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2020 International Conference on Intelligent Transportation, Big Data and Smart City, ICITBS 2020

作者： Zong, Xuemei Liu, Pingjun Yang, Fang Liu, Gang Zhou, Mi China United Northwest Institute for Engineering Design Research Co. Ltd Xi'an710077 China State Key Lab. for Old Bridge Detection and Reinforcement Technology Ministry of Transportation Chang'An University Xi'an710064 China

ISBN: (纸本)9781728166971

In order to study the seismic isolation bearing problem of the single tower cable-stayed bridge under earthquake action, the seismic performance of the bridge is improved at the conceptual design stage. For the overload yield bearing, a single tower cable-stayed bridge in the high intensity area is taken as the research object. The full-bridge three-dimensional finite element model was established by SAP2000 spatial structure analysis and design program. The pile-soil interaction was considered, the vertical joint of the pylon was simulated, and the structural natural vibration characteristics, response spectrum and nonlinear seismic response time history analysis were carried out. meanwhile, the influence of the shear of bearing on the natural vibration period and seismic response of single-tower cable-stayed bridge is also studied in this paper. The results show that under the nonlinear time history analysis, the bearing will be sheared under the E1 probability. After the shear, the structural period is prolonged, the seismic response of the auxiliary pier and the side pier is greatly improved and the plastic hinge can be avoided. Under the E1 probability and the E2 probability, considering the shear of the bearing, the seismic response of each main component of the structure is smaller than the ultimate bending moment of the section, and the damping effect is good. The research results show that the overload yield bearing has a high promotion value and can provide reference for the seismic design of the same type of bridge. © 2020 IEEE.

关键词： Cable stayed bridges

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Analysis of Factors Affecting Ductility of Reinforced Concrete Column

Analysis of Factors Affecting Ductility of Reinforced Concre...

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International Conference on Smart City and Systems Engineering (ICSCSE)

作者： Mi Zhou Yongcun Jiang 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

In order to study the ductility of reinforced concrete columns under the influence of different parameters, six reinforced concrete column models with different design parameters were fabricated based on the pseudo-static test of large-scale reinforced concrete columns. The failure modes of reinforced concrete columns under the influence of different column height, longitudinal reinforcement ratio and chloride ion erosion were studied. The hysteresis curves and skeleton curves obtained from the test were analyzed, and the relationship between the displacement ductility of reinforced concrete columns and three influencing factors was obtained.

关键词： Concrete Hysteresis Skeleton Loading Ions Force Earthquakes

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Summary of Research on Seismic Behavior of Precast Column System With the Same Effect as the Cast-In-Place Column

Summary of Research on Seismic Behavior of Precast Column Sy...

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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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Image-based method for concrete bridge crack detection

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Journal of Information and Computational Science 2013年第8期10卷 2229-2236页

作者： Li, Gang He, Shuanhai Ju, Yongfeng School of Electronic and Control Engineering Chang'an University Xi'an 710064 China Key Lab. for Old Bridge Detection and Reinforcement Technology of Min. of Transportation Chang'an University Xi'an 710064 China

This paper presents a modified image processing method for detecting cracks in surface images of concrete bridges. Clip, filling and rotation transformation are applied on concrete images for precise extracting cracks. Modified C-V model, adaptive threshold, morphology, C-V model and Canny are compared on segmenting crack images which are gathered in different illumination. Analysis results indicated that the misclassification rate of the modified C-V model is 3.56% and the operation time is 96 ms. Therefore, the proposed method can be used for the accurate detection of cracks in surface images recorded under various conditions. Moreover, the estimated crack widths are in good agreement with those measured manually. Copyright © 2013 Binary Information Press.

关键词： Image segmentation

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Numerical analysis of floating protection system for bridge structure subjected to vessel impact

Numerical analysis of floating protection system for bridge ...

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2011 International Conference on Electric technology and Civil Engineering, ICETCE 2011

作者： Fan, Wei Yuan, Wancheng Gangjin Li Mi Zhou State Key Lab. of Disaster Reduction in Civil Engineering Tongji University Shanghai China Key Lab. for Old Bridge Detection and Reinforcement Technology of Ministry of Transportation Chang'An University Shaanxi China

ISBN: (纸本)9781457702907

A floating protection system is presented to protect bridge structures from vessel impacts. Based on general contact-impact nonlinear finite element technique, the high resolution models of the 5,000-DWT ship and the protection system are developed to evaluate the performance of the floating protection system under vessel collisions. The results show that the protection system can effectively absorb the moderate impact energy from the ship and avoid the damage of both the ship and structures. Finally, a general design procedure is discussed briefly for practical design. © 2011 IEEE.

关键词： Ships

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The analysis model of interaction of piles-soil-bridge for elevated pile foundation

The analysis model of interaction of piles-soil-bridge for e...

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International Conference on Electric technology and Civil Engineering

作者： Zhou, Mi Zhang, Yue Yuan, Wancheng Key Laboratory for Old Bridge Detection and Reinforcement Technology Ministry of Transportation Chang'An University Xi'an China School of Construction and Civil Engineering xi'An University of Science and Technology Xi'an China State Key Laboratory for Disaster Reduction in Civil Engineering Tongji University Shanghai China

ISBN: (纸本)9781457702907

the several kinds of pile-soil simplified analysis models were enumerated in the paper. Four analysis models were chose to build the elevated-pile- foundation FEM of a cable-stayed bridge. Then dynamic analysis and push-over analysis were done. The results of dynamic characteristics, pushover curves and form mechanism of the plastic hinges were compared by different simplified models. The truncated model was proposed in the paper because whether anti-push rigidity or plastic-hinge mechanism calculated by this model is most close to prototype. So the paper provided a simplified model for pile group foundation which could simplify calculation and guarantee the calculation precision. Research results can be used for conceptual design of bridges. © 2011 IEEE.

关键词： Piles

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