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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) | Year: 2012

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.

Sun S.-L.,Hohai University | Zheng Q.-H.,Hohai University | Zheng Q.-H.,China Power Engineering Consulting Group Corporation | Tang J.,Hohai University | And 5 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2012

By laboratory test, the potential use and effectiveness of soda residue as an additive for improving expansive soil are evaluated. The tests research the features of the basic physico-mechanical properties and expansibility of soda residues treated soil. The result shows that the increase of blending residue ratio has made the viscous composition decreased while the percentage of coarse granule increases so that the plasticity index, liquid limit, relative density, free swell index, load swell index are reduced significantly with the increase of soda residue. The test indicates that the soda residue has significant impact on the improvement of the expansibility of expansive soil. The range of compaction water content for soda residues treated soil is larger than expansive soil's. It brings great convenience for the construction of soda residues treated soil roadbed. After 7 days conservation, there is a remarkable increase in unconfined compression strength and shear strength. Furthermore, a peak appears when the blending ratio of residue has come up to 30%. The remarkable increase in cohesion reflects the shear strength enhancement. However, the angle of internal friction changes little.

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 | Year: 2012

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.

Yu F.,CAS Wuhan Institute of Rock and Soil Mechanics | Chen S.,CAS Wuhan Institute of Rock and Soil Mechanics | Chen X.,Anhui Communications Consulting and Design Institute | Zhang S.,Anhui Communications Consulting and Design Institute | Wang F.,Anhui Communications Consulting and Design Institute
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2013

The permeable tunnel with ribbed arch beam, which is a new type of tunnel structure, is analyzed. The geological environmental conditions and structural characteristics of this tunnel are expounded; and the concept of the design load standard for which the relaxation of the pressure caused by the surrounding rock failure in the limit state for this kind of non-symmetric half-dark tunnel structure is presented. By the numerical simulation study of the pattern and scope of tunnel surrounding rock failure, the basic failure modes of this tunnel can be concluded as which the vault slope rock slip along a ramp through the arch of the foot to form a wedge, and the size of the angle between the sliding failure surface and the horizontal plane determine the range of surrounding rock failure. On this basis, the structural load design and calculation model of the permeability tunnel with ribbed arch beam is established with theoretical analysis of the derivation, and compared and analyzed with the actual monitoring data and the numerical simulation results of construction conditions. The results show that the calculated internal forces distribution of this model can better reflects the variation of the internal force of tunnel structure, have a reliable safety margin, so as to provide a practical and effective design calculation method for the same type of half-dark tunnel structure section design and evaluation of long-term stability.

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 | Year: 2012

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.

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) | Year: 2012

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.

Hu B.,Wuhan University | Wang X.-G.,Wuhan University | Feng X.-L.,Wuhan University | Feng X.-L.,Wuhan Fengda Geological Engineering Ltd. | And 2 more authors.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2014

A deep excavation project of Wuhan Metro is taken as the research background, and several methods such as site monitoring, BP neural network prediction and numerical simulation are combined to investigate the deformation rules of the support structure of metro station in a complex road section and the effect of deep foundation pit excavation on overpass viaduct piers. In this study, the numerical simulation method is proposed to be used for dynamic rehearsal of engineering construction in similar future projects so as to verify the safety and economical efficiency of design schemes of excavations; meanwhile, dynamic prediction can be realized via BP neural network during construction to know the deformation trend at the next stage of such construction so as to establish informationization construction monitoring schemes combining " simulation and prediction" and to achieve safe and economical construction.

Kou L.,Tongji University | Pan F.,Anhui Xinhua University | Wang C.,Anhui Communications Consulting and Design Institute
Advanced Materials Research | Year: 2011

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.

Pan F.,Anhui Xinhua University | Kou L.,Tongji University | Wang C.,Anhui Communications Consulting and Design Institute
Advanced Materials Research | Year: 2012

Steel-timber combined member is a new kind of structural member composed of steel core and timber facing with bolt joint.This paper established the finite element analysis models of cantilever beam, and the finite element models were analyzed by the finite element package ANSYS considering the material and geometrically nonlinear.The results were compared with experimental results.Good mechanical properties were verified with comparison between data abtained from the test and calculated results. © (2012) Trans Tech Publications, Switzerland.

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