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20 June 2015, Volume 34 Issue 3 Previous Issue    Next Issue

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Research on Vehicle-Bridge Coupling Vibration of Self-Anchored Suspension Bridge with Single-Tower Li Hongquan, Zhao Mingshuai, Chen Yanjiang 2015, 34(3): 1-6.  DOI: 10.3969/j.issn.1674-0696.2015.03.01 Abstract ( )   PDF (923KB) ( )   Based on separated iterative algorithm of ANSYS and MATLAB, the motion equations of the vehicle and the bridge which were regarded as two separated subsystems were derived by virtual work principle and finite element method respectively. The displacement coordination condition and force balance relation at contact point were taken into consideration, in order to study the responses of self-anchored suspension bridge with single-tower under various road roughness, vehicle speed and bridge damping. Results indicate grade of road roughness has great influence on dynamic response of bridge. The impact factor behaves wavelike at different speeds. With increase of damping, the response tends to diminish in little degree. In addition, impact factor in current specification tends to be unsafe for structure design of this type of bridge. It is advised that the impact factor of suspension bridge should be regulated separately, considering the effects of road roughness and speed. References | Related Articles | Metrics

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Vehicle-Bridge Coupled Vibration Model of Straddle Type Monorail Considering with Cornering Characteristics Liu Yuyu, Wang Yonghu 2015, 34(3): 7-11.  DOI: 10.3969/j.issn.1674-0696.2015.03.02 Abstract ( )   PDF (786KB) ( )   In order to study the interaction between vehicle and straddle type monorail beam, a simply-supported PC track beam of straddle type monorail line in Chongqing was taken as the research object to establish the coupled vibration model. Each car in the monorail train was idealized as a dynamic system of 15-degrees-of-freedom. The cornering characteristics of the tires were taken into consideration. Vehicle’s differential equations were derived by using Lagrange formulation. The track beam was idealized as Euler beam and its differential equations were derived by using modal synthesis method. The dynamic responses of the coupled system were studied at different running velocities, which were compared with the field-test data and the results of the model which has no cornering characteristics. The results show that a proper correlation is found and the model which considers cornering characteristics gives a more actual result. The cornering characteristics can be ignored when studying the vertical coupled vibration problem and should be taken into consideration when studying the lateral problem. References | Related Articles | Metrics

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Numerical Analysis on Vibration Characteristics of Elevated Box Girders in Urban Mass Transit Zhang Renwei, Wei Hongliang 2015, 34(3): 12-15.  DOI: 10.3969/j.issn.1674-0696.2015.03.03 Abstract ( )   PDF (731KB) ( )   In order to study the vibration response of the elevated box girders in urban mass transit subjected to the train, 3D vibration model of simply supported girder was established by FEM. Thus the dynamic response of the box girder can be obtained, with the train running at a velocity of 60, 80, 100 and 120 km/h. The modal analysis results show that mode shapes of which natural frequencies is higher than 10 Hz present a deformation in section, and the vibration pattern of box girder appears as the bending vibration of composed plate element gradually. The time domain analysis result shows that when the train passes, the distribution of vibration appears as a phenomenon that the acceleration amplitude of flange is the largest, the one of web is the second, and the one of deck and bottom plate is the smallest in all. The vibration levels of rail, slab, deck, flange, web and bottom plate range of 140~160, 110~120, 110~120, 115~130, 110~125 and 105~115 dB respectively, and increase with the improvement of train speed. References | Related Articles | Metrics

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Crack Width Calculation Method of Ribbed Steel-Concrete Composite Beam Wang Xiaodong,Wei Wenlong, Tang Liang 2015, 34(3): 16-20.  DOI: 10.3969/j.issn.1674-0696.2015.03.04 Abstract ( )   PDF (530KB) ( )   Referring to the bond-slip theory of reinforced concrete cracks calculation method, crack spacing formula of the rectangular Ribbed Steel-Concrete Composite beam (RSCC beam and strain formula of the top of stiffen plate were developed. The formulas explain the phenomena: the crack spacing of RSCC beam is smaller than that of ordinary reinforced concrete beams in the experiment. Referring to the calculation of ordinary reinforced concrete cracks comprehensive theory, the formula for calculating the maximum crack width of RSCC beam was derived. References | Related Articles | Metrics

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Experimental Study on Shear Performance of Embedded Steel Plate and Concrete Interface Fan Liang, He Jun 2015, 34(3): 21-25.  DOI: 10.3969/j.issn.1674-0696.2015.03.05 Abstract ( )   PDF (694KB) ( )   The shearing capacity and shear-slip relation of steel plate-concrete interface are important bases for the whole process analysis of steel-concrete composite structure. On the basis of a typical shear-slip constitutive model of shear connector, a slip constitutive model of embedded steel plate-concrete interface was established. Shearing test with 21 samples was conducted, thus, concrete strength and typical viscous slip curves of embedded steel plate and concrete interface were fitted in terms of different steel plate areas and roughness. And shear capacity formula of embedded steel plate and concrete interface was established. Besides, slip constitutive equation factors of embedded steel plate-concrete interface were determined. Results show that embedded steel plate and concrete interface shear capacity is weaker than that of tube concrete and steel reinforced concrete. References | Related Articles | Metrics

