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Wang Y.,China Railway Major Bridge Reconnaissance and Design Institute Co. | Zhong N.,Chongqing Expressway Group Co. | Zhuang W.,Survey and Design Institute | Zheng X.,Survey and Design Institute
Proceedings of the Institution of Civil Engineers: Bridge Engineering | Year: 2014

The Guanyinyan Yangtze River Bridge is the key structure on the second ring highway of Chongqing City, southwest of China. The bridge is a cable-stayed bridge with a main span of 436 m. The main girder is a steel-concrete composite girder with a total width of 36?2 m. The final design solutionwas based on an extensive comparison of proposals. Themain bridge was constructed using the balanced cantilever method. This paper presents the challenges in design and static analysis of the bridge, including the detailed design, global static analysis, local finite element model analysis, the determination of the allowable maximum thickness of steel plate against fatigue and brittle fracture induced by low temperature.

Wang Y.,China Railway Major Bridge Reconnaissance and Design Institute Co. | Zhuang W.,Design and Research Institute | Zhong N.,Chongqing Expressway Group Co.
Structural Engineering International: Journal of the International Association for Bridge and Structural Engineering (IABSE) | Year: 2013

The Jiangjin Guanyinyan Yangtze River Bridge is a key structure on the second ring road of Chongqing city, China. The mai n bridge is a steel-concrete composite ladder-girder cablestayed bridge with a main span of 436 m. The article presents the main design features and analysis of the bridge, including the pylon and foundation, steel-concrete composite laddergirder, cable anchorage device, precast slab, cast-in-site closing concrete and stayed cables.

Zhao M.,Chongqing University | Sun D.-H.,Chongqing University | Tang Y.,Chongqing University | Tang Y.,Chongqing Expressway Group Co. | He H.-P.,Chongqing University
Proceedings of the World Congress on Intelligent Control and Automation (WCICA) | Year: 2012

A novel method for head detection was proposed in video sequences captured with fixed vertical mono-camera, which integrated hough transformation, hair-color distribution model and circle existence model. Target area was firstly detected using fast gradient hough transformation (FGHT). In order to overcome head area mis-detection and incapability of locating head area introduced by FGHT, hair-color classification was used to filter the candidate targets through modeling hair-color distribution. Furthermore, based on non-parameter probability theory, the probability of circle existence model was established, which finalized the stages of head detection by locating the head. Compared with average circle detection algorithm, experimental results indicate that the proposed head detection algorithm can eliminate false targets and greatly increase accuracy. © 2012 IEEE.

Zhang Y.-X.,Chongqing University | Ding M.,Chongqing University | Wang H.,Chongqing Expressway Group Co.
Yantu Lixue/Rock and Soil Mechanics | Year: 2012

For multi-braced diaphragm wall structure calculation, a matrix displacement method based on the theory of elastic foundation beam is derived considering the effects of staged excavation upon internal force and displacement as well as the bracing force. Based on the Melan's solution, combining with the geometrical plane-strain problems, a displacement solution in semi-infinite elastic under horizontal strip load is derived. Furthermore, the horizontal foundation coefficient applied to the above matrix displacement method is gained. Compared with measured results of diaphragm wall obtained from engineering cases, the analysis results indicate that the matrix displacement method is convenient and feasible, and it can provide references to the similar projects.

Liu S.M.,Chongqing Jiaotong University | Liu S.M.,Chongqing University | Liu Q.Y.,Chongqing Expressway Group Co.
Applied Mechanics and Materials | Year: 2012

A lot of bridge reinforcement and rehabilitation projects are been implementing throughout China and many countries in the world. However, some fundamental questions still remain unsettled, and this paper addressed one of them, which is the bearing capacity of strengthened beams. We analyzed the loading process of beams after strengthening with strain lag effect, and focused on several critical states. To validate our conclusions, we developed a non-linear FEM program, and compared the data yielded by program with those from reference. We found that for adequate reinforcement RC beams the influence of strain lag effect on the bearing capacity depends on the property of reinforcing material. The conclusion matched with experiment very well. © (2012) Trans Tech Publications.

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