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04 November 2015, Volume 34 Issue 5 Previous Issue    Next Issue
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Bridge & Tunnel Engineering
Highway & Railway Engineering
Port & Waterway ? Hydraulic & Hydroelectric ? Resources & Environment
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Bridge & Tunnel Engineering

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Analysis of Energy Transfer on Bridges Based on Seismic Elements Tang Lin, Xiao Shengxie, Wei Liangwen 2015, 34(5): 1-4.  DOI: 10.3969/j.issn.1674-0696.2015.05.01 Abstract ( )   PDF (460KB) ( )   The seismic wave transfer path in the subterranean and energy dissipation in the process of transfer as well as the energy loss passing between different media were analyzed.The effect of the energy of earthquake elements,including the seismic intensity,focal depth and the distance of the epicentre,on the bredge was discussed.The relational expression between response energy and the force of seismic inertia was obtained.And the effect and changing trends of different seismic elements on the energy were analyzed,which provided the analysis approach that the seismic energy transferring through the medium could exert seismic effect on the bridge. References | Related Articles | Metrics

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Design of the Composite Gussasphalt Steel Deck Pavement of the Large-Span Steel Box Girder Zhang Dengjing 2015, 34(5): 5-13.  DOI: 10.3969/j.issn.1674-0696.2015.05.02 Abstract ( )   PDF (1137KB) ( )   The causes of long-span steel box girder steel deck pavement diseases were analyzed; the various types of evaluation methods on diseases and the technical indicators were discussed, and the thought and the method that a steel deck pavement design should effectively avoid pavement diseases were proposed. According to the survey of atmospheric temperature, the field test of pavement temperature and the research of axle load spectrum, the temperature and axle load parameters for steel deck pavement design were proposed. Based on the asphalt mixture dynamic modulus testing, finite element analysis to calculate the pavement structure, bituminous mixtures test, composite beam fatigue test, the changes of the steel deck pavement performance under varying conditions of temperature and axle load parameters were analyzed, which was a direct guidance to the new method for the deck pavement design. Finally, based on the rutting test, diametral compression test and composite beam fatigue test, fatigue life prediction models were proposed and used to evaluate the anti-pavement rutting, anti-cracking, anti-shearing and anti-peeling properties. References | Related Articles | Metrics

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Limit Strength of Masonry Arch Bridge Considering the Constitution of Masonry Zheng Dan, Huang Caizheng 2015, 34(5): 14-17.  DOI: 10.3969/j.issn.1674-0696.2015.05.03 Abstract ( )   PDF (574KB) ( )   The relationship of moment and axial load of eccentrically loaded masonry section were analyzed, considering constitution of masonry material under compression till failure. The limit strength of masonry arch was achieved by nonlinear optimization mechanism analysis. The influence of masonry strength on limit strength of masonry arch was also discussed. The results show that when the compressive strength of masonry materials is low, bridge bearing capacity on the material strength is relatively sensitive, and with the bridge span increasing, the sensitivity is further increased. References | Related Articles | Metrics

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Bridge Finite Element Model Updating Based on Combination Function Response Surfaces Zhang Songhan, Gao Fangqing, Zhang Weiwei 2015, 34(5): 18-24.  DOI: 10.3969/j.issn.1674-0696.2015.05.04 Abstract ( )   PDF (1275KB) ( )   The bridge finite element model updating method based on the bridge response surface was studied. The combining function was established by quadratic polynomial and gauss RBF function. The sample data was obtained through ANSYS duplicate test. The regression response surfaces were fitted by least square method. According to the above study, the objective function was constructed and optimized by MATLAB. The proposed method had features, such as high fitting accuracy, strong anti-noise ability and controllable computational complexity. Through the model experiment of cantilever beam, model updating and dynamic response analysis of Bailey bridge, the measured results were reconstructed accurately by the updated models. It was showed that the real state of the actual structure could be reflected, which proved the validity of the proposed method. References | Related Articles | Metrics

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Design of Cable Tension Measurement System Based on Vibration Frequency Method Jiang Jianshan, Tang Guangwu, Liang Huapeng, Xiang Zhongfu 2015, 34(5): 25-28.  DOI: 10.3969/j.issn.1674-0696.2015.05.05 Abstract ( )   PDF (706KB) ( )   According to the principle that cable tension can be measured by vibration frequency method, the simplified cable tension measurement system based on SCM was designed, and both whole hardware and whole software design systems were finished. The whole software included the processing program about MCU, IIC bus program flow, frequency spectrum analysis, key control, as well as LCD module and host computer software. Finally, the cable tension measurement experiment with Dafosi Bridge of Yangtze River was carried out, and the experimental results showed that this measurement system was applicable, portable and easy to use. References | Related Articles | Metrics

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Particle Flow Code Numerical Analysis on Earth Pressure of Shield Tunnels Cave Xing Xinkui, Yan Maolong, Zhang Kunpeng, Li Ying, Zhang Jian 2015, 34(5): 29-32.  DOI: 10.3969/j.issn.1674-0696.2015.05.06 Abstract ( )   PDF (1364KB) ( )   Lots of numerical simulations were carried out on the change rule of earth pressure around the shield tunnel. The research work was about the distribution of the earth pressure around the tunnel considering the factors of shield tail void, diameter and buried depth. The soil’s stress path just above the tunnel was analyzed, in addition, exploring the change rule of soil’s vertical displacement under the condition of different buried depth around the tunnel. The results show that when the shield tail void is less than 20cm, the affected area of vertical earth pressure from excavation is within the range of soil of 2.7 times the tunnel diameter, and the soil arching mainly takes place within the range of soil of 2 times the tunnel diameter above the tunnel. According to the soil's stress path at different locations of the upper part of the tunnel, the region is divided into three sections, which are relative loose area around the tunnel, the stable pressure arch area and the area of inconspicuous soil arching effect. With the decrease of the embedded depth of the tunnel, the subsidence of the earth’s surface just above the tunnel is increased gradually, but the influence scope of the surface’s subsidence is decreased gradually. References | Related Articles | Metrics