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Study on Disease Mechanical Simulation of Highway Tunnel Lining Liu Xingen, Liu Xuezeng, Qi Lei, Zhou Decheng, Peng Dan 2015, 34(3): 26-31.  DOI: 10.3969/j.issn.1674-0696.2015.03.06 Abstract ( )   PDF (657KB) ( )   Base on the theoretical calculation of load structure method on tunnel, the mechanical simulation model of the highway tunnel lining disease which included cracks, material degradation, voids, additional load and others was established. The highway tunnel lining damage mechanics simulation software was developed, in order to evaluate the bearing capacity of lining diseases. A case of history calculation shows that cracks and voids of lining will reduce the safety factor structure, and the safety factor of the structure within the affected area is relatively stable, and as the distance from the position of the disease becoming large, its impact weakens gradually. References | Related Articles | Metrics

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GPR for Detecting Karst-Fissure Aquifer in Tunnel Zhao Ningyu, Pan Jinqiu, Yu Haijun, Liang Bo 2015, 34(3): 32-35.  DOI: 10.3969/j.issn.1674-0696.2015.03.07 Abstract ( )   PDF (815KB) ( )   The geological development principles of karst-fissure aquifer were analyzed. Then the characteristics of GPR electromagnetic reflection signal on karst-fissure aquifer and water content estimation method based on wave velocity-dielectric constant relationship were studied. Through specific engineering application, the geological radar has good resolution to fracture water buried in low water content rock and in fractured rock environments. And the estimation method of Karst fissure water moisture is feasible. The validity of the signal analysis method based on the geological understanding of the law to delineate adverse geological of karst fissure water and to estimate water content was verified. References | Related Articles | Metrics

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Optimized Design of Asphalt Pavement Based on Pavement Skid Resistance Performance Liu Qinkun, Chen De, Ye Zhongchen, Guan Fuyang 2015, 34(3): 42-46.  DOI: 10.3969/j.issn.1674-0696.2015.03.09 Abstract ( )   PDF (567KB) ( )   The existing asphalt pavement design methods only use the structural parameters as design parameters without considering surface performance. A series of asphalt pavement types, including coarse and fine gradations, were chosen to test their texture and friction using different texture (i.e. Sand Patch Testing and Laser Texture Tester) and friction testing methods (i.e. British Pendulum Tester and Dynamic Friction Tester). At the same time, the mixture samples, with same design parameters, were compacted with Superpave Compactor Method and tested with the same testing methods. Based on those testing results, the relationships between different testing methods, compaction methods, design parameters and macro-texture and skid resistance were obtained. The results show that there are a good correlation between macro-texture, skid resistance and the MTD. Meanwhile, a model to predict the skid resistance of asphalt pavement using the design parameters was built. It can be used in asphalt pavement design basing on skid resistance performance. References | Related Articles | Metrics

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Research on Ageing Process and Mechanism of Heat-Reflective Coating of Asphalt Pavement Tang Boming, Yuan Ying, Cao Xuejuan, Tian Chunling, Yu Miao 2015, 34(3): 47-51.  DOI: 10.3969/j.issn.1674-0696.2015.03.10 Abstract ( )   PDF (616KB) ( )   The heat-reflective coating for asphalt pavement is subject to ageing processes which affect its cooling performance. The aging laws and mechanism of heat-reflective coating were surveyed. The methods used in the study are known as natural aging test, surface observation, FTIR , reflectivity measurement, cooling performance test. The results of the experiment indicate that one of the key factors on ageing is the quantity of solar irradiation. In addition, the heat-reflective coating aged with carbon-carbon double bond cleavage and carbon-oxygen double bond formation which can cause the reduction of reflectivity. Also, there are some correlation between reflectivity and cooling performance and both of them decreased with aging time. References | Related Articles | Metrics

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Laboratory Test Study of Cement Emulsified-Asphalt Mixture Performance Based on Emulsifier Complex Technology Xiao Jingjing, Li Zhihan, Sha Aimin, Jiang Wei, Wang Zhenjun 2015, 34(3): 52-56.  DOI: 10.3969/j.issn.1674-0696.2015.03.11 Abstract ( )   PDF (770KB) ( )   Through laboratory test and microscopic concept analysis means such as scanning electron microscope, the demulsification speed’s influence law on cement emulsified-asphalt mixture’s construction performance and pavement performance of different emulsifier complex scheme were studied to reveal the mixture’s strength formation mechanism. The results show too fast or too slow demulsification speed is not conducive to mixture’s pavement performance. The two different emulsifiers MQK-1M and SBT were remixed with the scheme of 0.8%+1.0% to produce emulsion. And the mixture which used this emulsion possessed good construction performance, mechanical performance and pavement performance. And this mixture can be used for the pavement’s mid-layer, lower layer and flexible base. References | Related Articles | Metrics

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Local Scour Depth Calculation of Roadbed along River Causing by Snowmelt Disasters in Xinjiang Wu Guoxiong, Wang Tao, Zhou Yu,Yu Miao 2015, 34(3): 57-62.  DOI: 10.3969/j.issn.1674-0696.2015.03.12 Abstract ( )   PDF (761KB) ( )   Xinjiang mountain watershed was taken as the object of the research. On the foundation of exactly estimating the max snowflow discharge, the influence factors of structures along the river embankment in the aspect of water flow characteristics, scour mechanism and scour depth and scope near the junction were analyzed. Indoor lab experiments were carried out to simulate the scour. Firstly, the relationship between each influence factor and the slop erosion depth was found out. Then the slop erosion under different flow quantity, flow rate, water depth, hill slop gradients, side slope gradient, subgrade depth and sand particle size were simulated. Finally the maximum erosion depth was gained by the above lab results and theoretical analysis, and its validity was checked. References | Related Articles | Metrics

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Experimental Research on Cracking Rules and Influence Factors of Compacted Expansion Soil Wei Bingxu, Gao Bing, Huang Zhen，Li Zhengfu 2015, 34(3): 63-66.  DOI: 10.3969/j.issn.1674-0696.2015.03.13