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Zeng Y.,North China University of Water Conservancy and Electric Power | Zhang G.,Henan Provincial Communications Planning Survey and Design Institute Co. | Wang Z.,Henan Provincial Communications Planning Survey and Design Institute Co.
Applied Mechanics and Materials | Year: 2011

in order to understand the mechanical characteristics of shenqiu Zhidian Bridge considering the influence of pavement, On the basis of installing steel mesh in rigid bridge or consecution to enhance the bonding performance between the pavement and girder, the load test is conducted. According to the test result and the calculations result the bearing capacity and work performance of bridge are evaluated. The results show that in the design of bridge, by enhancing the bonding performance between the pavement and girder, considering the overlaid pavement participating in force corresponds with the actual stress structure. © (2011) Trans Tech Publications.


Hu S.-N.,North China University of Water Conservancy and Electric Power | Wu Y.-J.,Henan University of Economics and Law | Yang-Yong,Henan provincial communications planning survey and design institute CO
International Journal of Earth Sciences and Engineering | Year: 2014

The accurate prediction of city traffic accident rate is premise and difficulty of traffic safety management, through using least square support vector machines (LS-SVM) theory, selects radial direction base kernel function, has built the accident rate prediction model. Selecting Zhengzhou city relevant statistical data of 2010-2012 years, city population quantity, vehicle inventory, passenger transport rate, transported goods volume as well as city GDP total quantity have been taken as forecast target, carries on the modeling to the city road ten thousand vehicle accident rates for training and validation, the experimental results show that: LS-SVM can misalignment nonlinear relations between accident rates and influencing factors well. The analog computation precision is high, generalization ability is strong, may forecast the road traffic accident rate effectively. © 2014 CAFET-INNOVA TECHNICAL SOCIETY. All rights reserved.


Zeng Y.,North China University of Water Conservancy and Electric Power | Wang Z.,Henan Provincial Communications Planning Survey and Design Institute Co.
Applied Mechanics and Materials | Year: 2011

in this paper dynamic behavior of the Ying Zhou main bridge in Luoyang is studied. The finite element analysis software ANSYS is adopted to set up three-dimensional finite element model of a CFT arch bridge of the main bridge. The natural periods and modes of the CFT arch bridge are calculated by using the subspace iteration method. Meanwhile its modal characteristics are analyzed. Some useful conclusions are got by the calculation and analysis of the bridge for the engineering construction. © (2011) Trans Tech Publications.


Chen L.,Hubei Engineering University | Liu Q.,Hubei Engineering University | Zhang G.,CAS Wuhan Institute of Rock and Soil Mechanics | Zhang X.,Henan Provincial Communications Planning Survey and Design Institute Co.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2014

Inrush accidents generally happen in soluble rock tunnels during underground constructions. However, the number of inrush disasters reported in non-soluble rock tunnels have been increasing recently. They can lead to serious disasters and huge economic losses in tunnel construction. Cases studies were thus carried out and the analysis of three inrush accidents revealed that the causes of the inrush in non-soluble rock tunnels were due to the effects of excavation and blasting disturbance leading to the water and fragmental materials occurred in the fractured and weak zones flowing into the tunnels under their own pressures. The risks carrying environment must have the required physical, spatial and triggering conditions simultaneously: the physical conditions refers to the existence of abundant water and in-situ or exogenous fragments including gravel, sand and mud, etc.; the spatial condition refers to the fracture zone and the weak zone storing and transferring the inrushing materials; The triggering condition is the disturbance to the rock caused by excavation and blasting during the tunnel construction. The predication of inrush disaster in the construction of non-soluble rock tunnels is therefore to identify the fracture and weak zones containing the potential inrushing materials and the components and cementation level of material in two zones a head of the front face of tunneling. A comprehensive geological and geophysical detection and drilling scheme was then carried out to according to the material and spatial conditions in inrush disaster; The characteristics of seismic dynamic response of the parameters such as the reflection amplitude ratio and the wave axis similarity to anomaly geological objects in tunnel geologic prediction(TGP) were constructed. The approach was applied to the fault fracture zone F17 in anterior tunnels. The macro engineering geological analysis, geological investigation and experiments in excavated sections and the trends tracking were performed to reveal the statistical and mechanical characteristics of the surrounding rocks. The long range TGP and the short range ground penetration radar detections and the horizontal drilling were performed to identify the risks containing environment of inrushing disaster in the section unexcavated. The precise locating of the position, the scale and the spatial distribution of the fault fracture zone were thus be achieved. The material components within the zones and the cementation level were detected and the occurrences of inrush accidents were predicted successfully.


