State Key Laboratory Breeding Base of Mountain Bridge and Tunnel Engineering

Chongqing, China

State Key Laboratory Breeding Base of Mountain Bridge and Tunnel Engineering

Chongqing, China

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He S.,Chongqing Jiaotong University | Liang B.,Chongqing Jiaotong University | Liang B.,State Key Laboratory Breeding Base of Mountain Bridge and Tunnel Engineering | Luo H.,Chongqing Jiaotong University
Modern Tunnelling Technology | Year: 2017

The horizon in front of a driver has a direct relationship with how the driver prejudges and treats dangerous conditions. Highway tunnel sidewalls are an important part of the visual field of a driver and have an impact on driving safety. A spectroradiometer luminance meter was used to test the lighting parameters of different sidewall coatings, and lighting environments with the same lighting parameters and different sidewall coatings were simulated. Using this highway tunnel lighting simulation and an effect evaluation device, the effects of three coatings on a driver's visual perception performance were evaluated based on reaction time, and a new method of highway tunnel lighting was explored regarding driving safety and energy savings. The result shows that the lighting environment can be significantly improved by using energy-storage and self-luminous materials for the tunnel sidewall; under the same LED lighting conditions, the driver's visual performance is improved by using the coatingg material with high reflectance and yellow and green components in the reflective spectrum and it is thus favorable in terms of driving safety and energy savings for highway tunnels. © 2017, Editorial Office of "Modern Tunnelling Technology". All right reserved.


Yao G.W.,Chongqing Jiaotong University | Yao G.W.,State Key Laboratory Breeding Base of Mountain Bridge and Tunnel Engineering | Zhong L.,Chongqing Jiaotong University | Jiang D.X.,China Coal Technology and Engineering Co.
Applied Mechanics and Materials | Year: 2014

A loading device was developed in this paper basing on corrosion experiments of conventional metal and cable through collecting previous research about cable stress corrosion. This newly developed device makes loading possible under low frequency alternating stress and environmental corrosion coupling. Through the different condition for the steel strands corrosion experiments show that the speed of steel strand corrosion in alternating stress load is faster than non-stress and static-stress in the same conditions. The co-influence of corrosion and stress to the ductility of strand, the influence of alternating load peak and frequency to corrosion velocity were respectively analyzed. Three groups of verification experiment results show that the plastic deformation effects caused by the tension are much larger than the corrosion. Corrosion velocity of the specimens that reached threshold value under tensile stress is 1.47 times faster than the other three peak load specimens. And the ductility is not sensitive to low frequency, the ductility of the specimen is associated with tension and corrosion. © (2014) Trans Tech Publications, Switzerland.


Wang S.-R.,Chongqing Jiaotong University | Zhou Z.-X.,Chongqing Jiaotong University | Zhou Z.-X.,State Key Laboratory Breeding Base of Mountain Bridge and Tunnel Engineering | Gao Y.-M.,Chongqing Jiaotong University | Tang H.,Chongqing Jiaotong University
Jisuan Lixue Xuebao/Chinese Journal of Computational Mechanics | Year: 2015

This paper systematically described the segmental catenary theory and the basic equations of suspension bridge. The deformation stiffness iterative method calculating the main cable alignment was analyzed, which has been found that convergence problem may occur; therefore, an E-M method was put forward to calculate the precise main cable alignment of suspension bridge, namely on the basis of the equilibrium equation of main cable to derive the analytical relationship between the elevation of end point, middle point and the horizontal component H and vertical component V of the left end force of main cable, and the modified formulae of H and V considering the elevation error of end point and middle point. An example was introduced, results show that when the cable force is extremely uneven, E-M calculation method still can effectively make the alignment through three fixed points with and fast convergence speed and high precision. © 2015, Editorial Office of Chinese Journal of Computational Mechanics. All right reserved.


Wang S.,Chongqing Jiaotong University | Zhou Z.,Chongqing Jiaotong University | Zhou Z.,State Key Laboratory Breeding Base of Mountain Bridge and Tunnel Engineering | Gao Y.,Chongqing Jiaotong University | Huang Y.,Chongqing Jiaotong University
Mathematical Problems in Engineering | Year: 2015

The stiffening girder of self-anchored suspension bridge (SSB) is subjected to huge axial force because the main cable is directly anchored on the end of the stiffening girder. To obtain a simple model and accurately understand the mechanical behavior of the whole structure in preliminary design, this paper proposed an analytical calculation method considering the combined effects of the main cable-suspender-stiffening girder. On the basis of the deflection theory of the stiffening girder, the relation between the girder shape and the suspender force was explored. The relation between the main cable end force (MCEF) and the suspender force was derived through segmental catenary theory, and iteration method was further improved to avoid the divergence condition. Finally the solution was obtained through satisfying the compatibility condition. The proposed method does not need to iterate manually and can save calculation time. Examples are introduced to verify the applicability of this method, with the result that this method considers the combined effects of the main cable-suspender-stiffening girder, and the finished bridge state satisfies the minimum strain energy of the stiffening girder. Results also indicate that this method has fast convergence speed and high precision. © 2015 Shaorui Wang et al.


