Chongqing Expressway Group Co.

Chongqing, China

Chongqing Expressway Group Co.

Chongqing, China
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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.


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.


Hu X.,Chongqing Jiaotong University | Zhong N.,Chongqing Expressway Group Co. | Jing S.,Chongqing Expressway Group Co.
Advanced Materials Research | Year: 2013

Based on the shrinkage and creep theory model of the JTG D62-2004 and trough the finite element analysis software, it is to respectively calculate the main span displacement and the upper and lower edge stress of the steel beam and the concrete slab under the impacts of concrete shrinkage and creep at the initial stage and the normal operation stage (with 10 years of shrinkage and creep calculated) for the steel-concrete composite deck system of the cable-stayed with a main beam of 436m.The results show that the effects of the shrinkage and creep can't be ignored. © (2013) Trans Tech Publications, Switzerland.


Hu X.H.,Chongqing Jiaotong University | Zhong N.,Chongqing Expressway Group Co. | Jing S.H.,Chongqing Expressway Group Co.
Advanced Materials Research | Year: 2014

Study and design a set of economical and practical mid-and-long term monitoring system for long-span prestressed concrete continuous rigid frame bridge relying on the engineering of Xintan Qijiang Bridge in Chongqing. Master the static characteristics of such parameters as displacement, stress and external cable force during operation process of bridge through finite element model and make a comparative analysis of the relevant data after running for two years to test the feasibility and practicability of mid-and-long term monitoring system for continuous rigid frame bridge suggested in the paper. © (2014) Trans Tech Publications, Switzerland.


Yang J.,Chongqing Jiaotong University | Sun J.,Chongqing Jiaotong University | Liu Q.,Chongqing Expressway Group Ltd
WIT Transactions on Engineering Sciences | Year: 2014

This paper presents a method about the predictability analysis of bridge state by using the Hurst exponent extracted via R/S analysis. We utilize R/S analytic approach to estimate Hurst exponent of three sets of monitoring data of Masangxi Bridge, deflection, strain and acceleration, and their Hurst exponent is 0.34311, 0.36621, 0.25924, respectively, less than 0.5. So, the futuristic changing trend of bridge deflection, strain, and acceleration is negatively correlated with the corresponding historical data fluctuation. And use V-statistics analysis to calculate the change circle of above data, the result is 28d, 28d and 20d, respectively. Based on the varied periodic quantity, falling three sets of original data into different sections, then extract the max value of each section, From the changing trend of the annual data, the yearly change of three sets of original data indeed present a certain periodic reverse persistence. The result shows that, as a complex dynamical system, the evolution of bridge structural state presents a certain reverse persistence, by using the R/S analysis to forecast the evolution process of bridge state is feasibly. © 2014 WIT Press.


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 T.,Chongqing Jiaotong University | Tang B.,Chongqing Jiaotong University | Li H.,Chongqing Expressway Group Co.
Advanced Materials Research | Year: 2012

Hydroplaning ranks a maior inducement of wet-weather road accidents. By way of CFD (Computational Fluid Dynamics) approach, this paper frames a finite-element meta-models for rib tires ranging in groove depth, aiming to figure out the wheel water pressures on tires under different traveling conditions, and to find out water velocities of the different parts of the tire tread. Analysis shows that the action coverage of the high pressure induced by hydradynamic pressure is correlated with the thickness of standing water, and the grooves fail to drain as designed in case of total hydraplaning. Based on the outcomes of the experiments, this paper frames the relation formula between hydradynamic pressure and traveling velocity, standing water depth and tire tread groove depth, and thus gives recommendations on speed range in wet weather driving, and also on measures for safe driving in wet weather conditions. © (2012) Trans Tech Publications, Switzerland.


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.


Liu S.M.,Chongqing Jiaotong University | Liu S.M.,Chongqing University | Sun M.,Chongqing Jiaotong University | Liu Q.Y.,Chongqing Expressway Group Co.
Advanced Materials Research | Year: 2012

Bridges are the key components of civil infrastructure. Since decades ago, bridge strengthening and rehabilitation have become popular and their wider applications would be needed in the future. Although much research was carried in this field, some important problems including bearing capacity of reinforced beams didn't form concordant views in this community. To research influence on bearing capacity of reinforced RC beams, we analyzed the loading process of RC reinforced beams from the beam-loaded-only stage to that of co-working of compound beams (including original beams and their strengthening layers), developed non-linear FEM program to simulate that loading progress, and finally validated the results with data from reference. This paper presents the theoretical analysis, and compares data yielded by program with those of experiment. We found that for adequate reinforcement beam the influence of secondary loading on the ultimate bearing capacity of reinforced beams is very limited. Our finding was confirmed by the experiment and FEM program.


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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