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Kou L.,Tongji University | Pan F.,Anhui Xinhua University | Wang C.,Anhui Communications Consulting and Design Institute
Advanced Materials Research

Based on the research results of the microstructure of concrete, and considering the characteristics of rubber modified concrete, this paper proposed an analysis model of the microstructure of rubber modified concrete. According to the analysis model, comparing the influence of incorporation of rubber particles, no incorporation of rubber particles on the mechanical properties of concrete, the analysis result was in good accord with the experimental results, which confirmed the correctness of analysis model, then the mechanical properties of rubber modified concrete were analyzed. © (2011) Trans Tech Publications, Switzerland. Source

Lu J.,Nanjing Southeast University | Sun X.,Nanjing Southeast University | Dai Y.,Anhui Communications Consulting and Design Institute
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition)

The regression models between the average speed, 15th percentile speed, 85th percentile speed and 6 factors, the number of the lanes, the value of the speed limit, the position of the lanes, the vehicle type, the road saturation and the proportion of the large vehicle, are established by the multiple linear regression, respectively. Then, the speed selection model is built by the Logistic regression. The analysis results show that for the two-way six lanes, the minimum speed limit of the passing lane can be controlled according to the 15th percentile speed, and the maximum speed limit can adopt the variable speed limit, the speed limit for different lanes and the speed limit by types of vehicles according to the 85th percentile speed. The large vehicles in the kerb lane often select low speed driving when the saturation is high, while the small vehicles in the two-way two (or four) lanes often select high speed driving when the saturation is low. Different speed limit facilities are set according to the probability of selecting high speed driving. These two regression models can be used to figure out the 15th percentile speed, the 85th percentile speed and the probability of selecting low or high speed driving under specific road conditions, providing a basis in choosing the speed limits and the corresponding facilities for ordinary roads. Source

Ma Y.,Nanjing Southeast University | Xi J.,Anhui Communications Consulting and Design Institute | Ye J.-S.,Nanjing Southeast University | Yu B.,Jiangxi Traffic Science Research Institute
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport

In order to investigate the calculation method of internal force suitable for highway concrete U-shaped girder, with the concrete U-shaped girder being considered as an elastic rectangular thin plate with edge beams, considering the flexure and torsion of edge beams, using the reciprocal theory of works, the equation of deflectional surface was derived, and then the expressions of moment and deflection of deck were derived, and the appropriate calculation method of flexural rigidity and torsional rigidity was also put forward. A full scale model beam for test was calculated with this method, and the bending moments of deck with different beam height under wheel load were calculated and analyzed with finite strip method, the theory of plate and the beam theory. The results show that the theory of plate can be used to calculate the bending moment and deflection under wheel load accurately and can better reflect the influence on internal force induced by cross section differences, and the loading features of the whole structure, compared with the beam theory. Source

Liang Q.,Anhui Communications Consulting and Design Institute
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering)

As a few extroversion CFST arch bridge with single rib in China, Zhangjiang Bridge is taken as an example to calculate natural frequencies and mode shapes by establishing a spatial FEA model of ANSYS software. And the influences of central concrete grade of main arch rib, outward angle of balance arch, form of flying shore and raking shore and the jointing stiffness of arch rib and deck on dynamic characteristics of mian arch are researched. The results have certain reference value for other same bridges. Source

Sun S.-L.,Hohai University | Tang J.,Hohai University | Tang J.,Anhui Communications Consulting and Design Institute | Zheng Q.-H.,Hohai University | And 5 more authors.
Yantu Lixue/Rock and Soil Mechanics

Granulated blast furnace slag (GBFS) is utilized to overcome or to limit the expansion of an expansive soil sample. GBFS is added to sample in proportions of 10%-20% by weight. The test studies of swelling-shrinkage and basic physico-mechanical characteristics of soil samples are taken, so as to determine the improvement effects. Compared with unmodified sample, the free swelling ratio, liquid limit and plastic index decrease obviously; and the particle size gradation, strength characteristics and hydrated properties of the treated expansive soil are improved by a wide range. After improvement, clay content decreases, while silt content increases. The change of dry density with water content decreases and the hydrated property of modified soil is enhanced. It is shown that adding GBFS can successfully improve the expansive soil. Source

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