Zhiqiang C.,Chinese Research Institute of Highway | Jing Z.,Henan Provincial Communications Planning Survey and Design Institute Co. | Rui L.,Kunming University of Science and Technology | Hexun H.,Kunming University of Science and Technology
Proceedings - 2015 7th International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2015 | Year: 2015

In order to improve the anti-seismic performance of skew bridge at high intensity seismic action, the paper establish the calculation and analysis model of skew bridge response based on finite element. The engineering example results show that the global stability of the structure decreases with the increase of skew angle in skew girder bridge, and the torque of bridge pier is increasing with the increase of skew angle. © 2015 IEEE.


Dan D.,Tongji University | Chen Y.,Henan Provincial Communications Planning Survey and Design Institute Co. | Xu B.,Tongji University
Shock and Vibration | Year: 2015

The precise measurement of the cable force is very important for monitoring and evaluating the operation status of cable structures such as cable-stayed bridges. The cable system should be installed with lateral dampers to reduce the vibration, which affects the precise measurement of the cable force and other cable parameters. This paper suggests a cable model updating calculation scheme driven by the particle swarm optimization (PSO) algorithm. By establishing a finite element model considering the static geometric nonlinearity and stress-stiffening effect firstly, an automatically finite element method model updating powered by PSO algorithm is proposed, with the aims to identify the cable force and relevant parameters of cable-damper system precisely. Both numerical case studies and full-scale cable tests indicated that, after two rounds of updating process, the algorithm can accurately identify the cable force, moment of inertia, and damping coefficient of the cable-damper system. © 2015 Danhui Dan et al.


Dan D.-H.,Tongji University | Chen Y.-Y.,Henan Provincial Communications Planning Survey and Design Institute Co. | Xiao R.,Tongji University
Zhendong Gongcheng Xuebao/Journal of Vibration Engineering | Year: 2014

As to the transcendental frequency equations of stay cable-damper system in consideration of double clamped end boundary conditions and flexural rigidity, a numerical equation solution based on Steffensen stable point iterative methods are present in this paper. According to the distinct characteristics in phase of design and implementation of the real cable-damper system, the influence of damping coefficient induced by external dampers and the cable tension on first 10 orders of modal frequencies and damping ratios are investigated by resolving the equations with aforementioned method. It is showed that, these two factors affect the modal damping ratios of stay cable-damper system more marked than modal frequencies, and both of them can service as the design variables in phase of design and implementation of real stay cable-damper system. Further discussion and proposal on the roadmap of systemic level optimal design of stay cable-damper is conduced based on results obtain this paper.


Dan D.,Tongji University | Chen Y.,Henan Provincial Communications Planning Survey and Design Institute Co. | Xiao R.,Tongji University
Earthquake Engineering and Engineering Vibration | Year: 2014

A numerical solution based on the Steffensen stable point iterative method is proposed to resolve the transcendental frequency equation of a stay cable-damper system. The frequency equation, which considers clamped supports and flexural rigidity of the cable, is intended to investigate the influence of the parameters of the cable damper system on its dynamic characteristics. Two factors involved in the design and construction phases, the damping coefficient induced by external dampers and the cable tension, are the focus of this study. Their impact on modal frequencies and damping ratios in these two phases of cable-damper systems are investigated by resolving the equation with the proposed solution. It is shown that the damping coefficient and cable tension exert more noticeable effects on the modal damping ratios than on the modal frequencies of stay cable-damper systems, and the two factors can serve as design variables in the design phase and as adjustment factors in the construction phase. On the basis of the results, a roadmap for system-level optimal design of stay cable-damper systems that can achieve global optimal vibration suppression for the entire bridge is proposed and discussed. © 2014 Institute of Engineering Mechanics, China Earthquake Administration and Springer-Verlag Berlin Heidelberg.


Zeng Y.,North China University of Water Conservancy and Electric Power | Zeng Y.,Henan Provincial Communications Planning Survey and Design Institute Co.
Applied Mechanics and Materials | Year: 2013

By the detection of a three spans continuous beam bridge, the detection loading method and arrangement of measuring points are discussed, the static and dynamic detection results such as the deflection, stress and inherent vibration frequency are comparative analyzed with those of theoretical calculation. Results show that the bridge is safe under actual working condition, which provides the basis for normal operation and maintenance of the bridge. © (2013) Trans Tech Publications, Switzerland.


Li F.,Henan Provincial Communications Planning Survey and Design Institute CO.
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2012

According to the characteristics of self-anchored cable-supported bridges, a new-style steel-concrete joint was proposed. Based on one sea-crossing bridge, a space finite element model that contains solid elements and shell elements was built by ANSYS. Meanwhile, the bond-slip behavior of steel and concrete is also taken into account. By the stress level analysis of several different contact surfaces, the force transfer principle and stress distribution characteristics of the steel-concrete joint of self-anchored cable-supported bridges were studied, which will help to design the steel-concrete joint of self-anchored cable-supported bridges.

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