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Analysis and Scheme Optimization of Pit Excavation Adjacent to Metro Tunnels in Soft Ground Ma Yongfeng, Zhou Dingheng, Cao Liqiao, Yi Li, Ran Wanyun 2015, 34(5): 33-39.  DOI: 10.3969/j.issn.1674-0696.2015.05.07 Abstract ( )   PDF (1530KB) ( )   Based on the engineering practice of one pit construction in soft ground, the application of finite element method to simulate pit construction process was presented with the consideration of the seepage of groundwater. The deformation of foundation pit and the excavation affection on metro tunnels were analyzed in detail. In addition, the deformation results of different construction schemes were compared. Some conclusions have been drawn: the excavation affection on metro tunnels mainly reflects in horizontal deformation of the nearer tunnel, which can be determined as the control and early-warning index for tunnel deformation; the proposed 5 control measures can reduce the deformation of metro tunnels, and the control effect of excavation-depth reduction or outside dewatering measure are the most apparent; the composite analysis is carried out to select the appropriate construction control scheme, considering the actual conditions. Metro tunnels in the operation stage are very strict in the deformation restriction. Therefore, some assistant measures such as block excavation should be taken. References | Related Articles | Metrics

Highway & Railway Engineering

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Thermal Characteristics of Thermochromic Asphalt Pavement Based on FEM Wu Yuling 2015, 34(5): 40-43.  DOI: 10.3969/j.issn.1674-0696.2015.05.08 Abstract ( )   PDF (577KB) ( )   In order to study the influence of thermochromic materials on the pavement surface temperature characteristic.In this paper,FEM simulation is conducted to study the influence of thermochromic materials on the surface temperature of asphalt pavement.The results show that the surface temperature of asphalt pavement doped with thermochromic materials is significantly lower compared to that of conventional asphalt pavement.In the meanwhile,conventional asphalt pavement underwent higher magnitude of temperature variations compared with thermochromic asphalt pavement.The decreased surface temperature and lower heat flux of thermochromic pavement both contribute to better pavementperformance. References | Related Articles | Metrics

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Influence Factors of High Temperature Performance of Activated Coal Gangue Modified Asphalt Binder Xiong Rui, Yang Xiaokai, Yang Fa,Fang Jianhong,Xu Anhua,Sheng Yanping 2015, 34(5): 44-48.  DOI: 10.3969/j.issn.1674-0696.2015.05.09 Abstract ( )   PDF (488KB) ( )   Through the dynamic shear rheological tests (DSR), the high temperature rheological properties of activated coal gangue modified asphalt mortar with different filler-asphalt ratios (0.6，0.8，1.0，1.2，1.4) and different temperatures (64，70，76，82 ℃) were investigated, and the results were compared with those of mineral powder modified asphalt mortar. Then, the grey entropy was applied to analyze the significance of influencing factors of the high temperature of activated coal gangue modified asphalt mortar such as temperature, active ingredient content of SiO2, filler-asphalt ratio, kinematic viscosity at 135 ℃ and softening point of asphalt mortar. The test results show that the activated coal gangue instead of mineral powder as the filler can make the high temperature performance of asphalt mortar greatly increase. Filler-asphalt ratio has the most obvious significance to the high temperature performance of activated coal gangue modified asphalt mortar. References | Related Articles | Metrics

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Adhesion Performance of Crushed Gravel and Asphalt Wang Ruilin, Zhou Weifeng, Liu Wei 2015, 34(5): 49-52.  DOI: 10.3969/j.issn.1674-0696.2015.05.10 Abstract ( )   PDF (413KB) ( )   For the effective use of Xinjiang crushed gravel, the water stability evaluation methods of broken gravel were studied, through the adhesion test, immersion Marshall Test and freeze thaw split test of Xinjiang crushed gravel. Based on the surface free energy theory, the free energy changes of the bonding among crushed gravel, asphalt and water were analyzed. The results show that the worst aggregate type of broken gravel adhesion performance can be used to represent the overall adhesion performance; according to the surface free energy theory, the adoption of the absolute value of the ratio of free energy can effectively and quantitatively analyze the reduce degree of free energy of bond among gravel, asphalt and water. The calculation method of free energy absolute value ratio for crushed gravel was proposed. References | Related Articles | Metrics

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Study on Anchor Reinforce Calculation Method for the Suspended Reinforced Concrete Road Slab Li Haizhan，Tang Hongmei，Li Xiaoming 2015, 34(5): 53-57.  DOI: 10.3969/j.issn.1674-0696.2015.05.11 Abstract ( )   PDF (746KB) ( )   Aiming at the water ruin disaster of the suspended reinforced concrete road slab,the anchor reinforced method for the suspended reinforced concrete road slab was proposed, which was composed of three parts, i.e., anchor stress rope, buttress and anchor rope. The calculation formulas of bending moment, the maximum width permitted and the anchoring wire cable tension force of the suspended reinforced concrete slab were established. Engineering case studies show that the method of reinforced concrete pavement slab established has strong practicability, which can realize emergency repair of the suspended reinforced concrete slab disasters. References | Related Articles | Metrics