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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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External Prestressing bridge reinforcement technology Review

External Prestressing Bridge Reinforcement Technology Review

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The 2015 2nd International Conference on Engineering technology and Application

作者： Hanbing Zhu Yaxun Yang Weiya Fan Key Laboratory for Old Bridge Detection and Reinforcement Technology of Ministry of Transportation Chang'an University Chang'an University

Externally prestressed bridge can not only limit and reduce the cracks and deformation of the structure,improve the rigidity and bearing capacity of structure,improve the stress state of structure,but also have less interference for bridge operation when it is operating and have the good economic *** paper introduces the advantages and disadvantages of external prestressed strengthening technique,its calculation theory and construction technology described in detail,and finally the paper discusses the deficiency of existing research.

关键词： Externally prestressed old bridge reinforcement theory of computation construction process

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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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Force-based and displacement-based reliability assessment approaches for highway bridges under multiple hazard actions

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Journal of Traffic and Transportation Engineering(English Edition) 2015年第4期2卷 223-232页

作者： Chao Huang Jerry J.Shen Mi Zhou George C.Lee Department of Civil Structural and Environmental Engineering University at Buffalo Genex Systems/TFHRC 6300 Georgetown Pike Mc Lean 22101 USA National Engineering and Research Center for Highways in Mountain Area Key Laboratory for Old Bridge Detection and Reinforcement Technology of Ministry of Transportation Chang'an University

The strength limit state of American Association of State Highway and Transportation Officials （AASHTO） Load and Resistance Factor Design （LRFD） bridge Design Spec/fications is developed based on the failure probabilities of the combination of non-extreme loads. The proposed design limit state equation （DLSE） has been fully calibrated for dead load and live load by using the reliability-based approach. On the other hand, most of DLSEs in other limit states, including the extreme events i and li, have not been developed and calibrated though taking certain probability-based concepts into account. This paper presents an assessment procedure of highway bridge reliabilities under the limit state of extreme event i, i. e,, the combination of dead load, live load and earthquake load. A force-based approach and a displacement-based approach are proposed and implemented on a set of nine simplL^ed bridge models. Results show that the displacement-based approach comes up with more convergent and accurate reliabilities for selected models, which can be applied to other hazards.

关键词： bridgeReliability assessmentMultiple hazardsLoadResistance

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The linear monitoring analysis of PC continuous beam bridge

The linear monitoring analysis of PC continuous beam bridge

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International Conference on Machine Tool technology and Mechatronics Engineering, ICMTTME 2014

作者： Yang, Ya Xun Gong, Gao Key Laboratory for Old Bridge Detection and Reinforcement Technology of Ministry of Transportation Chang’an University Shaanxi Xi’an China

ISBN: (纸本)9783038352464

According to the structure and construction characteristics of prestressed concrete (PC) continuous beam bridge and combined with the construction monitoring method of continuous beam bridge, this paper introduces the girder deflection test technology and method of prestressed concrete continuous box girder bridge, also analyzes the various factors which affect the linear monitoring. And draw the conclusion through the analysis of the deflection and linear monitoring of LinGang big bridge. © (2014) Trans Tech Publications, Switzerland.

关键词： Prestressed concrete

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The stress monitoring analysis of PC continuous beam bridge

The stress monitoring analysis of PC continuous beam bridge

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International Conference on Machine Tool technology and Mechatronics Engineering, ICMTTME 2014

作者： Yang, Ya Xun Fan, Wei Ya Key Laboratory for Old Bridge Detection and Reinforcement Technology of Ministry of Transportation Chang’an University Xi’anShaanxi China

ISBN: (纸本)9783038352464

According to the structure and construction characteristics of PC continuous beam bridge and combined with the construction monitoring method of continuous beam bridge, this paper introduces the girder stress strain test technology and method of prestressed concrete continuous box girder bridge, also analyzes the various factors which affect the stress test. After monitoring LinGang big bridge, draw the conclusion through the analysis of its stress and strain. © (2014) Trans Tech Publications, Switzerland.

关键词： Box girder bridges

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Dynamic analysis and test validation for continuous girder bridge

Dynamic analysis and test validation for continuous girder b...

引用

4th International Conference on Civil Engineering, Architecture and Building Materials, CEABM 2014

作者： Yang, Ya Xun Liu, Peng Key Laboratory for Old Bridge Detection and Reinforcement Technology of Ministry of Transportation Chang'an University Xi'an 710064 Shaanxi China

ISBN: (纸本)9783038351672

With the rapid development of technology of bridge, bridge as an important part of the traffic network, the safety of its operations was getting more and more attention by people. In order to ensure the bridge can be safe and reliable operating, the newly built bridge testing had become a necessary measures. In this paper, a three span continuous box girder bridge (28+36+28m) was taken as an example, To analyze and calculate its dynamic characteristics, the finite element software MISAS was used. And it was verified through experiments. © (2014) Trans Tech Publications, Switzerland.

关键词： Finite element method

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