Zhou S.,State Key Laboratory Breeding Base of Mountain Bridge and Tunnel Engineering | Zhou S.,Chongqing Jiaotong University | Zhang M.,Chongqing Jiaotong University | Tian W.,Chongqing Jiaotong University | Xu J.,Chongqing Jiaotong University
Advanced Materials Research | Year: 2011

Taking deformation of the main arch under dead load as the arch alignment control target, the overall cable force and pre-camber of multi-rib arch were calculated by zero-order optimization method. According to the installation sequences of arch segments, taking deviation of cable tower, cables in one-time tensioning method and the section stress of arch chords as constraint conditions, the cable force and pre-camber for every segment were calculated by iterative method. This method is applied to the erection of a 400m steel truss arch bridge with three ribs, the calculated values of cable force are anastomosed with the measured ones, and the precision of arch alignment is high. © (2011) Trans Tech Publications, Switzerland.


Wu Z.,State Key Laboratory Breeding Base of Mountain Bridge and Tunnel Engineering | Wu Z.,Chongqing Jiaotong University | Jing S.,Key Laboratory of Bridge structure Engineering Ministry of Communications | Jing S.,Chongqing Jiaotong University | Liu J.,China CTDI Engineering Corporation
Advanced Materials Research | Year: 2012

In this paper, in combination with the specific conditions of light rail traffic volume, fatigue load spectrum parameters of light rail support are to be determined by background project light rail line 3 of Chongqing Caiyuanba Yangtze Bridge, through which the internal force history is then calculated. Three million constant amplitude fatigue loads that the test needs are finally determined through linear fatigue damage cumulative theory. © (2012) Trans Tech Publications, Switzerland.


Wu Z.,State Key Laboratory Breeding Base of Mountain Bridge and Tunnel Engineering | Ding D.,State Key Laboratory Breeding Base of Mountain Bridge and Tunnel Engineering | Jing S.,State Key Laboratory Breeding Base of Mountain Bridge and Tunnel Engineering
Applied Mechanics and Materials | Year: 2011

Based on the general description of the coupling deformation of composite sandwich thin-walled bar and the structural characteristics of rectangular sandwich bar, this paper studies the decoupling methods and approaches for composite sandwich thin-walled bar control equations and puts forward the decoupled control equations and boundary conditions. © (2011) Trans Tech Publications, Switzerland.


Wang Z.,China Communications Construction Company Ltd. | Wu H.,Chongqing Jiaotong University | Wu H.,State Key Laboratory Breeding Base of Mountain Bridge and Tunnel Engineering | Zhou Z.,Chongqing Jiaotong University | And 2 more authors.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2015

The main cable displacement characteristics of a large-span self-anchored suspension bridge are studied by both theoretical calculation and the total bridge model tests. The displacement coherence of main cables before and after support dismantling, the geometric nonlinear displacement characteristics of main cable in construction and finished stage are analyzed. The influence of structural system transformation on displacement of main cable is presented. The analysis results show that the weak coherence of the main cable is effective only when the girder support is not completely dismantled. The geometric nonlinear behavior of the main cable in construction stage can be divided into 4 phases (i. e., linear distinct features, enhancing nonlinear features, weakening nonlinear features and obvious linearization trend). The null point of influence line, which gets close to the tension point as construction process continues, shows more obvious geometric nonlinear features than the rest parts of the main cable. The geometric nonlinear features of main cable are influenced by the structure system transformation and the intensity of the nonlinearity is affected by sag-span ratio. In the finished stage, the displacement of main cable under the dead load shows an obvious linearization trend. ©, 2015, Tumu Gongcheng Xuebao/China Civil Engineering Journal. All right reserved.


Wang S.,Chongqing Jiaotong University | Zhou Z.,Chongqing Jiaotong University | Zhou Z.,State Key Laboratory Breeding Base of Mountain Bridge and Tunnel Engineering | Gao Y.,Chongqing Jiaotong University | Tang H.,Chongqing Jiaotong University
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2015

In most calculation methods for the reasonable finished bridge state of self-anchored suspension bridge, the combined action of cable-stiffening girder can not be considered in a single model, so repeated manual iteration or model boundary condition modification are usually adopted. For this reason, an analytical calculation method considering the combined action of cable-stiffening girder is proposed. Based on the stiffening girder deflection theory, the differential equilibrium equations, geometric equations, and the physical equations of the stiffening girder are used to derive the analytic relationship between the stiffening girder alignment and the suspender force. The end reaction force of the main cable is calculated from the suspender force using the segmental catenary theory. The solutions that meet the compatibility condition of the suspender force and the end reaction of the main cable is obtained by the iteration method. The calculation results by the proposed method agree well with the theoretical reasonable finished bridge state satisfying the principle of minimum potential energy of stiffening girder. The proposed method has the advantage of fast convergence speed and high precision that needed in practical engineering. ©, 2015, Tumu Gongcheng Xuebao/China Civil Engineering Journal. All right reserved.

Loading State Key Laboratory Breeding Base of Mountain Bridge and Tunnel Engineering collaborators
Loading State Key Laboratory Breeding Base of Mountain Bridge and Tunnel Engineering collaborators