomes the shortcomings. In this study, based on an actual extra-dossed bridge, Nanpanjiang bridge, a fullscale segment model is cast to test the anti-slip capability of saddle type pylon-anchorage. First, the structural details and model dimensions are illustrated, and a practical formula is derived for the computation of parameter μ, the friction coefficient between the strand and the sub-wire tube. Then, parameter μ is tested based on the cable force passed from jack loading, which indicates the construction stage. Finally, epoxy mortar is poured into the anchor, which is consistent with the normal operation stage of the bridge, and the effect of epoxy mortar is examined to ensure that the anchorage has sufficient anti-slip capacity. The results of the experiment show that during construction, the friction coefficient is between 0.054 and 0.064, and according to the classification loading test, the friction coefficient increases as the cable force increases. After the external anchorage is sealed, the anti-slip capacity is sufficient for operation, and the simplified method of computation can be referenced for similar engineering. © 2016 American Scientific Publishers All rights reserved.

关键词： Friction

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Calculation Method for the Cable Zone Beams of a Single Cable Plane Low-Pylon Cable-Stayed bridge with a Wide Box Girder 5

Calculation Method for the Cable Zone Beams of a Single Cabl...

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5th International Conference on transportation Engineering, ICTE 2015

作者： Zhan, Binglai Sun, Ning Li, Yang Xu, Yue Key Laboratory of Bridge Detection and Reinforcement Technology Ministry of Communication Chang'an University Xi'an Shanxi China CCCC First Highway Consultants Co. Ltd. Xi'an China

ISBN: (数字)9780784479384

ISBN: (纸本)9780784479384

The researches for cable area beams of single cable plane low-pylon cable-stayed bridge were summarized;Based on plane frame theoretical mechanics, the simplified model for cable area beams of single cable plane low-pylon cable-stayed bridge with wide box girder is elaborated;and mechanical characteristics of the cable zone beams were studied by changing the structural properties. The Conclusions has some reference value. © ASCE.

关键词： Low-pylon cable-stayed bridge Single cable plane Cable zone beam Simplified calculation modalities The mechanical characteristic Mechanical properties cable computational methods Box beams Cable stayed bridge reference value plane Platanus hybrida BEAM Beams and girders Planing

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Seismic Isolation and Energy Absorption Properties Research for a Dry Joint Segment Fabricated Pier Viaduct in a Highly Seismic Region 5

Seismic Isolation and Energy Absorption Properties Research ...

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5th International Conference on transportation Engineering, ICTE 2015

作者： Zhan, Binglai Sun, Ning Li, Yang Key Laboratory of Bridge Detection and Reinforcement Technology Ministry of Communication Chang'an University Xi'an Shanxi China CCCC First Highway Consultants Co. Ltd. Xi'an China

ISBN: (数字)9780784479384

ISBN: (纸本)9780784479384

This article proposes a bilinear stiffness plastic hinge simplified model , based on the existing experimental research on dry joints fabricated pier;Using of nonlinear time history analysis method, seismic isolation performance of combination system of dry joints fabricated pier with laminated rubber bearing is discussed in the perspective of damping isolation. Results indicate that the dry joints fabricated pier system can reduce the seismic force and energy. The conclusion has some practical significance for the applications of dry joints fabricated pier bridge in high earthquake region. © ASCE.

关键词： Seismic isolation performance Fabricated pier Time history analysis method Simplified calculation mode

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